ML20084C706
| ML20084C706 | |
| Person / Time | |
|---|---|
| Site: | Turkey Point  |
| Issue date: | 05/30/1974 |
| From: | Schmidt A FLORIDA POWER & LIGHT CO. |
| To: | Oleary J US ATOMIC ENERGY COMMISSION (AEC) |
| References | |
| RO-250-74-2, RO-251-74-2, NUDOCS 8304080174 | |
| Download: ML20084C706 (1) | |
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RCmD A PU'M P *. UG H T G. M u May 30, 1974 r
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Dear Mr. O' Leary:
N-UNUSUAL EVENT NOS. 250-74-2 AND 251-74-2 TURKEY POINT PLANT UNITS 3 AND 4 TURBINE STOP VALVE MALFUNCTION DUE TO PHOSPHATE BUILDUP In accordance with Technical Specification 6.6.2b, the following unusual event is reported.
l Recently, while conducting a normal shutdown on Unit 3, the turbine stop valves failed to close.
When all efforts to free the stuck valves proved unsuccessful, the valves were disassembled to deter-
- ".ine the cauce of the malfunction.
Duasacably 4evealed phosphate deposits between the valve shafts and bushings.
The j
phosphate deposits were washed off with warm water and the valves l
reassembled.
The valves then operated satisfactorily.
Subse-quently, phosphate buildup problems have been experienced with the l
Unit 4 turbine stop valves.
It was found that most of the phos-phate deposits could be removed by periodically flushing the valve shaft-bushing housing with warm water when the turbine is shutdown.
The turbine manufacturer recommends performing a field modification to the valves which includes installing a larger diameter valve shaft and bushing assembly which is "self-c1 caning" when the valve is cycled.
The modification on the Unit 3 turbine stop valves is scheduled to be accomplished ~during the October, 1974, refueling outage.
The modification on Unit 4 will be scheduled during a maintenance outage this year.
Sincerely yours,
(&g-g/r
,. D. Schmidt Director of' Power Resources DNR/kmw cc:
Mr. Norman C. Moseley Jack R. Newman, Esquire 5.1.81 8304000174 740530 gDRADOCK 05000250 COPY SENf MM -
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