ML20117K659

Withdraws Request for Approval of Crest Methodology

ML20117K659
Person / Time
Site:	Mcguire, Catawba, McGuire
Issue date:	09/03/1996
From:	Tuckman M DUKE POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
TAC-M91832, TAC-M91833, TAC-M91834, NUDOCS 9609120073
Download: ML20117K659 (2)

Text

,

Il I

^ DukelbwerCompany M.S Ttxxw PD BoxIW Senior Vice President

.Ounrlottek 28201-1006 NuclearGeneration

(704)382-2200 OWice 1

(704)3824360 Fax MM .

September 3, 1996 U. S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555

Subject:

Catawba Nuclear Station, Units 1 & 2, Docket Nos. 50-413 and -414 McGuire Nuclear Station , Units 1 and 2, Docket Nos. 50-369 and 370 Seismic Analysis Methodology l (TACs M91832, M91833, and M91834)

By letters dated March 16 and June 30, 1995, Duke Power Company requested approval for use of alternative seismic ,

methodologies. The three methodologies were CREST, Independent Support Motion (ISM), and coupled analysis of the reactor coolant loop piping. These more current methodologies ware needed for reanalysis of the main steam lines and other piping systems in conjunction with steam generator replacement at Catawba Unit 1, McGuire Unit 1 and

McGuire Unit 2.

l By letter dated September 20, 1995, we requested that the i

ISM methodology be approved in-the short term while the CREST review continued. The request to approve the coupled analysis of RCL piping was withdrawn at that time. On  ;

October 13, 1995, the NRC approved. Duke's use of the ISM l methodology.

The Catawba Unit 1 S/G replacement outage is nearly complete. The engineering work for the McGuire Units 1 and 2 S/G replacement. outages is nearing completion. Therefore, Duke no longer has an immediate need for use of the CREST l

methodology. Rather than utilizing NRC Staff and Duke Power resources to continue the review, Duke's request for approval of the CREST methodology is hereby withdrawn.

We continue to believe that the CREST methodology represents l a significant advance in seismic analysis and would like to

) ser the review completed under the sponsorship of another l organization or licensee. CREST was developed by the North 9609120073 960903 $

PDR ADOCK05000gg9 amo on ,.naw a,

~

U. S. Nuclear Regulatory Commiss:

September 3, 1996 Page 2 Carolina State University, Center for Nuclear Power Plant Structures, Equipment & Piping which is supported by eleven US nuclear utilities and seven other members, including foreign utilities and nuclear services companies. In addition, a number of non-member US utilities are interested in the application of the CREST methodology. We will work with the Center and other utilities to obtain NRC acceptance of CREST and research products that can improve the safety and cost effectiveness of nuclear power plants.

Please contact R. O. Sharpe at (704) 382-0956 if you have any questions.

Very truly yours,

f. b. -

M. S. Tuckman xc: S. D. Ebneter Regional Administrator, Region II U. S. Nuclear Regulatory Commission 101 Marietta Street, NW, Suite 2900 Atlanta, GA 30323 R. J. Freudenberger Senior Resident Inspector Catawba Nuclear Station S. M. Shaeffer Senior Resident Inspector McGuire Nuclear Station P. S. Tam Project Manager, ONRR V. Nerses Project Manager, ONRR L. N. Tran Project Manager, ONRR i