ML20205C210

Informs That NRC Staff Reviewed WCNOC 960918,970317 & 980429 Responses to GL 96-05, Periodic Verification of Design- Basis Capability of Safety-Related Movs. Forwards RAI Re MOV Program Implemented at Wolf Creek Generating Station

ML20205C210
Person / Time
Site:	Wolf Creek
Issue date:	03/26/1999
From:	Thomas K NRC (Affiliation Not Assigned)
To:	Maynard O WOLF CREEK NUCLEAR OPERATING CORP.
References
GL-96-05, GL-96-5, TAC-M97120, NUDOCS 9904010110
Download: ML20205C210 (3)

Text

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a March 26,1999 Mr. Otto L. Maynard President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office Box 411 >

Burlington, Kansas 66839

SUBJECT:

REQUEST FOR ADDITIONAL INFORMATION (RAl) REGARDING WOLF CREEK GENERATING STATION (TAC NO. M97120)

Dear Mr. Maynard:

The NRC staff has reviewed Wolf Creek Nuclear Operating Corporation's September 18,1996, -

March 17,1997,' and April 29,1998,~ responses to Generic Letter (GL) 96-05, " Periodic Verification of Design-Basis Capability of Safety-Related Motor-Operated Valves." As a result

~of the review, the' staff has determined that additional information is needed to complete the review. The information needed is detailed in the enclosure.

To assist the NRC staff in meeting its review schedule, we request that you respond to the RAI by July 15,1999.' The RAI and schedule for your response were discussed with Mr. Tony i Harris of your staff on March 23,1999.

If you have any questions, please contact me at (301) 415-1362.

Sincerely, Original Signed By Kristine M. Thomas, Project Manager 7

Project Directorate IV-2 ,

Division of Licensing Project Management Office of Nuclear Reactor Regulation Docket No. 50-482 DISTRIBUTION: / /

J Docket File - ACRS

Enclosure:

Request for Additionalinformation PUBLIC PDIV-2 Reading JZwolinski/SBlack OGC, O15B18

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Mr. Otto L Maynard March 26, t999 i

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' Jsy Silberg, Esq. Chief Operating Officer l Shaw, Pittman, Potts & Trowbridge Wo;f Creek Nuclear Operating Corporation 2300 N Street, NW P. O. Box 411 Washington, D.C. 20037 Burlington, Kansas 66839 Regional Administrator, Region IV Supervisor Licensing U.S. Nuclear Regulatory Commission Wolf Creek Nuclear Operating Corporation 611 Ryan Plaza Drive Suite 1000 P.O. Box 411 Arlington, Texas 76011 Burlington,-Kansas 66839 Senior Resident inspector U.S. Nus!aar Regulatory Commission U.S. Nuclear Re2ulatory Commission Resident inspectors Office l I

P. O. Box 311 8201 NRC Road Burlington, Kansas 66839 Steedman, Missouri 65077-1032 Chief Engineer Utilities Division Kansas Corporation Commission '

1500 SW Arrowhead Road Topeka, Kansas 66604-4027 Office of the Governor State of Kansas 1 Topeka, Kansas 66612 Attomey General Judicial Center 1 301 S.W.10th 2nd Floor Topeka, Kansas 66612 County Clerk Coffey County Courthouse Burlington, Kansas 66839 Vick L. Cooper, Chief Radiation Control Program Kansas Department of Health and Environment Bureau of Air and Radiation Forbes Field Building 283 Topeka, Kansas 66620 I

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REQUEST FOR ADDITIONAL INFORMATION.ON RESPONSE TO GENERIC LETTER 96-05. " PERIODIC VERIFICATION OF DESIGN-BASIS CAPABILITY OF SAFETY-REl.ATED MOTOR-OPERATED VALVES" WOLF CREEK GENERATING STATION DOCKET NO. 50-482 1

1. By letter dated July 21,1995, the NRC staff closed its review of the motor-operated  ;

valve (MOV) program implemented at the Wolf Creek Generating Station (Wolf Creek) - )

in response to Generic Letter (GL) 89-10, " Safety-Related Motor-Operated Valve Testing and Surveillance," based on the results of NRC Inspection Report 50-482/95-04 1' (dated March 22,1995) and information contained in a letter from the licensee dated May 19,1995. In the inspection report, the NRC staff discussed certain aspects of WCNOC's MOV program to be addressed over the long term, including the need to revise the thrust calculations for valves BBHV0013, BBHV0014, BBHV0015, and BBHV0016 to use more conservative valve factors. in its July 21,1995, letter, the staff noted that WCNOC committed to dynamically test a sample of butterfly valves to validate its butterfly valve setup methodology. Describe the actions WCNOC has taken to address the specific long-term aspects of the MOV program at Wolf Creek noted in the NRC inspection report and the staff's letter dated July 21,1995.

2. By letter dated March 17,1997, WCNOC stated its commitment to implement the Joint Owners Group (JOG) Program on MOV Periodic Verification in response to Gl. 90-05.

The JOG program specifies that the methodology and discrimination criteria for ranking MOVs according to their safety significance are the responsibility of each participating licensee. As Wolf Creek is a pressurized water reactor (PWR) nuclear plant designed by Westinghouse, did WCNOC apply the Westinghouse Owners' Group (WOG) j methodology for ranking MOVs based on their safety significance as described in WOG i Engineering Report V-EC-1658-A (Revision 2, dated August 13,1998), " Risk Ranking Approach for Motor-Operated Valves in Response to Generic Letter 96-05," and the i NRC safety evaluation dated April 14,19987 If not, describe the methodology used for risk ranking MOVs at Wolf Creek in more detail, including a description of (1) the process used to develop sample lists of high-risk MOVs from other Westinghouse  :

plants; and (2) how expert panels were used to evaluate MOV risk significance. J

3. The JOG program focuses on the potential age-related increase in the thrust or torque required to operate valves under their design-basis conditions. In the NRC safety evaluation of the JOG program, dated October 30,1997, the NRC staff specified that licensees are responsible for addressing the thrust or torque delivered by the MOV motor actuator and its potential degradation. Describe the plan at Wolf Creek for  !'

ensuring adequate ac and de MOV motor actuator output capability, including consideration of recent guidance in Limitorque Technical Update 98-01 and its Supplement 1.

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