ML19350E255

LER 81-032/01T-0:on 810601,during Normal Operation W/Dts 300-2 in Progress,Control Rod Driveline E-8 Exceeded Tech Spec 3.3.C.2 Limit.Caused by Sticking Scram Solenoid Valve. Valve Rebuilt & Tested.Driveline Returned to Svc & Tested

ML19350E255
Person / Time
Site:	Dresden
Issue date:	06/04/1981
From:	Holland P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19350E253	List: ML19350E252 ML19350E255
References
LER-81-032-01T, LER-81-32-1T, NUDOCS 8106170208
Download: ML19350E255 (2)

Text

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7 8 81 ooCKtfNuuSER e et EVENT oATE 74 EVENT OESCRIPT10N ANO PROSA8LE CONSEQUENCES to l777l l During normal o'perations, with DTS 30 2 in progress, CRD E-8 exceeded Tech. Spec. l r.umi l 3.3.c.2 limit of 7 seconds. The rod was inserted to 00 and taken out of service. l g The safety significance was minimal since the rod responded to normal and scram signals.l lo isi I There was no effect on public health or. safety. This is the first occurrence of this l

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CAUSE DESCRIPTION AND CORRECTIVE ACTICNS h

i ,o l l The cause of this event was a sticking S02-0305-118 scram solenoid valve. The valve I g g g was rebuilt and satisfactorily tested. The CRD was returned to service and tested. slll

times were well within Tech. Spec. limits. ,

scram testing per DTS 300-2 will continue col lbe performed every 16 weeks during operation. ,

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ATTACHMENT TO 1,ICENSEE EVENT REPORT 81-032/01T-0 ~ '

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DRESDEN UNIT _2]ILDRS 2)

DOCKET 450-237

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. . . - a During normal operations, with DTS 300-2 Control Rod Drive' Scram Testing j - in progress, CRD E-8 exceeded Tech. Spec. 3.3.C.2 limit of 7 seconds. The rod was in'erted s to position "00" and electrically disarmed. The safety sig-nificance was minimal since the rod responded to normal and scram signals.

There was no effect on public health or safety. This is the first occurrence e of this type at Dresden.

The cause of the event was a sticking scram pilot solenoid valve, S02-0305-118.

This prevented full opening of the scram valves and increased the time requirad for full insertion. The valv2 was rebuilt with no specific deficiences noted and subse-

, quantly tested satisfactorily. CRD F-8 was placed back in service and scram tested, all times were well within Tech. Sec limits. Scram Testing per DTS 300-2 will continue to be performed every 16 weeks during operation.

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