05000335/LER-1980-064-03, /03L-0:on 801030,during Normal Operation,Turbine Control Sys Malfunction Caused Unexpected Load Decrease Resulting in Reactor Cold Leg Temp Briefly Exceeding Tech Spec Limit.No Cause Determined.Feedback re-established

/03L-0:on 801030,during Normal Operation,Turbine Control Sys Malfunction Caused Unexpected Load Decrease Resulting in Reactor Cold Leg Temp Briefly Exceeding Tech Spec Limit.No Cause Determined.Feedback re-established

ML17266A378
Person / Time
Site:	Saint Lucie
Issue date:	11/28/1980
From:	Pace P FLORIDA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML17209A496	List: 05000335/LER-1980-064, Forwards LER 80-064/03L-0 05000335/LER-1980-064-03, /03L-0:on 801030,during Normal Operation,Turbine Control Sys Malfunction Caused Unexpected Load Decrease Resulting in Reactor Cold Leg Temp Briefly Exceeding Tech Spec Limit.No Cause Determined.Feedback re-established
References
LER-80-064-03L, LER-80-64-3L, NUDOCS 8101050349
Download: ML17266A378 (1)

LER-1980-064, /03L-0:on 801030,during Normal Operation,Turbine Control Sys Malfunction Caused Unexpected Load Decrease Resulting in Reactor Cold Leg Temp Briefly Exceeding Tech Spec Limit.No Cause Determined.Feedback re-established

Event date:
Report date:
3351980064R03 - NRC Website

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caused an unex ected 1 oad decrease which resul ted in reactor cold 1 ea temperature briefly exceeding the Tech Spec 3.2.5 limit of 542'F.

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. operator restored reactor temperature to normal within four minutes.

The turbine control s stem was checked out and the lant was returned to normal full power operation.

The maximum temperature was 542.1'F.

This is the first Tc>542'F LER due to an equipment failure.

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The turbi ne control system (Res tinghouse P-2000 D. E. H. ) unexpectedly transferred the turbine throttle valves from the normal "Sequential" configuration to the "Sin le Valve" mode, and the "S eed Control" feedback loop had dropped out.

"Speed Control" feedback was reestablished and the turbine was returned to the "Sequential" mode.

No cause could be determined.,

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