ML20203F695

Forwards Request for Addl Info on Allegations Re Adequacy of Pipe Whip Restraint Design,Load Combinations Used in Design & Analysis of Reactor Coolant Hot Leg Restraints & Spring Rates

ML20203F695
Person / Time
Site:	Midland
Issue date:	03/12/1986
From:	Berkow H Office of Nuclear Reactor Regulation
To:	Jackie Cook CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
NUDOCS 8604250238
Download: ML20203F695 (3)

Text

March 12,1986 1.

Dockets Nos. 50-329 and 50-330 Mr. J. W. Cook, Vice President Consumers Power Company 1945 West Parnall Road Jackson, Michigan 49201

SUBJECT:

PIPE WHIP RESTRAINTS DESIGN FOR MIDLAND NUCLEAR PLANT, UNITS 1 AND 2 The NRC staff has received an allegation regarding the adequacy of the pipe whip restraint design for Midland Units 1 and 2 and an assertion that this issue may apply to other B&W designed plants. 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 allegation. Please provide your response within 45 days of the date of this letter.

Sincerely, MM Herbert Berkow, Director Standardization and Special Projects Directorate Division of PWR Licensing-B

Enclosure:

Request for Additional Information cc w/ enclosure:

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Mr. J. W. Cook Consumers Power Company Midland Nuclear Plant CC' Michael I. Miller, Esq.

Mr. Don van Farrowe, Chief Ronald G. Zamarin, Esq.

Division of Radiological Health Alan Si Farnell, Esq.

Department of Public Health Isham, Lincoln & Beale P. O. Box 33035 Three First National Plaza, Lansing, Michigan 48909 Sist floor Chicago, Illinois 60602 Mr. Steve Gadler 2120 Carter Avenue James E. Brunner, Esq.

St. Paul, Minnesota 55108 Consumers Power Company 212 West Michigan Avenue Ms. Barbara Stamiris

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Jackson, Michigan 49201 5795 N. River 8

Freeland Michigan 48623 Ms. Mary Sinclair 5711 Summerset Drive Mr. Tom McNish, Secretary Midland, Michigan 48640 Consumers Power Company 212 W. Michigan Avenue Stewart H. Freeman Jackson, Michigan 49201 Assistant Attorney General State of Michigan Environmental Mr. Walt Apley Protection Division c/o Mr. Max Clausen 720 Law Building Battelle Pacific Northwest Labs Lansing, Michigan 48913 (PNWL)

SIGMA IV Building Mr. I. Charak, Manager Battelle Blvd.

NRC Assistance Project Richland, Washington 99352 Argonne National Laboratory 9700 South Cass Avenue Mr. R. B. Borsum Argonne, Illinois 60439 Nuclear Power Generation Division Babcock & Wilcox Regional Administrator, Region :11 7910 Woodmont Avenue, Suite 220 U.S. Nuclear Regulatory Commission, Bethesda, Maryland 20814 799 Roosevelt Road Glen Ellyn, Illinois 60137 Cherry & Flynn Suite 3700 Ms. Julie Morrison Three First National Plaza Midland Daily News Chicago, Illinois 60602 124 Mcdonald Street Midland, Michigan 48640 Mr. Ron Callen Michigan Public Service Commission Billie Pirner Garde 6545 Mercantile Way Director, Citizens Clinic P. O. Box 30221 for Accountable Government Lansing, Michigan 48909,

Government Accountability Project Institute for Policy Studies Mr. Howard Levin, Project Manager 1901 Que Street, N.W.

TERA Corporation Washington, D. C.

20009 7101 Wisconsin Avenue Ms. Lynne Bernabei Government Accountability Project 1901 Q Street, N.W.

Washington, D.C.

20009

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Enclosure REQUEST 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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3.

Describe the allowable stress or strain used in your design.

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