Event Notification Report for August 22, 2001
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/21/2001 - 08/22/2001
EVENT NUMBERS
38225
Power Reactor
Event Number: 38225
Facility: NINE MILE POINT
Region: 1 State: NY
Unit: [1] [] []
RX Type: [1] GE-2,[2] GE-5
NRC Notified By: JOHN KRAKUSZESKI
HQ OPS Officer: FANGIE JONES
Region: 1 State: NY
Unit: [1] [] []
RX Type: [1] GE-2,[2] GE-5
NRC Notified By: JOHN KRAKUSZESKI
HQ OPS Officer: FANGIE JONES
Notification Date: 08/22/2001
Notification Time: 08:07 [ET]
Event Date: 08/22/2001
Event Time: 05:08 [EDT]
Last Update Date: 08/22/2001
Notification Time: 08:07 [ET]
Event Date: 08/22/2001
Event Time: 05:08 [EDT]
Last Update Date: 08/22/2001
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):
JAMES NOGGLE (R1)
JAMES NOGGLE (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 100 | Power Operation | 0 | Hot Shutdown |
AUTOMATIC REACTOR SCRAM ON TURBINE TRIP DUE TO A LOAD REJECT
"In accordance with 10 CFR 50.72 b (2) iv (B) a RPS actuation occurred following a generator load reject. Reactor Scram occurred at 0508 August 22, 2001 due to a turbine trip signal generated from the load reject. All six ERVs opened to control reactor pressure due to the initial load reject. A negative phase sequence was experience on 345 kV lines resulting in a trip of generator 86 G1& G2 relays. All control rods fully inserted following the automatic reactor scram.
"Also, in accordance with 10 CFR 50.72 b (3) iv (A) an MSIV isolation was experienced when reactor pressure reached 850 psig with the mode switch in RUN as expected. The operator was in the process of taking the mode switch to SHUTDOWN but before this action was complete the MSIV isolation signal was generated as pressure dropped below 850 psig. High Pressure Coolant Injection initiated due to vessel level <53 inches as expected. Vessel level dropped to approximately 43 inches. Following the MSIV isolation level increased to the high-level trip setpoint as expected and was returned to the normal band. MSIVs were reopened for pressure control and a feedwater pump was restarted to augment vessel level control.
"SOPs and EOPs were entered to stabilize the plant and control reactor pressure and level in normal bands. Cooldown to cold shutdown is in progress. Current reactor temperature is 439 degrees F with reactor pressure 361 psig.
"All containment parameters are normal and offsite power is available. No maintenance or surveillance activities were occurring at the time of the Reactor Scram."
The licensee notified the NRC Resident Inspector.
"In accordance with 10 CFR 50.72 b (2) iv (B) a RPS actuation occurred following a generator load reject. Reactor Scram occurred at 0508 August 22, 2001 due to a turbine trip signal generated from the load reject. All six ERVs opened to control reactor pressure due to the initial load reject. A negative phase sequence was experience on 345 kV lines resulting in a trip of generator 86 G1& G2 relays. All control rods fully inserted following the automatic reactor scram.
"Also, in accordance with 10 CFR 50.72 b (3) iv (A) an MSIV isolation was experienced when reactor pressure reached 850 psig with the mode switch in RUN as expected. The operator was in the process of taking the mode switch to SHUTDOWN but before this action was complete the MSIV isolation signal was generated as pressure dropped below 850 psig. High Pressure Coolant Injection initiated due to vessel level <53 inches as expected. Vessel level dropped to approximately 43 inches. Following the MSIV isolation level increased to the high-level trip setpoint as expected and was returned to the normal band. MSIVs were reopened for pressure control and a feedwater pump was restarted to augment vessel level control.
"SOPs and EOPs were entered to stabilize the plant and control reactor pressure and level in normal bands. Cooldown to cold shutdown is in progress. Current reactor temperature is 439 degrees F with reactor pressure 361 psig.
"All containment parameters are normal and offsite power is available. No maintenance or surveillance activities were occurring at the time of the Reactor Scram."
The licensee notified the NRC Resident Inspector.