ML19276F389

LER 79-003/03L-1 on 790119:MSIV Local Leak Rate Showed Seven Valves Leaking Excessively.Causes Unspecified.Valve Stroke Adjusted,Certain Valves Dismantled,Discs & Seats Were Lapped & Machined

ML19276F389
Person / Time
Site:	Quad Cities
Issue date:	03/09/1979
From:	Kopacz J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19276F352	List: ML19276F351 ML19276F356 ML19276F387 ML19276F389
References
LER-79-003-03L-01, LER-79-3-3L-1, NUDOCS 7903290092
Download: ML19276F389 (1)

Text

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While performing the Main Steam Isolation Valve Local Leak Rate Tee voca+ ra l

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QTS 100-3,va lves A0 1-203-1 A, A0 1-203-2A, A0 1-203-18, A0 1-203-28. A0 1-203-1 C . I

2 l A0 1-203-2C and A0 1-203-1D were found to have leakage rates in excess of the i 1 , ,

11.5 SCFH allowable 1imi t as specified by Technical Speci fication 4.7.A.2.i.c. ]

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ir , 1 63 3 3 COVP VALVT SYST E *.i CAUSE CAUSE SUSCODE SU8COCE CCVPCNENT CODE SUSCOCE CCCE COOE

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EVENT N EAR R EPOR T '40.

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.I 22 23 24 26 A TT AC W.* E N T NPRC.4 PRIV E CC*.*P. CCVPONENT ACTICN FUTU4E EFFECT SHUT DOAN FORM bub. SU PPU ER VANUFACTUPER ON PLANT VETH00 HOURS SUEMITTED TAKEN ACTION lB lgl34Z l@ l Zlg l 0] 0l 0l l lN@ lYl@ lNl@ C161615l@

3J 35 l36Zl@ 31 40 41 42 43 44 47 CA'!SE DESCPIPTioN AND CORRECTIVE ACT!CNS h l The 1-203-10 valve stroke was adjusted reducing the leak rate to 10.0 SCFH. The l

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valves on the A, B, and C steam lines were dismantled and reoai red. Wo rk included I

,, g lapping and machining of the main and pilot discs and seats. A subsecuent test  !

1-203-IA, 1.2 SCFH: 1-203-2A, 1.2 SCFH; 1-203-1B,l

,_; ; showed corrected leak rates to be:

2.2 SCFh; 1-203-2B, 3.6 SCFH; 1-203-1C, 0.0 SCFH; 1-203-2C, 0.0 SCFH; and 1-203-1D,10 0

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% PCAER CTHE R S TATU5 OtSCOVERY S n Tus iL lH lg l q 0j NA l l B lhl46 Local Leak Rate Testinc l 80

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