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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 **

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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