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)


Text

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L 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 "

CH193 3" Sch. 10 " 2 23 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