Event Notification Report for December 11, 2003
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/10/2003 - 12/11/2003
EVENT NUMBERS
40388
Power Reactor
Event Number: 40388
Facility: DRESDEN
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: DAVID CARLSON
HQ OPS Officer: JEFF ROTTON
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-1,[2] GE-3,[3] GE-3
NRC Notified By: DAVID CARLSON
HQ OPS Officer: JEFF ROTTON
Notification Date: 12/12/2003
Notification Time: 01:25 [ET]
Event Date: 12/11/2003
Event Time: 23:35 [CST]
Last Update Date: 12/12/2003
Notification Time: 01:25 [ET]
Event Date: 12/11/2003
Event Time: 23:35 [CST]
Last Update Date: 12/12/2003
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 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)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
MARK RING (R3)
MARK RING (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 96 | Power Operation | 0 | Hot Shutdown |
MANUAL SCRAM DUE TO UNEXPECTED STATOR WATER COOLING RUNBACK
Manual scram was inserted during a Stator Cooling Runback that was not expected. Cause of the Stator Cooling Runback is under investigation.
Group 2 & 3 Primary Containment Isolation System (PCIS) isolations occurred as expected due to reactor level drop during the scram. All other systems operated as expected.
All controls rods were fully inserted during the manual scram. The MSIVs are open with decay heat being removed via steam to the main condenser using the turbine bypass valves. The condensate and feedwater system is in operation maintaining reactor vessel water level. Current Reactor Pressure is 880 psig and Reactor Level +30 inches. The electrical plant lineup is stable and in a normal lineup for this condition. The manual scram of this unit had no affect on the other unit onsite which is in a refueling outage.
The licensee has notified the NRC Resident Inspector.
Manual scram was inserted during a Stator Cooling Runback that was not expected. Cause of the Stator Cooling Runback is under investigation.
Group 2 & 3 Primary Containment Isolation System (PCIS) isolations occurred as expected due to reactor level drop during the scram. All other systems operated as expected.
All controls rods were fully inserted during the manual scram. The MSIVs are open with decay heat being removed via steam to the main condenser using the turbine bypass valves. The condensate and feedwater system is in operation maintaining reactor vessel water level. Current Reactor Pressure is 880 psig and Reactor Level +30 inches. The electrical plant lineup is stable and in a normal lineup for this condition. The manual scram of this unit had no affect on the other unit onsite which is in a refueling outage.
The licensee has notified the NRC Resident Inspector.