ML19319D025

LER 78-029/03L-0:on 780428,radiation Area Monitor 2 Found Inoperable.Caused by Ineffective Motor Overload Relays. Relays Renewed & Corrective Action Unnecessary

ML19319D025
Person / Time
Site:	Crystal River
Issue date:	05/18/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19319D024	List: ML19319D023 ML19319D025
References
LER-78-029-03L, LER-78-29-3L, NUDOCS 8003040949
Download: ML19319D025 (2)

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LICENSEE EVENT REPORT

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g, Radiation Area Monitor-2 (RMA-2) was inoper contrary to Technical I m , Specification 3.9.12. Investigation by maintenance personnel revealed i

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siioi]The cause of this event was due to ineffective motor overload relavs. I g , Corrective action unnecessary as motor overload relays were renewed. i

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.-g SUPPLEMENTARY IN70RMATION

1. ort No.: 50-302/78-029/03L-0

2. Fccility: Crystal River Unit #3 .

3. Report Date: 18 May 1978 4 Occurrence Date: 28 April 1978

5. Identification of Occurrence:

Radiation Area Monitor-2 (RMA-2) inoperable contrary to Technical Specification 3.9.12.

6. Conditions Prior to Occurrence:

Mode 6 refueling.

7. D:scription of occurrence:

At 1330 hours0.0154 days <br />0.369 hours <br />0.0022 weeks <br />5.06065e-4 months <br /> frequent high flow alarms were received in the Control Center on Radiation Area Monitor-2 (RMA-2), the Auxiliary Building ventilation exhaust

=onitor. An investigation at this time by maintenance personnel indicated no mechanical malfunction except possible high ambient temperature in the area of the pump motor. A blower was placed in the area of RMA-2 pump motor and returned to service for a crial perioc. . At 1842 on 3 May 1978 frequent high flow alarms were again received in the Control Center. An investigation by maintenance per-3 sonnel at this time indicated that the motor overload relays were ineffective.

8 Motor overload relays of the same type and size were then installed and RMA-2 functionally tested satisfactorily, using the Radiation Monitoring Instrumentation Functional Test Procedure (SP-335) and operability was restored.

8. D:signation of Apparent Cause:

The apparent cause of this event was due to ineffective motor overload relays in the feeder breaker.

9. Analysis of Occurrence:

The health and safety of the general public was not endangered as daily grab samples were taken.

10. Corrective Action:

No corrective action necessary as the motor overload relays were renewed.

11. Failure Data:

Second occurrence of this type event but first time involvement of RMA-2.

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