ML20196K767

Confirms Actions Agreed to During 880518 Meeting W/Nrc Re Pra.Util Will Provide Summary Document to NRC by 880830, Including Rationale for Concluding That Revised PRA Will Conservatively Reflect Configuration of Unit 2 at Restart

ML20196K767
Person / Time
Site:	Browns Ferry
Issue date:	06/28/1988
From:	Gridley R TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
TAC-63178, NUDOCS 8807070110
Download: ML20196K767 (2)

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TENNESSEE VALLEY AUTHORITY CHATTANOOGA. TENNESSEE 374ol SN 157B Lookout Place (JtlN 281988 U.S. Nuclear Regulatory Commission ATTN: Document Control Desk Washinsi.on, D.C. 20555 Gentlemen:

In the Matter of ) Docket Nos. 50-259 Tennessee Valley Authority ) 50-260 50-296 BROWNS FERRY NUCLEAR PLANT (BFN) - PROBABILISTIC RISK ASSESSMENT (PRA)

References:

1. G. E. Gears's summary of May 13, 1988 meeting with the Tennessee Valley Authority dated May 27, 1988

2. S. A. White's letter to NRC dated June 9, 1987

3. R. M. Bernero's letter to S. A. White dated August 15, 1986 This letter is to confirm actions agreed to during TVA's May 18, 1988 meeting with the NRC staff on the BFN PRA. As stated in NRC's meeting summary (reference 1), the Staff's major concern for Unit 2 restart is whether the BFN plant is an outlier in terms of core melt frequency when compared to similar plants of similar vintage. To address this concern TVA hereby confirms the commitments made in the May 18, 1988 meeting to provide a summary document to the NRC by August 30, 1988 which:

a. Provides the rr.tionale for concluding that the revised PRA will conservati'ealy reflect the configuration of Unit 2 at the time of restart,

b. Summarizes the changes made between the January 1986 draft PRA reviewed by the staff in its October 1, 1987 letter and the September 1987 versien. '

As indicated by NRC in reference 1, the development of NRC guidance concerning the performance of an Individual Plant Examination (IPE) is still underway.

Based on discussions with NRC-OSP management on this subject during the May 18, 1983 meeting in Rockville, Maryland, an agreement was reached that the j commitment by TVA in reference 2 to apply the IDCOR Individual Plant Evaluation Methodology (IPEM) to BFN prior to unit 2 restart is no longer considered appropriato by NRC. This commitment was made by TVA in response to issues to BFN severe accident characteristics discussed in reference 3.

By this letter, TVA f ormally withdraws the IDCOR IPEd application commitment made to the NRC in reference 2. Restert issues related to BFN severe accident characteristics will be satisfied by submittal of the above information, n

8807070110 880628 PDR ADOCK 05000259 al h P

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PDC g An Equal Opportunity Employer v

1 U.S. Nuclwar Regulatory Commission Enclosed is a list of commitments made by TVA in this submittal. If you have any questions, please call D. L. Willians at (615) 632-7170.

Very truly yours, TENNESSEE VALLFY AUTil0RITY R. Cridley, Dir ctor Nuclear Licenslug and Regulatory Affairs cc: Mr. F. McCoy, Arsistant Director for Inspection Prograns TVA Projects Division U.S. Nuclear Regulatory Commission Region 11 101 Mariotta Street, NW, Suito 2900 Atlanta, Coorgia 30323 Ms. S. C. Black, Assistant Director for Projects TVA Projects Division U.S. Nuclear Regulatory Commission one White Flint, North 11555 Rockvillo Piko Rockvillo, Maryland 20852 Browns Ferry Resident Inspector Browns Ferry Nuclear Plant Route 12, P.O. Box 637 Athens, Alabama 35611 l

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