ML20151U677
| ML20151U677 | |
| Person / Time | |
|---|---|
| Site: | Saint Lucie, Turkey Point  |
| Issue date: | 05/16/1977 |
| From: | Blackwood E, Sniezek J, Thornburg H NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-77-085, PNO-77-85, NUDOCS 9809110119 | |
| Download: ML20151U677 (1) | |
Text
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_ PRELIM _INARY N..OTIFICATION N%
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1, 16, 1977 "
k7CMt" PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE--PNO-77-85
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This preliminary notification constitutes EARLY notice of an event of POSSIBLE safety or public interest significance.
The information presented 1a as initially received without verification or evaluati_on and is basically 621 that is known by IE staff on this date.
Facility:
Florida Power and Light Company Turkey Point Unit No. 3, 4 and St. Lucie Unit No. 1 (Florida)
Subject:
FP&L SYSTEM BLACK 0UT
~
Turkey Point Unit No. 3 reactor tripped from 100% of rated power at 10:09 a.m. on 5/16/77 when the reactor protection system received a spurious signal that the 3C Reactor Coolant System Pump had tripped.
At 10:24 a.m. low voltage,on the grid caused Turkey Point fossil Units 1 and 2 to trip and a loss of off site power occurred. The diesels started and cooldown of the reactor was in progress using emergency equipment. The loss of voltage also caused a voltage oscillation at St. Lucie Unit No. I which was manually tripped to prevent equipment damage. Diesel generators were reported to be operating normally at St. Lucie and Turkey Point.
Turkey Point Unit No. 4 had been shutdown for refueling prior to the blackout.
The blackout is reported to include most of the FP&L system. Turkey Point Unit No. 3 trip was caused by a reactor protection relay coil f ailing open and inputting a reactor trip signal.
i
%Eb There have been no other equipment or system failures at the St. Lucie or Turkey Point facilities reported. No release of radioactivity was experienced.
I Power has been restored to the System grid from Turkey Point fossil Units 1 and 2.
Turkey Point Unit No. 3 and St. Lucie Unit No. I are preparing to resume operation.
Media interest has occurred. NRC does not plan to issue a press release.
s-Region II received notification of this occurrence by telephone at 12:30 p.m. on 5/16/77.
Region II inspectors are enroute to both the St. Lucie _,
and Turkey Point sites.
Contact:
EBlackwood, IE x27451 JSniezek, IE x27451 HThornburg, IE x27265 Distribution: Transmitted H St bb N3Y Chairman Rowden C. C. Kammerer, CA G. F. Murphy, JCAE Commissioner Kennedy S. J. Chilk, SECY H. H. Whiteside, SCNR Commissioner Gilinsky q g 3, H. R. Myers, HCEE, Transmitted: MNBB N P Bldg [.* 2. Y SS Bldg f/ L 5 L. V. Gossick, EDO E. G. Case, NRR C. V. Smith, NMSS S. H. Hanauer, EDO 6
J. A. Harris, PA
/
W. G. Mcdonald, MIPC Luge (MAIL)
E. Volgenau, IE l
I R. G. Ryan, OSP T. J. McTiernan, OIA Region ((((j>/hh l
H. K. Shapar ELD J! T 7 I PRELIMINARY NOTIFICATION l
9809110119 770516 PDR I&E 1
PNO-77-005 PDR l
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