Event Notification Report for April 21, 2008
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/20/2008 - 04/21/2008
EVENT NUMBERS
44153
Power Reactor
Event Number: 44153
Facility: INDIAN POINT
Region: 1 State: NY
Unit: [2] [] []
RX Type: [2] W-4-LP,[3] W-4-LP
NRC Notified By: NICK LIZZO
HQ OPS Officer: JASON KOZAL
Region: 1 State: NY
Unit: [2] [] []
RX Type: [2] W-4-LP,[3] W-4-LP
NRC Notified By: NICK LIZZO
HQ OPS Officer: JASON KOZAL
Notification Date: 04/21/2008
Notification Time: 14:24 [ET]
Event Date: 04/21/2008
Event Time: 11:25 [EDT]
Last Update Date: 04/21/2008
Notification Time: 14:24 [ET]
Event Date: 04/21/2008
Event Time: 11:25 [EDT]
Last Update Date: 04/21/2008
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):
JOHN WHITE (R1)
JOHN WHITE (R1)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 37 | Power Operation | 0 | Hot Standby |
MANUAL REACTOR TRIP DUE TO LOWERING STEAM GENERATOR WATER LEVEL
"On April 21 2008, at approximately 1123 hours, during power ascension from a scheduled refueling outage, Unit 2 experienced an inadvertent main turbine runback. The runback initiated for unknown reasons from an initial reactor power of approximately 37%. As a result of the runback, operators observed decreasing steam generator levels and initiated a manual reactor trip at 1125 hours. As a result of the reactor trip, the auxiliary feedwater pumps actuated on a low steam generator level as designed. Prior to the runback, one of two main feedwater pumps was operating. The unit is stable and in Mode 3. Operators closed the main steam isolation valves as a result of indications of lowering RCS temperature. A 4-hour non-emergency notification is provided for a reactor trip while critical and 8 hour non-emergency notification is provided for a valid actuation of the auxiliary feedwater system."
All rods inserted as expected. Decay heat is being removed by AFW through the atmospheric steam dumps. Offsite power is in a normal configuration.
The licensee notified the NRC Resident Inspector.
"On April 21 2008, at approximately 1123 hours, during power ascension from a scheduled refueling outage, Unit 2 experienced an inadvertent main turbine runback. The runback initiated for unknown reasons from an initial reactor power of approximately 37%. As a result of the runback, operators observed decreasing steam generator levels and initiated a manual reactor trip at 1125 hours. As a result of the reactor trip, the auxiliary feedwater pumps actuated on a low steam generator level as designed. Prior to the runback, one of two main feedwater pumps was operating. The unit is stable and in Mode 3. Operators closed the main steam isolation valves as a result of indications of lowering RCS temperature. A 4-hour non-emergency notification is provided for a reactor trip while critical and 8 hour non-emergency notification is provided for a valid actuation of the auxiliary feedwater system."
All rods inserted as expected. Decay heat is being removed by AFW through the atmospheric steam dumps. Offsite power is in a normal configuration.
The licensee notified the NRC Resident Inspector.