05000272/LER-1980-001, Forwards LER 80-001/03L-0

Forwards LER 80-001/03L-0

ML18081A960
Person / Time
Site:	Salem
Issue date:	01/24/1980
From:	Librizzi F Public Service Enterprise Group
To:	Grier B NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML18081A961	List: 05000272/LER-1980-001, Forwards LER 80-001/03L-0 05000272/LER-1980-001-03, /031-0:on 800101,axial Flux Difference Determined to Be Outside Target Band.Caused by Signal Output Failing High.Signal Isolator Was Replaced & Axial Flux Difference Monitor Recalibr
References
NUDOCS 8001290295
Download: ML18081A960 (3)

LER-1980-001, Forwards LER 80-001/03L-0

Event date:
Report date:
2721980001R00 - NRC Website

text

'*-*

PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 '430-7000 Mr. Boyce H. Grier Director of USNRC Off ice of Inspection and Enforcement Region 1 631 Park Avenue January 24, 1980 King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-70 DOCKET NO. 50-272 REPORTABLE OCCURRENCE 80-01/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 80-01/03L.

This report is required within thirty (30) days of the occurrence.

Sincerely yours,

/ ) Vli-,_..~)-v---.

F. P. Librizzi General Manager -

Electric Production CC:

Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control

( 3 copies)

,,f,t

\\E\\HSOI' su111n.

5

%-2001 121JOMI 2-78

Report Number:

Report Date:

Occurrence Date:

Facility:

80-0l/03L 1/24/80 1/01/80 Salem Generating Station Public Service Electric & Gas Company Hancock's Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

Exceeding Axial Flux Difference Target Band CONDITIONS PRIOR TO OCCURRENCE:

Unit in Mode 1 reactor power at 40%, producing 350 mW DESCRIPTION OF OCCURRENCE:

At 1320 hours0.0153 days <br />0.367 hours <br />0.00218 weeks <br />5.0226e-4 months <br />, the axial flux difference (AFD) was determined to be outside its target band,+ 5% of target value (T.S. 3.2.1).

Initial investigation indicated the summing unit had failed.

The AFD monitor was declared inoperable and power secured to the unit.

Instrument and controls personnel were summoned to effect repairs.

At the start of the troubleshooting process, the unit was re-energized and appeared to function properly.

It was declared operable at 1450 hours0.0168 days <br />0.403 hours <br />0.0024 weeks <br />5.51725e-4 months <br />.

At 1655 hours0.0192 days <br />0.46 hours <br />0.00274 weeks <br />6.297275e-4 months <br />, the same symptoms appeared and the unit was declared inoperable a second time.

Subsequent troubleshooting identified the failed component to be the signal isolator.

The signal isolator separates the loop 13 6T Tavg signal from the AFD monitor.

After replacement and recalibration, the monitor was declared operable at 1835 hours0.0212 days <br />0.51 hours <br />0.00303 weeks <br />6.982175e-4 months <br />.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The signal isolator failed.

ANALYSIS OF OCCURRENCE:

Since reactor power was only 40%, no adverse conditions existed.

Reactor power was maintained to continue the physics testing program at 40% power.

CORRECTIVE ACTION

The signal isolator was replaced in kind and the AFD monitor was calibrated.

.... /'

LER 80-01/03L FAILURE DATA:

Hagan Signal Isolator Model 131-110 Prepared By M. J. Murphy SORC Meeting No.

03-80 Station