ML19318A987

LER 80-020/03L-0:on 800426,during Refueling Outage 4,14 Primary Containment Isolation Valves Found to Have Seat Leakage Over Requirements.Caused by Normal Deterioration of Disc to Seat Mating Surface

ML19318A987
Person / Time
Site:	Pilgrim
Issue date:	06/18/1980
From:	Mcguire T BOSTON EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19318A983	List: ML19318A982 ML19318A987
References
LER-80-020-03L-01, LER-80-20-3L-1, NUDOCS 8006240479
Download: ML19318A987 (2)

Text

INRC FCRM 366' U. S. NUCLEAR REGULATORY COMMISSION

" (7 77) p . LICENSEE EVENT REPORT t i (PLEASE PRINT OR TYPE ALL REQUIR8ED INFORMATION)

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7 60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT OESCRIPTION ANp PROBABLE CONSEQUENCES h 10121 l During Refueling Outage IV, Fourteen (14) Pr.imary Containment Isolation Valves [

ITTTlI (see Attachment) were found to have seat leakage in excess of that permitted by  ;

Technical Specifications, Section 4.7.A.2.F. All valves have been repaired and l I O 14 l l I o I 51, I tested satisfactorily. [

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS IiIc11 The cause of these excessive leakage rates was normal deterioration of the disc l gl to seat mating surfaces. The surfaces were lapped, valves reassembled and tested  ;

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STA S  % POWER OTHER STATUS IS RY OISCOVERY DESCRIPTION y l H l@ l0 l Ol 0l@l N.A. l l Bl@l LLRT l ACTIVITY CO TENT LOCATION O.T RELEASE AELEASED OF RELEASE ANtOUN OF ACTIVITY 1 I

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.- BOSTON EDISON COMPAlli FILCRIM NUCLEAR POWER STATION

• DOCKCT UO. 50-293 Attachnient to LER 80-020/03L-0

• Valve' Valve Valve Final test Leak Number Description Type Rate at 45 PSIG Date Passed A0 203-1A MSIV "A" inboard 20" globe 7.886 SLM 4/18/80 A0 203-1B MSIV "B" inboard 20" globe 7.30 SLM 4/5/80 A0 203-1D MSIV "D" Inboard 20" globe 6.141 SLM 4/7/80 58A F.W. Check "A" inboard 18" check 1.0 SLM 4/26/80 62A F.W. Check "A" outboard 18" check 3.867 SLM 4/26/80 t

58B F.W. Check "B" inboard 18" check 0.1 SLM* 4/26/80 62B F.W. Check "B" outboard 18" check 0.733 SLM 4/26/80 A0 4356 Service Air to Drywell 3" gate 3.5 SLM 3/11/80 Drywell Service Air 3" check 5 .0 SLM 3/11/80 MO-1001-28A "A" RHR Vessel inj. 18" globe 3.1 SLM 4/24/80 MD-1001-29B "B" RHR Vessel inj. 18" gate 0.1 SLM* 2/7/80 A0-5036 A&B' Torus purge inlet 20" butfly. 1.2 SLM 4/1/80 A0-5040 A Vacuum Breaker 20" butfly. 0.1 SLM* 3/17/80 A0-5042 A&B Torus Vent Gutlet 20" butfly. 7.0 SLM 3/17/80

• This value is the leak rate monitor minimum sensitivity based on a 0.5% of full' scale error for low range readings from the calibration records.

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