ML20052C939

LER 82-028/03L-0:on 820330,following Reactor Trip,Discovered Source Range Instrument Indicating Below Tech Spec Limits.Caused by Failed High Voltage Power Supply.Power Supply for Instrument Replaced

ML20052C939
Person / Time
Site:	Crystal River
Issue date:	04/30/1982
From:	Charles Brown FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20052C931	List: ML20052C930 ML20052C939
References
LER-82-028-03L, LER-82-28-3L, NUDOCS 8205060121
Download: ML20052C939 (2)

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[o l 2 ] l At 1856, following a reactor trip, it was discovered that Source Range Instrument (NI -2) l g 3 g was indicating approximately 3.5 decades low. This created an event contrary to T.S. 3.3.1.lg Source Range Instrument (NI-1) and intermediate channels indication agreed. Redundancy was g provided by source range instrument (NI-1). Maintenance was initiated and operability was y gg g y g restored at 2335 on 3/30/82. There was no effect upon the health or safety of the general l ggg,gg public. This was the first occurrence of this type, and this is the second report under [

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44 47 CAUSE CESCRIPTIO!: AND CCRRECTIVE ACTIONS h N o] l The cause of this event is attributed to a failed high voltage power supply. The hiah I l t j i ] } voltage power supply for source ranne instrument (NI-2) was reDlaced' and functionally I

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, SUPPLEMENTARY INFORMATION l Report No.: 50-302/82-028/03L-0 Facility: Crystal River Unit 3 Report Date: April 30,1982 Occurrence Date: March 30, 1982 Identification of Occurrence:

Failure to have two (2) operable source range instruments.

contrary to Technical Specification 3.3.1.1.

Conditions Prior to Occurrence:

Mode 3 hot standby (0%).

Description of Occurrence:

At 1856, following a reactor trip, it was discovered that source range instrument (NI-2) was indicating three and one decades lower than the other instrumentation. Maintenance was initiated and operability was restored at 2335 on March 30, 1982.

Designation of Apparent Cause:

The cause of this event is attributed to a failed high voltage power supply for source range instrument (NI-2)

Analysis of Occurrence:

Redundancy was provided by source range instrument (NI-1) and the reactor was in a shutdown condition. There was no effect upon the health or safety of the general public.

Corrective Action:

The high voltage power supply was replaced and the instrument was functionally tested satisfactorily. No further corrective action is deemed necessary.

Failure Data:

This was the first occurrence of this type and this is the second report under this Specification.

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