ML18114A569

Notifies That Review of Computer Deck Is Completed.Shock 0 Program Still Unrecovered.Piping Sys Conservatively Designed & Will Perform Intended Function

ML18114A569
Person / Time
Site:	Beaver Valley, Surry, Maine Yankee
Issue date:	05/11/1979
From:	William Kennedy STONE & WEBSTER ENGINEERING CORP.
To:	Stello V Office of Nuclear Reactor Regulation
References
NUDOCS 7905160335
Download: ML18114A569 (1)

Text

,.,

STONE

& WEBSTER ENGINEERING CORPORATION 245 SUMMER STREET, BOSTON, MASSACHUSETTS ADDRESS ALL CORRESPONDENCE TO P.O. BOX 2325. BOSTON, MASS, 02107 DESIGN NEW YORK CONSTRUCTION BOSTON REPORTS CHICAGO HOUSTON May 11, 1979 EXAMINATIONS CONSULTING DENVER ENGINEERING CHERRY HILL, N.J.

PORTLAND, OREGON Sb- 2reo/2~(

Mr. Victor Stello, Jr., Director 5"0 -30~ _ -

Division of Operating Reactors ~ - 73'{

Office of Nuclear Reactor Regulation U.S. Nuclear Regulatory Commission 5 33'f Washington, D.C. 20555

Dear Mr. Stello:

Review of the computer deck referenced in my May 9 letter has been completed.

That deck is not the SHOCK O program; it is a pre-liminary SHOCK-series development deck and was not used, to the best of our knowledge, on any production design effort associated with the Maine Yankee or Surry stations.

Thus, the SHOCK O program is still unrecovered.

The development deck does, however, provide some insight into what may have been elements of SHOCK O. Assuming that some elements of the development deck were used in SHOCK O, certain anomalies could have occurred in SHOCK O results.

These relate to eigenvalue and participation factor deter-mination.

Subsequent versions (such as SHOCK 1, 2, and 3) do not evidence any such anomalies.

Since the continued absence of a SHOCK O program deck or listing prevents verification of the above assumption, we have already rerun a number of SHOCK O stress problems with SHOCK 1. The results indicate that the piping systems are conservatively designed-and will perform their iptended function. Additional reruns are still underway.

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J. L. Kennedy Vice President y""oo\

Copy to John G~ Davis, Acting Director Office of Inspection & Enforcement ~

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