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Event Notification Report for April 15, 2008

U.S. Nuclear Regulatory Commission Operations Center Event Reports For 04/14/2008 - 04/15/2008 ** EVENT NUMBERS ** 44138 Power Reactor Event Number: 44138 Facility: FT CALHOUN Region: 4 State: NE Unit: [1] [ ] [ ] RX Type: [1] CE NRC Notified By: ERICK MATZKE HQ OPS Officer: JOE O'HARA Notification Date: 04/14/2008 Notification Time: 16:05 [ET] Event Date: 04/14/2008 Event Time: 12:45 [CDT] Last Update Date: 04/14/2008 Emergency Class: NON EMERGENCY 10 CFR Section: 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION Person (Organization): JEFFREY CLARK (R4) Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode 1 N Y 100 Power Operation 100 Power Operation Event Text HIGH ENERGY LINE BREAK ANALYSIS REVEALED POTENTIAL ACCIDENT MITIGATION DEFICIENCY "During review of a High Energy Line Break (HELB) analysis a condition was discovered where a break in the auxiliary steam system could result in a loss of all the containment fans and coolers, which are required to be maintained operable due to procedural restrictions to mitigate a design basis accident. "The plant entered Technical Specification (T.S.) 2.0.1 at 1245 CDT. This specification requires a plant shutdown within 6 hours. Operations personnel isolated auxiliary steam to the affected areas of the Auxiliary Building at 1305 CDT. With auxiliary steam isolated to the Auxiliary Building, containment fans and associated coolers were restored to an operable status. Plant exited T.S. 2.0.1 at 1305 CDT." The licensee notified the NRC Resident Inspector.

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