05000302/LER-1979-050-03, /03L-0 on 790510:count-rate Amplifier & Rate of Change Amplifier for Nuclear Source Range Instrument NI-2 Found Inoperable.Caused by Amplifiers Being Out of Tolerance Due to Instrument Drift.Amplifiers Recalbr & Returned to

/03L-0 on 790510:count-rate Amplifier & Rate of Change Amplifier for Nuclear Source Range Instrument NI-2 Found Inoperable.Caused by Amplifiers Being Out of Tolerance Due to Instrument Drift.Amplifiers Recalbr & Returned to Svc

ML19259C143
Person / Time
Site:	Crystal River
Issue date:	06/04/1979
From:	Cooper J FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19259C137	List: 05000302/LER-1979-050, Forwards LER 79-050/03L-0 05000302/LER-1979-050-03, /03L-0 on 790510:count-rate Amplifier & Rate of Change Amplifier for Nuclear Source Range Instrument NI-2 Found Inoperable.Caused by Amplifiers Being Out of Tolerance Due to Instrument Drift.Amplifiers Recalbr & Returned to
References
LER-79-050-03L, LER-79-50-3L, NUDOCS 7906120407
Download: ML19259C143 (2)

LER-1979-050, /03L-0 on 790510:count-rate Amplifier & Rate of Change Amplifier for Nuclear Source Range Instrument NI-2 Found Inoperable.Caused by Amplifiers Being Out of Tolerance Due to Instrument Drift.Amplifiers Recalbr & Returned to Svc

Event date:
Report date:
3021979050R03 - NRC Website

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.a EVENT Of 5CRieflord Arid eAOS A8t1 CONSEQUENCES g, In Mode 6, while calibrating th eactor Protection System, Surveillance t

Procedure SP-112, it was discovered that the count-rate amplifier and the r;nsi i g rate of change amplifier for Nuclear Source Range Instrument NI-2 were g

B TG 1 inoperable. This created an event contrary to Technical Specification

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Redundancy NA.

No effect upon public health and safety as the plant remained in a safe shutdown condition. This is the second occurrence

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Reference LER 78-39.

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Both amplifiers were calibrated and NI-2 was returned to service at 0735 on 5/10/79 following satisfactory completion of SP-ll2.

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SUPPLEMENTARY INFORMATION Report No.:

50-302/79-050/031-0 Facility:

Crystal River Unit #3 Report Date:

4 June 1979 Occurrence Date:

10 May 1979 Identification of Occurrence:

One (1) neutron flux monitor (NI-2) inoperable contrary to Technical Specification 3.9.2.

Conditions Prior to Occurrence:

Mode 6, refueling.

Description of Occurrence:

In Mode 6, at 0800, while calibrating the Reactor Protection System through Surveillance Procedure SP-ll2, it was dis-covered that the rate of change amplifier and the count-rate amplifier for Nuclear Source Range Instrument NI-2 were out of tolerance. Calibration restored operability and NI-2 was returned to service at 1345 on 5/10/79.

Designation of Apparent Cause:

The cause of this event is attributed to instrument drift in the count-rate and rate of change amplifiers.

Analysis of Occurrence:

No effect upon public health and safety as the plant remained in a safe shutdown condition.

Core alterations were not in progress at the time of this event.

Corrective Action

The count-rate amplifier and the rate of change amplifier were calibrated and NI-2 was returned to service at 1345 on 5/10/79 following satisfactory completion of SP-ll2.

No further corrective action is required.

Failure Data:

This is the second occurrence reported for NI-2.

Reference LER 78-39.

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