Event Notification Report for May 07, 2001
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/06/2001 - 05/07/2001
EVENT NUMBERS
37969
Power Reactor
Event Number: 37969
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: STEPHEN BAKER
HQ OPS Officer: DOUG WEAVER
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: STEPHEN BAKER
HQ OPS Officer: DOUG WEAVER
Notification Date: 05/07/2001
Notification Time: 15:23 [ET]
Event Date: 05/07/2001
Event Time: 14:43 [EDT]
Last Update Date: 05/07/2001
Notification Time: 15:23 [ET]
Event Date: 05/07/2001
Event Time: 14:43 [EDT]
Last Update Date: 05/07/2001
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):
WILLIAM COOK (R1)
WILLIAM COOK (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 97 | Power Operation | 0 | Hot Standby |
MANUAL REACTOR TRIP - LOSS OF CIRCULATING WATER PUMP
Operators manually inserted a reactor trip when a circulating water pump tripped. The "A" pump was out for maintenance with divers in the water bay. As a precaution for the safety of the divers, the travelling screens on the "B" water bay were stopped and tagged. Kelp started building up on the "B" traveling screens and the licensee pulled the divers from the water and restarted the "B" screens. As the screens started to move an increase in pressure across the screens and led to the pump trip.
The plant response to the trip was normal all control rods fully inserted. The plant is stable in mode three. Reactor coolant pumps are running and decay is being removed by dumping steam to the main condenser (two circulating water pumps are still running).
The licensee notified the NRC resident inspector, the State DEP and the town of Waterford. A press release is planned.
Operators manually inserted a reactor trip when a circulating water pump tripped. The "A" pump was out for maintenance with divers in the water bay. As a precaution for the safety of the divers, the travelling screens on the "B" water bay were stopped and tagged. Kelp started building up on the "B" traveling screens and the licensee pulled the divers from the water and restarted the "B" screens. As the screens started to move an increase in pressure across the screens and led to the pump trip.
The plant response to the trip was normal all control rods fully inserted. The plant is stable in mode three. Reactor coolant pumps are running and decay is being removed by dumping steam to the main condenser (two circulating water pumps are still running).
The licensee notified the NRC resident inspector, the State DEP and the town of Waterford. A press release is planned.