rev 2 to 'cable derating in conduits w/fire barrier coatings.' · derating factors...

St. Lucie Units 1 and 2Docket Nos. 50-335 and 50-389L-98-175 Attachment 3

Page i

'Calculation No:

Title:

0

Revision for NRC GL 92-08RAI¹2

Revision for Heat Load

INITIALISSUE

ol -I4-98

12-17-96

8-12-96

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12-17-96

8-12-96

oro-~r .I1 2-18-96

8-14-96

No. Descri tion Date

REVISIONS

Chkd Date A r Date

980b300530 980b2bPDR ADQCK 05000335P PDR ampcalc.05/98

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1.0 Purpose

2.0 References

2.0 References

2.0 References

2.0 References

2.0 References

2.0 References

2.0 References

2.0 Reference

3.0 Methodology

3.0 Methodology

3.0 Methodology

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5.0 Calculation

5.0 Calculation

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5.0 Calculation

6.0 Results

6.0 Results

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ampcalc.05/98

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CALCULATIONNUMBER REV.

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2.0

3 .0

4.0

5.0

6.0

Cover Sheet

List of Effective Pages

Table of Contents

Purpose/Scope

References

Methodology

Assumptions/Bases

Calculation

Results

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ICEA Pub. No. S-66-524 5. NEMA Std WC7-88,Excerpt Table 2-4 5 6-1

NUCON International, Inc.,"Pyrolysis Gas Chromatography Analysis of 9Thermo-Lag Fire Barrier Samples",P.O. No. LJ950 WP-006, 12 May 1995

NUCLEAR REGULATORY COMMISSION "SECONDREQUEST FOR ADDITIONALINFORMATION - GENERICLETTER 92-08, "THERMO-LAG 330-1 FIRE BARRIERS",ST. LUCIE PLANT, UNIT 1 AND 2, AND TURKEY POINTPLANT, UNIT 3 AND 4 (TAC NO. M82809)

ampcalc.05/98

CALCULATIONNO. REV. SHEET NO. ~

1.0 ELIBEQSE

The purpose of this calculation is to determine or update ampacity values for power cables routed inSt. Lucie Unit 1 and Unit 2 conduits wrapped with Thermo-Lag fire barrier systems as listed in previouscalculations (Ref. 2.3). This document outlines the methodology used to determine power cableampacity including derating factors. Wrapped conduit derating factors are determined for existing firebarriers and for upgraded systems.

Existing cable protection will be upgraded on certain conduits to maintain required levels of protection.The cables in the conduits have been evaluated to require protection because no redundant functionsor alternate conduit routes exist to eliminate the need for protection (Ref. 2.76 -2.88). By performingan evaluation with upgraded conduit wrap, cable ampacity margins may be verified to ensure adequatecapabilities exist for providing power to affected electrical loads.

Revision 1 to this calculation adds a discussion of the operating heat loads (Watts per foot) for thewrapped cables and a comparison of the cables at St. Lucie plant to the cables tested at OmegaLaboratories for Texas Utilities'omanche Peak Plant (Ref. 2.26). Heat load factors provide anadditional assurance that cables installed at St. Lucie are enveloped by the test configuration.

Revision 2 of this calculation changes the cable tabulations for cable current carrying capacity basedon IEEE ambient conditions with 'No Sun - 0 Ft/s'elocity air flow (Ref. 2.75) and to enhance thecalculation in response to NRC questions from the Sandia National Laboratories'eview to clarifyexisting assumptions and inputs (Ref. 2.105). Engineering reviewed the ampacity derating testsperformed by Underwriters Laboratories for Florida Power Corporation (FPC) for Crystal River NuclearStation (Ref. 2.109) as recommended by the NRC to determine applicability to St. Lucie Plant. FPCinstalled upgrades to Thermo-Lag fire barriers using Mecatiss fire barrier systems. This is notapplicable to St. Lucie installations; however, the initial/baseline fire tests provide information onexisting Thermo-Lag fire barriers.

The FPC testing concluded that for one (1) inch conduit, installation of Thermo-Lag 3-hour fire barriersincreased the current carrying capacity of affected cables; i.e., Ampacity Derating Factor (ADF) of4.26% and Ampacity Correction Factor (ACF) of 1.04. For four (4) inch conduit, one hour Thermo-Lagfire barriers also increased the current capacity of affected cables; i.e., ADF of 3.31% and ACF of1.03%. Three hour fire barriers on four (4) inch conduit derated the current capacity of affectedcables; however, not to the degree that had been previously reported; i.e., ADF of 2.69% and ACF of0.973. Derating factors originally used for St. Lucie Plant cables are more conservative than thesevalues and are therefore bounded by the FPC testing.

Revision 0 and Revision 1 of this calculation listed all affected cables in protected conduits whetherthe cable provided power, control, low level signal or other function which was only intermittentlyenergized, such as valve power cables. Revision 2 removed the cables that do not requireconsideration of ampacity derating for continuous loading.

ampcalc. 05/98


2.0

2.1 Florida Power 5 Light Company, St. Lucie Plant Unit No. 1, Appendix "R" Safe ShutdownAnalysis, 8770-B-048, Revision 2.

2.2 Florida Power 5 Light Company, St. Lucie Plant Unit No. 2, Appendix "R" Safe ShutdownAnalysis, 2998-B-048, Revision 1.

2.3 FPL Calculation PSL-BFJE-93-002, Revision 1, "Ampacity Derating Response to NRC GL 92-08for Cable Routed in Conduits with Thermo-Lag 330-1 Fire Barrier System Coating"

FPL Calculation PSL-O-F-J-E-90-011, Revision 2, "Station Blackout Hot Standby Loads".

2.5 FPL Calculation PSL-O-F-J-E-90-012, Revision 1, "Station Blackout Cold Shutdown Loads".

2.6 FPL Calculation PSL-1-F-J-E-90-015, Revision 0, "Safety Related Batteries 1A and 1B".

2.7 FPL Calculation PSL-2-F-J-E-90-016, Revision 0, "Safety Related Batteries 2A and 2B".

2.8 FPL Calculation PSL-1-F-J-E-90-017, Revision 0, "Battery Chargers 'lA, IAA, 'IB, 1BB, 1ABKilowatt Input Demand".

2.9 FPL Calculation PSL-2-F-J-E-90-018, Revision 0, "Battery Chargers 2A, 2AA, 2B, 2BB, 2ABKilowatt Input Demand".

2.10 FPL Calculation PSL-2-F-J-E-90-019, Revision 0, "Unit 2 Battery Chargers 2A, 2AA, 2B, 2BBand 2AB Sizing".

2.11 FPL Calculation PSL-2-FJE-90-020, Revision 4, "St. Lucie Unit 2 Emergency Diesel Generator2A and 2B Electrical Loads".

2.12 FPL Calculation PSL-2-F-J-E-90-025, Revision 0, "Evaluation of Calculation WHL-39, Rev. 0".

2.13 FPL Calculation PSL-2-FJE-90-028, Revision 1, "Unit 2 Low DC System Voltage Calculation".

2.14 FPL Calculation PSL-1-F-J-E-91-002, Revision 0, "Instrument Inverters 1A, 1B, 1C 5 1D ACOutput Loading".

2.15 FPL Calculation PSL-1-F-J-E-91-004, Revision 0, "Unit 1 High DC System Voltage Analysis".

2.16 FPL Calculation PSL2-FJE-91-007, Revision 0, "PSL2 - Comparison of Anticipated ElectricalLoading Conditions to Equipment Ratings".

2.17 FPL Evaluation JPN-PSL-SEMP-92-039, Revision 1, "Operability Assessment of Thermo-Lag330-1".

ampcalc.05/98

CALCULATIONNO. REV. SHEET NO ~

2.0 (cont'd)

2.18 FPL Calculation PSL-2FJE-93-001, Revision 1, "St. Lucie - Unit 2 Short Circuit, Voltage Dropand PSB-1 Analysis Calculation."

2.19 FPL Calculation PSL-OFJE-93-004, Revision 0, "St. Lucie Station Blackout Emergency DieselGenerator Transient Analysis".

2.20 FPL Calculation PTN-BFJM-96-005, Revision 0, "Fire Barrier Ampacity Correction Factors-Extrapolation of Test Results for 3 Hour Barrier".

2.21 EBASCO Services, Incorporated, Calculation EC-100, Revision 1, "Fire Wrapped Conduits CableAmpacity Document for St. Lucie Units 1 and 2".

2.22 EBASCO Services, Incorporated, Calculation EC-192, Revision 2, "MOVTOL Heater SelectionCalculation".

i

2.23 EBASCO Services, Incorporated, Calculation WHL-8, Revision 7, "Power Cable AmpacityDocument for St. Lucie ¹2".

2.24 EBASCO Services, Incorporated, Calculation WHL-25, Revision 2, "Instrument Inverters ACOutput Loading".

2.25 Industrial Testing Laboratories (ITL) Report No. 84-10-5, Dated October, 1984, "Ampacity Testfor 600 Volt Power Cables Installed in a Five Foot Length of Two Inch Conduit Protected withThree Hour Fire Rated Design of Thermo-Lag 330-1 Fire Barrier System."

2.26 Omega Point Laboratories, "Ampacity Derating of Fire Protected Cables", Project No. 12340-94583,95165-95168,95246, Electrical Test to Determine the Ampacity Derating of a ProtectiveEnvelope for Class 1E Electrical Circuits, dated March 19, 1993; Prepared for: TU Electric-Comanche Peak Steam Electric Station.

2.27 Florida Power & Light Company, St. Lucie Plarit Unit 1, Drawing 8770-G-366, Revision 34,Reactor Containment Bldg El. 45'-0 Conduit, Trays & Grounding Plans.

2.28 Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-375, Sheet 1, Revision22, Reactor Containment Bldg Penetration Details.

2.29 Florida Power &. Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-390, Revision 20,Reactor Auxiliary Building El -0.50'onduit, Trays and Grounding Sh. 1.

2.30 Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-391, Revision 27,Reactor Auxiliary Bldg El -0.50'onduit, Trays & Grounding-Sh. 2.

2.31 Florida Power & Light Company, St. Lucia Plant Unit 1, Drawing 8770-G-392, Revision 35,Reactor Auxiliary Building El. 19'-6 Conduit, Trays & Grounding - Sh. 1.

ampcalc.05/98


2.0 (cont'd)

2.32 Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-393, Revision 30,Reactor Auxiliary Building El. 19'-6 Conduit, Trays & Grounding - Sh. 2.

2.33 Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-395, Revision 20,Reactor Auxiliary Building, El. 43'-0, 62'-0 Conduit, Trays & Grounding.

2.34

2.35

Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-424 S01, Revision 6,Fire Protection Reactor Auxiliary Building El -0.50'.

Florida Power & Light Company, St. Lucie Plant Unit 1', Drawing 8770-G-424 S02, Revision 7,Fire Protection Reactor Auxiliary Building El. 19.50'.

2.36 Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-424 S03, Revision 7,Fire Protection Reactor Auxiliary Building El. 43.00'.

2.37

2.38

Florida Power & Light Company, St. Lucie Plant Unit 1, Drawing 8770-G-424 S04, Revision 4,Fire Protection Reactor Auxiliary Building El. 19.50'nd El. 43.00'.

11

Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-366, Revision 14,Reactor Containment Bldg. El. 45'-0 Conduit, Trays & Grounding Plan.

2.39 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-375, Sheet 1, Revision13, Reactor Containment Bldg. Penetration Details.

2.40 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-390, Revision 16,Reactor Auxiliary Building El. (-)0.50' Conduit, Trays & Grounding Sh. 1.

2 41 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-391, Revision 17,Reactor Auxiliary Building El. (-)0.50' Conduit, Trays & Grounding Sh. 2.

2.42 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-392, Revision 15,Reactor Auxiliary Building El. 19'-6 Conduit Trays & Grounding-Sh. 1.

2.43 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-393, Revision 14,Reactor Auxiliary Building El. 19'-6 Conduit, Tray & Grounding-Sh. 2.

2.44 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-395, Revision 14,Reactor Auxiliary Building El. 43'-0, 62'-0 Conduit, Trays & Grounding Sh. 2.

2.45 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 2, Revision4, RAB El. 19.50'onduit Layout.

anpcnlc.05/98

i2.0

CALCULATlONNO.

(cont'd)

REV. SHEET NO. ~

2.46 Florida Power 5. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 3, Revision4, RAB El. 19.50'onduit Layout.

2.47 Florida Power 5. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 4, Revision4, RAB El. 19.50'onduit Layout

2.48 Florida Power &. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 6J,Revision 1, R.A.B. and R.C.B. Appendix 'R'rapped Conduit Summary.

2.49 Florida Power 5 Light Company, St. Lucie Plant Unit 2,'Drawing 2998-G-411, Sheet 7, Revision7, RAB El. 19.50'onduit Layout.

2.50 Florida Power 5. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 8, Revision5, RAB EI. 19.50'onduit Layout.

2.51 Florida Power 5 Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 9, Revision5, RAB El. 19.50'onduit Layout.

2.52 Florida Power 5. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 10,Revision 4, RAB El. 19.50'onduit Layout.

2.53 Florida Power 5 Light Company, St. Lucia Plant Unit 2, Drawing 2998-G-411, Sheet 13,Revision 3, RAB El. 19.50'onduit Layout.

2.54 Florida Power 8c Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 14,Revision 5, RAB El. 19.50'onduit Layout.

2.55 Florida Power 5. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 15,Revision 3, RAB El. 19.50'onduit Layout.

2.56 Florida Power 5 Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 16,Revision 2, RAB El. 19.50'onduit Layout Sh. 16.

2.57 Florida Power 8c Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 17,Revision 3, RAB El. 19.50'onduit Layout Sh. 17.

2.58 Florida Power 5 Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 18,Revision 2, RAB fl. 19.50'onduit Layout Sh. 18.

2.59 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 19,Revision 4, RAB El. 19.50'onduit Layout Sh. 19.

ampcalc.05/98


2.0 (cont'd)

2.60 Florida Power &. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 20,Revision 7, Reactor Auxiliary Building Electrical Penetration Area Conduit Layout Sh. 20.

2.61 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 22,Revision 9, RAB El. 43.00'onduit Layout.

2.62 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 23,Revision 6, RAB El. 43.00'onduit Layout Sh. 23.

2.63 Florida Power &. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 29,Revision 9, RAB El. 43.00'onduit Layout Sh. 29.


2.65 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 34,Revision 12, Reactor Auxiliary Building El. 43.00'onduit Layout Sh. 34.

2.66 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 35,Revision 9, RAB El. 43.00 Conduit Layout.

2.67 Florida Power 8c Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 36,Revision 7, Reactor Auxiliary Building El. 43.00'onduit Layout Sh. 36.

2.68 Florida Power & Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 37,Revision 6, Reactor Auxiliary Building El. 43.00'onduit Layout Sh. 37.

2.69 Florida Power &. Light Company, St. Lucie Plant Unit 2, Drawing 2998-G-411, Sheet 38,Revision 7, Reactor Auxiliary Building El. 43.00'onduit Layout Sh. 38.


2.71 Florida Power & Light Company, St. Lucie Plant Unit 1, Cable and Conduit Lists, 8770-A-328.

2.72 Florida Power & Light Company, St. Lucie Plant Unit 2, Cable and Conduit Lists, 2998-A-328.

2.73 Florida Power &. Light Company, St. Lucie Plant Unit No. 1, Control Wiring Diagrams (CWD),8770-B-327 series.

2.74 Florida Power &. Light Company, St. Lucie Plant Unit No. 2, Control Wiring Diagrams (CWD),2998-B-327 series.

anpcnlc.05/98


2.0 (cont'd)

2.75 IEEE Standard Power Cable Ampacity Tables, IEEE Std. 835-1994, Approved Date September22, 1994.

2.76 Engineering Evaluation St. Lucie Unit 1, JPN-PSL-SEMP-94-052, "Review of Appendix'R'ualificationof Thermo-Lag Protected Conduits in Fire Area A."

2.77 Engineering Evaluation St. Lucie Unit 1, JPN-PSL-SEMP-94-053, "Review of Thermo-LagProtected Conduits in Fire Area 8."

2.78 Engineering Evaluation St. Lucie Unit 1, JPN-PSL-SEMP-94-054, "Review of Thermo-LagProtected Conduits in Fire Area C."

2.79 Engineering Evaluation St. Lucie Unit 1, JPN-PSL-SEMP-94-055, "Review of AppendixR'ualificationof Thermo-Lag Protected Conduits in Fire Area E."

2.80 Engineering Evaluation St. Lucie Unit 1, JPN-PSL-SEMP-94-056, "Review of Thermo-LagProtected Conduits in Fire Area N."

2.81 Engineering Evaluation St. Lucie Unit 1, JPN-PSL-SEMP-94-064, "Review of Thermo-LagProtected Conduits in Fire Area O."

2.82 Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-057, "Review of Appendix'R'ualificationof Thermo-Lag Protected Conduits in Fire Area A."

2.83 Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-058, "Review of Appendix'R'ualificationof Thermo-Lag Protected Conduits in Fire Area B."

2.84 Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-059,Qualification of Thermo-Lag Protected Conduits in Fire Area C."

"Review of Appendix

'R'.85

Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-060, "Review of Appendix'R'ualificationof Thermo-Lag Protected Conduits in Fire Area H."

2.86 Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-061, "Review of AppendixR'ualificationof Thermo-Lag Protected Conduits in Fire Area I."

2.87 Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-062, "Review of Appendix'R'ualificationof Thermo-Lag Protected Conduits in Fire Area M."

2.88 Engineering Evaluation St. Lucie Unit 2, JPN-PSL-SEMP-94-063, "Review of Appendix'R'ualificationof Thermo-Lag Protected Conduits in Fire Area O."

ampcalc. 05/98


2.0 (cont'd)

2.89 Standard Handbook for Electrical Engineers, 11th Edition.

2.90 Westinghouse Electric Corporation Drawing ¹9552D65, Sheet 3, "St. Lucie Unit No. 2 ElectricHydrogen Recombiner Solid State Power Controller Schem", EMDRAC No. 2998-3031, Revision1 ~

2.91 St. Lucie Unit No. 1, Cable & Conduit List 8770-B-328, Installation Notes, Sh. 12, Rev. 9.I

2.92 FPL St. Lucie Unit 1 Drawing 8770-G-275 Sh. 1, Revision 12, "6.9kV Swgr & 4.16kV SwgrOne Line Wiring Diagram Sh. 1".

2.93 FPL St. Lucie Unit 1 Drawing 8770-G-275 Sh.7, Revision 12, "480V Motor Control Centers OneLine Wiring Diagram Sh. 7".

2.94 FPL St. Lucie Unit 2 Drawing 2998-G-275 Sh. 18, Revision 5, "4.16kV Switchgear No. 2A3 and2B3 One Line Diagrams".

2.95 FPL St. Lucie Unit 2 Drawing 2998-G-275 Sh. 19, Revision 3, "4.16kV Switchgear No. 2AB,No. 2A4 and No. 2B4 One Line Diagrams".

2.96 FPL St. Lucie Unit 2 Drawing 2998-G-275 Sh. 35, Revision 8, "480V Motor Control Center No.2B5 (Sh. 1) One Line Diagram".

2.97 FPL St. Lucie Unit 2 Drawing 2998-G-275 Sh. 41, Revision 7, "480V Motor Control Center No.2B6 Sh. 2 One Line Diagram".

2.98 ICEA Publication No. S-19-81, NEMA Standards Publications No. WC3-1980, ApprovedSeptember 19, 1979, " Rubber-Insulated Wire and Cable for the Transmission and Distributionof Electrical Energy", Table 2-4.

2.99 ICEA Publication No. S-66-524, NEMA Standards Publication No. WC7-1988, " Cross-LinkedThermosetting-Polyethylene-Insulated Wire and Cable for the Transmission and Distribution ofElectrical Energy ".

2.100 ICEA Publication No. S-68-516, NEMA Standards Publication No. WC8-1988, " Ethylene-Propylene-Rubber-Insulated Wire and Cable for the Transmission and Distribution of ElectricalEnergy ".

2.101 Engineering Evaluation St. Lucie Units 1 & 2, JPN-PSL-SEEP-94-108, Revision 1, "Evaluationof Existing Thermo-Lag Fire Barriers"

ampcalc.05/98

'2.0

CALCULATIONNO.

(cont'd)

REV. SHEET NO. 0I

2.102 Engineering Evaluation JPN-PSL-SENP-95-030, "Response to NRC Request for AdditionalInformation Dated 12/28/94".

2.103 NUCON International, Inc., "Pyrolysis Gas Chromatography Analysis of 9 Thermo-Lag FireBarrier Samples, Performed for Florida Power 5 Light Company" (Attachment 2).

2.104 EPRI Power Plant Electrical Reference Series, Volume 4, "Wire and Cable", Section 4.4.

2.105 NRC Second Request for Additional Information - Generic Letter 92-08, "Thermo-Lag 330-1 FireBarriers", St. Lucie Plant, Units 1 and 2, and Turkey Point Plant, Units 3 and 4 (TAC No.M82809), Dated April 23, 1998.

2.106 NRC "SAFETY EVALUATION OF AMPACITY ISSUES RELATED TO THERMO-LAG FIREBARRIERS AT COMANCHE PEAK STEAM ELECTRIC STATION, UNIT 2 (TAC NO. M85999)", ToC. Lance Terry, Group Vice President, Nuclear TU Electric, Dated June 14, 1995.

2.107 NRC "CRYSTAL RIVER UNIT 3 - REQUEST FOR ADDITIONALINFORMATION REGARDINGTHERMO-LAG RELATED AMPACITYDERATING ISSUES (TAC NO. M91772)", To Mr. Roy A.Anderson, Senior Vice President, Nuclear Operations, Florida Power Corporation, Date May 22,1997.

2.108 FLORIDA POWER CORPORATION to U.S. Nuclear Regulatory Commission, "Response toRequest for Additional Information Regarding Thermo-Lag Related Ampacity Derating Issues",Dated July 3, 1997

2.109 NRC "SAFETY EVALUATIONADDRESSING THERMO-LAG RELATED AMPACITY DERATINGISSUES FOR CRYSTAL RIVER (TAC NO. M91772)", Dated November 14, 1997.

2.110 FPL Calculation PSL-BFSM-98-005, Revision 0, "ELECTRICAL AMPACITY CORRECTIONFACTORS FOR THERMO-LAG FIRE BARRIERS".

2.111 FPL Construction Specification MN-3.21, Revision 8, "INSTALLATIONAND INSPECTIONGUIDELINES FOR THERMO-LAG FIRE BARRIER MATERIAL".

mapcalc.05/98

CALCULATIONNO. REV. SHEET NO. ~3.0

3.1 Review the Appendix R Safe Shutdown Analysis (SSA) for cables identified as requiringprotection and conduits identified with fire barriers (Ref. 2.1 & 2.2).

3.2 Review Unit 1 Fire Protection drawings, 8770-G-424 S01, S02, S03 and S04 (Ref. 2.34 - 2.37)for conduits shown and listed as protected or shown as e protection not required by furtherevaluation. Fire barriers were installed on the e conduits prior to the re-evaluation whichremoved protection requirements (Ref. Table 5.2).

3.3

3.4

Review Unit 2 Appendix R wrapped summary drawing, 2998-G-411, Sheet 6J (Ref. 2.48) forconduits shown and listed as protected or shown as e protection not required by furtherevaluation. Fire barriers were installed on the e conduits prior to the re-evaluation whichremoved protection requirements (Ref. Table 5.3 5. 5.4).

f

Review Unit 2 raceway and conduit layout drawings for conduits wrapped with Thermo-Lag330-1 fire barriers for RG 1.75 separation (Ref 2.38-2.47, 2.49-2.70).

3.5 Identify cables in conduits covered with Thermo-Lag 330-1 fire barrier systems not previouslyidentified in SSAs; i.e., RG 1.75 and cables in conduits designated e.

3.6 Determine cable function from review of associated control wiring diagrams and compile listingsof power cables affected. Signal and control cables do not carry sufficient current to generateheat in the cable and reduce ampacity. Power cables to valves are excluded due to the shortduration of valve operation.

3.7 Review calculations issued by EBASCO, Services, Inc. and FPL Engineering to determine loadsand currents used for affected power cables. Select worst case loading from backgroundinformation and determine which loads will be applied to the cables continuously or longer thanthe time which will heat the cable from the load current (Ref. 2.3-2.16, 2.18-2.24).

3.8 For motors, determine kilovolt-amperes (KVA) rating from horsepower rating and then calculatecurrent based on line voltage (480 or 4160 volts) to device. Motor kilovolt-amp and efficienciesare discussed in Assumption 4.10 and 4.11.

3.9 Obtain derating factors for multiple power cable installed in the same conduit, the number ofcurrent carrying conductors in the conduit (C/C) and the Ampacity Correction Factor (ACF)calculated in PSL-BFSM-98-005 (Ref. 2.110) ~

3.9.1 The (C/C) derating factor adds a percentage based on the adverse effect of mutualinductance of energized current carrying conductors and the effects on other conductorswithin the same raceway. For conduits with more than three [3] energized'conductors,the mutual inductances cause the current to move away from other energizedconductors which creates inductive heating and losses within the conduit.

ampcalc. 05/98


3.9.2 In response to the NRC request for additional information (Ref. 2.105), a new fire barrierheat transfer calculation (Ref. 2.110) was created specifically for St. Lucie fire barrierinstallations. This calculation determines a new ACF based on fire barrier testingperformed for FPC Crystal River Station. This revised ACF was reviewed againstexisting ACF and added in Tables 5.5.a, 5.5.b and 5.5.c.

3.9.3 ICEA (Insulated Cable Engineers Association) cable data tables give ampacities [Ic ] forthree conductor (3/c) or triplex cables in a conduit in air. Revision 1 to this calculationused the cable ampacity for cables in conduit in free air with 'No Sun - 2 Ft/s'irvelocity based on operating conditions in the Reactor Auxiliary Buildings of St. Lucieplant. In response to NRC concerns in the 1998 RAI (Ref. 2.105), for Revision 2 thecurrent carrying capacity of individual cables was changed to 'No Sun - 0 Ft/s'irvelocity. This ambient condition is for cables installed indoors with no ventilation.Changing the ambient conditions reduced the cable current capacity a maximum of4.4% for size 00 [1/c ¹2/0 AWG].

The cable ampacities are derated when the number of conductors in a conduit exceeds three(3). Cable ampacity is multiplied by the following correction factor for inductive heating (Ref.2.104):

Total Number Ampacity CorrectionEarth M~arati~

34-67- 24

1.000.800.70

3.10 Calculate derated ampacity (I') for each power cable.

(I') = lc x (ACF) x (C/C Derating %)

3.11 Determine margin percent (%) between rated cable capacity and the derated ampacity (I'):

% Margin = ( DaratedMm~ - 1 ) x 100Load Amps Required(l„)

3.12 Operating heat loads (Watts per foot) are calculated as follows:

Watts/foot = ( ¹ of conductors) ( resistance per 1000 ft)(load current)~ /1000

The heat loads for the derated current load on a.,cable type is compared to the operatingheat load for the actual current load on a cable to assure cable design is not exceeded.

ampca lc. 05/98


3.13 Cable resistance values are given at a temperature of 25 'C. Table 6-1 (attached) providesthe following temperature conversion equation for copper conductors:

R1 = R2 (259.6/[234.5 + T2]);,where;

R2 = R1 ([234.5 + T2] /259.5)

R2 = R1 ([234 5 + 90] / 259.5) = R1 (1.2505)

R1 = resistance at 25 'CR2 = resistance at operating temperatureT2 = cable temperature; i.e., 90 'C

4.0

4.1 Fire protection wrap used at St. Lucie station is the Thermal Science, Inc. (TSI) Thermo-Lag FireBarrier System. Typically, the half-round "clamshell" covers applied over conduits have anominal thickness of 6/8" for one (1) hour ratings and one and one-quarter (1-/i) inch for three(3) hour ratings. Installation of all required fire barriers was reviewed and confirmed orupgraded to be installed per Construction Specification MN-3.21 (Ref. 2.'111).

4.2 The original design calculations for derating factors based on heat transfer determined thatThermo-Lag barriers reduced ampacity by approximately 12%, however, for conservatism, a

derating factor of 15% was selected for power cable sizing (Ref. 2.21).

4.3 Control and instrumentation cables are not subject to ampacity limits due to the small levels ofcurrent used. Voltage drop in the control circuit is usually the limiting factor for cable designand normally requires the installation of larger cables to perform required functions. Thisapplies to control and signal cables in conduits, cable trays and enclosures.

The continuous device current load was used as a basis for this calculation. Momentary loadrequirements, i.e., those lasting less than 1 minute, are not considered. Loads of this durationare not sustained long enough to induce heat in the affected power cables. Abnormally highlevels of current for devices are detected by protective devices and the component is designedto be separated from the power source before the condition damages the component or cable.

4.5 Fire protection barriers in St. Lucie Unit 1 and Unit 2 were originally installed on cable conduitsand conduit boxes only. There are no power cable trays wrapped with fire barriers at the St.Lucie station. However, sections of conduits 11001F-3", 11001H-3", 21001F-4" and21001H-4" are routed in a "banked" configuration for portions of their route. There were notested configurations for banked conduit runs; therefore, the ampacity correction factor forcable tray were used. The banked conduits are in a single plane, the conduit size of 4 inchesis similar to the depth of cable tray used at St. Lucie and the required protection is for one-hour(1-hr) with detection and suppression. Using the cable tray derating factor for three-hour (3-hr)fire barriers gives a more conservative estimate of the current carrying margin for the affectedcables (11001F, 11001G, 11001H, 11001J, 21801W, 21801X, 21801Y and 21801Z).

aepcalc.05/98

f

//


4.6 This calculation applies to cables in protected conduits inside and outside containment of bothSt. Lucie units. The ambient temperature for cables inside containment is assumed to be 50'C.Outside of the containment buildings, ambient temperatures are assumed to be 40'C (104'F).Operating temperatures in the RAB are normally closer to 30'C; however, for conservatism, thehigher temperature will be used.

4.7 Power cables utilized in St. Lucie station are rated for operation at 90'C conductor temperature.The higher the insulation temperature rating, the greater the allowable ampacity for a givenconductor size.

4.8 Conduits protected in St. Lucie Unit ¹1 use (3) hour barrier one and one-quarter (1-'/i) inchnominal thickness material. Conduits protected in St. Lucie Unit ¹2 may be protected with one(1) hour 5/8" nominal thickness material or three (3) hour one and one-quarter (1-~/i) inchnominal thickness material. Upgrades to the fire barrier systems for one-hour (1-hr) protectionwas provided by using nominal 5/8" thickness Thermo-Lag 330-1 pre-shaped half-roundsections overlaid with 3/8" nominal thickness Thermo-Lag sections. Three-hour (3-hr) upgradesis provided by using one and one-quarter (1-~/~) inch nominal thickness Thermo-Lag basematerial with overlays of Thermo-Lag 770-1. The number of 770-1 wraps is dependent onconduit cable fill percentages.

4.9 Conductor current values for 600 volt cables are based on lEEE standard values (Ref. 2.75) forconductors rated 600 to 5000 volts, 90'C (194'F) ambient temperature with no solar heatingand zero (0) ft/s ventilation/air flow.

4.10 Where load values are only known in kilovolt-amperes (KVAs), the current is determined by;

amps (single phase AC or DC):

P3xVamps (three phase AC)

ampcalc.05/98


4.11 The ampacity testing performed for Comanche Peak Plant was performed for conduits rangingin size from 3/4 inches to 5 inches. Conduits covered with Thermo-Lag 330-1 fire barriers atSt. I ucie plant range from 1-1/2" to 5". The heat load (I'R loss) from each cable section isincluded in Tables 5.5a, 5.5b. 5. 5.5c. These heat loads were compared to the tables/chartsused by Turkey Point where heat loads were compared to the Omega Point Laboratory test forTexas Utilities Comanche Peak Plant (Ref. 2.20). From this it is concluded that the test samplesutilized are representative of the configuration at St. Lucie.

4.12 There are no installed cable tray sections at St. Lucie protected by Thermo-Lag fire barriers.However, there is a large pull box installed in St. Lucie Unit 2 elevation (-) 0.50', box 8243'I-SAwhich was reviewed due to size. The box is a 42" x 42" x 12" enclosure used as a pullboxfor the power cables to AFW pump 2A. The horizontal surface on the bottom of the enclosureis expected to be most affected by fires in the 12" box depth. Because the original testperformed by TSI included a 12" cable tray section and the Comanche Peak test included a 24"cable tray section, the large enclosure in St. Lucie Unit 2 is considered bounded by the previoustests.

Revision 2 to PCM 97040, to upgrade to south wall of the 28.67'levation of the ReactorAuxiliary Building 'A'able Penetration Area Extension (Loft), will add a short section ofThermo-Lag fire barrier to cable tray C17 at plan point (2116), near column RAI-RA3. This isa control cable tray and is not affected by the installation of Thermo-Lag fire barriers. Controlcables are not required to be evaluated for cable ampacity derating due to low level of currentnormally used.

4.13 ln accordance with Reference 2.101, the thickness of the Thermo-Lag and the gaps within theThermo-Lag, found during the inspection of the correctly installed configurations for the Unit1 5 2 one hour and three hour barriers, were in accordance with the installation instructionsof TSI. Therefore, the configuration of the Thermo-Lag barriers at St. Lucie are bounded by theTSI installation instructions.

4.14 FPL participated in a generic industry test program managed by the Nuclear Energy Institute(NEI) which included verification of the chemical composition of Thermo-Lag material. As partof the NEI test program, a pyrolysis gas chromatographic analysis was used to qualitativelycompare the organic constituents of various Thermo-Lag samples. St. Lucie provided (9)samples from installed and warehouse Thermo-Lag materials. AII of the samples tested atNUCON Laboratory in Columbus, Ohio were found consistent in terms of chemical composition(Ref. 2.103). Results of the testing program were sent directly to the NRC by NEI letter datedOctober 3, 1995. Per Reference 2.102, the NRC stated that there was essentially nodifferences between the samples for different lots, areas of the country and the year thematerial was purchased.

cuapcslc.05/98

' CALCULATIONNO. REV. SHEET NO. ~4.0

4.15 Applying the Revision 2 ampacity correction factors for 3-hour fire barriers to cable 110028(Battery Charger 18) reduced the percent margin to approximately 2%. This was acceptablewith existing derating factors but did not allow for any other variables or potential deratingfactor increases. A review of the background for the load current of this cable showed that thecalculation for sizing the battery chargers and Revision 1 of this made the assumption that forworst case loading, the chargers were assumed to be in 'current-limit'onditions (315 Amps).After the initial 60 seconds following a I.OOP, the chargers are loaded on the respectiveemergency diesel and any current not required by the dc system is used to recharge the battery.Current demand to recharge the station batteries is rninirnal due to the short duration of thedischarge.

Based on system loading, only approximately (6) Ampere-hours is discharged from the batterywhich represents 0.25% of the battery capacity. In actual application, removing 0.25%capacity from the battery results in a smaller additional current draw from the chargers. Normalrecharging takes place over a longer period of hours, typically between 8 - 10 hours (Ref. 2.85, 2.9). Based on the battery loading calculation (Ref. 2.6), the battery/charger will see a peakdemand following the LOOP of 228 Amperes which will further diminish after the first (30)minutes. Using this value results in a margin of 39.65% for cables 110028 and 116018..

In addition, with installed detection and automatic suppression, protection for conduit 110028is only required to be for 1-hour. Calculation PSL-BFSM-98-005 (Ref. 2.110) concluded that3-hour wrap on a 4" conduit extrapolated for 1-hour protection has a ACF of 0.952. With thisACF, the cable ampacity margin for 110028 becomes 64.09 %. To replace the existingThermo-Lag wall around Fire Zone C-578, Train '8'C Equipment/Inverter Room, fire barrierswere removed from 110028 and Battery Charger 188 conduit 116018, cable 116018, waschosen be relied on for safe shutdown in this area. The cables to Charger 188 are physicallythe same size as Charger 18 cables and the conduit, 116018, is routed more convenient forprotecting.

ampcalc.05/9>

i'CALCULATIONNO. REV. SHEET NO. ~

5.0

5.1 The documents listed in Section 2.0 of this calculation were reviewed to identify the cableswrapped with Thermo-Lag which must be considered for ampacity derating factors.

5.2 Bill of Material listings were reviewed for cables identified in 5.1 to determine individual cablesinsulation voltage rating and intended generic use, i.e., power or control and tabulated in Table5.1.

5.3 From information listed in documents of Section 2.0 and appropriate bills of material, Tables5.2, 5.3 and 5A were generated to identify affected cables in wrapped conduits. These tablesidentify cable types, usage voltage class, insulation voltage rating, a description of the cableload for power cables and the number of current carrying conductors in each conduit.

5.4 Motor load kilowatt and current ratings vary in prior documents depending on base values used.For this calculation, current values for motors were determined from nameplate listings onreferenced One-Line List drawings.

5.5 From this information and Section 2.0; Tables 5.5.a, 5.5.b and 5.5.c were created.

5.6 During the 1997 refueling outages for both St. Lucie units, cables in conduits previouslyrequired to be protected were reworked or rerouted into areas where the cables were no longerrequired to be protected. St. Lucie Unit 1 PCM 97034 rerouted cables 11001F, 11001G,11001H and 11001J which connect Station Service Battery 1A to DC Test Panel 1A fromelevation 19.5'ommon Hallway and 'B'lectrical Cable Penetration areas, Fire Zones C55Wand C-78, to elevation 43.0'rom the 'A'attery Room, through the 'A'witchgear Room tothe Cable Spread Room where the 'A'est panel is located, Fire Zones A60 and B57.

The cables which connect the 'A'C bus through the manual transfer switch, inverter 1A andto Instrument Bus 1lVIA, 11009G, 11009J and 11009Q, were relocated from the

19.5'ommonHallway, Fire Zone C55W, to the Cable Spread Room, Fire Zone B57, where theequipment is located.

St. Lucie Unit 2 PCM 96143 relocated cables 21001A, power to Battery Charger 1A from MCC1A5, cables 21810A and 21756Y which supply 125 volt dc power to 480 volt Switchgear 1A2and 4160 volt Switchgear 1A3 for breaker control and operation, and cables 20645C and20646A which supply power to miscellaneous equipment fed from RTG Boards 105 and 106.These cables were relocated out of the 19.5'ommon Hallway, Fire Zone C55W and the

'B'witchgearRoom, Fire Zone C56, into the 'A'C Equipment/Inverter Room through the CableSpread Room, Fire Zone B52.

The above cables have been removed from Tables 5.5a, 5.5b or 5.5c.

ampcalc. 05/98

'05.0

CALCULATIONNO.

(cont'd)

REV. SHEET NO. ~

St. Lucie Plant Cable Types

St. Lucie Unit 1: Reference Unit 1 Bill of Materials, 8770-B-325

BOM Cable Identification

D02-02

D03-03, D03-06, D03-07, D03-08D03-12

D1 5-06D26-02, D26-06

52-08

BOM Sheet

Sht. D2-1

Sht. D3-1

Sht. D3-9

S}lt. D26-01

Sht. D52-01

RevisionNo.

Description

Power Cable, 600V Crosslinked PolyethylenePVC Jacket for Overall Jacket (T e XLPP)

Control Cable, 600V, Crosslinked PolyethylenePVC Jacket for Overall Jacket (T e XLPPP)

Control Cable, 600V, Crosslinked PolyethylenePVC Jacket for Overall Jacket (T pe XLPPP)

Power Cable, 5000V (Re. CARS)

Power Cable, 600V, HT Kerite Insulation, FROverall Jacket (Ty e HT)

Control Cable, 600V, FR Kerite Insulation, FROverall Jacket (T e MCCC)

St. Lucie Unit 2: Reference Unit 2 Bill of Materials, 2998-B-325

BOM Cable Identification

D15-01, D15-02, D15-03

D26-02, D26-03, D26-04, D26-06, D26-07,D26-08D26-10

D52-03, D52-08

D54-05, D54-06, D54-07

D61-05, D61-06

D98

D99

BOM Sheet

Sht. D11-01

Sht. D26-01

Sht. D26-09

Sht. D52-01

SIlt. D54-01

SIlt. D61-01

RevisionNo.

3

Description

Power Cable, 5000V, Crosslinked Polyethylene,Lead Sheath 5 Neo rene Overall (T e XLPSLN)

Power Cable, 600V, HT Kerite Insulation, FROverall Jacket (Type HT)

Power Cable, 600V, HT Kerite Insulation, FROverall Jacket (T e LVPC)

Control Cable, 600V, FR Kerite Insulation, FROverall Jacket (Type MCCC)

Power Cable, 600V, Non-shielded, HT, KeriteInsulation FR Jacket (T e LVPC)

Si nal

Re: D26, D52, D54Re: D26

arapcalc.05/98

CALCULATlONNO. REV. SHEET NO. ~6.0 (cont'd)

ABLE 5.2

St. Lucie Unit 1

Cables in Conduits with (3) HourThermo-Lag 330-1 Fire Barrier System Protection

CABLE CONDUIT BM/Id Type Uolt Insulation Device c/c

10504 A10832A

.11601B11002F

110026

11002H

11002J

11002M11002 N11002P11002Q

10504A1155211601B11002F,1488511002F,1488511002H,1488611002H,1488611002M11002M11002P11002P

D26-06D15-06D02-02D02-02

3-1/c ¹23-1/c ¹4/02-1/c ¹5001-1/c ¹500

Class RatingM 600U 5000M 600M 600

D02-02D02-02D02-02D02-02

1-1/c ¹5001-1/c ¹5001-1/c ¹5001-1/c ¹500

M 600M 600M 600M 600

D02-02 1-1/c ¹500 M 600

D02-02 1-1/c ¹500 M 600

D02-02 1-1/c ¹500 M 600

HVE-9BICW P1A

Batt Chgr 1BB125VDCBus 1B

Batt. LeadsII II

I( I1

II II

II II

II II

125VDCBus 1B

Batt. Leads

2222

hlQZES: Reference 8770-B-328, Sheet BA, Revision 2, "Cable and ConduitNotes".

C - control or low voltage power (i.e., 120 volt to ground)M -.-medium voltage (i.e., 480 volt nominal)c/c - number of current carrying conductors in same conduit

List Installation

ampcnlc.05/98

CALCULATIONNO. REV. SHEET NO. ~5.0 (cont'd)

St. Lucie Unit 2


CABLE CONDUIT BM/Id Type Volt Insulation c/c

20251A20504A20629A20834A2093 1A20948 F2095 6H209 90H21001A21009E21009J21009K21009U21608B21801A21801 W

21801X

21801Y

21801Z

25071P20504 A203362169625019Y20948F22020Q250 19Y21001 A21009 G21009 J28161J21009H22020Q21801A21001F,28058J21001F,28058J21001H,28058D21001H,28058D

D15-03D98-01D15-06D15-03D26-06D15-01D98-01D26-04D26-04D26-04D26-04D99-04D26-04D98-01D26-04D26-02

Class3-1/c ¹4/0 V3-1/c ¹4/0 P3-1/c ¹4/0 V3-1/c ¹4/0 V2-1/c ¹2 P3-1/c ¹500 V2-1/c ¹4/0 P2-1/c ¹2/0 P3-1/c ¹2/0 P2-1/c ¹2/0 P2-1/c ¹2/0 P2-1/c ¹2/0 P2-1/c ¹2/0 P2-'1/c ¹4/0 P3-1/c ¹2/0 P2-1/c ¹500 P

D26-02 2-1/c ¹500 P

D26-02 2-1/c ¹500 P

D26-02 2-1/c ¹500 P

Rating5000 LPSI P2A600 (D26-03) 2HVE-9B

5000 AFW P2A5000 ICW P2C600 Swgr 2A3-5

5000 Xfmr2B2/2BS600 (D26-03) DG 2A Exc Cub600 Swgr 2A2-6600 Bat Chgr 2A600 Inst Bus 2MA600 Inv 2A600 (D26-04) Inv 2C600 Inst Bus 2MC600 (D26-03) DG 2A CP600 Bat Chgr 2AA600 DC Bus 2AA

DC Bus 2AA600 DC Bus 2AA



DC Bus 2AA

4

hKEES Reference 2998-B-271, Sheet 2-14, Revision 2, "Electrical General Installation Notes".L - low level signal, not powerC - control or low voltage power (i.e., 120 volt to ground)P - medium voltage power (i.e., 480 volt nominal)V - high voltage (i.e., 4160 volt nominal)c/c - number of current carrying conductors in same conduit()D - ¹ (cable size) duplex construction()T - ¹(cable size) triplexed construction()STP - ¹(cable size) shielded twisted-pair

ampcnlc. 05/98


HRBLE R4

St. Lucie Unit 2


CABLE CONDUIT BM/Id Type Volt Insulation c/c

20292 A20597 J20597N20630A20833 A20946F20948 A210 10U21118 A21643 G21643R25050W

20292A20597N20597N28093 C2155322006S20948 A21010H22020Q22016H21643R25067M

D26-08D26-03D99-01D15-03D15-03D15-01D15-01D26-04D98-10D26-10D26-10D26-04

1-3/c ¹12T4-1/c ¹4/03-1/c ¹4/03-1/c ¹4/Q3-1/c ¹4/03-1lc ¹5003-1/c ¹5002-1/c ¹2/02-1/c ¹42-1/c ¹42-1/c ¹42-1/c ¹2/0

Class RatingP 600P 600P 600 (D26-03)V 5000V 5000V 5000V 5000P 600P 600 (D26-10)P 600P 600

600

Hydz Pmp 2B 1-TH2 Recomb 7H2 Recomb 7AFW P2B 3ICW P2B 3Xfmr 2A5 3

Xfmr2B2/2B5 3Inst Bus 2MD 2DG 2A Ann 6RM/RS26-1 2

RM/RS26-18 2125V Bus MD 3

ampcalc.05/98


St. Lucie Unit 1

(3) Hour Thermo-Lag 330-1 Fire Barrier System Wrap

Ref.

CableAffectedDevice Cable Size

Cable Hp/ LoadResistance KVA Amps/ 1000 ft (lt)

(Ref 2.98-2.100

ACF(Ref.

2.20 )

ACF'Ref.C/C

2.110)

C/CDerating

CableAmpacity(ic)IEEE

Rev 2

Derated DeratedAmpacity Ampacity (I')

(I') Rev 2

MaximumDerated Heat

Loadwatts/ft)

Actual HeatLoad

(Watts/ft)Margin Margin

Rcv 2

2.93 10504 A HVE-9B 3-1/C A2 0.2113 40 49 .80 .973 3 1.0 112 89.6 108.976 5.55 1.52 91.02 122.40

2. 6 11002F11002G

2.92 10832A

2.6 11601 B

ICW PI A

CHRGR IBB

125VDC TESTPNL IB

3-1/C I4/0

2-1/C F500

l-l/Cf500I I/C gSOO

0.0278

0.0278

68KVA

228

213

0.0655 600 81 .80

.80

.69

.973 3

.94 2

.51 2

1.0

1.0

1.0

398

398

190.4 231.574

318.4 374.12

549.24 405.96

7.67

24.63

1.29

5.52

5.34

143.95 185.89

111.30 64.09

114.70 90.59

2. 6 11002H11002J

125VDC TESTPNL IB

I-I/Cf5001-1/C f500

0.0278 213 .69 .51 2 1.0 398 549.24 405.96 24.63 5.34 114.70 90.59

2. 6

2. 6

11002M11002N

11002P11002

125VDCBUS IB

125VDCBUS IB

l-l/C //500l-l/C $500

l-l/C f500l-l/C ft500

0.0278

0.0278

213

213

.80

.80

.94 2

.94 2

1.0

1.0

398

398

318.4 374.12

318.4 374.12

24.63

24.63

5.34,

5.34

114.70 75.64

114.70 75.64

hlates 4 battery chargers are current-limited to 315 amps output, protected conduit 11601B with cable 11601B to Charger 1BB, same load as11002B1. Conduits protected with 3-hour wrap not required and not upgraded. Cables 10504A and 10832A (AFC' 0.973) Ref. 2.110

anpcalc.05/98

CALCULATIONNO. REV. SHEET NO. ~5.0 (cont'd)

Iah~A~St. Lucie Unit 2

(3) Hour Thermo-Lag 330-1 Fire Barrier System Wrap

Ref.

Cable AffectedDevice

Cable Size CableResistance/ 1000 ft

(Ref 2.98-2.100

Hp/KVA

LoadAmps

(lr)

ACF(Ref.2.20)

ACF'Ref.

2.110)

C/C C/CDerating

CableAmpacity(lc) IEEE

Rev 2

Derated Derated MaximumAmpacity Ampacity (I') Derated Heat

(I') Rev 2 Load(Watts/It)

Actual HeatLoad

(Watts/II)

% Margin % MarginRev 2

2.94 20251 A

2.97 20504 A

2.94 20629A

LPSI P2A

2HVE-9B

AFW P2A

3-1/C //4/0

3-1/C g4/0

3-1/C $4/0

0.0655

0.0655

0.0655

400 50

60 65

350 47

.80

.80

.80

0.952

0.952

0.952

1.0

1.0

1.0

190.4 226.576 7.6725

190.4 226.576 7.6725

190.4 226.576 7.6725

0.4913

0.8302

0.4341

295.20

320.43

353.15

248.58

382.08

2.95 20834 A ICW P2C 3-1/C g4/0 0.0655 600 82.4 .80 0.952 1.0 190.4 226.576 7.6725 1.3342 139.81 174.97

2.192.94

2.7

20948F

20956Ha21118A21608B

2.7 20931A SWGR2A3

STA SVC Xfinr2B2/2BS

DG 2AEXC CUB

2-1/C g2

3-1/C F500

2-1/C I4/02-1/C S42-IICI/'4IO

0.2113

0.0278

0.0655

1933KVA

50.0negligible

6.0

.80

0.5 .80

268 .80

0.952

0.952

0.952

0.80

1.0

0.80

112

398 318.4 378.896

152.32 181.2608

9.2370

9.8208

71.68 85.2992 4.7390 0.0002

0.9825

0.0141

14876

24.18

16959.84

41.38

216.16 262.52

2.13 20990H SWGR 2A2 2-1/C //4/0 0.0655 0.5 .80 0.952 0.80 152.32 181.2608 6.5472 31516 36152.16

2.24 21009 E

2.6 21009 J INVTR2AC In)

2-1/C k2/0

INST BUS 2MA 2-1/C It2/0 0.1053

0.1053 10KVA

24.7 .80

.80

0.952

0.952

1.0

1.0

173

173

4.4157138.4 164.696

138.4 164.696 4.4157

0.1285

0.2883

48b23 566.79

291.35 345.12

.26 21009K

2.24 21009U

2.13 21801W21801X

INVTR2CC In

2-1/C tr2/0

INST BUS 2MC 2-1/C g2/0

125VDC BUS 2AA 2-1/C f5002-1/C $500

0.1053

0.1053

0.0278

10KVA

.80

28.4 .80

278 .69

0.952V

0.952

0.952

1.0

1.0

0.80

173

173

796

138.4 164.696 4.4157

138.4 164.696 4.4157

439.392 606.2336 23.4547

0.2883

0.1699

8.5940

291.35

409.86

65.20

345.12

479.92

118.07

2.13 21801Y21801Z

125VDC BUS 2AA 2-1/C k'5002-1/C $500

0.0278 278 .69 0.952 0.80 796 439.392 606.2336 23.4547 8.5940 65.20 118.07

ampcalc.05/98


5.0 (cont'd)

St. Lucie Unit 2(1) Hour Thermo-La 330-1 Fire Barrier S stem Wra

Ref.

CableAffectedDevice

Cable Size CableResistance/ 1000 ft

(Ref 2.98-2.100

HP/ Load ACFKVA Amps (Ref.

(lt) 2.20)

ACF'Ref.

2.110)Rev. 2

CICC/C Derating

CableAmpacity(Ic) IEEE

Rev 2

DentedAmpa city

(I')

Derated Maximum Actual HeatAmpacity (I') Derated Heat Load

Rev. 2 Load (Watts/ft)(Watts/It)

% Margin % MarginRev 2

2.96 20292A

2.17 20597J2.90 20597N

2.94 20630 A

2.94 20833 A

HYDRAZINEPUMP

H2 RECOMB

AFW P2B

ICW P2B

1-3/C tr12T

4-1/C //4/03-1/C 8'4/0

3-1/C /14/0

3-1/C //4IO

2.1058

0.0655

0.0655

0.0655

3 4.6

600 82.4 .89

75KVA

350 47 .89

.94

.94

.94

.94

3 1.0

7 0.70

3 1.0

3 1.0

28

148.274

211.82

211.82

26.32

156.604

4.21

10.86

9.50

9.50

0.1337

3.7139

0.4341

1.3342

461.09

70.98

367.72

166.78

472.17

74.00

376.00

171.50

2.19 20946F2.94

STA. SVC Xfmr2AS

3-1/C //500 0.0278 1933KVA

268 .89 .94 3 1.0 398 354.22 374.12 11.43 5.99 38.15 39.60

2.19 20948A2.94

2.24 21010 U

2.13 21118 A

STA SVC Xfmr2B2/2BS

3-1/C t/500

120VAC INST BUS 2-1/C I/2/02MD

DG 2A Ann 2 I/C 4'4

0.0278

0.1053

0.3364

1933KVA

10KVA

268 .89

1.0

28.4 .89

.94

.94

.94

3 1.0

2 1.0

6 0.80

398

173

85

354.22

153.97

60.52

374.12

162.62

11.43

5.47 0.1699

0.002

38.15

467.22

6166

39.60

472.61

6292.00

2.22 21643 G RM/RS-26-1 2-1/C $4 0.3364 2.5 .89 .94 2 1.0 85 75.65 79.9 4.13 0.0042 3032.80 3096.00

2.22 21 643 R

2.7 2SOSOW

2.24

RM/RS-26-18 2-1/C I/4

125YDC BUS MD 2-1/C //2/0

0.3364

0.1053

2.5 .89

1.5

.94

.94

2 1.0

3 1.0

85 75.65

153.97

79.9

162.62

4.13

8.20

0.0042

0.001

3032.80

10639

3096.00

10741.33

anpcalc. 05/98

CALCULATIONNO. REV. SHEET NO. ~6 ~ 0 E1KULXS

The results shown in Tables 5.5.a., 5.5.b. and 5.5.c. indicate thatwhen using newer ampacity correction factor (ACF) as determined incalculation, PTN-BFJM-96-005, for upgraded Thermo-Lag fire barrierinstallations, sufficient margin exists between operating cable loadsand cable current carrying capacity (ampacity). This calculationrevisited prior calculations, and Appendix R and RG 1.75 documentsto eliminate the conservatism that existed in the earliercalculations when considering the load on a specific cable. Ampacityvalues used in this calculation are loads that exist longer than 60seconds; i.e., do not include the battery or valve loads during thefirst minute which are reduce significant'ly for longer operation.As listed above, the smallest margin for St. Lucie Unit 1 Thermo-Lag(3) hour upgraded wrapped conduits is ~>. This margin is for the125 volt DC power cables from Battery 1A to Battery Test Panel 1A forsupplying 125 volt DC bus 1A. Loads on these cables are steady stateloads after the first minute of operation when the cable is subjectedto continuous loads. Loads on the battery cable are higher in thefirst minute due to cycling of valves and other motors.

The smallest Unit No. 2 margin for (3) hour upgraded wrapped conduitsis M~Q for the 4160 volt power feeder cables to Station ServicesTransformers 2B2/2B5. This value contains some conservatism sinceit assumes 100% transformer loading. For (1) hour upgraded wrappedconduits in St. Lucie Unit 2, the smallest margin is 39 ~ for the4160 volt feed to Station Services Transformer 2A5. This valueincludes conservatism, similar to the margin to Transformers 2B2/2BS,since it assumes 100~ transformer loading.The original calculations for cable derating in St. Lucie Unit 1 andUnit 2 used a value considered conservative at 15%. This calculationhas determined that acceptable power cable margins exist forinstalled cables in St. Lucie Plant Unit 1 and Unit 2 when usingderating values of 11% for (1) hour fire barriers and 20% for (3)hour fire barriers assuming the installation of Thermo-Lag 330-1 andThermo-Lag 770-1 upgrade fire barrier systems.

A revision to the cables in conduits 21001F-4" and 21001H-4" wasincluded in Revision 1 to this calculation. These conduits werefound to be in a banked configuration for part of their route. Forconservatism, the ampacity derating factor for cable trays wasapplied to these conduit sections. The resultant ampacity marginchanged from 91.53% to 65.20% using the cable tray derating factorof 31%'.

ampcalp. 05/98

CALCULATIONNO. REV. SHEET NO. ~6 ~ 0 RRZULXR

Revision 1 concluded that installed conduit configurations at StLucie plant are bounded by test performed at Omega laboratories forTexas Utilities'omanche Peak Nuclear Plant.Revision 2 to this calculation resulted in lower margins based on thecable current carrying capacity for ambient indoor conditions of NoSun - 0 Ft/s'ir flow/ventilation. In addition, field walk downsfor enhancements of the Thermo-Lag fire barriers on conduits 11002F-3" and 11002H-3" in the Unit 1 Reactor Auxiliary Building CableSpreading Room, identified sections of these conduits where a commonenclosure extended over both conduits. Cables in these conduits werederated using the existing cable tray derating factors to determinemargins.

As a result of the recalculation of circuits protected with Thermo-Lag fire barriers, the resultant lowest ampacity margin in Unit 1 forthree-hour (3) fire barriers is ~99'or the cables in conduit11601B-3".

In Unit 2, the lowest margin for conductors in conduits with three-hour (3) protection is ~~ for the power feeder to Station Servicetransformer 2B2/2B5. The smallest margin with one-hour (1)protection is ~~, for the power feeds to Station Servicestransformers 2A5 and 2B2/2B5. Based on the more conservative valuesused in the St. Lucie ampacity derating calculation above and thereview of the FPC ampacity derating test, the configuration andampacity derating for St. Lucie is bounded by the FPC tests.

ampcalc. 05/98

rev 2 to 'cable derating in conduits w/fire barrier coatings.' · derating factors...

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