05000265/LER-1979-017-03, /03L-0:on 790822,during Monthly Surveillance, Division 1 Alarm on Vacuum Breaker Failed to Annunciate Upon Valve Opening.Caused by Limit Switch Problem.Vacuum Breaker Limit Switches Will Be Inspected During Outage

/03L-0:on 790822,during Monthly Surveillance, Division 1 Alarm on Vacuum Breaker Failed to Annunciate Upon Valve Opening.Caused by Limit Switch Problem.Vacuum Breaker Limit Switches Will Be Inspected During Outage

ML19209B582
Person / Time
Site:	Quad Cities
Issue date:	09/21/1979
From:	Robert Murray COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19209B574	List: 05000265/LER-1979-017, Forwards LER 79-017/03L-0 05000265/LER-1979-017-03, /03L-0:on 790822,during Monthly Surveillance, Division 1 Alarm on Vacuum Breaker Failed to Annunciate Upon Valve Opening.Caused by Limit Switch Problem.Vacuum Breaker Limit Switches Will Be Inspected During Outage
References
LER-79-017-03L-03, LER-79-17-3L-3, NUDOCS 7910100186
Download: ML19209B582 (1)

LER-1979-017, /03L-0:on 790822,during Monthly Surveillance, Division 1 Alarm on Vacuum Breaker Failed to Annunciate Upon Valve Opening.Caused by Limit Switch Problem.Vacuum Breaker Limit Switches Will Be Inspected During Outage

Event date:
Report date:
2651979017R03 - NRC Website

text

NRC F 3PA 366 U. S. NUCLEAR REGULATORY CoMMISSloN (7-77)

LICENSEE EVENT REPORT CONTROL BLOCK: ((

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l l lh (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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DOCK ET NUMSER 6d 63 EVENT CATE 74 75 AEPORT CATE 83 EVENT DESCRIPTION N40 PROBABLE CONSEQUENCES h c

2 l While performina the Pressure Suppression Chamber-to-Drywell Vacuum Breaker Monthly I

o 3 l Surveillance, procedure QOS 1600-1, the Division i alarm on vacuum breaker l

A0 2-1601-32A failed to annunciate upon opening the valve.

The Division 11 alarm and l o

4 glg local velve position indicating lights did confirm proper valve operability.

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i addition a decreasa in drywell pressure was observed indicating the valve opened. A l

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suppression cNmber-to-drywell pressure seperation test was performed as required by l

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42 43 44 47 RDECTivE ACTICNS h CAUSE DESCRIPTION AND C 1

o The vacuum breaker alarm m)lfunctioned due to a limit switch oroblem.

The [t lij i A0 2-1601-32A acuum breaker was retested on Sectember 6 and acain on September 18.

1 L 979, at whic" time all valve position indications and both division I and 11 control i

1 3,

2 room alarms cerformed procerly.

The vacuum treaker limit switches will be insoected l

3 l and adjusted cs necessary during the Fall. 1979 refueling outage.

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