Event Notification Report for December 29, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/28/2002 - 12/29/2002
EVENT NUMBERS
39476
Power Reactor
Event Number: 39476
Facility: FERMI
Region: 3 State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: KEVIN DAHM
HQ OPS Officer: RICH LAURA
Region: 3 State: MI
Unit: [2] [] []
RX Type: [2] GE-4
NRC Notified By: KEVIN DAHM
HQ OPS Officer: RICH LAURA
Notification Date: 12/29/2002
Notification Time: 02:56 [ET]
Event Date: 12/29/2002
Event Time: 00:10 [EST]
Last Update Date: 12/29/2002
Notification Time: 02:56 [ET]
Event Date: 12/29/2002
Event Time: 00:10 [EST]
Last Update Date: 12/29/2002
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
ANNE MARIE STONE (R3)
ANNE MARIE STONE (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 75 | Power Operation | 0 | Hot Shutdown |
MANUAL SCRAM AT FERMI 2 DUE TO INABILITY TO DRIVE CONTROL RODS
"The reactor was being shut down from 100% due to a low output voltage condition from Master Power Unit
(MPU) 3. Power was lowered using core flow to 75%. The low MPU 3 voltage allowed selection of control rods
but would not allow control rods to be inserted. On Sunday, December 29, 2002 at 0010 hours, the reactor [was manually] scrammed from 75% power.
"Reactor level is stable in the normal band (197 inches). Reactor Level 3 (173 inches) was reached and level was restored to normal.
"No ECCS systems actuated. No safety/relief valves opened. All systems functioned normally. Reactor level is being maintained using feed water through the startup level control valve. Cool down is through the main turbine bypass valves to the main condenser. The following Level 3 isolations occurred as expected:
Group 4 - RHR Shutdown Cooling and Head Spray
Group 13 - Drywell Sumps
Group 15 - Traversing Incore Probe Systems
"NRC Senior Resident Inspector has been notified.
"This report is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), Any event that results in actuation of the reactor protection system (RPS) when the reactor is critical."
The licensee also indicated that all control rods properly scrammed into the core.
"The reactor was being shut down from 100% due to a low output voltage condition from Master Power Unit
(MPU) 3. Power was lowered using core flow to 75%. The low MPU 3 voltage allowed selection of control rods
but would not allow control rods to be inserted. On Sunday, December 29, 2002 at 0010 hours, the reactor [was manually] scrammed from 75% power.
"Reactor level is stable in the normal band (197 inches). Reactor Level 3 (173 inches) was reached and level was restored to normal.
"No ECCS systems actuated. No safety/relief valves opened. All systems functioned normally. Reactor level is being maintained using feed water through the startup level control valve. Cool down is through the main turbine bypass valves to the main condenser. The following Level 3 isolations occurred as expected:
Group 4 - RHR Shutdown Cooling and Head Spray
Group 13 - Drywell Sumps
Group 15 - Traversing Incore Probe Systems
"NRC Senior Resident Inspector has been notified.
"This report is being made in accordance with 10 CFR 50.72(b)(2)(iv)(B), Any event that results in actuation of the reactor protection system (RPS) when the reactor is critical."
The licensee also indicated that all control rods properly scrammed into the core.