GSI-191 Resolution Approach of GSI 191 Resolution Approach of the APR1400

Introduction

Sump performance evaluation approachSump performance evaluation approach

Conclusion

w M

eeti

ng

tio

n R

evie

wP

re-a

pp

lica

t8

th P

Introduction

Overview

NRC regulatory requirements

Clean plant criteria

w M

eeti

ng

tio

n R

evie

wP

re-a

pp

lica

t8

th P

1

GSI-191 Approach

Overview

Background Examined ECCS sump performance evaluation based on SKN 3&4 Examined ECCS sump performance evaluation based on SKN 3&4

Reviewed SECY 12-0093, ‘Closure Options for GSI-191’

Chose the option 1 to close the GSI-191 Chose the option 1 to close the GSI 191

SKN 3&4 sump performance evaluation

Mee

tin

g Fibrous insulation was used inside containment.

Debris generation and transportation evaluation were performed.

tio

n R

evie

w

Strainer performance analysis was performed by strainer supplier.

Pre

-ap

pli

ca

2

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Overview

Purpose Introduce GSI-191 resolution approaches for the APR1400 Introduce GSI 191 resolution approaches for the APR1400

– Clean-plant strategy

– Sump strainer performanceSump strainer performance

– In-vessel downstream effect

E t NRC t ff’ t th GSI 191 l ti

Mee

tin

g

Expect NRC staff’s comments on the GSI-191 resolution approach

tio

n R

evie

wP

re-a

pp

lica

3

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

NRC regulatory requirements

RG 1.82, Rev.4, Water Sources for Long-Term Recirculation Cooling Following a Loss-Of-Coolant AccidentFollowing a Loss Of Coolant Accident

Bulletin 2003-01, Potential Impact of Debris Blockage on Emergency Sump Recirculation at PWR

Mee

tin

g GL 2004-02, “Potential Impact of Debris Blockage on Emergency Recirculation During Design Basis Accidents at PWRs”

tio

n R

evie

w

Application Methodology for ECCS Sump Performance Evaluation NEI 04 07 “Pressurized Water Reactor Sump Performance Evaluation

Pre

-ap

pli

ca

NEI 04-07, Pressurized Water Reactor Sump Performance Evaluation Methodology”

NRC Safety Evaluation Report (SER) for NEI 04-07

4

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Clean plant criteria

SECY-12-0093, Closure Options for GSI-191, specifies three options.

Option 1 : clean-plant criteria

Option 2 : graded approach

Mee

tin

g Option 3 : separated resolution

tio

n R

evie

wP

re-a

pp

lica

5

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Clean plant criteria (cont.)

Option 1, May 2, 2012 letter from NRC to NEI, ‘Clean Plant Acceptance Criteria’Acceptance Criteria

Most straightforward of the three available options to close GSI-191

Strainer and in-vessel issues can be resolved by satisfying 15g/FA

li it “ l l t” it i

Mee

tin

g

limits as “clean-plant” criteria.

– Bypass test results can be used to meet the clean plant criteria.

tio

n R

evie

w – In-vessel downstream effect test can be exempted.

If the quantity of fiber transported to strainer is less than 1/16”

Pre

-ap

pli

ca

If the quantity of fiber transported to strainer is less than 1/16

theoretical debris bed, a head loss test is not required.

6

8th

APR1400-E-N-EC-120013-NP

Sump PerformanceSump PerformanceEvaluation Approach

Break selection

Debris generation

D b i t tDebris transport

Debris bypass

Debris head lossDebris head loss

Downstream effect

w M

eeti

ng

tio

n R

evie

wP

re-a

pp

lica

t

7

8th

P

GSI-191 Approach

Break selection

In accordance with RG 1.82 Rev. 4, following break selection criteria are considered.

1) Pipe break in the RCS or MS/FW line with largest potential for debris

2) Large breaks with two or more different types of debris2) Large breaks with two or more different types of debris Not applicable, since no fibrous and particulate insulations inside

ZOI (zone of influence) are used for the APR1400.

Mee

tin

g 3) Break in the most direct path to the sump Not applicable, since there is no direct path to sump.

tio

n R

evie

w 4) Large break with the largest potential particulate debris to insulation ratio by weight Not applicable, since no fibrous and particulate insulations inside

Pre

-ap

pli

ca ZOI are used for the APR1400.

5) Breaks that create a relatively high head loss from 1/8” fiber bed

8

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Break selection (cont.)

The APR1400 postulated break pipe line analysisBreak Location

Pipe linesSize

ID (in)Inside Secondary Shield Wall Outside

Secondary Shield Wall

SG Compartment PZR CompartmentNo. 1 No. 2

Hotleg lines 42 ⅹ ⅹ

Coldleg lines 30 ⅹ ⅹ

PZR Surge line 12 ⅹ

Mee

tin

g

PZR Surge line 12 ⅹ

Shutdown Pump inlet lines 12.812 ⅹ ⅹ

Direct Vessel Injection lines 10.126 ⅹ ⅹ

Charging line 2 624 ⅹ

tio

n R

evie

w Charging line 2.624 ⅹ

PZR aux. spray line 2.624 ⅹ

POSRV lines 7.75 ⅹ

Pre

-ap

pli

ca SIT injection lines 10.126 ⅹ ⅹ ⅹ

Main steam lines 30.907 ⅹ ⅹ ⅹ

Feedwater lines 20.376 ⅹ ⅹ ⅹ

9

8th

APR1400-E-N-EC-120013-NP

Lines are selected based on the need for ECCS sump recirculation. Hotleg line break is the limiting case that generates the largest amount of debris.

GSI-191 Approach

Debris generation

RMI application

RMI Application APR1400

Equipment

• Reactor Vessel (RV), • Reactor Coolant Pump (RCP), • Steam Generator (SG),

Mee

tin

g

( ),• Pressurize (PZR)

• RV/SG/RCP Connecting Pipe Lines,

tio

n R

evie

w

Pipe Lines

g p• MS/FW Pipe Lines,• Pipe Lines located inside the ZOI which are

subject to the jet impingement

Pre

-ap

pli

ca

10

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris generation (cont.)

Fibrous insulation application

Exclude fibrous insulation inside ZOI for the APR1400.

Assumed 30lbs of latent fibrous debris inside containment

Mee

tin

g

Assumed 30lbs of latent fibrous debris inside containment.

– 30 lbs of latent fibrous debris for conservatism in accordance with

tio

n R

evie

w

NEI 04-07

Pre

-ap

pli

ca

11

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris generation (cont.)

3D Section view for break location of RCS hotleg pipe

Mee

tin

gti

on

Rev

iew

Break Location

Pre

-ap

pli

ca

12

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris generation (cont.)

Damage pressure and corresponding volume-equivalent spherical ZOI radius based on SER for NEI 04 07ZOI radius based on SER for NEI 04-07

Destruction Pressure ZOI Radius/Insulation types Destruction Pressure

[psig] Break Diameter[L/D]

Transco RMI 114 2 0

Mee

tin

g

Darchem DARMET 114 2.0

Unjacketed Nukon, Jacketed Nukon with 6 17.0

tio

n R

evie

w

Jacketed Nukon with standard bands

6 17.0

Epoxy Coatings(Qualified) - 4.0

Pre

-ap

pli

ca

(Qualified)

13

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris generation (cont.)

Debris generation for pipe breaks sampled for the limiting case

BreakDebris type and amount

RMI Fibrous Coating

Hotleg pipe3.22 m3

[114 ft3]0 m3 0.084 m3

[3.1 ft3]

Mee

tin

g

MS pipe3.03 m3

[107 ft3]0 m3 0.07 1m3

[2.6 ft3]

tio

n R

evie

w

[ ] [ ]

FW pipe2.88 m3

[102 ft3]0 m3 0.018 m3

[0 7 ft3]

Pre

-ap

pli

ca

[102 ft ] [0.7 ft ]

14

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris generation (cont.)

Analysis of debris generation for the APR1400 hotleg break

Insulation types Amount

RMI [m3/ft3] 3.22 / 114

Mee

tin

g Fibrous Insulation [m3/ft3] 0 / 0

Coating [m3/ft3] 0 084 / 3 1

tio

n R

evie

w Coating [m3/ft3] 0.084 / 3.1

Latent Debris

Fiber [kg/lb] 13.6 / 30.0

Particle [kg/lb] 77 1 / 170 0

Pre

-ap

pli

ca

• 200 lb is used as the upper bound amount of latent debris for conservatism per NEI 04-07.

Debris Particle [kg/lb] 77.1 / 170.0

15

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris transport

IRWST section view Strainer in IRWST sump

Break Location

IRWST Sump #2IRWST

Sump #4SPILLWAY

24 in.

Debris Flow Path

Mee

tin

g

HVT

tio

n R

evie

w

IRWST Sump #1

IRWST Sump #3

SPILLWAY24 in.

Pre

-ap

pli

ca

16

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris bypass

The 15g/FA limit as “clean plant criteria” will be used for the

APR1400

Bypass test to confirm the supportable plant fuel debris

limit(15g/FA) will be performed after the strainer supplier is

Mee

tin

g selected.

tio

n R

evie

w

Strainer will be designed and installed in IRWST to meet the

15g/FA limit .

Pre

-ap

pli

ca

g

17

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Debris head loss

SECY-12-0093 allows head loss test exemption.

If quantity of fiber transported to strainer is less than 1/16” theoretical

debris bed, head loss test is not required.

After the strainer supplier is selected, the debris bed thickness will

Mee

tin

g be calculated.

Purchase specification requirement to meet 1/16” limit.

tio

n R

evie

w

If debris bed thickness exceeds 1/16”, head loss test will be

performed.

Pre

-ap

pli

ca

18

8th

APR1400-E-N-EC-120013-NP

GSI-191 Approach

Downstream effect (cont.)

In-vessel effect

15 /FA li it “ l l t it i ” i d f th i l i f 15 g/FA limit as “clean plant criteria” is used for the in-vessel issue of

GSI-191.

Bypass test will be performed to verify if 15 g/FA limit is met after

strainer supplier selected.

Mee

tin

g

Ex-vessel effect

tio

n R

evie

w

The hole size of strainer will be limited to prevent plugging and severe

wear of pumps, HXs, orifices, nozzles and valves of ECCS.

Pre

-ap

pli

ca

19

8th

APR1400-E-N-EC-120013-NP

Conclusionw

Mee

tin

gti

on

Rev

iew

Pre

-ap

pli

cat

22

8th

P

GSI-191 Approach

Conclusion

We will follow the SECY 12-0093, option 1.

The APR1400 is designed to meet clean plant criteria.

Only RMI will be used in ZOI.

Containment cleanliness program will be established.

Mee

tin

g

Strainer performance test will be performed after strainer supplier

tio

n R

evie

w is selected.

Pre

-ap

pli

ca In-vessel issue of GSI-191 can be resolved by satisfying

the 15 g/FA limit as clean plant criteria.

21

8th

APR1400-E-N-EC-120013-NP

g p