Event Notification Report for March 26, 2006
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/25/2006 - 03/26/2006
EVENT NUMBERS
42595
Power Reactor
Event Number: 42595
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: PATRICK RYAN
HQ OPS Officer: JOHN KNOKE
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: PATRICK RYAN
HQ OPS Officer: JOHN KNOKE
Notification Date: 05/22/2006
Notification Time: 13:11 [ET]
Event Date: 03/26/2006
Event Time: 03:47 [CDT]
Last Update Date: 05/22/2006
Notification Time: 13:11 [ET]
Event Date: 03/26/2006
Event Time: 03:47 [CDT]
Last Update Date: 05/22/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
10 CFR Section:
50.73(a)(1) - INVALID SPECIF SYSTEM ACTUATION
Person (Organization):
MARK RING (R3)
BRUCE BURGESS EMAIL (R3)
MARK RING (R3)
BRUCE BURGESS EMAIL (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 80 | Power Operation | 80 | Power Operation |
60 DAY NOTIFICATION - INVALID ACTUATION OF HIGH PRESSURE CORE SPRAY PUMP
"The following 60-day report is being made under 50.73 (a)(2)(iv)(A) for an invalid actuation of the High Pressure Cory Spray pump that occurred at 0347 hours on March 26, 2006. As allowed by 10CFR50.73(a)(1) this notification is being made via telephone. NUREG-1022, Revision 2 identifies the information that needs to be reported as follows:
"(a) The specific train(s) and system(s) that were actuated.
"On March 26, 2006 at 0347, the Division 4 Nuclear System Protection System (NSPS) power was lost due to a loss of the Division 4 NSPS inverter. The High Pressure Core Spray (HPCS) pump started automatically as a result of this failure. This response is identified in the Operations bus outage procedure as a potential impact of the loss of Division 4 NSPS and was considered expected. Immediate actions were taken to secure HPCS and declare it inoperable.
"An Apparent Cause Evaluation was performed. The apparent cause of the loss of Division 4 NSPS Inverter was determined to be the age related failure of the Z111 voltage regulator on the 12 Static Switch logic card.
"(b) Whether each train actuation was complete or partial.
"The automatic start of High Pressure Core Spray was partial since the 1E22-F004 HPCS Injection Valve does not receive an open permissive when the Division 4 NSPS Inverter is deenergized.
"(c) Whether or not the system started and functioned successfully.
"The start of High Pressure Core Spray pump was successful and functioned properly in the minimum recirculation flow mode."
The licensee notified the NRC Resident Inspector.
"The following 60-day report is being made under 50.73 (a)(2)(iv)(A) for an invalid actuation of the High Pressure Cory Spray pump that occurred at 0347 hours on March 26, 2006. As allowed by 10CFR50.73(a)(1) this notification is being made via telephone. NUREG-1022, Revision 2 identifies the information that needs to be reported as follows:
"(a) The specific train(s) and system(s) that were actuated.
"On March 26, 2006 at 0347, the Division 4 Nuclear System Protection System (NSPS) power was lost due to a loss of the Division 4 NSPS inverter. The High Pressure Core Spray (HPCS) pump started automatically as a result of this failure. This response is identified in the Operations bus outage procedure as a potential impact of the loss of Division 4 NSPS and was considered expected. Immediate actions were taken to secure HPCS and declare it inoperable.
"An Apparent Cause Evaluation was performed. The apparent cause of the loss of Division 4 NSPS Inverter was determined to be the age related failure of the Z111 voltage regulator on the 12 Static Switch logic card.
"(b) Whether each train actuation was complete or partial.
"The automatic start of High Pressure Core Spray was partial since the 1E22-F004 HPCS Injection Valve does not receive an open permissive when the Division 4 NSPS Inverter is deenergized.
"(c) Whether or not the system started and functioned successfully.
"The start of High Pressure Core Spray pump was successful and functioned properly in the minimum recirculation flow mode."
The licensee notified the NRC Resident Inspector.