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Nuclear Event – Plant Shutdown: St. Lucie Nuclear Generating Station, Florida

2016/08/02

North America – USA | State of Florida, St. Lucie Nuclear Generating Station,
Location: 27°20’55.0″N 80°14’47.0″W
Present Operational Age: ~33 years
Event: PLANT S/D REQD BY TS

Nuclear Event in USA on Monday, 1 August, 2016 at 03:42 [EDT].

PLANT SHUTDOWN DUE TO PRESSURE BOUNDARY LEAKAGE GREATER THAN ALLOWABLE LIMIT

“On August 1, 2016 at 0342 EDT St. Lucie Unit 1 commenced a unit shutdown required by Technical Specifications due to Reactor Coolant System Pressure Boundary Leakage in excess of the allowable limit of zero leakage. The leak was initially identified on July 31, 2016 at 2115 EDT as not Pressure Boundary leakage. After further analysis, the leak was determined to be Reactor Coolant System Pressure Boundary leakage at 0123 on August 1, 2016. The leakage is estimated as less than one tenth of a gallon per minute and is not impacting the ability to shut down the unit. Additional impact of the leak is under evaluation.

“This report is submitted in accordance with 10CFR50.72(b)(2)(i) as ‘The initiation of any nuclear plant shutdown required by the plant’s Technical Specifications.’

“The location of the leak is on the Instrumentation piping welded connection at Flow Element FE-3311 attached to [the] Emergency Core Cooling System Injection header to Reactor Coolant System Loop 1A2. The leak activity is 0.167 microCuries per ml.”

The NRC Resident Inspector has been notified.

Source: NRC  Event Number: 52138

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