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Event Notification Report for January 5, 2006

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
01/04/2006 - 01/05/2006

** EVENT NUMBERS **


42241 42242

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Power Reactor Event Number: 42241
Facility: DUANE ARNOLD
Region: 3 State: IA
Unit: [1] [ ] [ ]
RX Type: [1] GE-4
NRC Notified By: HANS OLSON
HQ OPS Officer: BILL HUFFMAN
Notification Date: 01/04/2006
Notification Time: 15:15 [ET]
Event Date: 01/04/2006
Event Time: 11:00 [CST]
Last Update Date: 01/04/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
CHRISTINE LIPA (R3)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 96 Power Operation 96 Power Operation

Event Text

PARTIAL LOSS OF EMERGENCY SIRENS

"On 01/04/06, while performing the Emergency Siren Monthly Test it was determined that 14 out of 143 (9.7%) of the Emergency sirens had failed. A Notification is required because of the major loss of offsite response capability, i.e., the public prompt notification system.

"Calculating the percentage of failures with a total count of 143 sirens results in an approximately 10% failure rate or a 'significant number of failures.'

"This information was immediately discussed with Licensing and determined that a conservative decision is to make an 10 CFR 50.72(b)(3)(xiii) reportability notification. The State of Iowa, FEMA, and Benton and Linn Counties have also been notified.

"Electricians were immediately dispatched to begin to troubleshoot and repair the 14 declared INOP sirens.

"Compensatory actions have been taken."

The licensee notified the NRC Resident Inspector.

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Power Reactor Event Number: 42242
Facility: CALLAWAY
Region: 4 State: MO
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP
NRC Notified By: KEITH DUNCAN
HQ OPS Officer: BILL HUFFMAN
Notification Date: 01/04/2006
Notification Time: 18:29 [ET]
Event Date: 01/04/2006
Event Time: 13:45 [CST]
Last Update Date: 01/04/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
MICHAEL SHANNON (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

UNANALYZED CONDITION RELATED TO EMERGENCY DIESEL FUEL OIL TANK VORTEX FORMATION

"At 1345, 1/4/06, Callaway Nuclear Plant completed a preliminary evaluation of the potential for vortex formation at the suction of the Emergency Diesel Generator fuel oil transfer pumps. This evaluation was performed in response to industry operating experience concerning an NRC finding identified during a utility inspection. The preliminary conclusion was that the existing Technical Specification level requirements for the Emergency Diesel Generator underground fuel oil storage tanks may be non-conservative and should be increased by an additional 489 gallons. This will result in a six day fuel oil volume requirement of 69,746 gallons and a seven day fuel oil volume requirement of 80,816 gallons.

"A review of indicated fuel oil storage tank levels for the last three years was conducted and it was determined that there was sufficient fuel oil contained within the underground storage tanks to satisfy the new, higher volume requirements. In those instances where the volume would have been below the new requirements, this condition was already being tracked in the Callaway Plant Equipment Out of Service Log (EOSL) to satisfy associated Technical Specification requirements.

"It was conservatively decided to institute administrative controls utilizing plant procedural controls and establish new, elevated fuel oil tank level limits which will ensure vortex formation can not occur. Once the evaluation results are finalized, a review of all actions taken to date will be performed to ensure all required actions have been identified and appropriate measures taken to ensure compliance."

The licensee notified the NRC Resident Inspector.

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Friday, March 30, 2012