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Nuclear Event – Plant Shutdown, (RCS) leak detection: Wolf Creek Generating Station, Unit 1, Kansas


North America – USA | State of Kansas, Burlington, Wolf Creek Nuclear Generating Station
Location:  38°14’20.0″N 95°41’20.0″W
Present Operational Age: ~31 years

Nuclear Event in USA on Friday, 02 September, 2016 at 08:08 [CDT]


“While operating in MODE 1 at 100 percent rated thermal power and placing Excess Letdown in service for Reactor Coolant System (RCS) leak detection, RCS operational leakage exceeded 1 gpm [gallon per minute] unidentified leakage as identified by performing RCS Water Inventory Balance using the Nuclear Plant Information System Computer. This required the entry into Technical Specification (TS) Limiting Condition of Operation (LCO) 3.4.13 Condition B at 0808 [CDT] on 9/2/16. The associated action is to place the unit into Mode 3 in 6 hours. Trending of containment sump level indicates the leakage is inside containment with the exact location within containment unknown. Containment inspection is being performed to try and identify the source of Reactor Coolant System leakage. NRC Resident Inspector has been notified. Re-alignment of the Letdown System back to its normal arrangement has subsequently reduced RCS leak rate to 0.521 gpm at 0652 CDT on 9/2/16.

“Unusual or Not Understood – Leak Location is not known at this time.”

Maximum leak rate recorded was 1.358 gpm. The leak was first discovered at 08/31/16 at 1519 CDT.
Safety Related Equipment not operational – Reactor Vessel Level Indicating System (TS 3.3.3).

Source: NRC Event Number: 52218

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