ML19289F472

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Responds to IE Bulletin 79-04, Incorrect Weights for Swing Check Valves Mfg by Velan Engineering Corp. Lists Subj Valves Used in Seismic Category I Piping Sys.Investigation Indicates No Drawing Discrepancies Re Valves
ML19289F472
Person / Time
Site: Millstone Dominion icon.png
Issue date: 04/30/1979
From: Counsil W
NORTHEAST UTILITIES
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
References
TAC-46174, NUDOCS 7906070412
Download: ML19289F472 (2)


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L J :::OOJ' O"/ l April 30, 1979 Docket No. 50-336 Mr. Boyce H. Grier Director, Region I Office of Inspection and Enforcement U. S. Nuclear Regulatory Commission King of Prussia, PA 19406 RE:

IE Bulletin No. 79-04, " Incorrect Weights For Swing Check Valve Manufactured by Velan Engineering Corporation", dated March 30, 1979, and received April 16, 1979.

Gentismen:

This is in response to the actions requested by the above referenced IE Bulletin No. 79-04. The individual responses which follow are numbered to correspond to the action statements in the bulletin.

1.

The Seismic Category I piping systems utilizing 3, 4, or 6 inch diameter Velan swing check valves are:

Valve #

Description System CH037 3" Sch. 10 Charging CHil8 4" Sch. 10 Charging CH154 3" Sch. 10 CH155 3" Sch. 10 CH177 3" Sch. 10 CH184 3" Sch. 10 CH188 3" Sch. 10 CH190 3" Sch. 10 CHl91 3" Sch. 10 2

23 CH193 3" Sch. 10 N000?DLf(3

..-s Mr. Boyce H. Grier Valve #

Description System CS0ll 4" Sch. 10 Containment Spray CS012 3" Sch. 10 Containment Spray SI008 6" Sch. 160 Safety Injection SIO50 3" Sch. 40 Safety Injection 2.

A review by Velan and the documented results furnished to the NSSS indicated that no drawing discrepancies regarding valve weights ever existed for Millstone Unit #2. As an example, valve SI008, a 1500# 6 inch valve, recommends a 450 pound weight. The weight used was 445 pounds.

3.

Not applicable.

4.

Not applicable.

5.

Not applicable.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPAfY

'h$'l W. G. Counsil Vice President 2232 124