ML20038B612

LER 81-003/03L-0:on 810328,3D Diesel Generator Dc Power Failure Alarm Actuated.Caused by Failure of Field Failure Voltage (Ffv) Relay Coil.Ffv Relay Coil Replaced & Generator Returned to Svc

ML20038B612
Person / Time
Site:	Point Beach
Issue date:	04/23/1981
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20038B604	List: ML20038B602 ML20038B612
References
LER-81-003-03L, LER-81-3-3L, NUDOCS 8112080434
Download: ML20038B612 (2)

Text

NEC FORM 366 U. S. NUCLE A"3 R EGUL ATORY COMMISSION ih7H ,

LICENSEE EVENT REPORT

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EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h j o l 2 l l During normal plant operation on March 28, 19 81, at 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br /> , 3D l

[0131 l Diesel generator's DC power failure alarm actuated. Following a satis-l 1o 14 gfactory operability test of 4D Diesel a'c 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br />, 3D Diesel was takenl 0 s I out-of-service to investigate. the problem. This event led to a degraded l 101s l l mode of operation permitted by T.S. 15.3.7.B.l.e and was reportable in l

[ o l 2 l l accordance with T.S. 15.6.9.2.B.2. The health and safety of the publicl 10 is l lwas not af fe cte d . l 7 8 9 80 C DE CO E SUBC E COMPONENT CODE SUSC DE S DE

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44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l 0 l l The 3D Diesel generator's DC power failure alarm was actuated as a l i i l result of the failure of the field failure vol'c age (FFV) relay coil. I i 7 lThe 3D Diesel generator was fully operable until it was taken out-of- l l , ,7l l service to investigate the problem. Following replacement of the FFV l gl relay coil, 3D Diesel generator was returned to service at 1658 hours0.0192 days <br />0.461 hours <br />0.00274 weeks <br />6.30869e-4 months <br /> l 8 9 on 0 3/2 8/81. 80

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ATTACHMENT TO LICENSEE EVENT REPORT NO. 81-003/03L-0 Wisconsin Electric Power Company Point Beach Nuclear Plant Unit 1 Docket No. 50-266 During routine plant operations on March 28, 1981, at 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br />, the DC power failure alarm for the 3D Diesel generator actuated. An investigation into the cause of the alarm was commenced immediately. At 1125 hours0.013 days <br />0.313 hours <br />0.00186 weeks <br />4.280625e-4 months <br />, a test run of the 4D Diesel was initiated and satisfactorily completed at 1245 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.737225e-4 months <br />. Throughout the time from which the DC power failure alarm actuated and the test of the 4D Diesel was comple ted, the 3D Diesel generator was fully operable.

Following the test run of the 4D Diesel, the 3D Diesel was taken out-of-service to investigate the problem more thoroughly. Placing the 3D Diesel out-of-service was reportable in accordance with Technical Specification 15.6.9.2.B.2, as a condition leading to operation in a degraded mode perritted by a limiting condition of operation.

Since the redundant Diesel generator, 4D, was operable while the 3D Diesel was out-of-se rvice , the health and safety of the public were not af fected.

At 1431 hours0.0166 days <br />0.398 hours <br />0.00237 weeks <br />5.444955e-4 months <br /> on March 28, 19 81, the field failure voltage (FFV) relay for the 3D Diesel generator was discovered failed in the conservative position. The relay coil,.which senses generator DC field flashing voltage and actuates an alarm on loss of the same, was found to be defective and was replaced. The 3D Diesel was satis factorily tested and returned to service at 1658 hours0.0192 days <br />0.461 hours <br />0.00274 weeks <br />6.30869e-4 months <br /> on March 28, 1981.

The defective alarm relay coil nameplate data is as follows:

Manufacturer: Square D Company Class: 8501 Type: FSD022-S5 Rating: 24 - 250 V DC; 24 VA 0 - 24 V DC; 10 VA