ML20217M138
| ML20217M138 | |
| Person / Time | |
|---|---|
| Issue date: | 04/01/1998 |
| From: | Callan L NRC OFFICE OF THE EXECUTIVE DIRECTOR FOR OPERATIONS (EDO) |
| To: | Seale R Advisory Committee on Reactor Safeguards |
| References | |
| ACRS-GENERAL, GL-89-10, GL-96-05, GL-96-5, NUDOCS 9804080015 | |
| Download: ML20217M138 (6) | |
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UNITED STATES j
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NUCLEAR REGULATORY COMMISSION WASHINGTON, D.c. was mmq
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April 1, 1998 Dr. Robert L. Seale, Chairman Advisory Committee on Reactor Safeguards j
U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001
Dear Chairman Seale:
. This is in response to your letter of March 12,1998, to Chairman Jackson in which you discussed the views of the Advisory Committee on Reactor Safeguards (ACRS) regarding the NRC staffs and industry's efforts to resolve issues related to motor-operated valves (MOVs)
L raised in Generic Letters (GLs) 89-10, " Safety-Related Motor-Operated Valve Testing and
- Surveillance," and 96-05, " Periodic Verification of Design Basis Capability of Safety-Related Motor-Operated Valves." You noted that this subject has been of interest to the ACRS for almost a decade, and you concluded that the efforts of the staff and industry have resulted in a program that increases assurance of the proper functioning of MOVs during safety operations.
The staff fully agrees with your views and believes that a continuing interaction between the staff and industry's Joint Owners Group (JOG) on the long-term periodic verification program will help ensure that MOVs will continue to be capable of performing their intended functions under design-bases conditions. The staff also plans to review actions taken by those plants not participating in the JOG on an individual basis.
The staff will continue to keep the ACRS informed of any significant developments in the long-term MOV periodic verification program. We look forward to future discussions with the ACRS on these and other matters.
Sincerely,
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L. J ph Callan Ex i*ve Director for Operations cc: Chairman Jackson h
Commissioner Dicus.
Commissioner Diaz Commissioner McGaffigan BC FEf CENTER CGPY OCA OPA 2
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CONTACT:
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April 1,1998 O
Dr. Robert L. Seale, Chairman Advisory Committee on Reactor Safeguards U.S. Nuclear Regulatew Commission Washington, D.C. 205t '001
Dear Chairman Seale:
This is in response to your letter of March 12,1998, to Chairman Jackson in which you discussed the views of the Advisory Committee on Reactor Safeguards (ACRS) regarding the NRC staffs and industry's efforts to resolve issues related to motor-operated valves (MOVs) raised in Generic Lotters (GLs) 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance," and 96-05, " Periodic Verification of Design Basis Capability of Safety-Related Motor-Operated Valves." You noted that this subject has been of interest to the ACRS for almost a decade, and you concluded that the efforts of the staff and industry have resulted in a program that increases assurance of the proper functioning of MOVs during safety operations.
The staff fully agrees with your views and believes that a continuing interaction between the staff and industry's Joint Owners Group (JOG) on the long-term periodic verification program will help ensure that MOVs will continue to be capable of performing their intended functions under design-bases conditions. The staff also plans to review actions taken by those plants not participating in the JOG on an individual basis.
The staff will continue to keep the ACRS informed of any significant developments in the long-term MOV periodic verification program. We look forward to future discussions with the ACRS on these and other matters.
Sincerel
%-*y,w~a by LJ.CaBan L. Joseph Callan Executive Director far Operations cc: Chairman Jackson Commissioner Dieus Commissioner Diaz Commissioner McGaffigan SECY OGC OCA
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Dr. Robert L. Sea o, Chairman Advisory Committse on Reactor Safeguards U.S. Nuclear Regulatory Commission Washington, D.C. 20555-0001-
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Dear Chairman Seale:
This is in response to your letter of March 12,1998 to Chairman Jackson in which you di,sc the views of the Advisory Committee en Reactor Safeguards (ACRS) regarding the NRC staffs and industry's e# orts to resolve issues related to motor-operated valves (MOVs) rai,se'd in Generic Letters (GLs) 89-10, " Safety-Related Motor-Operated Valve Testing and 5urveillance,"
' and 96-05, " Periodic Verification of Design Basis Capability of Safety-Related Mo)
T Valves."; You'noted that this subject has been of interest to the ACRS for alpiost a decade, and
- you concluded that the efforts of the staff and industry have resulted in a ogram that increases assurance of the proper functioning of MOVs during safety operations.
The staff fully agrees with your views and believes that a continui Interaction between the staff and industry's Joint Owners Group (JOG) on the long-term pari c verification program will help
- ensure that MOVs will continue to be capable of performing t intended functions under design-bases conditions. The staff also plans to review acti s taken by those plants not participating in the JOG on an individual basis.
The staff will continue to keep the ACRS informed of y significant developments in the long-term MOV periodic verification program. We look fo ard to future discussions with the ACRS -
on these and other matters.
Sincerely, L. Joseph Callan Executive Director for Operations cc: The Chairman Commissioner Dieus Commissioner Diaz
- Commissioner McGaffiga SECY
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rr 3/2DE EDO Principal Correspondence Control FROM DUE: 04/20/98 EDO CONTROL: G980171 DOC DT: 03/12/98 FINAL REPLY:
R. L. Seale ACRS TOs Chairman Jackson FOR SIGNATURE OF
ROUTING:
RISK-RANKING APPROACH FOR MOTOR-OPERATED VALVES Callan Thadani Thompson Norry Blaha Burns DATE: 03/20/98 Mitchell, OEDO ACRS File ASSIGNED TO:
CONTACT:
NRR Collins lSPECIAL INSTRUCTIONS OR REMARKS:
Prcpare response to ACRS for EDO signature.
Add Commissioners and SECY as cc's.
NRR ACT10ii: Ptoienun? DE' "'~"
NRR RECEIVED: ria rch 20, 1998 NRR ROUTING: Collins /Miraglia ACTION Boger Ev'"rs DUE TO NRR D'.RICTOR OF ~-
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OFFICE OF THE SECRETARY CORRESPONDENCE CONTROL TICKET PAPER NUMBER:
CRC-98-0230 LOGGING DATE: Mar 16 98 ACTION OFFICE:
- EDO AUTHOR:
R.L. SEAL AFFILIATION:
ADVISORY COMMITTEE'ON REACTOR SAFEGUARDS ADDRESSEE:
CHAIRMAN JACKSON
' LETTER DATE:
Mar 12 98 FILE CODE: OM-7 ACRS
SUBJECT:
RISK-RANKING APPROACH FOR MOTOR-OPERATED VALVES ACTION:
Appropriate DISTRIBUTION:
. CHAIRMAN, RF SPECIAL HANDLING: NONE CONSTITUENT:
HOTES:
DATE DUE:
SIGNATURE:-
DATE SIGNED:
AFFILIATION:
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WASHINGTON, D. C. 20600 March 12, 1998 i
The Honorable Shirley Ann Jackson Chairman U.S. Nuclear Regulatory Commicsion Washington, D.C. 20555-0001
Dear Chairman Jackson:
SUBJECT:
RISK-RANKING APPROACH FOR MOTOR-OPERATED VALVES During the 449th meeting of the Advisory Committee on Reactor Safeguards (ACRS).
March 2-4, 1998, we reviewed the efforts of the staff and industry to resolve the issues raised in Generic Letters (GL) 89-10 and 96-05.
During this review, we had the benefit of discussions with representatives of the NRC staff and of the documents referenced.
This subject has been of continued interest to the ACRS for almost a decade, as evidenced by our report dated May 9,1989, on this subject and by our subsequent periodic reviews of the subject matter.
The staff and industry efforts have led to substantial increases in the reliability of motor-operated valves (MOVs) under flow conditions for design-basis accidents. Virtually all licensee responses to GL 89-10 have been closed out and a long-term resolution of this issue will be achieved through GL 96-05.
This progress has been made possible, to a large extent, by the cooperation between the staff ud the licensees, as both have recognized the significance'of this important safetv issue.
-i A Joint Owners Group (J0G), with representation from owners of 93 operating plants, was formed.
The J0G proposed a risk-ranking approach for MOVs.
The frequency of inspection and testing was then related to the risk to plant safety imposed by failure of the individual MOVs. The NRC staff reviewed the proposed program and issued a Safety Evaluation Report that endorsed the methodology with some limitations and conditions, which were accepted by the J0G.
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The staff's concern about the emphasis of the American Society of Mechanical Engineers Boiler and Pressure Vessel Code on stroke time and leak testing under normal conditions'was resolved by a combination of dynamic testing by the
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Electric Power Research Institute and instrumented diagnostic tests at nuclear power plants; -These results-provided an empirical database that.is being used
.to assess the performance of M0Vs.
Expert panels were used extensively to evaluate the risk ranking of systems and components. The lessons. learned from this experience should be helpful to the utilities in the. implementation of other programs that rely on expert panels for this purpose.
The efforts of the staff and industry have resulted in a program that increases' assurance-of the proper functioning of MOVs during safety operations.
Sincerely.
R.
L. Seale Chairman
References:
1.
NRC Generic Letter 89-10. " Safety-Related Motor-Operated Valve Testing and Surveillance." issued June 28, 1989.
2.
NRC.. Generic Letter 96-05.
" Periodic Verification of Design-Basis Capability of Safety-Related Motor-Operated Valves." issued September 18, 1996.
3.
NRC Generic Letter 9S-07 " Pressure Locking and Thermal Binding of Safety-Related Power-Operated Gate Valves." issued August 17, 1995.
4.
V-E-C-1658. Rev.1. " Risk Ranking Approach for Motor-0perated Valves in
. Response to Generic Letter 96-05." Westinghouse Electric Company. December 1997
'5.
NRC-Safety-Evaluation of BWR: 0wners' Group Topical Report NEDC 32264.
." Application of.Probabilistic Safety Assessment to Generic Letter 89-10 t
. Implementation"J(Revision 2) February 27,-1996.
6.
Letter dated October 30.1997, from T. M. Essig. Office of Nuclear Reactor Regulation.' NRC. to T. J. Rausch, Commonwealth Edison Company.
Subject:
Safety Evaluation of Joint Owners' Group Program on Periodic Verification of Motor-Operated Valves Described in Topical Report NEDC-32719 (Revision
- 2).
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ACRS report dated May 9. 1989. from Forrest J.
Remick. Chairman ACRS.
to NRC Chairman Lando W.
Zech.. Jr..
Subject:
Generic Letter on Safety-Related Motor-0perated Valve Testing and Surveillance.
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