Event Notification Report for November 25, 2006
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/24/2006 - 11/25/2006
EVENT NUMBERS
43011
Power Reactor
Event Number: 43011
Facility: SUSQUEHANNA
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: RICH KLINEFELTER
HQ OPS Officer: JOE O'HARA
Region: 1 State: PA
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: RICH KLINEFELTER
HQ OPS Officer: JOE O'HARA
Notification Date: 11/25/2006
Notification Time: 22:48 [ET]
Event Date: 11/25/2006
Event Time: 20:42 [EST]
Last Update Date: 11/25/2006
Notification Time: 22:48 [ET]
Event Date: 11/25/2006
Event Time: 20:42 [EST]
Last Update Date: 11/25/2006
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(xi) - OFFSITE NOTIFICATION 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(2)(xi) - OFFSITE NOTIFICATION 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
LAWRENCE DOERFLEIN (R1)
LAWRENCE DOERFLEIN (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 100 | Power Operation | 0 | Hot Shutdown |
REACTOR SCRAM FROM FULL POWER DUE TO GENERATOR LOAD REJECT
"At 2042 on 11/25/06, Susquehanna Unit 1 reactor automatically scrammed due to an apparent generator load reject. All rods fully inserted, and both reactor recirculation pumps tripped. Reactor water level lowered to approximately +13" inches causing level 3 (+13") isolations, and was restored to normal level (+35") by the feedwater system. All isolations at this level occurred as expected. Five steam safety relief valves opened then reclosed. Pressure was subsequently controlled via turbine bypass valve operation. All safety systems operated as expected.
"The 'A' reactor recirculation pump was restarted to re-establish forced core recirculation. Reactor water cleanup (RWCU) system has been restarted and placed in service. The reactor is currently stable in Mode 3. An investigation is underway.
"Unit Two continued power operation.
"The NRC resident inspector was notified. A press release will occur."
Decay heat is being removed by normal feedwater to the reactor vessel and steaming through the steam bypass valves to the condenser.
The licensee intends to notify the State of Pennsylvania EOC.
"At 2042 on 11/25/06, Susquehanna Unit 1 reactor automatically scrammed due to an apparent generator load reject. All rods fully inserted, and both reactor recirculation pumps tripped. Reactor water level lowered to approximately +13" inches causing level 3 (+13") isolations, and was restored to normal level (+35") by the feedwater system. All isolations at this level occurred as expected. Five steam safety relief valves opened then reclosed. Pressure was subsequently controlled via turbine bypass valve operation. All safety systems operated as expected.
"The 'A' reactor recirculation pump was restarted to re-establish forced core recirculation. Reactor water cleanup (RWCU) system has been restarted and placed in service. The reactor is currently stable in Mode 3. An investigation is underway.
"Unit Two continued power operation.
"The NRC resident inspector was notified. A press release will occur."
Decay heat is being removed by normal feedwater to the reactor vessel and steaming through the steam bypass valves to the condenser.
The licensee intends to notify the State of Pennsylvania EOC.