ML20009A887
| ML20009A887 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 07/06/1981 |
| From: | Dance H, Shymlock M NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II) |
| To: | |
| References | |
| PNO-II-81-048, PNO-II-81-48, NUDOCS 8107140415 | |
| Download: ML20009A887 (2) | |
Text
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PRELIMINARY NOTIFICATION July 6, 1981 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE PNO-II-81-48 This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance.
The information presented is as initially received without verification or evaluation and is basicallM4-that is known by IE staff as of this date.
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j FACILITY: Virginia Electric and Power Ccmpany North Anna Unit 2 i
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3gggts-d Docket No. 50-339 jull Mineral, Virginia
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SUBJECT:
FAILURE OF B PHASE MAIN TRANSFORMER
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A failure of the B phase main transformer at. 7:23 a.m. 4 1
ed in a generator and reactor trip from 17% power.
The failure os "a br former caused an oil originated fire in the transformer trea on the northwest exterior corner wall of the turbine building.
Unit 1 and 2 containment buildings are located on the opposite side of the turbine building. The plant and three local volunteer fire departments responded. All fires were out by 8:45 a.m.
The fire shorted the overhead output lines of C Reserve Station fransformer and resulted in the transformer tripoing at 7:45 a.m.
One diesel generator automatically started and supplied power to the associated emergency bus.
A safety injection from the existing Low Low Tave coincident with a spurious High Steam Flew was received and manually reset after two minutes.
The reactor safety systems functioned as designed.
A fault in the transformer output bushing is suspected as the cause of the failure.
No personnel injuries or radioactivity releases occurred.
A two week outage to replace the transformer is anticipated.
Unit 1 continued to operate and was not affected.
Power was reduced to 30% as a precautionary measure.
Media interest occurred.
The licensee issued a press release.
No press release was l
issued by the NRC. The, Commonwealth of Virginia was informed.
The NRC Emergency Response Center received notification of this occurrence by teichene from the. licensee at 7:29 a.m. cn July 3.
Region II dispatched, on July 3, three inspectors and a supervisor to review the event.
This information is curreni. as of 8:30 a.m. on July 6.
Contact:
M. D. Shymlock, RII 242-4186; H. C. Dance, RII 242-5540 Distribution:
Transmittel H. St.
Chairman Palladino Commissioner Ahearne S. J. ChilA, SECY Commissioner Gilinsky Commissioner Bradford C. C. Kammerer, CA ACRS (For Distribution)
Transmitted:
MNBB P. Bldg. /// c2 O IE:TAS (IE:HQ Dist.)
ti. J. Dircks, EDO H. R. Denton, NRR C'. Michelson,.AE00 R. H. Vollmer, NRR Landow (6 min /page)
J. J. Fouchard, PA T. E. Murley, NRR J. J. Cummings, OIA 0[
N. M. Haller, MPA R. Mattson, NRR 8107140415 810706 gi k PDR I&E PNO-II-81-048 PDR
M. K. Shapar, ELD D. Eisenhut, NRR MAIL
' Air Rights S. H. Hanauer, NRR IE:TAS G. d. Kerr, SP Willste Document Mgt. Br. (PDR)
Applicable Resident Site J. G. Davis, N.lSS S. Ebbin, NSOC Regional Offices R. Minogue, RES Applicable Utility NSAC INP0 Facsimile 415/856-6621 Facsimile 404/952-6728 Confirmation 415/855-2998 Confirmation 404/953-5348 PRELIMINARY NOTIFICATION
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