ML19225C784

Forwards 790410 B&W 1977 Fuel Assembly Owners' Group Asymmetric LOCA Loads Evaluation Program,Phase 2. Summarizes Program Started in Response to NRC 780120 Request.Conclusions Will Be Available Jul 1980

ML19225C784
Person / Time
Site:	Davis Besse
Issue date:	07/26/1979
From:	Roe L TOLEDO EDISON CO.
To:	Reid R Office of Nuclear Reactor Regulation
Shared Package
ML19225C785	List: ML19225C784 ML19225C786
References
REF-GTECI-A-02, REF-GTECI-RV, TASK-A-02, TASK-A-2, TASK-OR 528, NUDOCS 7908020442
Download: ML19225C784 (2)

Text

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Docket No: 50-346 License No: NPF- 3 Serial No: 528 July 26, 1979 D-irector Of Nuclear Reactor Regulation Attn: Mr. Robert N. Reid, Chief Operating Branch No. 4 Division of Operating Reactors Of fice of Nuclear Reactor Regulation U. S. Nuclear Begulatory Commission Washington, D.L. 20555 Ref: BAW-1538, Rev. 1 " Assumptions, !!ethodology, and Acceptance Criteria Report for Asymmetric LOCA Loads Evaluation," transmitted in letter of July 16, 19 79, J. H. Taylor, S . B. Hosford, NRC.

Dear Mr. Reid:

The Toledo Edison Company has been pursuing a multiphase program to evaluate the effects of asy=netric LOCA loads at Davis-Besse Nuclear Power Station Unit 1 (DS-1) as a participant in the B&W 177 ?A Owners Group in response to the NRC letter dated January 20, 1978 from Victor Stello.

Phase 1 conclusions were presented earlier to the NRC Staff at a December 12, 1978 meeting and at the same time an outline for Phase 2 was presented for NRC staf f review. The te rmination dare for Phase 2 at that time was identified as mid-March, 1980. The purpose of this letter is to advise you in a delay in the Phase 2 program ccepletion. The new completion date is July, 1980. We also wish to confirm that seismic loads will not be combined with LCCA loads during Phase 2. This, also, was previously discussed with the NRC staff ir. the aforementioned meeting.

If you desire to review the progress of Phase 2 and/or have any questions concerning the exteaded schedule completion. a meeting can be scheduled f'r August 8, 1979 at the Babcock and Wilcox Company of fice in Lynchburg,

'lir ginia . At the same time, we can also review with you 3NW-15 38, Rev. 4 0

7 i transmitted by the reference letter. That document, as titled, cuttines 07 1

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the methodology and assumptions applicable to our Phase 2 program.

Attached is a copy of the B&W report entitled "B&W 177 FA Owners Group Asymmetric LOCA Loads Evaluations Program, Phase 2", dated April 10, 1979 which defines the Phase 2 program. As mentioned,the conclusions will not be available until July,1980 in lieu of April, 1980 stated on page 7 of the report.

Please advise Mr. Lou Lanese, GPU, if you cesire the meeting on August 8, 1979.

If you have any questions, please contact Mr. Lou C. Lanese,. GPU Service Corp., for questions related to the Owners Group program, or Mr. Charles R. Domeck of my staf f for specific questions related to DB-1.

Very truly yours, C&2 f LER:JTJ cc: S. B. Hosford, Task Manager (A-2)

Engineering Branch, Division of Operating Reactors V. S. Noonan Attachments ca c/1-1B 45'6 n':9