ML20216C232

Forwards SE Re thermo-lag Related Ampacity Derating Issues for Plant & TERs & 0419

ML20216C232
Person / Time
Site:	Wolf Creek
Issue date:	04/06/1998
From:	Thomas K NRC (Affiliation Not Assigned)
To:	Maynard O WOLF CREEK NUCLEAR OPERATING CORP.
Shared Package
ML20216C234	List: ML20216C232 ML20216C264 ML20216C323 ML20216C344
References
GL-92-08, GL-92-8, NUDOCS 9804140367
Download: ML20216C232 (3)

Text

a April 6,1998

!, Mr. Otto L. M.:yn:rd President and Chief Executive Officer Wolf Creek Nuclear Operating Corporation Post Office f3ox 411 Burlington, Kansas 66839

SUBJECT:

SAFETY EVALUATION ADDRESSING THERMO-LAG RELATED AMPACITY DERATING ISSUES FOR THE WOLF CREEK GENERATING STATION

Dear Mr. Maynard:

By letters dated April 16,1993, February 9,1994, July 15,1994, December 22,1994, February 15,1995, March 10,1995, March 29,1995, June 27,1995, June 20,1996, August 2, 1996, August 23,1996, and February 3,1997, Wolf Creek Nuclear Operating Corporation (WCNOC) submitted information pertaining to thermo-lag at the Wolf Creek Generating Station ,

(WCGS), which included responses to requests for additional info,mation pertaining to ampacity i derating issues. i The NRC staff, with assistance from its contractor, Sandia National Laboratories (SNL), has completed its review of your submittals. The results of the review are documented in the enclosed safety evaluation and the SNL Technical Letter Report, "A Technical Evaluation of the Wolf Creek Nuclear Operating Corporation Analysis of Fire Barrier Ampacity Derating Factors," dated December 20,1996. ,

l On the basis of its review, the staff has concluded that the ampacity derating analysis results are acceptable and there are no significant safety hazards associated with the application of l WCNOC's ampacity derating methodology at WCGS. You should retain all documentation i related to the resolution of the ampacity issue for future NRC audits or inspections.

If you have any questions regarding this matter, please contact me at (301) 415-1362. l Sincerely, ORIGINAL SIGNED BY:

Kristine M. Thomas, Project Manager Project Directorate IV-2 Division of Reactor Projects lil/IV Office of Nuclear Reactor Regulation Docket No. 50-482 DISTRIBUTION Docket File OGC,015B18 /

Enclosures:

1. Safety Evaluation PUBLIC WBateman

2. SNL Technical Letter Report PDIV-2 Reading EGA1 ACRS TLH1 (SE) g/ j cc w/enci: See next page WJohnson, RIV AKugler KThomas EPeyton RJenkins, EELB DOCUMENT NAME:WCTHLAG.LTR OFFICE PDIV-2/PM PDIV-2/LA NAME KMNas F.Mof DATE 04/fo /98 i 04/ 3 /98 l OFFICIAL RECORD COPY _ , . .

9804140367 980406 w ,M L t,.a w .a k st 2 b m &

PDR ADOCK 05000482 ,

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% April 6,1998 Mr. Otto L. Maynard i President and Chief Executive Of5cer p Wolf Creek Nuclear Operating Corporaton

' Post Office Box 411 l Burlington, Kansas 66839

SUBJECT:

SAFETY EVALUATION ADDRESSING THERMO-LAG RELATED AMPACITY DERATING ISSUES FOR THE WOLF CREEK GENERATING STATION

Dear Mr. Maynard:

By letters dated April 16,1993, February 9,1994, July 15,1994, December 22,1994, February 15,1995, March 10,1995, March 29,1995, June 27,1995, June 20,1996, August 2, 1996,' August 23,1996, and February 3,1997, Wolf Creek Nuclear Operating Corporation (WCNOC) submitted information pertaining to thermo-lag at the Wolf Creek Generating Station

! (WCGS), which included responses to requests for additonal information pertaining to ampacity

. dorating issues.

The NRC staff, with assistance from its contractor, Sandia National Laboratories (SNL), has completed its review of your submittals. The results of the review are documented in the enclosed safety evaluation and the SNL Technical Letter Report, "A Technical Evaluation of the Wolf Creek Nuclear Operating Corporation Analysis of Fire Barrier Ampacity Derating Factors,"

dated December 20,1996.

On the basis of its review, the staff has concluded that the ampacity derating analysis results are acceptable and there are no significant safety hazards associated with the application of .

WCNOC's ampacity derating methodology at WCGS. You should retain all documentation -

related to the resolution of the ampacity issue for future NRC audits or inspections, if you have any questions regarding this matter, please contact me at (301) 415-1362.

Sincerely, f4dxw MhWA Kristine M. Thomas, Project Manager Project Directorate IV-2 Division of Reactor Projects ill/IV Office of Nuclear Reactor Regulation Docket No. 50-482

Enclosures:

1. Safety Evaluation

2. SNL Technical Letter Report cc w/encli ~See next page L

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! Mr. Otto L Maynaro l l

cc w/ encl:

Jay Silberg, Esq. Chief Operating Offica Shaw, Pittman, Potts & Trowbridge Wolf 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. Nuclear Regulatory Commission U.S. Nuclear Regulatory Commission Resident inspectors Office 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 Govemor )

State of Kansas l Topeka, Kansas 66612 Attomey General

' Judicial Center 301 S.W.10th 2nd Floor l Topeka, Kansas 66612 County Clerk l 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 l

Topeka, Kansas 66620 ,

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