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June 4, 2011 (WPVI) -- Reactors at an eastern Pennsylvania nuclear plant have shut down unexpectedly three times in the past week, but regulatory authorities say no safety problems have been reported.
The Nuclear Regulatory Commission says Unit 1 of Exelon Nuclear's Limerick Generating Station shut down at 10:15 a.m. Friday. Commission spokesman Neil Sheehan said there were no complications and safety systems responded as expected.
Sheehan says investigators are trying to determine the cause of the latest shutdown, which occurred as operators were doing a test involving the turbine.
"Limerick Unit 2 was 'manually scrammed' from 0% power on 5/30/11 at 1150 hours in accordance with plant procedure OT-112 'Recirculation Pump Trip', when both the '2A' and '2B' Recirculation Pumps tripped. The cause of the pump trip is currently under investigation at this time.
At the time of the 'manual' SCRAM: The Reactor Mode Switch was in 'Startup' Mode 2. All control rods were inserted to 'full-in' position (00). Reactor Shutdown was in-progress in accordance with Plant procedure GP-3 'Normal Plant Shutdown'. No primary or secondary containment isolations occurred. "The plant is currently in HOT SHUTDOWN maintaining normal Reactor level with Control Rod Drive (CRD) hydraulic and Reactor Water Cleanup (RWCU) systems."