11/27/2012 - Updated mPower Presentation Slides, "Valve - NRC

gnerat i on

Valve Design DiscussionsNovember 27"1, 2012

(Redacted Version)

© 2012 Babcock & Wilcox mPower, Inc. All Rights Reserved. This document is the property of Babcock & Wilcox mPower, Inc. (B&W mPower) and is "CONFIDENTIALANDPROPRIETARY" to B&W mPower. Recipient and/or its representatives have, by receiving same, agreed to maintain its confidentiality and shall not reproduce, copy, disclose ordisseminate the contents, in whole or in part, to any person or entity other than the Recipient and/or Recipient's representatives without the prior written consent of 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.

cg e r• e r ato (1)

Agenda

• Objectives

* Background

* Brief reactor coolant system (RCS) overview

* [ ] Valve (IIV) Benefits• Emergency Core Cooling (ECC) LOCA response* IIV concept and lower vessel flange design

, Conceptual design and analysis

IV testing

IV inspection/monitoring

Operating experience

, IIV maintenance

SIIV qualification* Conclusions" Discussion

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 2

niPowerFfObjectives

• Describe IIV conceptual design, locations, andfunctions

* Discuss benefits for IIV use in mPower design

* Solicit feedback on approach for IIV

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 3

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BackgroundCurrent PWR's

, Large quantities of Class 1 piping, fittings and welds, Two reactor coolant pressure boundary (RCPB) isolation valves

mPowerTM Reactor

mPower Benefits, Proven technology - typical Class 1 RCPB componentso Eliminates potential failure of RCPB piping, fittings, welds, Drastically improves safety margins and overall reliability

I v[5, Ag~]

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCM per Affidavit 4(a)-(d)]

e3 r1 e (r a t i o 0

RCS Overview[

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

[CCl per Affidavit 4(a)-(d)] 5

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Benefits of IIVs

* Provide [boundary

• Eliminate

Iof reactor coolant pressure

RCS inventory loss through [ I

° Eliminate concerns [I

* Enable up to[ I

© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 6

cienet aitf(D)

Emergency Core Cooling (ECC)LOCA Response


g e n e rat o n-

moPowILOCA Response Without IIVs

I

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

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n)Ip Ic:r

[

I0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 9

g en e rat ior

mhrkPoRepnHigh Break LOCA Response With IIVs

[

1

I(V 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCl per Affidavit 4(a)-(d)] 10

Conceptual Design and Analysis(Letdown POVs)


cj e n e ration

Letdown IIV

I

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 12

nPoww%Cross Section View- Letdown 1IV

]


(3e n e rfl: L t 1 0 t -

mPouwrConceptual Design -lIIV

O[ ]o Materials

[

I* Flange Design

[

I

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

e. en e r at t0I)l

Pressure, Seismic, & Preload Stresses[

]© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 1s

ce n e rat 0o r't

em, Po&PwePressure, Seismic, & Preload Stresses

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

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Lower Vessel Flange Design

[

]


c e n e r oat i U-1

Lower Vessel Flange Design

]


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IIV Testing and Inspection


g e r-i e rat 1io U1

1IV Testing

I-ý7

Consistent with current practice

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

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Operating Experience


OE and Lessons Learned" Motor operated valves (MOV)

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

o Report MPR-2425-A used as a starting point for Class D valves0 Periodic verification based on safety significance classification and functional

margino Extensive qualification testing will be employed to quantify degradation issues

* Other power operated valves (AOV, SOV and HOV)o RIS 2000-03, program attributes will incorporate MOV lessons learned, Performance data information from NUREG/CR-6644

" Check Valves, NUREG/CR-5944 - Characterization of degradation and failures (e.g.)

, Nuclear Industry Check Valve Group (NIC)© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 23

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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


mnPonwerfi

Maintenance and Qualification


IIV Maintenance

e Typical MOV/POV Periodic Maintenance

, Packing replacement/adjustment

, Seal inspection/replacement

, Valve stem inspection

, Lubrication locations

, Bolt torque for bonnet to body joints

k Proper lifting and handling procedure

, Actuator maintenance

In kind Replaceable

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 26

q e- r''i e t ci [ i o i i

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

* Reports for production valve

(qualified valve)

per QV-7463.1


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Conclusions

* IIV design is an innovative application of provenvalve technology with performance within Codelimits

* IIV Application in the mPower design [I concerns and improves safety with

enhanced post LOCA response for the plant

0 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [M per Affidavit 4(a)-(d)] 28

Discussion


11/27/2012 - Updated mPower Presentation Slides, "Valve - NRC

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