ML20086D590

AO 72-16:on 721227,startup Transformer Failed,Resulting in Loss of Normal Power.Incident Under Investigation. Replacement Startup Transformer Procured & Will Be Installed in Near Future

ML20086D590
Person / Time
Site:	Vermont Yankee
Issue date:	12/28/1972
From:	Rosalyn Jones VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20086D587	List: ML20086D590 ML20086D593 ML20086D596
References
AO-72-16, VYV-2389, NUDOCS 8312020411
Download: ML20086D590 (1)

Text

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OWER COnFORA ON VERhiONT YANEEE NUOLR ATE * *r SEVENTY SEVEN OROVE STMEET RuTtAw, VrmMont osvot vrv-2389 P. O. DOX 157 vsrmon. vermont CO354 1

December 28, 1972 a

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United Sectes Atomic Energy Cor=ission Directorate of Engulatory Operations Region I 970 Broad Strcot i Ecvark..Hcv Jorney 07102 raram.WCEt Operating Licenso I2R-28 Dochot 1:o. 50-271 g Abnormal occurrenco Ho. A0-72 i / .

Centic= cat As defined by Technical Spacifications for the Vor=ont Ycnhco

-e l Mucicar l'over Gtction, Coction 6.7. A.c, vs are reporting the folicwing

• V Abnormal occurrence as 40-72-19 and confiratng our toicphone conversation I with your tir. Carlson.

j At 1738 on Decc bar 27, 1972, with the picnt. operating et appronicately

^j 637. power, the Startup Trcnofor:sr failed resulting in a loss of.norcsi l power (12 P) . This I2;? resulted in excceding a liciting conditi.m of '

operation cs defined in Section 3.9. A.4.a of Technical Specificattuno.

{

1 The IEP caused a reactor acrca .fo11 cued by a main oteam lina isolation.

(4, Within 10 occonds of the incident both diccol 'ccacratora vero cupplying their

{l respectivo busses. Following tha incident a picat cooldcun "insido the usin-7 stenn inointion valves" uca conducted, with no oignificant trenaients. The j incident to under invcatigation and review cad va vill provida details at.

the cc=piction of this review.

y P

hi A replacecent neartup transfortar has been procured and will be installed in the near future.

Very truly yours, K ' PM CMMM 1

8312020411 730905 ' + ' '

! gDRADOCK 05000271 PDR -

Eobart F. J cs Picnt Superintendent. .

l PET /kbd .,..

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