05000317/LER-1980-033-03, /03L-0:on 800702,during Routine Test,Containment Air Cooler 14 Could Not Be Stopped or Shifted to Low Speed from Control Room.Caused by Relay 424 in Fan Controller Failing to Drop Out When de-energized

/03L-0:on 800702,during Routine Test,Containment Air Cooler 14 Could Not Be Stopped or Shifted to Low Speed from Control Room.Caused by Relay 424 in Fan Controller Failing to Drop Out When de-energized

ML19330B980
Person / Time
Site:	Calvert Cliffs
Issue date:	07/29/1980
From:	Davis S, Rizzo P BALTIMORE GAS & ELECTRIC CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19330B978	List: 05000317/LER-1980-033, Forwards LER 80-033/03L-0 05000317/LER-1980-033-03, /03L-0:on 800702,during Routine Test,Containment Air Cooler 14 Could Not Be Stopped or Shifted to Low Speed from Control Room.Caused by Relay 424 in Fan Controller Failing to Drop Out When de-energized
References
LER-80-033-03L, LER-80-33-3L, NUDOCS 8008070343
Download: ML19330B980 (1)

LER-1980-033, /03L-0:on 800702,during Routine Test,Containment Air Cooler 14 Could Not Be Stopped or Shifted to Low Speed from Control Room.Caused by Relay 424 in Fan Controller Failing to Drop Out When de-energized

Event date:
Report date:
3171980033R03 - NRC Website

text

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LICENSEE EVENT REPORT CONTROL SLOCK: l l

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60 61 QOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT QATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES iOi2i l At 0415 durino the perfonnance of a utine test it was discovered that

1. 14 containment air cooler could not be stopped or shifted to low speed

,Oi3, i i O y i ; (LOCA speed) from the Control Room. The cooler was declared inoperable iOisl l and placed out of service per T.S. 3.6.2.2.

The three redundant coolers i

iO is i l and the containment spray system remained operable durino the event. The i

10,7l l cooler was returned to service at 1050. LER 75-26 (U-1) describes a similar

)otal l occurrence.

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43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h it i o i ; Investigation revealed Relay 42H in the fan controller failed to droo out when i

ii ii i I deenergized. The relay was cleaned and was tested several times with satisfactory I

i, i2, I results. The eouipment is tested in the existino preventive maintenance orocram.

I i,,3i l No further action is olanned at this time, because failure rate is not I

ii i4 i l sienificant.

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