ML19290C683

RO 80-02/01T-0:during Review Required by IE Bulletin 79-14, Stress Discovered Over Design Allowable on Pipe Hangers & Snubbers.Caused by Incorrect Valve Weights Used in Design Calculations.Hangers & Snubbers Will Be Modified

ML19290C683
Person / Time
Site:	North Anna
Issue date:	02/04/1980
From:	VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
References
IEB-79-14, NUDOCS 8002040554
Download: ML19290C683 (1)

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{1 Yirginia Electric and Pcwah Co:panyO n

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t North Anna Pcher Statica. Unit 11. 'NPF-4 { Dccket No. 50-338 1' , I 24 ifaur Reportable Event . k Eritten Fo11cw Up - 1 Event: Nonconfornances in Pipe. Support' Design - 1.ER/R0 80-02/01T-0 ' l l

.                           During the review. required by IE Bulletin 79-14. of sets.nic' analyses for as-built safety related piping systems. Stone & liebster discovered the stress an pipa hangers RH-R-19 and liS-R-316 and snubters SI-HSS-1018.101C.

and 107A to he over design allevable. These nonconformances affect the suction and discharge of the'RRR pu::.ps the discharga of "B" SI accumula-tar, and the service watar makeup line from the screen wash ptaps.

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The pipa supports are o'v erstressed because incorrect valve wights w re used in the design calculations. There has been no affect on the plant as a result of these discrepancies. The hangers and sr.iJhhers will. ha modified or reinforced a,s required. The unit'is presently in Mode 5 folicwing a refueling shutdcwn.

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