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Nuclear Event – Degraded Condition: Point Beach Nuclear Plant, Unit 1, Wisconsin

2016/03/16

Point Beach Nuclear Plant or the Kewaunee Power Station

Point Beach Nuclear Plant a.k.a. the Kewaunee Power Station. Image: Shawano County UW-Extension

North America – USA | State of Wisconsin, Two Rivers, Point Beach Nuclear Plant, Unit 1
Location: 44°16’52.0″N 87°32’12.0″W
Present Operational Age: ~46 years
Event:  DEGRADED CONDITION

IDENTIFIED PRESSURE BOUNDARY LEAKAGE

“During a scheduled refueling outage, an inspection of containment components revealed a suspected through wall leak on 1CV-200B, Letdown Orifice ‘B’ Outlet Control. Non-destructive engineering inspection has been completed and determined that an indication exists.

“10 CFR 50.2(2)(i) defines the reactor coolant pressure boundary as being connected to the reactor coolant system, up to and including the outermost containment isolation valve in system piping which penetrates primary reactor containment. 1CV-200B is isolable from the Reactor Coolant System (RCS) by a single motor operated valve, 1RC-427, Reactor Coolant Loop ‘B’ Leg to CVCS Letdown Isolation valve.

1CV-200B is located inside of containment between 1RC-427 and the two containment isolation valves for the letdown line, 1CV-371 and 1CV-371A. Based on the definition provided in 10 CFR 50.2, the condition is considered pressure boundary leakage and is considered reportable under 10 CFR 50.72(b)(3)(ii).

Unit 1 is currently in Mode 6. Repairs for the condition are being determined.

The NRC Resident Inspector has been notified.

Source: NRC  Event Number: 51792


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