05000311/LER-1981-080, Forwards LER 81-080/03L-0.Detailed Event Analysis Encl

Forwards LER 81-080/03L-0.Detailed Event Analysis Encl

ML20010E666
Person / Time
Site:	Salem
Issue date:	08/26/1981
From:	Midura H Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010E667	List: 05000311/LER-1981-080, Forwards LER 81-080/03L-0.Detailed Event Analysis Encl 05000311/LER-1981-080-03, /03L-0:on 810807,individual Rod Position Indicator & Control Rod Bank Demand Indicator for Rod 2D2 Were in Disagreement.Caused by Calibr Drift for Signal Conditioning Module.Module Recalibr
References
NUDOCS 8109080122
Download: ML20010E666 (3)

LER-1981-080, Forwards LER 81-080/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3111981080R00 - NRC Website

text

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O PSEG Public Service Electric and Gas Company P.O. Box 168 Hancocks Bridge, New Jersey 08038 Salern Generating Station August 26, 1981..

Mr. Boyce H.

Grier Director of USNRC Office of Inspection and Enforcement 4

Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 81-80/03L Pursuant to the requirements of Salem Generating Station Unit No. 2 Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 81-80/03L. -This report is required within thirty (30) days of the occurrence.

Sincerely yours,

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Midura Manager -

Salem Generating Station CC:

R. A. Uderitz

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I Director, Office of Management Q'

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9 Report Number:

81-80/03L Report Date:

8-26-81 Occurrence Date:

8-7-81 Facility:

Salem Generating. Station, Unit 2 Public Service Electric & Gas Company Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Individual Rod Position Indication - 2D2 - Inoperable.

This report was initiated by Incident Report 81-308 CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 75% - Unit Load 750 MWe DESCRIPTION OF OCCURRENCE:

On August 7, 1981, the control operator noticed that'the individual ~

rod position indicator and control rod bank demand indicator for.

rod 2D2 were in disagreement by greater than + 12 steps.

The individual rod position indicator was declared inoperable at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> and action statement 3.1.3.2.1 was entered.

This occurrence constituted operation in a degraded mode in accordance with technical specification 6.9.1.9.b.

f DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Equipment failure. The individual rod position indicator (IRPI) for control rod 2D2 was not in agreement with the control rod bank demand i

position due to drift in the calibration of the signal conditioning module.

j ANALYSIS OF OCCURRENg:

Technical Specification 3.1.3.2.1 requires that in modes 1 and 2 with a maximum of one rod position indicator per bank inoperable either:

1.

Determine the position of the non-indicating rod (s) indirectly by the movable incore detectors at least once per 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> and immediately after any motion of the non-indicating rod which exceeds 24 steps in one direction since the last determination of the rod's position, or 2.

Reduce thermal power to less than 50% of rated thermal power within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br />.

i

LER 81-80/03L,

CORRECTIVE ACTION

The signal conditioning module for control rod 2D2 was recalibrated satisfactorily and returned to' service.

hetion' statement 3.1.3.2.1 was terminated at 1615 hours0.0187 days <br />0.449 hours <br />0.00267 weeks <br />6.145075e-4 months <br />, August 7, 1981.

FAILURE DATA:

Magnetics, Inc.

Signal Conditioning Module i

Type E2?s6 Prepared By F.

Dickey

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Manager - S61em' Generating Station SORC Meeting No.

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