enclosure 6 valve design discussions (redacted) · enclosure 6 valve design discussions (redacted)...

Enclosure 6Valve Design Discussions

(Redacted)

babcock & wilcox mPower, Inc., a Babcock & Wilcox company

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Valve Design Discussions(Redacted Version)

October 31, 2012

© 2012 Babcock & Wilcox mPower, Inc. All Rights Reserved. This document is the property of Babcock & Wilcox mPower, Inc. (B&W mPower)

This is a pre-application document and includes preliminary B&W mPower Reactor design or design supporting information and is subject to further internal review, revision, or verification.

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Objectives

Provide brief overview of reactor coolant system(RCS)

* Provide overview of I1V design,related topics

functions, and

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 2

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Purpose and Agenda

" Objectives

" Brief reactor coolant system overview

0 [ ] Valve (11V) Benefits

e Emergency Core Cooling (ECC) LOCA response

* IIV concept and lower vessel flange design

, Conceptual design and analysis

IIV testing

IIV inspection/monitoring

Operating experience

IIV maintenance

IIV qualification

* Discussion

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 3

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RCS Overview[

]C 2012 Babcock & Wilcox mPower, Inc. All rights reserved.

[CCl per Affidavit 4(a)-(d)]4

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Benefits of IIVs

* Provide [Boundary

Iof Reactor Coolant Pressure

" Eliminate design basis [

" Eliminate concerns[

I° Enable up to[

] scenarios

I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)]

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Emergency Core Cooling (ECC)LOCA Response


[

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J LOCA Response Without IIVs

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. rI'rn A W. A U.I.,,;4. AIl.I

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Idl 7L'-•,' P7I ,,.uuavn, .9Idl-lUj

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[

IC 2012 Babcock & Wilcox mPower, Inc. All rights reserved,

[CCI per Affidavit 4(a)-(d)] 8

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[ ] LOCA Response With IlVs[

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)]J

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nPOues r

Conceptual Design and Analysis


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Cross Section View- lIV[

I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCM per Affidavit 4(a)-(d)] 11

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Conceptual Design - IIV

I* Materials

[

I* Flange Design[

I

[CCI per Affidavit 4(a)-(d)]© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 12

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Pressure, Seismic, & Preload Stresses[

]© 2012 Babcock & Wilcox mPower, Inc. All rights reserved.

[CCI per Affidavit 4(a)-(d)] 13

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Pressure, Seismic, , Preload Stresses[

I© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 14

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. . . . . . . . .. ....V 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 15

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Pressure, Seismic, & Preload Stresses

Q 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 16

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2012Babock& Wlco m~oerInc Al rihts eseved [CI pr Afidait (a)(d) 17]@ 2012 Babcock & Wilcox mnPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 17

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© 202 Bbcok &Wilox ~owr, Ic. ll ighs rsered.(CCIperAffdavt 4a)-d)J 18]@ 2012 Babcock & Wilcox mnPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 18

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Lower Vessel Flange Design

[I

I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 19

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Lower Vessel Flange Design

[

1J

@ 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 20

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IIV Testing and Inspection


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mzPo we,

Operating Experience


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OE and Lessons Learned

Motor operated valves (MOV)

Industry experience and regulatory guidance shall be incorporated into MOV Program(e.g.)- JOG Program will be incorporated

Report MPR-2425-A used as a starting point for Class D valves

Periodic verification based on safety significance classification and functional margin

Extensive qualification testing will be employed to quantify degradation issues

* Other power operated valves (AOV, SOV and HOV)

RIS 2000-03, program attributes will incorporate MOV lessons learnedPerformance data information from NUREG/CR-6644- AOV actuator design error

- SOV environmental qualification

* Check ValvesNUREG/CR-5944 - Characterization of degradation and failures (e.g.)- Minimal relationship between age and failures

- Improper seating largest cause of failure among valves <4 in.


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OE and Lessons Learned (cont.)

Flanges and BoltsFlange leakage observed; caused by deterioration of bolt or boltpreload after several operation cycles

- GSI-29

Industry recommendations and guidelines incorporated in boltingintegrity program

- Material selection and testing

- Bolting preload control

- In-service inspection

- Plant operation and maintenance

- Evaluation of structural integrity of bolted joints

@ 2012 Babcock & Wilcox rnPower, Inc. All rights reserved. 26

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IIV Maintenance

MOV/POV Periodic Maintenance

, Packing replacement/adjustment

, Ball seal inspection/replacement

o Valve stem inspection

ý Lubrication locations

o Bolt torque for bonnet to body joints

, Proper lifting and handling procedure

, Actuator maintenance


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IIV Qualification

* Comply with

, QME-1 (2007): End of life test, design basis event, production testing.

, IEEE-323: Class 1 E equipment (MOV, SOV, Switches) purchasequalified components

, IEEE-382: Actuator qualification done by Actuator vendor

, IEEE-344: Seismic test/analysis methods (shake table testing,analytical methods)

° Create report per QV-7461.1 (qualified valve)

° Reports for production valve per WV-7463.1


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mDPowsr

Discussion


enclosure 6 valve design discussions (redacted) · enclosure 6 valve design discussions (redacted)...

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