Event Notification Report for May 06, 2001
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/05/2001 - 05/06/2001
EVENT NUMBERS
37968
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 37968
Facility: MONTICELLO
Region: 3 State: MN
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: SCHMIDT
HQ OPS Officer: CHAUNCEY GOULD
Region: 3 State: MN
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: SCHMIDT
HQ OPS Officer: CHAUNCEY GOULD
Notification Date: 05/06/2001
Notification Time: 06:02 [ET]
Event Date: 05/06/2001
Event Time: 03:10 [CDT]
Last Update Date: 05/15/2001
Notification Time: 06:02 [ET]
Event Date: 05/06/2001
Event Time: 03:10 [CDT]
Last Update Date: 05/15/2001
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD
10 CFR Section:
50.72(b)(3)(v)(A) - POT UNABLE TO SAFE SD
Person (Organization):
MELVYN LEACH (R3)
MELVYN LEACH (R3)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 90 | Power Operation | 73 | Power Operation |
MAIN TURBINE STOP VALVE FAILED TO CLOSE DURING TESTING
The #4 main turbine stop valve failed to close during the performance of turbine valve testing procedure. Failure of the turbine valve to close affects the turbine stop valve closure scram function of both A&B reactor protection trip systems. Reactor power is currently being reduced to less than 45% power which is required when the minimum conditions for the turbine stop valve closure scram function are not satisfied. The licensee believes the cause of the problem is probably due to a bad solenoid valve.
The NRC Resident Inspector will be notified.
**** RETRACTION RECEIVED AT 1641 EDT ON 05/15/01 FROM PATRICK DECKER TO LEIGH TROCINE ****
The licensee is retracting this event notification. The following text is a portion of a facsimile received from the licensee:
"[...] On [05/06/01], we reported the failure to close of Main Turbine Stop Valve #4 during routine testing. Subsequently, it was learned that the failure affected the test circuit only and had no effect on the normal operation of the stop valve. Therefore, this event is not reportable. The test circuit failure has been corrected, and the Main Turbine Stop Valve #4 retested successfully."
The licensee notified the NRC resident inspector. The NRC operations officer notified the R3DO (Parker).
The #4 main turbine stop valve failed to close during the performance of turbine valve testing procedure. Failure of the turbine valve to close affects the turbine stop valve closure scram function of both A&B reactor protection trip systems. Reactor power is currently being reduced to less than 45% power which is required when the minimum conditions for the turbine stop valve closure scram function are not satisfied. The licensee believes the cause of the problem is probably due to a bad solenoid valve.
The NRC Resident Inspector will be notified.
**** RETRACTION RECEIVED AT 1641 EDT ON 05/15/01 FROM PATRICK DECKER TO LEIGH TROCINE ****
The licensee is retracting this event notification. The following text is a portion of a facsimile received from the licensee:
"[...] On [05/06/01], we reported the failure to close of Main Turbine Stop Valve #4 during routine testing. Subsequently, it was learned that the failure affected the test circuit only and had no effect on the normal operation of the stop valve. Therefore, this event is not reportable. The test circuit failure has been corrected, and the Main Turbine Stop Valve #4 retested successfully."
The licensee notified the NRC resident inspector. The NRC operations officer notified the R3DO (Parker).