05000311/LER-1981-028, Forwards LER 81-028/03L-0.Detailed Event Analysis Encl

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Forwards LER 81-028/03L-0.Detailed Event Analysis Encl
ML20005B064
Person / Time
Site: Salem PSEG icon.png
Issue date: 06/18/1981
From: Uderitz R
Public Service Enterprise Group
To: Grier B
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20005B065 List:
References
NUDOCS 8107060273
Download: ML20005B064 (3)
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LER-1981-028, Forwards LER 81-028/03L-0.Detailed Event Analysis Encl
Event date:
Report date:
3111981028R00 - NRC Website
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text

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PSEG Public Service Electric and Gas Company 80 Park Plaza Newark, N.J. 07101 Phone 201/430-7000 June 18, 1981 Mr. Boyce H.

Grier Director of USNRC Office of Inspection and Enforcement Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

LICENSE NO. DPR-75 DOC't;ET NO. 50-311 REPORTABLE OCCURRENCE 81-28/03L Pursuant to the requirements of Salem Generating Station Unit No. 2 Technical Specifications, Section 6.9.1, we are submitting Licensee Event Report for Reportable Occurrence 81-28/03L.

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

Sincerely yours, C-WhWW R.

A.

Uderitt General Manager -

Nuclear Production CC:

Director, Office of Inspection and Enforcement (30 copies)

Director, Office of Management Information and Program Control (3 copies)

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Report Number:

81-28/03L Report Date:

June 18, 1981 Occurrence Date:

6-3/4-81 Facility:

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

Onsite Power Distribution Systems LONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx Power 20% - Unit Load 110 MW DESCRIPTION OF OCCURRENCE:

On June 3, 1981, during an accident loading sequence subsequent to a cafety injection actuation, the 4KV feeder breaker, 2B4D, tripped when the No.24 Fan Coil Unit was started.

When breaker 2B4D tripped the 460/230 Volt 2B Vital Buses were de-energized.

Action Statement 3.8.2.la was entered at 0445 due to the loss of the 2B 460/230 Volt Vital Bus.

Number 24 Fan Coil Unit was declared inoperable and Action Statement 3.6.2.3a was entered at 0645 hours0.00747 days <br />0.179 hours <br />0.00107 weeks <br />2.454225e-4 months <br /> since it was assumed at this time that an electrical fault in the motor caused the 2B4D breaker to trip.

This occurrence constituted operation in a degraded mode IAW Technical Specification 6.9.1.9b.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

Design error.

The development of the vercurrent relay settings for 2B4D and 2C4D did not consider simultaneous operation of both fan coil units on that bus in fast speed.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.8.2.1 requires with less than all A.C. Vital Buses operable or energized, restore the inoperable buses to operable and energized status within 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> or be in at least hot standby within the next 6 hours6.944444e-5 days <br />0.00167 hours <br />9.920635e-6 weeks <br />2.283e-6 months <br /> and in cold shutdown within the following 30 hours3.472222e-4 days <br />0.00833 hours <br />4.960317e-5 weeks <br />1.1415e-5 months <br />.

1

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LER 81-28/03L 6/18/81 i

CORRECTIVE ACTION

r Immediately following the incident DCR-2EC-1243 was issued to provide the proper level of overcurrent protection for the starting of the cecond fan cooling unit from the same bus.

These settings were cdjusted on breakers 2B4D and 2C4D, feeder breakers for their respective 460/230 Volt Vital Buses.

Both breakers tested satisfactorily.

DCR-LED-0156 was issued for the same purpose on Unit No. 1 and this work was completed October 16, 1980.

At 0630 hours0.00729 days <br />0.175 hours <br />0.00104 weeks <br />2.39715e-4 months <br /> on June 3, 1981, Action Statements 3.8.2.la was termi-nated.

Action Statement 3.6.2.3a was terminated at 2125 hours0.0246 days <br />0.59 hours <br />0.00351 weeks <br />8.085625e-4 months <br /> on June 3, 1981.

FAILURE DATA:

Not Applicable

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4 s

Prepared By J. J. Espey Manager - Sdlem Gbnerating Station SORC Meeting No.

81-50 l

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