ML19319C897

LER 78-021/03L-0:on 780405,fire Svc Valve 240 Declared Inoperable.Caused by Moisture Buildup in Control Circuit Box Shorting Circuit Board.Control Circuit Board Replaced & Valve Operability Restored

ML19319C897
Person / Time
Site:	Crystal River
Issue date:	04/27/1978
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19319C892	List: ML19319C891 ML19319C897
References
LER-78-021-03L, LER-78-21-3L, NUDOCS 8003040851
Download: ML19319C897 (2)

Text

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,0,: ,; At 0930 Fire Service valve 240 FSV-240) was declared inoperable. Troubiq l

, , , shooting the alarm circuitry revealed burned out control circuit board. ,

3 ..; i No safety hazard as an operator was assigned to manually actuate FSV-240 t i . ,! ; in case of fire. Circuit board was reolaced and valve operability r i2..i t restored. First occurrence of this event. I i 1

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N SUPPLEMENTARY INFOIL% TION N

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1. __lport No.: 50-302/78-021/03L-0

2. Facility: Crystal River Unic #3

3. Report Date: 26 April 1978 4 Occurrence Date: 5 April 1978

5. Identification of Occurrence:

Failure of FSV-240 control circuit to give proper alarms upon actuation.

6. Conditions Prior to occurrence:

Mode 6 refueling.

7. Description of Occurrence:

At 0930 it was determined that Fire Service Valve 240 (FSV-240) was inoperable.

Investigation into the problem by electricians revealed that the control circuit board was burned out. An operator was assigned to manually actuate the valve in case of fire in the Control Complex. Control circuit board was replaced and FSV-240 returned to service on 15 April 1978.

8 O 2signation of Apparent Cause:

V Meisture 'in control circuit box caused shorting of circuit board.

i 9. Analysis of occurrence:

There was no danger to the plant or public as an operator was assigned to manually actuate FSV-240 in case of a fire.

10. Corrective Action:

Work Request #291 was initiated to seal FSV-240 control box and desiccant bags have been ordered to be placed in box to prevent noisture buildup on control circuit board.

11. Failure Data:

First occurrence of this type.

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