United States Nuclear Regulatory Commission - Protecting People and the Environment

Event Notification Report for January 5, 2011

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
01/04/2011 - 01/05/2011

** EVENT NUMBERS **


46520

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Power Reactor Event Number: 46520
Facility: COOK
Region: 3 State: MI
Unit: [1] [2] [ ]
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: BUD HINCKLEY
HQ OPS Officer: STEVE SANDIN
Notification Date: 01/04/2011
Notification Time: 08:15 [ET]
Event Date: 01/04/2011
Event Time: 08:00 [EST]
Last Update Date: 01/04/2011
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
CHRISTINE LIPA (R3DO)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 100 Power Operation 100 Power Operation
2 N Y 100 Power Operation 100 Power Operation

Event Text

UNAVAILABILITY OF TSC VENTILATION SYSTEM DUE TO SCHEDULED MAINTENANCE

"At 0800 EST on Tuesday, January 4, 2011, the Cook Nuclear Plant (CNP) Technical Support Center (TSC) air conditioning and charcoal filtration systems were removed from service for scheduled maintenance.

"Under certain accident conditions the TSC may become unavailable due to the inability of the air conditioning and charcoal filtration systems to maintain a habitable atmosphere. Compensatory measures exist to relocate TSC personnel to the unaffected unit's control room if necessary .

"TSC ventilation system maintenance is scheduled to be completed by 1600 EST on Tuesday, January 4, 2011.

"The licensee has notified the NRC Resident Inspector.

"This notification is being made in accordance with 10 CFR 50.72 (b)(3)(xiii) due to the loss of an emergency response facility,"


* * * UPDATE FROM BUD HINCKLEY TO DONALD NORWOOD AT 1709 EST ON 01/04/2011 * * *

"The TSC ventilation system maintenance was completed satisfactorily and the system was restored to service at 1705 EST."

The licensee will notify the NRC Resident Inspector.

Notified the R3DO (Lipa) via e-mail.

Page Last Reviewed/Updated Thursday, March 29, 2012
Thursday, March 29, 2012