05000302/LER-1981-044-01, /01T-0:on 810722,during Performance of Heat Balance Calculations,All Power Range Nuclear Instruments Fund to Be Less Conservative than Administrative Acceptance Criteria for Operability.Caused by Change of Rod Index

/01T-0:on 810722,during Performance of Heat Balance Calculations,All Power Range Nuclear Instruments Fund to Be Less Conservative than Administrative Acceptance Criteria for Operability.Caused by Change of Rod Index

ML20010B043
Person / Time
Site:	Crystal River
Issue date:	08/04/1981
From:	Hernandez V FLORIDA POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010B042	List: 05000302/LER-1981-044, Forwards LER 81-044/01T-0 05000302/LER-1981-044-01, /01T-0:on 810722,during Performance of Heat Balance Calculations,All Power Range Nuclear Instruments Fund to Be Less Conservative than Administrative Acceptance Criteria for Operability.Caused by Change of Rod Index
References
LER-81-044-01T, LER-81-44-1T, NUDOCS 8108130247
Download: ML20010B043 (2)

LER-1981-044, /01T-0:on 810722,during Performance of Heat Balance Calculations,All Power Range Nuclear Instruments Fund to Be Less Conservative than Administrative Acceptance Criteria for Operability.Caused by Change of Rod Index

Event date:
Report date:
3021981044R01 - NRC Website

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60 61 DOCKET NUMBEH 68 63 EVENT DATE 14 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo121 lAt 1225 during performance of SP-312, Peat Balance Calculations, it wan dincovnrna t-hnel lol3l l All Power Range Nuclear Instruments were less conservative than the Administrative l

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SUPPLEMENTARY INFORMATION Report No.:

50-302/81-044/OlT-0 Facility:

Crystal River Unit 3 Report Date:

August 4,1981 Occurrence Date: July 22, 1981 Identification of Occurrence:

All Power Range Nuclear Instruments were less conservative than the f.dministrative Limit for Operability. This event was less conservative than the requirements of Technical Specification 3.3.1.1 and required plant operation per Technical Specification 3.0.3.

Conditions Prior to Occurrence:

Mode 1 Power Operation (82%)

Description of Occurrence:

At 1225 during performance of SP-312, Heat Balance Calculations, it was discovered that All Power Range Nuclear Instruments (N'-5,6,7, & 8) were less conservative than the Administrative Acceptance Criteria of 0.8% Full Power and were therefore declared inoperable.

Maintenance was initiated and three instruments were restored to operable within one hour; full operaaility was achieved at 1340. This cccurrence was an anticipated condition following the change in control rod indexing. The only method for calibration is to raise power, perform SP-312 and then calibrate the nuclear instruments,as required.

Designation of Apparent Cause:

The cause of this event is attributed to a change of rod index during end-of-cycle control rod withdrawal.

Analysis of Occurrence:

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

Corrective Action

Power was held constant during calibration of the instruments.

Technical Specifications Change Request #53 was submitted November 20, 1979. No further corrective action is deemed necessary.

Failure Data:

This was the first occurrence for All Power Range Nuclear Instru-ments,and this is the eighth event reported under the specification, jl