ML19257A933

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Advises That Baseplate Evaluations Per IE Bulletin 79-02 Revealed Two & One half-inch to six-inch Piping Designed for Loads Derived from SHOCK-2 Computer Calculations
ML19257A933
Person / Time
Site: Beaver Valley
Issue date: 01/03/1980
From: Kennedy W L
STONE & WEBSTER, INC.
To: Harold Denton
Office of Nuclear Reactor Regulation
References
IEB-79-02, IEB-79-2, TAC-42636, NUDOCS 8001090426
Download: ML19257A933 (1)


Text

STONE 6 WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET, BOSTON. M ASS ACHUSETTS ADDRESS ALL CORRESPONDENCE TO P.O. SOK 2325. SOSTON. M ASS. 02107 SOST C Na t.UCTION NoustoN A ns ATIONS EI' '.".* *'" * "'.OEc".*N.

N EE*IN$.T." 'oM Mr. Harold Denton January 3, 1980 Director Office of Nuclear Reactor Regulation U. S. Nuclear Regulatory Commission Washington, D. C. 20555

Dear Sir:

During the process of collecting pipe support loads for use in the IE Bulletin 79-02 Baseplate Evaluations, it came to our attention that some of the pipe supports on 2 1/2 to 6 inch piping on the Beaver Valley 1 Power Station are designed for loads that were derived from Shock 2 Computer calculations.

It had previously been thought that the calculations of record for these supports were simplified manual calculations.

In response to the telephone request by your Messrs. Wigginton and Wychman, we have obtained the following information with respect to the other projects that were affected by the March 13, 1979 Order to Show Cause:

Surry 1 and 2 -

No Shock 2 computer runs were identified in connection with 6 inch and under piping.

Maine Yankee - There were a number of Shock 2 runs identified in connection sith 6 inch and under piping and all were reanalyzed as a part of the Show Cause reanalysis.

J. A. FitzPatrick- There were no Shock 2 runs identified in connection with 6 inch and under piping.

We do not believe that there are any safety implications from this finding since previous reanalysis of Shock 2 calculations did not result in any significant changes.

Very rul yo s, g, g rec t of inee ng 5 lO 1708 015 80010904 M

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