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Limerick Unit 1 was manually scrammed from … Limerick Unit 1 was manually scrammed from 100% power on 6/23/10 at 2051 hours in accordance with plant procedure OT-112 'Recirculation Pump Trip' when both 1A and 1B recirc pump MG set drive motor breakers were observed to have tripped, resulting in a loss of both reactor recirculation pumps. Preliminary indication is a loss of power to 114A Load Center, caused by 'A' phase overcurrent trip of 13.2 KV feeder breaker (11-BUS-07) to the 114A Transformer and Load Center. The cause of the MG set drive motor breaker trips is under investigation at this time.</br>All Control Rods inserted as required.</br>No ECCS or RCIC initiations occurred.</br>No Primary or Secondary Containment Isolations were received.</br>The plant is currently in Hot Shutdown maintaining normal reactor level with feedwater in service.</br>All systems functioned as required during the transient. The manual scram was characterized as uncomplicated. No PORVs or Safety Relief valves lifted during the transient. Decay heat is being discharged to the condenser via turbine bypass valves. The unit is in a normal shutdown electrical lineup and there was no impact on Unit 2.</br>The electrical supplies for the recirc pump MG sets has been walked down by the licensee and no indication of any damage or electrical faults has been found at this time.</br>The NRC Resident Inspector has been notified and the licensee indicated a media or press release will be made.ted a media or press release will be made. +
00:51:00, 24 June 2010 +
46,042 +
23:57:00, 23 June 2010 +
00:51:00, 24 June 2010 +
Limerick Unit 1 was manually scrammed from … Limerick Unit 1 was manually scrammed from 100% power on 6/23/10 at 2051 hours in accordance with plant procedure OT-112 'Recirculation Pump Trip' when both 1A and 1B recirc pump MG set drive motor breakers were observed to have tripped, resulting in a loss of both reactor recirculation pumps. Preliminary indication is a loss of power to 114A Load Center, caused by 'A' phase overcurrent trip of 13.2 KV feeder breaker (11-BUS-07) to the 114A Transformer and Load Center. The cause of the MG set drive motor breaker trips is under investigation at this time.</br>All Control Rods inserted as required.</br>No ECCS or RCIC initiations occurred.</br>No Primary or Secondary Containment Isolations were received.</br>The plant is currently in Hot Shutdown maintaining normal reactor level with feedwater in service.</br>All systems functioned as required during the transient. The manual scram was characterized as uncomplicated. No PORVs or Safety Relief valves lifted during the transient. Decay heat is being discharged to the condenser via turbine bypass valves. The unit is in a normal shutdown electrical lineup and there was no impact on Unit 2.</br>The electrical supplies for the recirc pump MG sets has been walked down by the licensee and no indication of any damage or electrical faults has been found at this time.</br>The NRC Resident Inspector has been notified and the licensee indicated a media or press release will be made.ted a media or press release will be made. +
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