05000302/LER-1981-002-03, /03L-0:on 810109,containment Isolation Valve CAV-1 Failed to Close After Sampling Pressurizer Steam Space. Caused by Failed Contacts in Torque Switch of Valve Operator.Switch Replaced & Operability Restored

/03L-0:on 810109,containment Isolation Valve CAV-1 Failed to Close After Sampling Pressurizer Steam Space. Caused by Failed Contacts in Torque Switch of Valve Operator.Switch Replaced & Operability Restored

ML20003A977
Person / Time
Site:	Crystal River
Issue date:	02/06/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003A971	List: 05000302/LER-1981-002, Forwards LER 81-002/03L-0 05000302/LER-1981-002-03, /03L-0:on 810109,containment Isolation Valve CAV-1 Failed to Close After Sampling Pressurizer Steam Space. Caused by Failed Contacts in Torque Switch of Valve Operator.Switch Replaced & Operability Restored
References
LER-81-002-03L, LER-81-2-3L, NUDOCS 8102100143
Download: ML20003A977 (2)

LER-1981-002, /03L-0:on 810109,containment Isolation Valve CAV-1 Failed to Close After Sampling Pressurizer Steam Space. Caused by Failed Contacts in Torque Switch of Valve Operator.Switch Replaced & Operability Restored

Event date:
Report date:
3021981002R03 - NRC Website

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s SUPPLEMENTARY INFORMATION i

Report No.:

50-302/81-002/03 L-0 Facility:

Crystal River Unit 3 Report Dates 6 February 1981 Occurrence Date:

January 9, 1981 Identification of Occurrence:

Failure to have a containment isolation valve operable contrary to Technical Specification 3.6.3.1.

Conditions Prior to Occurrence:

Mode 1 power operation (97%).

Description of Occurrence:

At 2245 af ter sampling the pressurizer steam space, it was discovered that containment isolation valve CAV-1 would not close. Manual valves CAV-133, 323, 330 and 336 were closed and maintenance was initiated. Opera-bility was restored at 0600 on January 10, 1981.

Designation of Apparent Cause:

The cause of this event is attributed to failed contacts in the torque switch of the valve operator.

Analysis of occurrence:

There were no effects upon the health or safety of the general public.

Corrective Action

The torque switch was replaced and the valve was satis-factorily tested. No further corrective action is deemed necessary at this time. A review of failure of Contain-s{ e E e

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Failure Data:

This is the third occurrence for CAV-1 and the thirty-first. event reported under this specification.

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