ML19270F668

LER 79-003/03L-0 on 790122:containment Purge Vol Bounded by Valves Had Leak Rate of 58.3 Std Cubic Feet Per Hour.Caused by Insufficient Stem Travel to Allow Valve Disc to Fully Contact Valve Seat.Valve Operator Stroke Lengthened

ML19270F668
Person / Time
Site:	Quad Cities
Issue date:	02/16/1979
From:	Kooi M COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17296A304	List: ML17296A303 ML19270F656 ML19270F659 ML19270F662 ML19270F668 ML19270F673 ML19270F676 ML19270F679 ML19270F682 ML19270F683 ML19270F684
References
LER-79-003-03L-03, LER-79-3-3L-3, NUDOCS 7903070346
Download: ML19270F668 (1)

Text

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LICENSEE EVENT REPORT

' CONTROL BLOCK: l l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 l0 l1l 7 8 9 l l l LLICENSEE lQ l CODE A lD l1 l@l0 l0 l0 l- LICENSE 14 15 l0 l- l0l0l0l@l4 l0 l0 NUMBEH 25 26 1LICENSE l1 l 1TYPE l 1JOl@lb 7 CAl T bdl@

CON'T IOlil 7 8 5$ $ l60L l@l61 01 5101010121 DOCK ET NUMB E R S l 68A l@l 69 01112121719 EVENT DATE 74

@lo l REPOR 75

? It Tl DATE A 17 18096 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10121 l While performino local leak rate testina. the containmont nuran unlumn bnnnana hv l0l3l l valves A0 1-1601-21, 22, 55, 56 was found to have a leak rate of Q.3 SCFH. Further i g y I testing of the volume showed that the majority of the leakace was throuah valve 1

[O ls! l A0 1-1601-55. The safety implications of this event are minimal since valves A0 l

[O lc l l 1-1601-21, 22, 56 were within acceptable leakage limits. The volume would have l l0 l7l l Isolated properly when needed. l 101811 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUSCODE l0l9]

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di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h

[i l o l l The full closing stroke of the valve operator did not Dermit enouah stem travel to I 1 i l allow the valve disc to fully contact the valve seat. This conditon resultna in

, 7 leakage past the valve seat. The valve operator stroke was lenothened and the valve gil3ll retested. The corrected leak rate for the volume was found to be 14.5 SCFN.

I i 4 I 80 7 8 9 STA S 9. POWER OTHER STATUS is O RY DISCOVERY DESCRIPTION Local Leak Rate Testing l I115 l b@ l 0 l 0 l 0 [@l NA l lB l@l ACTIVITY CO TENT RELE ASED OF HE LE ASE AMOUNT OF ACTIVITY LOCATION OF RELEASE i e [Z j @ l Z lgl NA 44 l l 45 NA 80 l

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. Kooi PHONE: 30 H W M 1, M . E{