ML20099H646

Requests NRC Approval to Use ASME Code Case N-411 for Response Spectrum Seismic Analysis of Class 1 Reactor Vessel Head to Hot Leg Continuous Vent Line.Updated FSAR Will Be Amended to Reflect Change.Fee Paid

ML20099H646
Person / Time
Site:	Davis Besse
Issue date:	03/14/1985
From:	Crouse R TOLEDO EDISON CO.
To:	Stolz J Office of Nuclear Reactor Regulation
References
1129, TAC-57231, NUDOCS 8503190446
Download: ML20099H646 (2)

Text

e TOLEDO

%s EDISON Docket No. 50-346 IO((~

%cw License No. NPF-3 Serial No. 1129 March 14, 1985 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz Operating Reactor Branch No. 4 Division of Licensing United States Nuclear Regulatory Commission Washington, D.C. 20555

Dear Mr. Stolz:

Pursuant to 10 CFR 50.55a (a)(2)(ii) Toledo Edison hereby requests NRC

approval to use ASME Code Case N-411, Alternative Damping Values for Seismic Analysis of Piping, an alternative to Table N-1230-1 Appendix N of ASME Section III, Division 1, for the response spectrum seismic analysis of the Class 1 reactor vessel head to hot leg continuous vent line at the Davis-Besse Nuclear Power Station Unit No. 1. This continuous vent line is a new 2) inch diameter, Class 1 pipe line which was discussed in Toledo Edison's submittal to the NRC dated April 15, 1983 (Serial No.

935).

It is Toledo Edison's intention to utilize Code Case N-411 damping values for the response spectrum seismic analysis of this new line in lieu of the critical damping value of 0.5% currently specified in subsection 3.7.1.3 and Table 3.7-1 of the USAR for both the Operating Basis Earthquake (OBE) and Safe Shutdown Earthquake (SSE). The USAR will be revised to reflect this change in a subsequent Amendment to the USAR. The balance of USAR commitments concerning dynamic analysis of piping remains the same.

The vent line displacements will be checked to ensure that the displace-ments can be accommodated and that there will be no adverse interaction with adjacent structures, components and equipment.

Toledo Edison has completed a safety evaluation of this proposed use of Code Case N-411 and determined that this use does not constitute an p [0OJ unreviewed safety question per the criteria of 10 CFR 50.59. wi v1 3: AO B503190446 850314 ADOCK 05000346 fq g(04 PDR -

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THE TOLEDO EDtSON COMPANY EDIGON PLAZA 300 MADISON AVENUE TOLEDO, OHIO 43652

Dock 2t No. 50-346' o Licznsa Ns. NPF-3 Serial No. 1129-March 14, 1984 Page 2 Toledo Edison requests the NRC. issue its approval to use Code Case N-411 for the continuous vent line response spectrum seismic analysis by April 30, 1985.to support the Company's schedule.

Enclosed is a check for $150 as required by 10CFR170.12(c) for this review and approval.

Very truly yours, RPC:DRW:lah cc: DB-1 NRC Resident Inspector 0