ML20151C078

Special Rept SR-88-006-00:on 880616,emergency Diesel Generator B Tripped Due to Personnel Error.Caused by Failure to Raise Load within 5 S.Operating Procedure OP-9-002 Reviewed & Considered to Adequately Address Operation

ML20151C078
Person / Time
Site:	Waterford
Issue date:	07/15/1988
From:	Carns N LOUISIANA POWER & LIGHT CO.
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
SR-88-006-00, SR-88-6, W3A88-0079, W3A88-79, NUDOCS 8807210216
Download: ML20151C078 (3)

Text

____

Ref:

10CFR50.36(c)(2)

Q l OUISI AN A POWE R & LIGH T WATERFORO 3 SES

• PO. BOX 8 + KILLONA. LA 700664751 E d s ErsS $

July 15, 1988 W3A88-0079 A4.05 QA U.S. Nuclear Regulatory Commission ATTENTION:

Document Control Desk Washington, D.C.

20555

SUBJECT:

Waterford 3 SES Docket No. 50-382 License No. NPF-38 Reporting of Special Report Attached is Special Report Number SR-88-006-00 for Waterford Steam Electric Station Unit 3.

This Special Report is submitted per 10CFR50.36(c)(2) and Technical Specifications 4.8.1.1.3 and 6.9.2.

Very truly yours, 07)(L /

/

N.S. Carns Plant Manager - Nuclear NSC/WMCark Attachment cc:

R.D. Martin, NRC Resident Inspectors Office, INPO Records Center (J.T. Wheelock), E.L. Blake, W.M. Stevenson, D.L. Wigginton 8807210216 880715

(#h PDR ADOCK 05000382

}

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PDC "AN EQUAL OPPORTUNITY EMPLOYER" l

c.

SPECIAL REPORT SR-88-006-00 Emergency Diesel Generator Invalid Failure Due to Fersonnel Error.

INTRODUCTION At 0942 hours0.0109 days <br />0.262 hours <br />0.00156 weeks <br />3.58431e-4 months <br /> on June 16, 1988, during the performance of the Diesel Operability Surveillance, Emergency Diesel Generator (EDG) B tripped due to actuation of the reverse power relay. Troubleshootite a_

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• discover any equipment problems and it was concluded the opera trainee who manually started the EDG did not load it quickly ecough to prevent a reverse power trip.

Since this is an invalid failure there is no effect on the relfalility of EDG B and the testing frequency remains or.ce per 31 days.

NARRATIVE At 0942 hours0.0109 days <br />0.262 hours <br />0.00156 weeks <br />3.58431e-4 months <br /> on June 16, 1988, Waterford Steam Electric Station Unit 3 was operating at 90% power when Emergency Diesel Generator (EDG) B tripped due to personnel error. During the performance of Surveillance Procedure OP-903-068, "Emergency Diasel Generator Operability Verification", EDG B output breaker l

opened shortly after closing the breaker.

A generater fault was indicated due j

to a Reverse Power Relay (RPR) trip.

The RPR is designed to provide anti-motoring protection of the generator. When an EDG is connected to the grid, it must be loaded to 100 KW within 5 seconds or the RPR will trip the

EDG, EDG B was declared inoperable and the action statement of Technical Specification 3.8.1.1 was entered.

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Condition Identification #256717 was issued to investigate the EDG and its associated circuitry.

No equipment problems were discovered and it was concluded that the only credible cause of the trip was due to failure to raise load within 5 seconds.

The individual performing the manual EDG start is enrolled in a license training program and was performing under the supervision of a licensed operator as authorized by 10CFR55.13. After troubleshooting, Surveillance Procedure OP-903-068 was successfully performed and EDG B was declared operable at 1700 hours0.0197 days <br />0.472 hours <br />0.00281 weeks <br />6.4685e-4 months <br />. Although the EDG was out of service for approximately 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> it could have been quickly restored to service if a loss of offsite power had occurred. Operating Procedure OP-9-002, "Emergency Diesel Generator" has been reviewed and is considered to adequately address this aspect of EDG operation.

The unsuccessful loading attempt due to operator action has been classified as an invalid failure in accordance with Regulatory Guide 1.108, Revision 1, Section C.2.e.(2).

There has never been a valid failure of EDG B since the operating license was issued.

The surveillance test interval required by Technical Specification Table 4.8-1 has always been "at least once per 31 days" since issuance of the operating license.

The testing interval is not affected by this event. Since this was an invalid failure due to operator error, there is no effect on the reliability of EDG B.

PLANT CONTACT R. S. Starkey, Operations Superintendent, 504/464-3178.

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