05000237/LER-1979-055-03, /03L-0:on 791004,following Pipe Hanger Repairs, Valve 2-1601-60 Failed to Close by Moving Control Switch, But Did Close When Versa Air Switching Valve Was Tapped. Caused by Malfunction of Versa Air Switching Valve

/03L-0:on 791004,following Pipe Hanger Repairs, Valve 2-1601-60 Failed to Close by Moving Control Switch, But Did Close When Versa Air Switching Valve Was Tapped. Caused by Malfunction of Versa Air Switching Valve

ML17174A100
Person / Time
Site:	Dresden
Issue date:	10/30/1979
From:	Badran S COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A101	List: 05000237/LER-1979-055, Forwards LER 79-055/03L-0 05000237/LER-1979-055-03, /03L-0:on 791004,following Pipe Hanger Repairs, Valve 2-1601-60 Failed to Close by Moving Control Switch, But Did Close When Versa Air Switching Valve Was Tapped. Caused by Malfunction of Versa Air Switching Valve
References
LER-79-055-03L-01, LER-79-55-3L-1, NUDOCS 7911060269
Download: ML17174A100 (2)

LER-1979-055, /03L-0:on 791004,following Pipe Hanger Repairs, Valve 2-1601-60 Failed to Close by Moving Control Switch, But Did Close When Versa Air Switching Valve Was Tapped. Caused by Malfunction of Versa Air Switching Valve

Event date:
Report date:
2371979055R03 - NRC Website

text

Common-Ith Edison Dresden Nuclear Power Station R.R. #1 Morris, Illinois 60450 Telephone 815/942-2920 BBS.Ltr fl 79-866 October 29, 1979 James G. Keppler, Regional Director Directorate of Regulatory Operations - Region III U.S. Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137 DS5 Reportable Occurrence Report fl79-55/03L-0~ Docket 11050-237 is hereby submitted to your office in accordance.with Dresden Nuclear Power Station Technical Specification 6.* 6.B."2. (b), conditions leading to operation in a degraded mode permitted by a limiting condition for operation,or plant shutdown required by a limiting condition for operation.

.BBS: leg Enclosure ens on Station Super.intendent

. Dresden Nuclear Power Station cc:

Director of Inspection & Enforcement Direc*tor of Management Information & Program Control File/NRC 79 I/ 060 -;;..6~

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• ........... r1._,.....,.....,.-..

• LICENSEE EVENT REPORT

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'. IPLEASE PRINT QR TV.LL REQUIRED INFORMATION I

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LICENSEE CODE 14

. 15 LICENSE NUMBER

25.

26 LICENSE TYPE

JO 57 CAT 58

.-CON'T

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60 61 DOCKET NUMBER 68 69

. EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES@

'.IIJIJ I During normal operation, valves 2-1601-62,. 23, 60, and 61 were cycled prior to return

'.IiJiJ to service after pipe hanger repairs on. drywell/t~r~s vent l.ine (REF. 79-0S4/03L-0).

1.

Ji11J The 2-1601-60 valve f*ailed to close when control switch was moved to closed position *

'..filTI but did close when Versa air switching valve was tapped.

• Since primary containment*

'.Io j s I I integrity was maintained with the 2-1601-ffJ. & 24 valves closed, the safety signif i:-

• I *

'.III2J I cance of this event was minimal.

Previous failures of solenoid valve have occurred SYSTEM

CAUSE

CAUSE COMP.

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SUPPLIER COMPONENT MANUFACTURER

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS @

43 44 47

]J))J I Valve failed to close due to the-malfunction of the Versa air switching valve.

In-

'ITIIJ ternal inspection of switching valve revealed accumulation of corrosion and dirt JITIJ particles on iri.tem.als.

Entire Versa air*switching valve replaced & proper*valve IIITJ

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rr:r:rJ I *utilized to ensure operability.

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DESCRIPTION

.[!]2] I 0 I 0 I 010~@.____N_/A __. ________________

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9 1f 12 13 PERSONNEL INJURIES

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TYPE

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