ML20050N448

Forwards Info on SEP Topic III-2 Re Wind & Tornado Loadings, for Inclusion in Sar.Loading Combinations Should Have Explicit Entries for All Wind & Tornado Effects,Including Dynamic & Differential Pressures & Missile Impact Loads

ML20050N448
Person / Time
Site:	Big Rock Point File:Consumers Energy icon.png
Issue date:	04/12/1982
From:	Crutchfield D Office of Nuclear Reactor Regulation
To:	Vandewalle D CONSUMERS ENERGY CO. (FORMERLY CONSUMERS POWER CO.)
References
TASK-03-02, TASK-3-2, TASK-RR LSO5-82-04-031, LSO5-82-4-31, NUDOCS 8204140346
Download: ML20050N448 (5)

Text

N April 12,1982 Docket No. 50-155 s

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Mr. David J. VandeWalle 9

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SUBJECT:

SEP TOPIC III-2, WIND AflD TORNADO LOADINGS BIG ROCK POINT On February 3,1982, we sent you a copy of the lead topic evaluation performed on SEP Topic III-2 for the Ginna facility.

In that letter, we described the appmach taken to resolve this SEP topic.

We assume you will be taking the same approach.

To insure an adequate Safety Analysis Report (SAR), the information in the enclosure should be included in your SAR.

Sincerely, Dennis M. Crutchfield, Chief Operating Reactors Branch No. 5 Division of Licensing S *0 I 6

Enclosure:

As stated

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.Mr. David J. VandeWalle

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cc Mr. Paul A. Pe' ry, Secretary U. S. Environmental Protection r

Consumers Power Company Agency 212 West Michigan Avenue Federal Activities Branch Jackson, Michigan 49201 Region V Office ATTN:

Regional Radiation Representative Judd L. Bacon, Esquire 230 South Dearborn Street Consumers Power Company Chicago, Illinois 60604 212 West Michigan Avenue

_Jackson, Michigan 49201 Peter B. Bloch, Chairman Atomic Safety and Licensing Board Joseph Gallo, Esquire U. S. Nuclear Regul.atory Commission Isham, Lincoln & Beale Washington, D. C.

20555

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1120 Connecticut Avenue Room 325 Dr. Oscar H. Paris Washington, D. C.

20036 Atomic Safety and Licensing Board U. S. Nuclear Regulatory Commission Peter W. Steketee, Esquire Washington, D. C.

20555 505 Peoples Building Grand Rapids, Michigan 49503 Mr. Frederick J. Shon Atomic Safety and Licensing Board Alan S. Rosenthal, Esq., Chairman U. S. Nuclear Regulatory Commission Atomic Safety & Licensing Appeal Board Washington, D. C.

20555 U. S. Nuclear Regulatory Commission Washington, D. C.

20555 Big Rock Point Nuclear Power Plant ATTN:

Mr. C. J. Hartman Mr. John O'Neill, II Plant Superintendent Route 2, Box 44' Charlevoix, Michigan 49720 Maple City, Michigan 49664 Christa-Maria Mr. Jim E. Mills Route 2, Box 108C Route 2, Box 108C Charlevoix, Michigan 49720 Charlevoix, Michigan 49720 William J. Scanlon, Esquire Chairman 2034 Pauline Boulevard County Board of Supervisors Ann Arbor, Michigan 48103 Charlevoix County Charlevoix, Michigan 49720 Resident Inspector.

Big Rock Point Plant Office of the Governor (2) c/o U.S. NRC Room 1 - Capitol Building RR #3, Box 600 Lansing, Michigan 48913 Charlevoix, Michigan 49720 Herbert Semmel Counsel for Christa Maria, et al.

Urban Law Institute Antioch School of Law 263316th Street, NW Washington, D. C.

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Mr. David J. VandeWalle cc Dr. Johr. H. Buck Atomic Safety and Licensing Appeal Board U. S. Nuclear Regulatory Commission

• Washington, D. C.

20555 Ms. JoAnn Bier 204 Clinton Street Charlevoix, Michigan 49720' Thomas S. Moore Atomic Safety and Licensing Appeal Board

. U. S. Nuclear Regulatory Commission Washington, D. C.

20555 James G. Keppler, Regional Administrator Nuclear Regulatory Commission, Region III 799 Roosevelt Road Glen Ellyn, Illinois 60137 G

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ENCLOSURE The information below should be included in your SAR on SEP Topic III-2.

1.

The criteria used for calculating the applied loadings.

Note any modifications to these loadings in specific applications.

The criteria should be according to SRP 3.3.1 and 3.3.2.

2.

The loading combinations used in the structural analysis.

Combina-tions should have explicit entries for all wind and tornado effects, including dynamic pressures, differential pressures and missile impact loads.

3.

The structurel acceptance criteria applied to steel and concrete structures.

Where the criteria differ from SRP 3.8.2 and 3.8.4, the basis should be identified.

Also, structural acceptance criteria should be identified for structural details such as mason'y walls or aluminum sided structures.

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Provide a tornado analysis for all Category I structures and structures whose failure could affect those that are Category I.

The analysis should identify limiting structural elements and the load combinations, differential pressure capacity, and wind velocities at which these elements fail.

Provide sample calculations to support your conclusions.

Calculations should be supplied for the chimney and spherical steel containment vessel.

The following list of structures are of interest (the list is not.

intended to exclude other applicable structures):

a'.

Steel containment vessel (strength of vessel steel and weld seams,).

b.

Concrete chimney (including foundation).

c.

Emergency diesel generator room.

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Control room (the supporting section below it, walls, roof, and partition on the south side along column line 5).

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Other structures such as the demineralized water storage tank, liquid radwaste vaults, radwaste hold tanks, other exterior tanks important to safety.

f.

Structural details such as siding, girts, exposed masonry walls.

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5.

Provide a description of the original wind design as compared to the latest ANSI A58.1 code for a 100 year return period wind.

The descrip-tion should include other loads (e.g., snow) that were considered in combination with the wind, gust factors considered, variation of load with height, and structural acceptance criteria.

The need for this description is that wind loads are combined with loads that are different than those combined with tornado loads.

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