| U.S. Nuclear Regulatory Commission
Operations Center Event Reports For
02/07/2007 - 02/08/2007 ** EVENT NUMBERS ** |
 | Power Reactor | Event Number: 43151 | Facility: COOPER
Region: 4 State: NE
Unit: [1] [ ] [ ]
RX Type: [1] GE-4
NRC Notified By: JOHN MEYERS
HQ OPS Officer: JASON KOZAL | Notification Date: 02/07/2007
Notification Time: 11:10 [ET]
Event Date: 02/07/2007
Event Time: 04:30 [CST]
Last Update Date: 02/07/2007 | Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
| Person (Organization):
REBECCA NEASE (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 PRESSURE COOLANT INJECTION SYSTEM INOPERABLE
"Between 0430 and 0457 on 2-7-2007, the alarm for 'HPCI Inverter Circuit Failure' was received three times. Indications on High Pressure Coolant Injection (HPCI) pressure instruments and the HPCI Flow Controller also showed oscillations. The power indicating light on the HPCI inverter was also observed to extinguish and re-illuminate once. Because of the alarms and changes in indications, the capability of the inverter is questionable, and HPCI may not be capable of performing its required functions.
"HPCI was declared inoperable as of 0430, resulting in entry into Tech Spec LCO 3.5.1 Condition C - HPCI System Inoperable and 3.5.1 Condition D - HPCI System Inoperable and Condition A entered. At the time HPCI was declared inoperable, Core Spray Loop A was also Inoperable for planned maintenance, day 2 of a 7 day LCO. Required Actions for Condition D are to restore either HPCI or the low pressure ECCS injection/spray system to operable status within 72 hours.
"Troubleshooting activities for HPCI are being planned, and maintenance and testing activities for Core Spray A are continuing. Completion of the maintenance window for Core Spray A is scheduled for later this afternoon, and activities for Core Spray are currently on schedule.
"HPCI is a single train system. This report is submitted as a condition that at time of discovery could prevent the fulfillment of the safety function of an SSC needed to mitigate the consequence of an accident."
The licensee notified the NRC Resident Inspector. |
| Power Reactor | Event Number: 43152 | Facility: HATCH
Region: 2 State: GA
Unit: [1] [ ] [ ]
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: FRANK GORLEY
HQ OPS Officer: JOHN MacKINNON | Notification Date: 02/07/2007
Notification Time: 18:29 [ET]
Event Date: 02/07/2007
Event Time: 16:40 [EST]
Last Update Date: 02/07/2007 | Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
| Person (Organization):
CAROLYN EVANS (R2)
|
| 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 PRESSURE COOLENT INJECTION (HPCI) DECLARED INOPERABLE
"The HPCI minimum flow valve was found to have no position indication. The valve was verified to be in the closed position. Maintenance subsequent investigation found the control power fuse to be blown in the breaker, rendering it inoperable to stroke on low flow as designed. HPCI then declared inoperable." The fuse has been replaced and they position indication for HPCI minimum flow valve.
Licensee entered Technical Specification 3.5.1 (14 day limiting condition of operation). All other Emergency Core Cooling Systems and the Emergency Diesel Generators are fully operable.
The NRC Resident Inspector was notified of this event by the licensee. | |