ML19305D847

Supplemental LER 79-002/03X-1:on 791207,during Repairs to Buffer Helium Purge Valve,Operation in Degraded Mode Occurred.Caused by Bypass of Buffer Helium Dryer for Repair of Valve

ML19305D847
Person / Time
Site:	Fort Saint Vrain
Issue date:	04/09/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19305D834	List: ML19305D833 ML19305D847
References
LER-79-002-03X-01, LER-79-2-3X-1, NUDOCS 8004150611
Download: ML19305D847 (1)

Text

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Io12l l On January 27, 1979, operation in a degraded mode of LCO 4.2.10 and LCO 4.2.11 re- l1 i o ,3, g sulted during repairs to a buffer helium purge valve. Operation in a degraded mode I; lo l4l l of LCO 4.2.10 again occurred on January 29 and January 30. 1979. during the return tol i

lo Isl l power operation. These events were reported per Fort St. Vrain Technical Specifi- I i lo is l l cation AC 7.5.2(b)2 in Preliminary Report No. 50-267/79-02/03-L-0 ll 10171 1 1l 101811 I SE'E *^ 'o*Eco ' sNcSE couPoNENT coot su8cIo'E sNSEE lo19l 8 9 l C l B lh dh l Flh l V l A l L l V l E l X lh [F_jh [QJ h 10 18 20 7 11 12 13 19

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LE R/Ro EVENTYEAR R EPoRT No. CooE TYPE No, h aE, gy l 7l 9l 21 22 l--j 23 l 0 l Ol 21 24 28 d

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36 37 40 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

lilall Leakage past the valve seat insert required bypass of buffer helium dryer for repair.I

,, ,,, g Subsequent investigation revealed slight misalignment between valve stem and seat was l

,,,,, y causing seat leakage problem. Valve was disassembled and stem machined. No further i g l action is anticipated or required. I gl l 7 8 9 80

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1 1 01 0l 01@l 8 9 11 12 N/A l 80 LOSS TvPE oF oR oAuACE To FACIUTY O oEscaiPrioN 1 9 hlN/A 800.4150611 l

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