05000272/LER-1981-124, Forwards LER 81-124/03X-1.Detailed Event Analysis Encl

Forwards LER 81-124/03X-1.Detailed Event Analysis Encl

ML20041A679
Person / Time
Site:	Salem
Issue date:	12/31/1981
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20041A675	List: 05000272/LER-1981-124, Forwards LER 81-124/03X-1.Detailed Event Analysis Encl 05000272/LER-1981-124-03, /03X-1:on 811123,undervoltage Relay on 2C Vital Bus Was Actuating at 35% Instead of 70% Trip Setpoint Value. Caused by Mechanical Sticking.Undervoltage Relay Cleaned & Tested
References
NUDOCS 8202220402
Download: ML20041A679 (3)

LER-1981-124, Forwards LER 81-124/03X-1.Detailed Event Analysis Encl

Event date:
Report date:
2721981124R00 - NRC Website

text

- _ - - _ _ _ - _.

O PSEG Public Service Electric and Gas Company P.O. Box 168 Hancocks Bridge, New Jersey 08038 Salem Generating Station December 23, 1981 Mr.

R. C.

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

Dear Mr. Haynes:

LICENSE NO. DPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 81-124/03X-1 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 81-124/03X-1.

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

Sincerely yours, E V H.

J. Midura General Manager -

Salem Operations CC:

Distribution fin The Energy People 952189 02.9A11140 B202220402 820107 PDR ADOCK 05000EH GW eR _ _..

PDR

Report Number:

81-124/03X-1 Report Date:

12-23-81 Occurrence Date:

11-23-81

. Facility:

Salem _ Generating Station, Unit 2 Public Service Electric & Gas Company-Hancocks Bridge, New Jersey G0038 IDENTIFICATION OF OCCURRENCE:

2C Vital' Bus Undervoltage Relay - Inoperable.

This report was initiated by Incident Report 81-476.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 -1Rx Power 100% - Unit Load 1150 MWe DESCRIPTION OF OCCURRENCE:

On November 23, 1981, during the performance of the M3T maintenance surveillance test, it.was discovered that the_undervoltage relay on the 2C vital bus was actuating at 35% instead of the'70% trip-setpoint value.

The minimum required trip setpoint value is 65%.

The relay was placed in-the tripped condition, and at 1557 hours0.018 days <br />0.433 hours <br />0.00257 weeks <br />5.924385e-4 months <br /> Action Statement 3.3.2.a Action 14 was entered.

~

This occurrence constituted operation in a degraded mode in accord-ance with Technical Specification 6.9.1.9.a.

DESIGNATION OF APPARENT CAUSE OF OCCURRENCE:

The undervoltage relay actuated at 35% instead of the 70% trip setpoint value-because it was mechanically sticking.

ANALYSIS OF OCCURRENCE:

Technical Specification 3.3.2.a Action 14 requires:

With the number of operable channels one less than the total number of channels, operation may proceed until performance of the next required channel functional test, provided the inoperable channel is placed in the tripped condition within one hour.

4 4

- LER 81-124/03X-1

+

i 4

CORRECTIVE ACTION

The undervoltage relay was cleaned and tested satisfactorily.

At 0915 hours0.0106 days <br />0.254 hours <br />0.00151 weeks <br />3.481575e-4 months <br />,' November 24, 1981, Action Statement-3.3.2.a Action 14 was-terminated. 'This is the first occurrence.of its. type on this unit.

FAILURE DATA :

r.

General Electric Co.

Disc-operated Relay 4

IAV-74A i

4 1

Prepared By F.

Dickey J'/

+V V

Generar Manager -

Salem-Operations SORC Meetit.J.No.81-132 l

e i

s l

l k

t i

l t

1 i

i