Leak found at Davis Besse Nuclear Power Plant during restart from month-long outage

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Workers  at the Davis-Besse Nuclear Power Plant were getting ready to restart the plant after a month-long maintenance shutdown, when leakage was identified from a 3/4-inch weld during Reactor Coolant System (RCS) walkdown inspections.

The leakage amount was approximately 0.1 gpm spray.

“During the performance of MODE 3 engineering walkdown inspections in accordance with procedure DB-PF-03010 (ASME Section III, Class 1 and 2), with the RCS at Normal Operating Temperature and Pressure, a pressure boundary leak was identified on the Reactor Coolant Pump (RCP) 1-2 1st seal cavity vent line upstream weld of 3/4 inch small bore pipe socketweld at a 90 degree elbow between the RCP pump and valve RC-407 (1st Seal Cavity Vent Isolation). The plant was in MODE 3 at Normal Operating Pressure and Normal Operating Temperature (NOP/NOT) for the inspections.

“The plant entered Technical Specification (TS) Limiting Condition for Operation (LCO) 3.4.13, ‘RCS Operational Leakage,’ Condition B and procedure DB-OP-02522. ‘Small RCS Leaks,’ abnormal operating procedure. Plant cooldown to comply with LCO 3.4.13, Condition B, Required Action B.2 is in progress. The cause and resolution are under evaluation.

A spokeswoman for the plant operated by a subsidiary of FirstEnergy Corp. says they don’t know how much coolant spilled out, but it was contained by its collection system.

Source: The Dispatch

Source: NRC Event Notifications

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