05000302/LER-1981-037-03, /03L-0:on 810617,during Performance of SP-110, Reactor Protection Sys Functional Testing,Delta Flux Module Meter Indication for Channel C Was Less Conservative than Requirement.Caused by Instrument Drift.Generator Recalibr

/03L-0:on 810617,during Performance of SP-110, Reactor Protection Sys Functional Testing,Delta Flux Module Meter Indication for Channel C Was Less Conservative than Requirement.Caused by Instrument Drift.Generator Recalibr

ML20009E688
Person / Time
Site:	Crystal River
Issue date:	07/14/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009E682	List: 05000302/LER-1981-037, Forwards LER 81-037/03L-0 05000302/LER-1981-037-03, /03L-0:on 810617,during Performance of SP-110, Reactor Protection Sys Functional Testing,Delta Flux Module Meter Indication for Channel C Was Less Conservative than Requirement.Caused by Instrument Drift.Generator Recalibr
References
LER-81-037-03L, LER-81-37-3L, NUDOCS 8107280365
Download: ML20009E688 (2)

LER-1981-037, /03L-0:on 810617,during Performance of SP-110, Reactor Protection Sys Functional Testing,Delta Flux Module Meter Indication for Channel C Was Less Conservative than Requirement.Caused by Instrument Drift.Generator Recalibr

Event date:
Report date:
3021981037R03 - NRC Website

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SUPPLDENTARY INFORMATION Report No.:

50-302/81-037/03L-0 Facility:

Crystal River Unit 3 Rzport Date:

July 14,1981 Occurrence Date:

June 17, 1981 Identification of Occurrence:

The Delta Flux Module Meter Indication for Reactor Protection System Channel "C" was less conservative than the procedural requirement.

This created an event not attributed to a specific shutdown activity as required by Regulatory Guide 1.16 and therefore, contrary to Technical Specification 3.3.1.1.

Conditions Prior to Occurrence:

Mode 3 hot shutdown (0%).

f Dascription of Occurrence:

At 1030 during performance of SP-110, Reactor Protection System Functional Test, it was discovered that the channel "C" Delta Flux Module Meter indication was less conservative than the procedural acceptance criteria.

Maintenance was initiated and' operability was restored at 2002 on June 17, 1981.

Designation of Apparent Cause:

The cause of this event is attributed to instrument drift. The drift would have caused the Reactor trip function of the channel to be less cons'rvative than the limits of Technical Specification 2.2.1.

- Analysis of Occurrence:

Redundancy was provided by channels A, B, and D.

There was no effect upon the health or safety of the general public.

Corrective Action

i The Flux / Delta Flux function generator was recalibrated and the functional test was satisfactory.

The channel "C" function generator will be checked weekly for four weeks to verify operability.

Failure Data:

This was the first occurrence of this type and this is the sixth event reported under this Specification.

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