05000311/LER-1981-124, Forwards LER 81-124/03L-0.Detailed Event Analysis Encl

Forwards LER 81-124/03L-0.Detailed Event Analysis Encl

ML20039G234
Person / Time
Site:	Salem
Issue date:	12/23/1981
From:	Midura H Public Service Enterprise Group
To:	Haynes R NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20039G235	List: 05000311/LER-1981-124, Forwards LER 81-124/03L-0.Detailed Event Analysis Encl 05000311/LER-1981-124-03, /03L-0:on 811123,during M3J Maint Test, Undervoltage Relay on 2C Vital Bus Was Discovered Actuating at 35% Trip Setpoint Value.Caused by Mechanical Sticking of Relay.Relay Cleaned & Tested Satisfactorily
References
NUDOCS 8201150408
Download: ML20039G234 (3)

LER-1981-124, Forwards LER 81-124/03L-0.Detailed Event Analysis Encl

Event date:
Report date:
3111981124R00 - NRC Website

text

'O PSIRG Pubhc Serv:ce Electnc and Gas Company P O Bo< #168 Hancocks Bndge. New Jersey 08038 December 23, 1981 (9

Mr.

R.

C. Haynes Director of USNRC UECEWED 9 y.

Office of Inspection and Enforcement 9

i Region 1

1. NI 3 ;g626 L

631 Park Avenue R ae k

eeuw %ma King of Prussia, Pennsylvania 19406 4

• mam g

/

Dear Mr. Haynes:

Ca LICENSE NO. OPR-75 DOCKET NO. 50-311 REPORTABLE OCCURRENCE 81-124/03L Pursuant to the requirements of Salem Generating Station Unit No. 2, Technical Specifications, Section 6.9.1.9.a, we are submitting Licensee Event Report for Reportable Occurrence 81-124/03L.

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

Sincerely yours,

,f/~f

?

H.

J.

Midura General Manager -

Salem Operations CC:

Distribution

,f

/

8201150408 811223 PDR ADOCK 05000311 S

PDR

1. gx m enorav co;*

e 6ih.mm a

r Report Number:

81-124/03L

' Report Date: 23-81 Occurrence Date:

11-23-81 I

Facility:

Salem Generating Station, Unit 2

.Public Service Electric & Gas Company

'Hancocks Bridge, New Jersey 08038 IDENTIFICATION OF OCCURRENCE:

2C Vital Bus Undervoltage Relay - Inoperable.

This report was initiated ~by Incident Report 81-476.

CONDITIONS PRIOR TO OCCURRENCE:

Mode 1 - Rx 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 s

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, s

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

t 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, cperation may proceed untii performance m

of the next' required channel functional test, provided the inoperable' channel is placed in the tripped condition within

/

' ~

one hour.

f I..

k s

e m

h l

f.,

+.,m..

3, ~.

- m,

LER 81-124/03L QRRECTIVE 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 nnit.

FAILURE DATA:

General Electric Co.

Disc-operated Relay IAV-74A Prepared By F.

Dickey

/c/, h,. Sh WJ Generai Manager -

Salem Operations SORC Meeting No.81-132