ML20151U917

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PNO-77-071:on 770427,turbine Generator Tripped & Reactor Scrammed as Result of Electrical Phase Differential Across Generator & Main Transformer & Ground on Main Generator. Caused by Leak in Water Hose
ML20151U917
Person / Time
Site: Brunswick Duke Energy icon.png
Issue date: 04/29/1977
From: Gower G, Roy G, Thompson D
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE)
To:
References
PNO-77-071, PNO-77-71, NUDOCS 9809110230
Download: ML20151U917 (1)


Text

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..n hl PRELIMINARY NOTIFICATION ~

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April 29, 1977 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-77-71 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 basically all that is known by IE staff on this date. -

Facility: Carolina Power and Light Company (CP&L)

Brunswick Unit No.1 (DN 50-324)

Subject:

TURBINE GENERATOR FAILURE At 11:41 a.m. on April 27, 1977, with reactor operating at 100% power, the turbine generator tripped and the reactor scrammed as a result of an electrical phase differential across the generator and the main trans-former, and a ground on the main generator. Preliminary investigation indicated that a water hose that supplies water for cooling the stator windings may have developed a leak that shorted one or more conductors; however, the cause and extent of damage to the generator is still unknown.

l The turbine generator is expected to be out of service for at least three weeks.

CP&L is considering making a press release.

-si Region II received notification of'this occurrence from the plant manager via telephone at 0830 hours0.00961 days <br />0.231 hours <br />0.00137 weeks <br />3.15815e-4 months <br /> on April 28, 1977.

Contact:

GCGover, IE x27261 GWRoy, IE x 27261 DThompson, IE x27541 Distribution: TransmittedHSt/.Y

. Chairman Rowden C. C. Kammerer, CA G. F. Murphy, JCAE Commissioner Kennedy S. J. Chilk, SECY H. H. Whiteside, SCNR Commissioner Gilinsky H. R. Myers, HCEE ,,

Transmitted: MNBB [ % : PBldg((YI; SS Bldg /! Y $ ;

! L. V. Gossick, EDO E. G. Case, NRR C. V. Smith, NMSS

{ S. H. Hanauer, EDO H. K. Shapar, ELD J. A. Harris, PA.

W.'G. Mcdonald, MIPC Luge (mail); E. Vol IE

R. G. Ryan, OSP T. J. McTiernan, OIA Region nau, / M ;

PRELIMINARY NOTIFICATION c pi' 9809110230 770429 PDR I&E PNO-77-071, PDR

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