ML19270G608

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Supplements 790414 Response to IE Bulletin 79-07.Submits Addl Info Re Computer Codes for Seismic Analysis
ML19270G608
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 05/15/1979
From: Wachter L
NORTHERN STATES POWER CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 7906140171
Download: ML19270G608 (2)


Text

4 MSp 79e swa e NORTHERN STATES POWER COMPANY M O N N E A POU S. MIN N E SOTA 35401 May 15, 1979 Mr James G Keppler Director - Region III Office of Inspection and Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear Mr Keppler:

PRAIRIE ISLAND NUCLEAR GENERATING PLANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60 Supplementary Information in Response to IE Bulletin No. 79-07 dated April 14, 1979 IE Bulletin 79-07 requested that we review the computer codes used for the seismic analysis of safety related piping systems and supply inf ormation concerning these codes. Our letter dated April 24, 1979 provided the requested information with the exception of some aspects of the verification of Fluor Power Services, Incorporated (FPSI) and Stone and Webster seismic analysis codes.

It has now been confirmed that algebraic summation of responses was not used in the ADLPIPE calculations used to verify the FPSI PIPESTRESS Code. Information concerning methods used to verify the Stone and Webster NUPIPE Code is now avail-able also. This supplementary information is being submitted as a revision to the table sent to you with our April 24, 1979 letter.

Please contact us if you require additional information concerning our response.

Very truly yours, L Wachter Vice President - Power Production and System Operation cc Mr G Charnoff NRC Office of Inspection and Enforcement Washington, DC 17 f979 Attachment 790614017 l 1

Attachment - .

L J Wachter, NSP, to Director, IE III May 15, 1979 Computer Codes Used for Seismic Analysis of Safety Related Piping Systems at the Prairie Island Nuclear Generating Plant Organization Code Name and Source Algebraic Summation Method of Code Verification Used?

Westinghouse Electric Corp WESTDYN - Westinghouse No Documentation of code verification was provided to the NRC in topical report, WCAP-8252, Revision 1.

Stone and Webster NUPIPE - 3/10 - Stone & Webster No Verified by hand calculation, using internal Stone & Webster problems.

Currently being verified against Brookhaven EPIPE Code.

Fluor Power Se rvices, Inc PIPESTRESS - Fluor Power No Verified using ADLPIPE with Services square root of sum of squares response combination.

ADLPIPE - subcontracted to Note 1 Nuclear Services Corp using A D Little Program.

N N

N CD CD Os Notes:

1. ALDPIPE was originally used in the analysis of one safety injection line in Unit No. 1. A review of available documentatio indicated that we could not rule out the possibility that algebraic summation was used. This analysis was repeated using PIPESTRESS. The new analysis confirmed the adequacy of the original design.