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Wolf Creek reactor trips following refueling outage

Wolf Creek Nuclear Power Plant

Caption: Wolf Creek nuclear power plant  

The Wolf Creek nuclear power plant in Kansas shut down as workers were ramping up the reactor.
Plant staff was in the process of transferring from main feedwater bypass feed regulating valve control, used for low power control, to main feedwater regulating valve control as part of power ascension following completion of a refueling outage. The reactor was approximately 22 percent when the main feedwater regulating valve for steam generator C went to about 80 percent opened and caused an overfeed of the generator. Workers manually shut down the reactor.
Operators said in a report to the U.S. Nuclear Regulatory Commission that the valve did not function properly to control steam generator level and did not close on the feedwater isolation signal. There was no danger to the public or to workers.
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