ML20206G496

Forwards Request for Addl Info Re Allegation Concerning Adequacy of Pipe Whip Restraint Design for B&W Designed Plant Which May Also Apply to Davis-Besse Plant.Response Requested within 45 Days of Ltr Date

ML20206G496
Person / Time
Site:	Davis Besse
Issue date:	05/16/1986
From:	Stolz J Office of Nuclear Reactor Regulation
To:	Williams J TOLEDO EDISON CO.
References
TAC-40076, NUDOCS 8606250323
Download: ML20206G496 (3)

Text

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May 16,1986 Docket No.'50-346 Mr.' Joe Williams, Jr.

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Senior Vice President, Nuclear Toledo Edison Company Edison Plaza - Stop 712 300 Madison Avenue Toledo, Ohio 43652

SUBJECT:

Pipe Whip Restraint Design for the Davis-Besse Nuclear Power Station The NRC staff has received an allegation regarding the adequacy of the pipe whip restraint design for a B&W designed plant which may also apply to the Davis-Besse plant. The allegation relates to (1) the load combinations used in the design and analysis of reactor coolant hot leg restraints; and (2) the spring rates of connections of pipe whip restraints to the secondary shield wall.

The staff finds that your response to the enclosed request for additional information is needed to complete our review of this issue. Please provide your response within 45 days of the date of this letter.

The reporting and/or.recordkeeping requirements of this letter affect fewer than ten respondents; therefore, OMB clearance is not required under P.L.96-511.

Sincerely, 913C u:15 my,.

LWEe Qe,, 5 John F. Stolz, Director PWR Project Directorate #6 i

Division of PWR Licensing-B

Enclosure:

Request for Additional Information cc w/ enclosure:

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r Mr. J. Wil? isms Davis-Besse Nuclear Power Station Toledo Edison Company Unit No. I cc:

Donald H. Hauser, Esq. Ohio Department of Health.

The Cleveland Electric ATTN: Radiological Health Illuminating Company Program Director P. O. 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. (Addressee Only)

Shaw, Pittnan, Potts Division of Power Generation and Trowbridge Ohio Department of Industrial Relations 1800 M Street, N.W. 2323 West 5th Avenue Washington, D.C. 20036 P. O. Box 825 Columbus, Ohio 43216 Mr. Paul M. Smart, President Mr. Harold Kohn, Staff Scientist Toledo Edison Company Power Siting Commission 300 Madison Avenue 361 East Broad Street Toledo, Ohio 43652 Columbus, Ohio 43216 Mr. Robert B. Borsum President, Board of Babcock & Filcox County Commissioners of Nuclear Power Generation Ottawa County Division .

Port Clinton, Ohio 43452 Suite 200, 7910 Woodmont Avenue Bethesda, Maryland 20814 Resident Inspector U.S. Nuclear Regulatory Commission 5503 N. State Route 2 Oak Harbor, Ohio 43449 i Regional Administrator, Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, Illinois 60137 l

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f Enclosure

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RE00EST FOR ADDITIONAL-INFORMATION

1. Describe the load combinations that were used in the design and analysis of reactor coolant hot leg pipe whip restraints. Specifically, indicate if the load combinations included the consideration of

a. loads from jet impingment and compartment pressurization of the secondary shield wall,

b. seismically induced displacement of the secondary shield wall.

2. Describe how the spring rates of connections of pipe whip restraints to-the secondary shield wall were computed.

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j 3. Describe the allowable stress or strain used in your design.

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