05000254/LER-1979-003-03, /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

/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: 05000254/LER-1979-003-03, /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 ML19276F351
References
LER-79-003-03L-01, LER-79-3-3L-1, NUDOCS 7903290092
Download: ML19276F389 (1)

LER-1979-003, /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

Event date:
Report date:
2541979003R03 - NRC Website

text

U. S. NUCLE AR REGUL ATORY CO*dMI53 ION

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(PLEAsE PRINT C A TYPE ALL REQUIRED INFORMATION) l I

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

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.

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

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

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,o l The 1-203-10 valve stroke was adjusted reducing the leak rate to 10.0 SCFH.

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valves on the A, B, and C steam lines were dismantled and reoai red.

Wo rk included I

l lapping and machining of the main and pilot discs and seats.

A subsecuent test

,, g showed corrected leak rates to be:

1-203-IA, 1.2 SCFH: 1-203-2A, 1.2 SCFH; 1-203-1B,l 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 Schi 3 3 VETuCD CF S n Tus

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