Enclosure 6 Valve Design Discussions (Redacted) · Enclosure 6 Valve Design Discussions (Redacted)...
Transcript of 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
generat I on
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
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 6
[
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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
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 10
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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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Pressure, Seismic, & Preload Stresses[
. . . . . . . . .. ....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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Pressure, Seismic, & Preload Stresses[
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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Pressure, Seismic, & Preload Stresses[
© 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
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 21
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IIV Testing
[
I© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 22
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Inspection / Monitoring
[
I
@ 2012 Babcock & Wilcox mPower, Inc. All rights reserved. [CCI per Affidavit 4(a)-(d)] 23
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mzPo we,
Operating Experience
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 24
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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.
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 25
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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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Maintenance and Qualification
Q: 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 27
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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
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 28
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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
© 2012 Babcock & Wilcox mPower, Inc. All rights reserved. 29
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mDPowsr
Discussion
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