ML19338F088

LER 80-022/03L-0:on 800911,during Safety Injection Actuation Signal Surveillance test,86B/VIAS Lockout Failed to Trip. Caused by Burned Coil.Coil Replaced W/Spare & Tested Satisfactorily for Proper Operation

ML19338F088
Person / Time
Site:	Fort Calhoun
Issue date:	09/11/1980
From:	Mueller R OMAHA PUBLIC POWER DISTRICT
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19338F082	List: ML19338F081 ML19338F088
References
LER-80-022-03L, LER-80-22-3L, NUDOCS 8010070511
Download: ML19338F088 (4)

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! o 121 l During cerformance of ST-ESF-2. F.2 (B Safety Iniec-ion Actuation Signal % voiltancol ioi3i i Test) the 868/ VIAS lockout failed to trio due to a burnt coil. Durina the time of I l o l 41 l the incident, the 86A/ VIAS, the 86Al/ VIAS and the 86Bl/ VIAS wera enerabia and ivail 1 i o i,i i able to initiate safeguards ecuioment should the need arise~ l I

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A4 47 CAUSE CESCRIPTION AND CCRRECTIVy ACTIONS ii ia i [ The cause of the 86B/ VIAS lockout relay was found to be a faulty coil (burned coil) l t i,i,ii therefore, the coil was replaced with a spare and tested satisfactorily for crocer I i, ,7i ; operation. I I

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LER 80-022 Omaha Public Power District Fort Calhoun Station Unit No.1 Docket No. 0S000285 ATTACHMENT NO. 1

_ Safety Analysis l The Fort Calhoun Station Unit No.1 Engineered Safety Feature System is so designed that no single failure can prevent the per-formance of a safety function, if required.

During the performance of ST-ESF-2, F.2, the 86B/ VIAS lockout

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failed to actuate due to a burnt coil. However, at the time of this occurrence the 86A/ VIAS ("A" Channei) and the 86Al/ VIAS ("B" Channel) relays were operable. In addition, the 86Bl/ VIAS derived signal lockout

("A" Channel) was also operable since the VIAS signal is actuated by a

CRHS, a CSAS or a SIAS signal and is not a function of the 86B/ VIAS lock-l out. Therefore, if required those three signals mentioned above (86A/ VIAS, 86Al/ VIAS and 86Bl/ VIAS) would have actuated all safety equipment necessary to mitigate the consequences of an accident if re-quired.

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LER 80-022 Omaha Public Power District Fort Calhoun Station Unit No. 1 Docxet No. 05000285 ATTACHMENT NO. 2 Corrective Action The failure of the 86B/'/IAS relay was found to be due to a faulty coil. The coil was replaced with a spare per M.0. 7065. Subsequently, the relay was tested for proper operation per ST-ESF-2, F.2 and found to operate as designed.

Continued surveillance will ensure prompt correction of any future problems of this type should they occur.

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LER 80-022 Omaha Public Power District Fort Calhoun Station Unit flo.1

, Docket tio. 05000285 i +

ATTACHMEllT fl0. 3 Failure Data Previous related lockout relays failures were reported per

• LER 79-22, LER 77-26, LER 77-22, LER 78-04, Abnormal Occurrence 75-3 and Abnormal Occurrence 74-18.

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