ML19225A365

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Responds to IE Bulletin 79-07.No Computer Codes for S&W Seismic Analysis of safety-related Piping Use Item 1 Methods.Verification of Nupipe 03/10 Program Version Being Addressed
ML19225A365
Person / Time
Site: Millstone Dominion icon.png
Issue date: 05/30/1979
From: Counsil W
NORTHEAST UTILITIES
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
AEC-MP3-183, NUDOCS 7907190090
Download: ML19225A365 (1)


Text

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May 30, 1979 United States Nuclear Regulatory Commission Office of Inspection and Enforcement Region I 631 Park Avenue.

King of Prussia, Pennsylvania 19406 ATTN: Mr. B. H. Grier, Director Docket No. 50-423 AEC-MP3-183 Gentlemen:

SUBJECT:

Millstone Unit No. 3 I.E. Bulletin No. 79-07 Reference (1): B. H. Grier letter to W. G. Counsil dated April 14, 1979.

Reference (1) transmitted the subject I.E. Bulletin to Northeast Nuclear Energy Company requesting appropriate action. The resulting investigation has shown, in response to Items 1, 2 and 4, that none of the computer codes used in the seismic analysis of safety related piping by Stone & Webster Engineering Corporation on Millstone Unit 3 use any of the methods described in Item 1 of the subject bulletin.

In response to Item 3, Stone & Webster is using NUPIPE versions 02/05 through 03/10 in the seismic stress analysis of Millstone Unit 3 safety related piping.

Verification of the NUPIPE 03/10 version of the program is presently being addressed by Stone & Webster to the NRC in response to the April 2 Addendum to the March 13, ND" Order to Show Cause for Surry Units 1 and 2, Maine Yankee, Beaver Valley 1 and James A. Fitzpatrick Nuclear Power Stations. Stone & Webster in-house bench marking links all major versions of NUPIPE to version 03/10.

Very truly yours, NORTHEAd f NUCLEAR ENERGY COMPANY s/

  • W. G. Counsil Ul44UL '

Vice President Nuclear Engineering & Operations cc: Nuclear Regulatory Commission Office of Inspection and Enforcement Division of Reactor Operations Inspection .

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Washington, D. C. 20555 i40 700719007o