05000302/LER-1979-008-03, /03L-0 on 790119:RC3-GP3-BL4 Light Did Not Extinguish When Test Switch Returned to Off Position.Caused by Dirty Contacts in Relay

/03L-0 on 790119:RC3-GP3-BL4 Light Did Not Extinguish When Test Switch Returned to Off Position.Caused by Dirty Contacts in Relay

ML19269C951
Person / Time
Site:	Crystal River
Issue date:	02/13/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19269C949	List: 05000302/LER-1979-008, Forwards LER 79-008/03L-0 05000302/LER-1979-008-03, /03L-0 on 790119:RC3-GP3-BL4 Light Did Not Extinguish When Test Switch Returned to Off Position.Caused by Dirty Contacts in Relay
References
LER-79-008-03L, LER-79-8-3L, NUDOCS 7902220120
Download: ML19269C951 (2)

LER-1979-008, /03L-0 on 790119:RC3-GP3-BL4 Light Did Not Extinguish When Test Switch Returned to Off Position.Caused by Dirty Contacts in Relay

Event date:
Report date:
3021979008R03 - NRC Website

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8 1346 while performing Engineered Safeguards Monthly Functional Test, j

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,(SP-130), it was discovered that RC3-GP3-BL4 light did not extinguish when g Investigation revealed,

,the test switch was returned to the off position.

5C had failed. This created an event contrary to ;

,thw. relay AR in cabinet

Technical Specification 3.3.2.1.

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Operability i o,6 No affect on public health and safety as redun,

was restored in two hours.

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J. N e 790222o u.0 (SE ATTACHED SUPPLEMENTA'lY INFORMATION SHEET)

SUPPLEMENTARY INFORMATION Report No.:

50-302/79-008/03L-0 Facility:

Crystal River Unit #3 Report Date:

13 February 1979 Occurrence Date:

19 January 1979 Identification of Occurrence:

One inoperable engineered safety feature actuation system instrument channel contrary to Technical Specification 3.3.2.1.

Conditions Prior to Occurrence:

Mode 1 power operation (68%)

Description of Occurrence:

At 1346 while performing the Engineered Safeguardc Monthly Functional Test (SP-130), it was discovered that RC3-GP3-BL4 light would not extinguish when the test switch was returned to the off position. Upon investigation it was determined that relay AR had failed. Operability was restored in two hours.

Designation of Apparent Cause:

The cause of this event was found to be dirty contacts in the AR relay.

Analysis of Occurrence:

There was no hazard to the plant or general public as the affected channel was in a test mode with the two remaining channels operable.

Corrective Action

The relay was sprayed with a contact cleaner, tested, and returned to operable status.

Engineering study (PD-718) associated with air filtration of engineered safeguards cabinets is being conducted to prevent recurrence.

Failure Data:

Eleven previous occurrences reported.

Fourth occurrence of this type.

/rc