05000302/LER-1978-006-03, /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

/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: 05000302/LER-1978-006-03, /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
References
LER-78-006-03L, LER-78-6-3L, NUDOCS 8002280873
Download: ML19317G242 (2)

LER-1978-006, /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

Event date:
Report date:
3021978006R03 - NRC Website

text

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, isolation valve MUV-25 was inadvertently opened and " red tagged" out 'of

, service. This caused a plant condition contrary to Tech Spec 3.6.3.1.

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

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

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A clearance order for clearing DOP-23 had been issued. The breaker

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The Clearance Procedure was reviewed with con-l cerned personnel. Plant personnel have been instructed as to the safety aspects of this event.

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.T SUPPLEMENTARY INFORMATION A

1. % p) ort No.:

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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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