ML19209B582

LER 79-017/03L-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

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: ML19209B573 ML19209B582
References
LER-79-017-03L-03, LER-79-17-3L-3, NUDOCS 7910100186
Download: ML19209B582 (1)

Text

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

LICENSEE EVENT REPORT CONTROL BLOCK: (( 1 l l l l 6

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C' DOCK ET NUMSER EVENT CATE 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 o 4 A0 2-1601-32A failed to annunciate upon opening the valve. The Division 11 alarm and l glg local velve position indicating lights did confirm proper valve operability. In l o s i addition a decreasa in drywell pressure was observed indicating the valve opened. A l 0 7 suppression cNmber-to-drywell pressure seperation test was performed as required by l 0 s i T.S. 3.7.A.4.d. 80 l

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CAUSE DESCRIPTION AND C RDECTivE ACTICNS h 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 3, 2 L 1979, at whic" time all valve position indications and both division I and 11 control i

, 3 room alarms cerformed procerly. The vacuum treaker limit switches will be insoected l 4 l and adjusted cs necessary during the Fall. 1979 refueling outage. I 7 3 9 90 ST S  % p "A E R # OT>'ER STATUS SCO AY DISCOVERY DE$ RIPTION Q l E l@ l 0 l 6 l 7 lhl NA l l8 l@l Routing Test l AC TIVITY CO TENT AELEASED OF AELE ASE AVOUNT CF ACTIVITY LOC AT'ON OF RELE ASE

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