ML19211C502

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Submits Corrections to 790803 Rept on Seismic Reanalyses of Safety-Related Piping Sys, Revision 4.Nine Computer Problems Exist for Which SHOCK-II Run Is Run of Record for Some Pipe Supports.Reanalyzing Problem
ML19211C502
Person / Time
Site: Beaver Valley
Issue date: 01/03/1980
From: Carey J
DUQUESNE LIGHT CO.
To: Schwencer A
Office of Nuclear Reactor Regulation
References
TAC-42636, NUDOCS 8001110539
Download: ML19211C502 (1)


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e January 3, 1980 Director of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn: A. Schwencer, Chief Operating Reactors Branch No. 1 Division of Operating Reactors Washington, DC 20555

Reference:

Beaver Valley Power $tation, Unit No. 1 Docket No. 50-334 Seismic Reanalysis of Piping Systems Gentlemen:

In our " Report on the Seismic Reanalyses of Safety Related Piping Systems for Beaver Valley, Unit No. 1", Revision 4, dated August 3, 1979, we stated that no piping systems of 6" or less in size had been analyzed using a SHOCK II subroutine as the run of record. We stated in this report that all piping runs of these sizes had been hand calculated.

We have determined that this statement was not entirely correct.

A total of nine computer problems have been found to exist for which the SHOCK II run is the run of record for some of the pipe supports included in these problems.

We are proceeding to reanalyze these problems using the NUPIPE computer program.

We will provide you with an update to the original report which will discuss the results of the reanalyses of these problems and will identify additional modifications, should any be determined to be necessary.

Sincerely, r

[G J . J . Ca re;-

Directar of Nuclear Operations Power Stations Department JJC:krg

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