United States Nuclear Regulatory Commission - Protecting People and the Environment
Home > NRC Library > Document Collections > Reports Associated with Events > Event Notification Reports > 2006 > May 18

Event Notification Report for May 18, 2006

U.S. Nuclear Regulatory Commission
Operations Center

Event Reports For
05/17/2006 - 05/18/2006

** EVENT NUMBERS **


42510 42582

To top of page
!!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor Event Number: 42510
Facility: WOLF CREEK
Region: 4 State: KS
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP
NRC Notified By: JAMES M. KURAS
HQ OPS Officer: JOHN MacKINNON
Notification Date: 04/19/2006
Notification Time: 11:13 [ET]
Event Date: 04/19/2006
Event Time: 09:00 [CDT]
Last Update Date: 05/17/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
KRISS KENNEDY (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

NON-CONSERVATIVE COLD OVERPRESSURE LIMIT CURVES DISCOVERED DURING ENGINEERING REVIEW

"Cold overpressure limit curve utilized in the EMG (Emergency Guidelines) network including EMG F-0, Critical Safety Function Status Trees is incorrect and non-conservative. This could have resulted in some instances where the operator may have diagnosed a green path (no challenge) when a yellow (potential challenge) or orange path (severe challenge) actually existed. The consequence would have been failure to implement the correct functional restoration procedure."

This problem was found during an Engineering review. The problem had existed since 1999.

The NRC Resident Inspector was notified of this event by the licensee.


* * * RETRACTION AT 1308 EDT ON 5/17/2006 FROM Lance Lane TO Steve Sandin * * *

"The purpose of this notification is to retract a previous report made on 4/19/06 at 1113 hours (EN# 42510). Further evaluation revealed that a green path would not have been diagnosed instead of an orange path. The evaluation also concluded that this condition does not prevent the fulfillment of a safety function."

The licensee informed the NRC Resident Inspector. Notified R4DO (Jones).

To top of page
Power Reactor Event Number: 42582
Facility: CALLAWAY
Region: 4 State: MO
Unit: [1] [ ] [ ]
RX Type: [1] W-4-LP
NRC Notified By: STEVE KOCHERT
HQ OPS Officer: STEVE SANDIN
Notification Date: 05/17/2006
Notification Time: 16:45 [ET]
Event Date: 05/17/2006
Event Time: 15:03 [CDT]
Last Update Date: 05/17/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
Person (Organization):
WILLIAM JONES (R4)

Unit SCRAM Code RX CRIT Initial PWR Initial RX Mode Current PWR Current RX Mode
1 N Y 90 Power Operation 70 Power Operation

Event Text

NEWS RELEASE AND NOTIFICATION TO OTHER GOVERNMENT AGENCIES - PLANNED PLANT SHUTDOWN

"This 4-hour phone call is being made to the NRC per 10CFR50.72(b)(2)(xi), news release or notification to other government agencies. This call is to inform the NRC that a Notification was made to the Missouri Public Service Commission (MPSC) at 1503 on 5/17/2006, and a press release reporting that the Callaway Plant is shutting down on May 17, 2006, for an outage expected to last longer than 72 hours. The below information was presented to the MPSC.

"The following is a report to the Missouri Public Service Commission (MPSC), to notify the MPSC of a forced outage at the Callaway Nuclear Plant. This notification is reportable under 4CSR240-3.1903(3)(B) because the outage is expected to last longer than 72 hours.

"At 1130, May 17, 2006, the Callaway Plant started shutting down to determine the cause of a valve problem in the non-nuclear part of the plant that is preventing the plant from operating at full power.

"The NRC Senior Resident Inspector has been notified."

Page Last Reviewed/Updated Friday, March 30, 2012
Friday, March 30, 2012