ML19031B513

Licensee Event Report 1978 for Reportable Occurrence 78-36/03L Re Vital Bus Under Voltage Relay Setting Outside Technical Specification Limit

ML19031B513
Person / Time
Site:	Salem
Issue date:	07/20/1978
From:	Librizzi F Public Service Electric & Gas Co
To:	Grier B NRC/IE, NRC Region 1
References
LER 1978-036-03L
Download: ML19031B513 (3)

Text

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(} PS~G Public Service Electric and Gas Company 80 Park Place Newark, N.J. 07101 Phone 201 /622-7000

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July 20, 1978

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o-Mr. Boyce H. Grier -f

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Director of USNRC OJ r-  ::.Orri toC:c::  : i\.) : ,:So Office of Inspections and Enforcements  :::0-1(/)

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Dear Mr. Grier:

l'T1 w _,v.i z LICENSE NO. DPR-70 DOCKET NO .. so~212 REPORTABLE OCCURRENCE 78-36/03L Pursuant to the requirements of Salem Generating Station Unit No. 1 Technical Specifications, Section 6.9.1.9.b, we are submitting Licensee Event Report for Reportable Occurrence 78-36/03L. This report is required within thirty (30) days

~f the occurrence.

Sincerely yours, 214~ *,*

F. P. Librirlf General Manager -

Electric Prqduction

. \;<J?i CC: Director, Office of Inspection II~\ \\\_\;.

and Enforcement (30 copies) \\~::§~f~\..

Director, Office of Management (\'():\ V.

Information and Program Contro~ \~\\\ \)\'

( 3 copies)

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R~port Number: -36/03L

.Report Date: 7/20/78 Occurrence -Date: 7/5/78 Facility: Salem Generating Station Public Service Electric & Gas Company Hancocks Bridge, New Jersey* 08038 IDENTIFICATION OF OCCURRENCE:

Vital Bus Under Voltage Relay Setting Outside Te6hnical Specification Limit.

CONDITIONS PRIOR TO OCCURRENCE:

Operational Mode 1 - Reactor Power 93%

DESCRIPTION OF OCCURRENCE:

At 1515 hours0.0175 days <br />0.421 hours <br />0.0025 weeks <br />5.764575e-4 months <br />, while performing the-functional test of the lC Vital Bus Under Voltage Relay, it was determined that the setpoint had drifted to less than the > 65% of bus voltage value allowed by Tech-nical Specification 3-. 3. 2 .1. Action Statement No. 14 for LCO 3.3.2.1 was implemented. By 2130 hours0.0247 days <br />0.592 hours <br />0.00352 weeks <br />8.10465e-4 months <br />, relay personnel had recali-brated the under voltage relay and Action Statement No~ 14 for LCO 3.3.2.1 was te~minated.

DESI.GNAT ION OF APPARENT CAUSE OF OCCURRENCE:

The cause of this event was instrument drift which resulted in the tr{p setpoint being outside the allowed Technical Specification value.

This is the first occurrence of instrument drift on under voltage relays.

ANALYSIS OF OCCURRENCE:

Action Statement No. 14 for LCO 3.3.2.1 states that with the number of operable channels one less than the total number of channels, operations may proceed until the performance of the next required channel functional test, provided the inoperable channel is placed in the tripped condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br />. - lC Vital Bus Under Voltage was placed in the tripped l*

condition within 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and remained in that condition until it was returned to operable status. Total:.inoperability was less than 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />.

CORRECTIVE ACTION:

Relay personnel were notified" and the lC Vital Bus Under Voltage relay was reset. Completion of surveillance test confirmed operability.

FAILURE DATA:

N/A Prepared by T. L. Spencer

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Manager'- S~m Generating Station SO.RC Meeting No. 46-78

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~ . NAC FORM 366 (7-77)

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• LICENSEE EVENT REPORT

.. . . CQNTROL B_LOCK: I 1

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10 (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION!

[9Ji] I N IJ I s I G I s. I 1 IG)I o I oI -1 o I o I o I o I o I - I o I o IG)I 4 I 1 I 1 I i I 1 101 I I0 7* 8 9 LICENSEE CODE 14 :s LICENSE NUMBER 25 26 LICENSE TYPE JO 57 CAT 58 CON'.T

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7. I oI s I EVENT DATE 7 I a @I a I 1 I 2 I o I 74 75 REPORT DATE 1 I a IG) 80 EVENT OESCRIPTlON ANO PROBABLE CONSEQUENCES@

I Dtiring functional test on the lC vital bus under voltage relay, the C£II). I trip setpoint was determined.to be less than allowed by T.S. Channel *I

[TIIJ I was p;Laced in tripped condition and remained in that condition until IIIIJ I recalibration was completed. This is the first occurrence of this*

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44 47 CAUSE OESCRIPTlON ANO CORRECTIVE ACTIONS @

I The cause of this event was instrument drift that lowered the under *I 1JID voltage relay setpoint to_ less than allowed by T.S. Relay personnel

()))) recalibrated the UV relay. Surveillance testing confirmed operability. I OJI]

IIEla 1 9 80 FACILITY 13Q\ ~00~ ~

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[ill] w@ W@)I N/A N/A 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES ~

NUMBER ~TYPE . *oESCRIPTION

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