05000302/LER-1978-029-03, /03L-0:on 780428,radiation Area Monitor 2 Found Inoperable.Caused by Ineffective Motor Overload Relays. Relays Renewed & Corrective Action Unnecessary

/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: 05000302/LER-1978-029, Forwards LER 78-029/03L-0 05000302/LER-1978-029-03, /03L-0:on 780428,radiation Area Monitor 2 Found Inoperable.Caused by Ineffective Motor Overload Relays. Relays Renewed & Corrective Action Unnecessary
References
LER-78-029-03L, LER-78-29-3L, NUDOCS 8003040949
Download: ML19319D025 (2)

LER-1978-029, /03L-0:on 780428,radiation Area Monitor 2 Found Inoperable.Caused by Ineffective Motor Overload Relays. Relays Renewed & Corrective Action Unnecessary

Event date:
Report date:
3021978029R03 - NRC Website

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g, Radiation Area Monitor-2 (RMA-2) was inoper contrary to Technical I

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that the motor overload relays on the monitor pump motor were ineffective. ;

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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.

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,Second occurrence of this type of event.

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(SEE ATTACIIED SUI'I'LEMENT.'.hY INF0D'.'C'CN SHEET) 40fff a

.-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-sonnel at this time indicated that the motor overload relays were ineffective.

3 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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