Springford Reporter Valley Item > News
Wednesday, June 1, 2011
By Evan Brandt
The same nuclear reactor at Exelon’s Limerick Generating Station that shut down unexpectedly early Sunday morning did so again Monday, according to an official at the Nuclear Regulatory Commission.
Neil Sheehan, a spokesman for the NRC office in King of Prussia, wrote in an e-mail that “
“As the plant was being started up, two reactor re-circulation pumps tripped. The reactor was at zero-percent power when this occurred,” Sheehan wrote.
According to NRC documents, the second “scram” occurred at 11
“Licensee is investigating a potential issue with the relay logic associated with the scram bypass feature. Offsite power circuits and emergency diesel generators are operable and available. There was no increase in plant risk associated with this event,” read an update in status posted on an NRC daily log of events.
It was the second time in less than 36 hours that the reactor had to be shut down unexpectedly.
Unit 2 shut down at 5
The company has not yet released any complete explanation for the first “scram.”
On Sunday, Sheehan said that when a reactor “scrams,” the NRC begins to analyze if a unit has more than three scrams in its 7,000 hours of operations in a service quarter.
In Tuesday’s e-mail he wrote
In February, the same reactor, Unit 2, shut down unexpectedly due to problems with systems related to recirculating pumps. That shutdown lasted for more than two days.
According to NRC documents, Unit 1, experienced a scram on June 23, 2010, also because of problems with the re-circulation pumps.
© 2011 Montgomery News, a Journal Register Property
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