Event Notification Report for March 16, 2008
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/15/2008 - 03/16/2008
Power Reactor
Event Number: 44067
Facility: COMANCHE PEAK
Region: 4 State: TX
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: PAT MINAHAN
HQ OPS Officer: JOHN KNOKE
Region: 4 State: TX
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: PAT MINAHAN
HQ OPS Officer: JOHN KNOKE
Notification Date: 03/16/2008
Notification Time: 14:12 [ET]
Event Date: 03/16/2008
Event Time: 11:37 [CDT]
Last Update Date: 03/16/2008
Notification Time: 14:12 [ET]
Event Date: 03/16/2008
Event Time: 11:37 [CDT]
Last Update Date: 03/16/2008
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):
TROY PRUETT (R4)
TROY PRUETT (R4)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
REACTOR TRIP DUE TO BROKEN SENSING LINE
"At 1137 CDT, Comanche Peak NPP, Unit 2 reactor tripped due to a broken sensing line feeding the vacuum inputs to the 2/3 low vacuum turbine trip. With the reactor power steady at 100%, the turbine trip signal generated a valid RPS reactor trip signal. All control rods fully inserted. Both motor driven AFW pumps and the turbine driven AFW pump started as a result of low steam generator level following the trip.
"Currently Unit 2 is in Mode 3, stable with RCS temperature at no-load program temperature of 557 degree F being maintained on the steam dumps. All 4 steam generators are at program level, being maintained by the motor driven AFW pumps. The turbine driven AFW pump has been returned to standby."
The licensee notified the NRC Resident Inspector.
"At 1137 CDT, Comanche Peak NPP, Unit 2 reactor tripped due to a broken sensing line feeding the vacuum inputs to the 2/3 low vacuum turbine trip. With the reactor power steady at 100%, the turbine trip signal generated a valid RPS reactor trip signal. All control rods fully inserted. Both motor driven AFW pumps and the turbine driven AFW pump started as a result of low steam generator level following the trip.
"Currently Unit 2 is in Mode 3, stable with RCS temperature at no-load program temperature of 557 degree F being maintained on the steam dumps. All 4 steam generators are at program level, being maintained by the motor driven AFW pumps. The turbine driven AFW pump has been returned to standby."
The licensee notified the NRC Resident Inspector.
Power Reactor
Event Number: 44068
Facility: TURKEY POINT
Region: 2 State: FL
Unit: [] [4] []
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: GRANT MELIN
HQ OPS Officer: JOHN KNOKE
Region: 2 State: FL
Unit: [] [4] []
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: GRANT MELIN
HQ OPS Officer: JOHN KNOKE
Notification Date: 03/16/2008
Notification Time: 16:52 [ET]
Event Date: 03/16/2008
Event Time: 14:30 [EDT]
Last Update Date: 11/14/2008
Notification Time: 16:52 [ET]
Event Date: 03/16/2008
Event Time: 14:30 [EDT]
Last Update Date: 11/14/2008
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
MARK LESSER (R2)
MARK LESSER (R2)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 4 | N | Y | 100 | Power Operation | 100 | Power Operation |
LOSS OF PLANT PROCESS COMPUTER SYSTEM ERDADS
"The Plant Process Computer System (Emergency Response and Data Acquisition System, 'ERDADS') OPCONs for Unit 4 failed causing the NRC Emergency Response Data System Link to be non-functional.
"This is an eight hour NRC Notification for an ERDADS failure which is not corrected in 30 minutes and a loss of ability to supply ERDS data for greater than 30 minutes per 1OCFR 50.72(b)(3)(xiii)."
The licensee notified the NRC Resident Inspector.
* * * UPDATE ON 4/12/2008 AT 1512 FROM JIM RUSSELL TO MARK ABRAMOVITZ * * *
"The Unit 4 Plant process Computer System (Emergency Response and Data Acquisition System, 'ERDADS') is out of service for an approximate 4 week period to implement a planned modification which replaces the current ERDADS system. During this time period the Unit 4 ERDS and SPDS functions will not be available. Also, Unit 4 Regulatory Guide 1.97 Category 2D Containment Temperature and power system indicators for motor control centers, batteries and inverters is unavailable in the Control Room, although other instrumentation is available to monitor these parameters."
The reactor is currently defueled.
Notified the R2DO (Musser).
The licensee notified the NRC Resident Inspector.
* * * UPDATE ON 11/14/2008 AT 1155 FROM BOB BONONTO TO MARK ABRAMOVITZ * * *
ERDS was returned to service on October 31, 2008.
The licensee notified the NRC Resident Inspector.
Notified the R2DO (Bonser).
"The Plant Process Computer System (Emergency Response and Data Acquisition System, 'ERDADS') OPCONs for Unit 4 failed causing the NRC Emergency Response Data System Link to be non-functional.
"This is an eight hour NRC Notification for an ERDADS failure which is not corrected in 30 minutes and a loss of ability to supply ERDS data for greater than 30 minutes per 1OCFR 50.72(b)(3)(xiii)."
The licensee notified the NRC Resident Inspector.
* * * UPDATE ON 4/12/2008 AT 1512 FROM JIM RUSSELL TO MARK ABRAMOVITZ * * *
"The Unit 4 Plant process Computer System (Emergency Response and Data Acquisition System, 'ERDADS') is out of service for an approximate 4 week period to implement a planned modification which replaces the current ERDADS system. During this time period the Unit 4 ERDS and SPDS functions will not be available. Also, Unit 4 Regulatory Guide 1.97 Category 2D Containment Temperature and power system indicators for motor control centers, batteries and inverters is unavailable in the Control Room, although other instrumentation is available to monitor these parameters."
The reactor is currently defueled.
Notified the R2DO (Musser).
The licensee notified the NRC Resident Inspector.
* * * UPDATE ON 11/14/2008 AT 1155 FROM BOB BONONTO TO MARK ABRAMOVITZ * * *
ERDS was returned to service on October 31, 2008.
The licensee notified the NRC Resident Inspector.
Notified the R2DO (Bonser).