U.S. Nuclear Regulatory Commission Operations Center Event Reports For 05/17/2006 - 05/18/2006 ** EVENT NUMBERS ** | !!!!! THIS EVENT HAS BEEN RETRACTED. THIS EVENT HAS BEEN RETRACTED !!!!!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). | 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." | |