ML20134M063

Approves Util 850702 Commitments Re Use of ASME Code Case N-411, Alternative Damping Values for Seismic Analysis of Piping - Section III Div 1 Class 1,2 & 3 Const, for Response Spectrum Seismic Analysis of Selected Piping

ML20134M063
Person / Time
Site:	Davis Besse
Issue date:	08/26/1985
From:	Harold Denton Office of Nuclear Reactor Regulation
To:	Williams J TOLEDO EDISON CO.
References
TAC-59225, NUDOCS 8509030524
Download: ML20134M063 (4)

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August 26, 1985 Docket No. 50-346 DISTRIBUTION JDocket FUa;r , JPartlow HThompson NRC PDR" " ACRS-10 DEisenhut L PDR RIngram HDenton Mr. Joe Williams, Jr. ORB #4 Rdg ADeAgazio Vice President, Nuclear HThompson Gray File Toledo Edison Company OELD EBrach Edison Plaza - Stop 712 EJordan H0rnstein 300 Madison Avenue BGrimes RKirkwood Toledo, Ohio 43652 FCherney RBosnak

SUBJECT:

USE OF ASME CODE CASE N-411 Toledo Edison Company has requested NRC approval to use ASME Code Case N-411 for response spectrum seismic analysis of selected piping at the Davis Besse Nuclear Power Station; Unit No.1 (Toledo Edison Company letter July 2,1985 (No. 1163)). This request is similar to an earlier reouest for approval to use Code Case N-411 for the continuous vent line response spectrum seismic analysis (Toledo Edison Company letter March 14, 1985 No. 1129)). That earlier request was approved April 15, 1985.

As we stated in our letter of April 15, 1985, Code Case N-411. " Alternative Damping Valves for Seismic Analysis of Piping - Section III Division 1 Class 1, 2, and 3 Construction," is a conditionally acceptable Code Case pending revision of Regulatory Guide 1.61. Utilities electing to apply this code case must comit to the following:

(a) Use the case for piping systems analyzed by response spectrum methods and not those using time-history analysis methods.

(b) Due to the increased flexibility of the system, check all system predicted maximum displacements for adequate clearance with adjacent structures, components and equipment, and that the mounted equipment can withstand the increased motion.

(c) When the alternate damping criteria of this Code Case are used, they will be used in their entirety in a given analysis and shall not be a mixture of Regulatory Guide 1.61 criteria and the alternate criteria of this Code Case.

Since the commitments with respect to your use of Code Case N-411, as documented in your July 2,1985, letter comply with those required by the staff, we find your request to use Code Case N-411 for new analyses or for reconciliation work and for support optimization to be acceptable for use at the Davis-Besse Nuclear Power Station, Unit 1.

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Mr. Williams In addition, we find your commitment acceptable to revise the USAR in subsequent amendments to reflect all applications of Code Case N-411.

Sincerely, origint! s!;nM M Harold R. Denton, Director Office of Nuclear Reactor Regulation cc: See next page D:DL DD: D[

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Mr. Williams . .the Davis-Besse Nuclear Power Station, Unit 1.

In addition, we find your commitment acceptable to revise the USAR in subsequent amendments to reflect all applications of Code Case N-411.

Harold R. Denton, Director Office of Nuclear Reactor Regulation cc:- See next page l

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Mr. J. Williams Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. 1 CC:

Donald H. Hauser, Esq. Ohio Department of Health

.The Cleveland Electric ATTN: Radiological Health Illuminating Company Program Director

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P. 0 -Box 5000 P. O. Box 118 Cleveland, Ohio 44101 Columbus, Ohio 43216 Mr. Robert F. Peters Attorney General Manager, Nuclear Licensing Department of Attorney Toledo Edison Company General Edison Plaza 30 East Broad Street 300 Madison Avenue Columbus, Ohio 43215 Toledo, Ohio 43652 Mr. James W. Harris, Director Gerald Charnoff, Esq. Division of Power Generation Shaw, Pittman, Potts Ohio Department of Industrial Relatinns and Trowbridge 2323 West 5th Avenue 1800 M Street, N.W. P. O. Box 825 Washington, D.C. 20036 Columbus, Ohio 43216 Paul'M. Smart, Esq. Mr. Harold Kahn, Staff Scientist Fuller & Henry Power Siting Commission 300 Madison Avenue 361 East Broad Street P. O. Box 2088 Columbus, Ohio 43216 Toledo, Ohio 43603 Mr. Robert B. Borsum President, Board of Babcock & Wilcox Ottawa County Nuclear Power Generation Port Clinton, Ohio 43452 Division Suite 200, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector U.S. Nuclear Pegulatory Commission 5503 N. State Route 2 Oak Harbor, Ohio 43449 Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road n Glen Ellyn, Illinois 60137 4

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