ML19256C971
| ML19256C971 | |
| Person / Time | |
|---|---|
| Site: | Hatch  |
| Issue date: | 06/06/1979 |
| From: | Bryan S, Klingler G, Nolan F NRC OFFICE OF INSPECTION & ENFORCEMENT (IE) |
| To: | |
| References | |
| PNO-79-139, NUDOCS 7910150801 | |
| Download: ML19256C971 (1) | |
Text
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PRELIMINARY NOTIFICATION June 6, 1979 PRELIMINARY NOTIFICATION OF EVENT OR UNUSUAL OCCURRENCE -- PNO-79-139 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 as of this date FACILITY:
Georgia Power Corporation Latch, Unit No. 2 Docket No. 50-366 Baxley, Georgia
SUBJECT:
FAILURE OF BACKUP CORE COOLING SYSTEMS On June 3, one of two operating feedwater pumps tripped, causing a low water level reactor trip. The Reactor Core Isolation Cooling (RCIC) turbine started automatically as required but isolated due to a ruptured exhaust diaphragm.
The licensee's investigation revealed an internal problem in the check valve on the turbine exhaust line, apparently causing a temporary flow blockage.
The stud fastening the check valve disc to its operating arm had failed.
Replacement valve internals are enroute to the site and the RCIC will be repaired prior to startup.
The High Pressure Coolant Injection (HPCI) pump was signalled to start automa-tically during this event but did not start because the steam supply valve to HPCI turbine did not open.
The failure to open has been attributed to water in the oil control system. This problem is being corrected. The unit is ei.pectc4 to be restored to service in approximately two days.
There has been no media interest.
Neither the licensee nor the NRC plan to issue a news release.
The State of Georgia has been informed.
Region II (Atlanta) received notification of this occurrence by telecon from the Resident Inspector at 9:15 a.m. on June 4.
This information is current as el 2:00 p.m. on June 5.
Centact:
GKlingler, IE x28019 FNolan, IE x28019 SEBryan, IE x28019 t ).:.;-
Distribution:
Transmitted H St D L,. t t..
Chairman Hendrie Commissioner Bradford S. J. Chilk, SECY Ccmmissioner Kennedy Commissioner Ahearne C. C. Kammerer, CA Ccamissioner Gilinsky
5-ACRS (For Distribution)
Transmitted: MNBB,
P. Bldg //.d,i")
J. G. Davis, IE
.s L. V.
Gossick, EDO H. R. Denton, NRR Regiontr-ICi.40 H. L. Ornstein, EDO R. C. DeYoung, NRR J. J. Fouchard, PA R. J. Mattson, NRR N. M. Haller, MPA
.. Stello, NRR (MAIL)
R. G. Ryan, OSP R. S. Boy, NRR J. J. Cummings, OIA
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H. K. Shapar, ELD SS Bldg }
'!O R. Minogue, ED
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S. Levine, RES
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PRELIMINARY NOTIFICATION
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