Event Notification Report for July 04, 2002
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/03/2002 - 07/04/2002
EVENT NUMBERS
39041
Power Reactor
Event Number: 39041
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: MERRIKEN
HQ OPS Officer: CHAUNCEY GOULD
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: MERRIKEN
HQ OPS Officer: CHAUNCEY GOULD
Notification Date: 07/04/2002
Notification Time: 05:57 [ET]
Event Date: 07/04/2002
Event Time: 01:33 [CDT]
Last Update Date: 07/04/2002
Notification Time: 05:57 [ET]
Event Date: 07/04/2002
Event Time: 01:33 [CDT]
Last Update Date: 07/04/2002
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):
PATRICK HILAND (R3)
PATRICK HILAND (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 95 | Power Operation | 0 | Hot Shutdown |
REACTOR SCRAM FROM 94.6% POWER DUE TO TURBINE TRIP CAUSED BY GENERATOR TRIP AND LOCKOUT
On July 4, 2002, at 0133, Clinton Power Station scrammed from 94.6% due to a Turbine Trip from a Generator Trip and Lockout. The initiating event for the scram is not presently known at this time but it is believed to be a problem with the Main Power Transformer (MPT) B. The Sudden Pressure MPT B alarm came simultaneously with the reactor scram. The Sudden Pressure MPT B alarm is brought in by the Sudden Pressure Fault Relay, which initiates a Main Generator trip and lockout, which trips the Main Turbine and initiates a reactor scram.
The MPT B deluge system initiated, however, there was no physical evidence of any damage to MPT B. After conducting a visual inspection of MPT B, the deluge system was secured. A clearance is being applied to MPT B for investigation.
The plant is presently in Mode 3, maintaining reactor pressure within a pressure band of 550 to 650 psig and level between Level 3 and Level 8, which is the normal level band.
The plant responded normally on the scram. All rods fully inserted, no ECCS injection occurred and no relief valves lifted.
The NRC Resident Inspector and the State were notified.
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On July 4, 2002, at 0133, Clinton Power Station scrammed from 94.6% due to a Turbine Trip from a Generator Trip and Lockout. The initiating event for the scram is not presently known at this time but it is believed to be a problem with the Main Power Transformer (MPT) B. The Sudden Pressure MPT B alarm came simultaneously with the reactor scram. The Sudden Pressure MPT B alarm is brought in by the Sudden Pressure Fault Relay, which initiates a Main Generator trip and lockout, which trips the Main Turbine and initiates a reactor scram.
The MPT B deluge system initiated, however, there was no physical evidence of any damage to MPT B. After conducting a visual inspection of MPT B, the deluge system was secured. A clearance is being applied to MPT B for investigation.
The plant is presently in Mode 3, maintaining reactor pressure within a pressure band of 550 to 650 psig and level between Level 3 and Level 8, which is the normal level band.
The plant responded normally on the scram. All rods fully inserted, no ECCS injection occurred and no relief valves lifted.
The NRC Resident Inspector and the State were notified.
-