PNO-II-80-164, on 801123,unanticipated Safety Injection Occurred During Testing Involving Loss of Offsite Power. Safeguards Actuation Signal Reset Locally.Caused by Inverter Failure

PNO-II-80-164:on 801123,unanticipated Safety Injection Occurred During Testing Involving Loss of Offsite Power. Safeguards Actuation Signal Reset Locally.Caused by Inverter Failure

ML20204F100
Person / Time
Site:	Sequoyah
Issue date:	11/24/1980
From:	Dance H, Julian C NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
To:
References
11052, PNO-II-80-164, NUDOCS 8304280415
Download: ML20204F100 (1)

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~ 1 PRELIMINARY NOTIFICATION

.. n Ul November 24, 1980 7 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE l PNO-II-80-164 4

i This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance. The information presented i_c as initially received without verification or evaluation :-nd is basically all that is known by IE staff as of this date r

FACILITY: Tennessee _ Valley Authority -

a Sequoyah Unit No. 1

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Jocket No. 50-327 I Chattanooga, Tennessee

SUBJECT:

SAFETY INJECTION DURING LOSS OF SITE POWER TEST 4

During testing on November 23 that involved the loss'of offsite power from 30%

, power, an unanticipated safety injection occurred. The Region II resident inspector ]

j was present in the control room during the event. The test progressed normally.for six minutes before initiation of safety injection. All_ safety equipment functioned as designed and adequate pressurizer level and pressure were maintained. The safeguards actuation signal could not be reset from the control room and had to be reset locally. The test-also identified two centrifugal charging pumps which could .

j not be shut'down from the control room. Preliminary indications are_that the l failure of an inverter may have caused the initiation of safety injection.

- 1 The plant is being held in Mode 3 (Hot standby) to permit an evaluation and corrective )

4 action of the equipment problems.

Media interest has not occurred. Neither TVA nor the NRC plans to issue a news release. The State of Tennessee has been informed.

NRC Emergency Response Center received notification of this occurrence by telephone from the licensee at 2:38 p.m. on November 23. This information is current as of 10:00 a.m. on November.24.

Contact:

C. Julian, RII 242-5549; H. Dance, RII 242-5533 j Distribution:

Chairman Ahearne Transmitted H. St. // N h

, Commissioner Hendrie S. J. Chilk, SECY.

Commissioner Gilinsky Commissioner Bradford C. C. Kammerer, CA ACRS (For Distribution)

Transmitted: MNBB //' N P. Bldg. /J7.'6 3-- IL:XOOS //.'r0(IE:HQ Dist.)

W. J. Dircks, EDO H. R. Denton, NRR

~ ' '

C. Michelson, AEOD R. H. Vollmer, NRR Landow (6 min /page)

J. J. Fouchard, PA F. Schroeder, NRR J. J. Cummings,- OIA.

l N. M. Haller, MPA D. F. Ross, NRR l R. G..Ryan, SP D.'Eisenhut, NRR MAIL H. K. Shapar, ELD S. H. Hanauer, NRR R. Minogue, SD IE:XOOS l Willste /8/d 7 Document Mgt. Br..(For[PDR/LPDR)-l Applicable Resident- Site /2.' / (a J. G. Davis, NMSS S. Ebbin, NSOC T. E. Murley, RES Regional Offices /).O f' Applicabic Utility PRELIMINARY NOTIFICATION -- I hh '

8304280415 801124 l

PDR I8rE PNO-II-80-164 PDR _

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