ML19317G242

LER 78-006/03L-0:on 780111,HPI Isolation Valve MUV-25 Breaker Inadvertantly Opened & Red Tagged Out of Svc During Normal Mode 1 Operations.Clearance Procedure Reviewed W/Personnel

ML19317G242
Person / Time
Site:	Crystal River
Issue date:	02/02/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19317G209	List: ML19317G208 ML19317G242
References
LER-78-006-03L, LER-78-6-3L, NUDOCS 8002280873
Download: ML19317G242 (2)

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, service. This caused a plant condition contrary to Tech Spec 3.6.3.1. No ;

,, ,,, , safety hazard as redundant HPI subsystem was available and operable. Upon ;

,, , , discovery, the breaker was 1:mnediately closed restoring operability of MUV-p -

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. .T SUPPLEMENTARY INFORMATION A

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1. % p) ort No.: 50 .~_'78-006/03L-0

2. facility: Crystal River Unit #3 -

3. Report Date: 2 February 1978

4. Occurrence Date: 11 January 1978

, 5. Identification of Occurrence:

High pressure injection isolation valve MUV-25 inoperable contrary to Technical Specification 3.6.3.1.

6. Conditions Prior to Occurrence:

Mode 1 operation.

7. Description of Occurrence: ,

At 2145, it was discovered that Control Center position indication for the EP '

injection isolation valve MUV-25 was inoperable. An 1:nmediate. investigation revealed that the breaker for valve MUV-25 was open and the breaker was " red tagged".

Further investigation revealed that a clearance had been issued for the domestic water pump, DOP-23. The breaker cubicle for DOP-23 was adjacent to the breaker cubicle for MOV-25. It was confirmed that the breaker for MOV-25 was mistakenly opened and " red tagged" in lieu of the breaker for DOP-23. Upon confirmation of the clearance error the breaker for MUV-25 was closed, restoring its operability.

8. Designation of Apparent Cause:

The cause of this event was personnel error, in that the wrong breaker was opened and " red tagged".

, 9. Analysis of Occurrence:

There were no safety implications as either HPI subsystem 'in conjunction with the core flooding system would maintain temperatures within prescribed limits in the event of accident conditions. _

10. Corrective Action:

All shift supervisors have been instructed to inform and discuss the safety aspects of proper clearance and tagging with personnel on their shifts. A plant safety meeting was held and the Clearance Procedure was reviewed for all attendees.

11. Failure Data:

This is the first occurrence of an event due to improper clearance of equipment out of service.

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