ML19317G293

LER 78-009/03L-0:on 780122 Control Rod Driveline Breaker a Failed to Trip During Reactor Protection Sys Functional Test SP-110.Caused by Undercurrent Relay Failure.Breaker Replaced

ML19317G293
Person / Time
Site:	Crystal River
Issue date:	02/13/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19317G289	List: ML19317G288 ML19317G293
References
LER-78-009-03L, LER-78-9-3L, NUDOCS 8002280910
Download: ML19317G293 (2)

Text

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SUPPLEMENTARY INFORMATION V~Nport No.: 50-302/78-009/03L-0

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2.' fac111ty: Crystal River Uni.e #3

3. Report Date: 13 February 1978

4. Occurrence Date: 22 January 1978

5. Identification of Occurrence:

The "A" control rod drive breaker failed to trip contrary to Table 3.3-1 of Technical Specificatisa 3.3.1.1.

6. Conditions Prior to Occurrence:

Made 3 hot standby operation.

7. Description of Occurrence:

Ac 0400, during the perfor: nance of the RPS Functional Test SP-110, in preparation for ,-

unic startup, the "A" control rod drive breaker failed to trip when a simulated trip .,

signal was- initiated. The electrical supervisor was notified. and naistanance Work RequesC- )

1. 0-6041 was initiated. The "A" CRD breaker was renewed with a. replacement breaker and was tested satisfactorily in accordanca with Preventive Maintenance Procedure PM-ll8. l

8. Designation of Apparent Cause:

The cause of this evenn was due to the failure of the breaker undercurrent relay to function.

9. Analysis of Occurrence:

There were no safety 1:mplications as a result of this occurrence as redundant control rod drive breakers were available and verified operable.

10. Corrective Action:

Preventive Maintenance Procedure PM-118 was perfor:med en all CRD breakers with satisfacto: l results .

11. Failure Data: l This is the first occurrence of this event.

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