Event Notification Report for April 25, 2013
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
04/24/2013 - 04/25/2013
Power Reactor
Event Number: 48968
Facility: FARLEY
Region: 2 State: AL
Unit: [] [2] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: JOSH CARROLL
HQ OPS Officer: BILL HUFFMAN
Region: 2 State: AL
Unit: [] [2] []
RX Type: [1] W-3-LP,[2] W-3-LP
NRC Notified By: JOSH CARROLL
HQ OPS Officer: BILL HUFFMAN
Notification Date: 04/25/2013
Notification Time: 20:51 [ET]
Event Date: 04/25/2013
Event Time: 17:59 [CDT]
Last Update Date: 04/29/2013
Notification Time: 20:51 [ET]
Event Date: 04/25/2013
Event Time: 17:59 [CDT]
Last Update Date: 04/29/2013
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):
MARVIN SYKES (R2DO)
MARVIN SYKES (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | N | 0 | Refueling | 0 | Refueling |
VENT STACK RADIATION MONITORS DE-ENERGIZED FOR SHORT DURATION DURING PRE-PLANNED MAINTENANCE
"This is a report of a loss of emergency assessment capability as required by 10 CFR 50.72(b)(3)(xiii).
"On April 25, 2013 at 1759 CDT, with Unit 2 in Mode 6 during a refueling outage, power was interrupted to all Unit 2 vent stack radiation monitors as part of a pre-planned activity to connect the radiation monitors to an alternate temporary power supply to support de-energizing the normal power source for preventative maintenance. The connection to the alternate supply was completed and power was restored to the vent stack radiation monitors at 1845 CDT. While the radiation monitors were without power, pre-planned compensatory measures were implemented to monitor vent stack discharge and to minimize activities that posed a potential for release.
"At the completion of the preventive maintenance on the normal power supply, power to the vent stack radiation monitors will again be briefly interrupted to reconnect the normal power source to the monitors. The pre-planned compensatory measures will again be utilized during this power interruption. An update to this report will be provided following the restoration of normal power to the radiation monitors.
"The NRC Resident inspector has been informed."
* * * UPDATE AT 0400 EDT ON 4/29/13 FROM BRANNON PAYNE TO S. SANDIN * * *
"On 28 April, 2013, power was again interrupted to the Unit 2 vent stack radiation monitors to restore the connection to their normal power supply. The radiation monitors were out of service from 2315 until 2340 CDT. Pre-planned compensatory measures were again implemented to monitor vent stack discharge and minimize potential for vent stack release.
"The reported time for the initial loss of vent stack radiation monitoring on April 25, 2013 was incorrect. The correct time was 1759 CDT.
"The NRC Resident has been notified."
Notified R2DO (Sykes).
"This is a report of a loss of emergency assessment capability as required by 10 CFR 50.72(b)(3)(xiii).
"On April 25, 2013 at 1759 CDT, with Unit 2 in Mode 6 during a refueling outage, power was interrupted to all Unit 2 vent stack radiation monitors as part of a pre-planned activity to connect the radiation monitors to an alternate temporary power supply to support de-energizing the normal power source for preventative maintenance. The connection to the alternate supply was completed and power was restored to the vent stack radiation monitors at 1845 CDT. While the radiation monitors were without power, pre-planned compensatory measures were implemented to monitor vent stack discharge and to minimize activities that posed a potential for release.
"At the completion of the preventive maintenance on the normal power supply, power to the vent stack radiation monitors will again be briefly interrupted to reconnect the normal power source to the monitors. The pre-planned compensatory measures will again be utilized during this power interruption. An update to this report will be provided following the restoration of normal power to the radiation monitors.
"The NRC Resident inspector has been informed."
* * * UPDATE AT 0400 EDT ON 4/29/13 FROM BRANNON PAYNE TO S. SANDIN * * *
"On 28 April, 2013, power was again interrupted to the Unit 2 vent stack radiation monitors to restore the connection to their normal power supply. The radiation monitors were out of service from 2315 until 2340 CDT. Pre-planned compensatory measures were again implemented to monitor vent stack discharge and minimize potential for vent stack release.
"The reported time for the initial loss of vent stack radiation monitoring on April 25, 2013 was incorrect. The correct time was 1759 CDT.
"The NRC Resident has been notified."
Notified R2DO (Sykes).
Power Reactor
Event Number: 48969
Facility: LASALLE
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-5,[2] GE-5
NRC Notified By: TODD GRANLUND
HQ OPS Officer: BILL HUFFMAN
Region: 3 State: IL
Unit: [] [2] []
RX Type: [1] GE-5,[2] GE-5
NRC Notified By: TODD GRANLUND
HQ OPS Officer: BILL HUFFMAN
Notification Date: 04/25/2013
Notification Time: 22:23 [ET]
Event Date: 04/25/2013
Event Time: 20:19 [CDT]
Last Update Date: 04/25/2013
Notification Time: 22:23 [ET]
Event Date: 04/25/2013
Event Time: 20:19 [CDT]
Last Update Date: 04/25/2013
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):
DAVID HILLS (R3DO)
DAVID HILLS (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | M/R | Y | 57 | Power Operation | 0 | Hot Shutdown |
MANUAL REACTOR SCRAM FOLLOWING TRIP OF CIRC WATER PUMPS
"This report is being made pursuant to 10CFR50.72(b)(2)(iv)(B), RPS Actuation (scram). At 2019 CDT on April 25, 2013, LaSalle Unit 2 was manually scrammed due to a loss of Condenser Circulating Water. The Unit was manually scrammed after the condenser circulating water pumps tripped due to high level in the turbine building condenser pit. The high level in the condenser pit was caused by a leak on the upper manway of the condenser water box during a maintenance activity. MSIV's were isolated due to loss of heat sink. The safety relief valves were used in pressure control mode. Current plant status: reactor level is stable and reactor pressure is stable. The condenser water box manway leak has been isolated. The plant will remain in hot shutdown pending investigation and repairs."
Reactor Core Isolation Cooling (RCIC) is being used in the pressure control mode.
The licensee has notified the NRC Resident Inspector.
"This report is being made pursuant to 10CFR50.72(b)(2)(iv)(B), RPS Actuation (scram). At 2019 CDT on April 25, 2013, LaSalle Unit 2 was manually scrammed due to a loss of Condenser Circulating Water. The Unit was manually scrammed after the condenser circulating water pumps tripped due to high level in the turbine building condenser pit. The high level in the condenser pit was caused by a leak on the upper manway of the condenser water box during a maintenance activity. MSIV's were isolated due to loss of heat sink. The safety relief valves were used in pressure control mode. Current plant status: reactor level is stable and reactor pressure is stable. The condenser water box manway leak has been isolated. The plant will remain in hot shutdown pending investigation and repairs."
Reactor Core Isolation Cooling (RCIC) is being used in the pressure control mode.
The licensee has notified the NRC Resident Inspector.