Event Notification Report for September 25, 2011
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/24/2011 - 09/25/2011
Power Reactor
Event Number: 47290
Facility: PALISADES
Region: 3 State: MI
Unit: [1] [] []
RX Type: [1] CE
NRC Notified By: BRUCE BAUER
HQ OPS Officer: JOHN KNOKE
Region: 3 State: MI
Unit: [1] [] []
RX Type: [1] CE
NRC Notified By: BRUCE BAUER
HQ OPS Officer: JOHN KNOKE
Notification Date: 09/25/2011
Notification Time: 18:21 [ET]
Event Date: 09/25/2011
Event Time: 15:06 [EDT]
Last Update Date: 09/25/2011
Notification Time: 18:21 [ET]
Event Date: 09/25/2011
Event Time: 15:06 [EDT]
Last Update Date: 09/25/2011
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):
ANN MARIE STONE (R3DO)
ANN MARIE STONE (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
REACTOR TRIP DUE TO LOSS OF TWO 120 VOLT AC INSTRUMENT BUSSES
"At 1506 EDT, while the electricians were working on the left train DC bus, a bus bar slipped causing an arc and a loss of the left train DC busses D-10 L and D-10 R. This resulted in the loss of two preferred AC [120 Volt Instrument] busses Y-10 and Y-30. The loss of both preferred AC busses caused a reactor trip, a safety injection signal, auxiliary feedwater actuation signal, containment high radiation isolation signal, and main steam isolation signal.
"All systems responded as expected. Electric power has been restored to the affected DC busses and preferred AC busses. The plant is stable in Mode 3 at NOT and NOP, and controlling temperature using Atmospheric Dump Valves. Pressurizer level is high due to the loss of letdown (result of containment isolation signal), however, it is recovering slowly."
All rods fully inserted and the electrical lineup is back to normal.
The licensee has notified the NRC Resident Inspector, and will be notifying local agencies. The licensee will also be issuing a press release.
"At 1506 EDT, while the electricians were working on the left train DC bus, a bus bar slipped causing an arc and a loss of the left train DC busses D-10 L and D-10 R. This resulted in the loss of two preferred AC [120 Volt Instrument] busses Y-10 and Y-30. The loss of both preferred AC busses caused a reactor trip, a safety injection signal, auxiliary feedwater actuation signal, containment high radiation isolation signal, and main steam isolation signal.
"All systems responded as expected. Electric power has been restored to the affected DC busses and preferred AC busses. The plant is stable in Mode 3 at NOT and NOP, and controlling temperature using Atmospheric Dump Valves. Pressurizer level is high due to the loss of letdown (result of containment isolation signal), however, it is recovering slowly."
All rods fully inserted and the electrical lineup is back to normal.
The licensee has notified the NRC Resident Inspector, and will be notifying local agencies. The licensee will also be issuing a press release.
Power Reactor
Event Number: 47291
Facility: CALLAWAY
Region: 4 State: MO
Unit: [1] [] []
RX Type: [1] W-4-LP
NRC Notified By: DAVID HURT
HQ OPS Officer: JOHN KNOKE
Region: 4 State: MO
Unit: [1] [] []
RX Type: [1] W-4-LP
NRC Notified By: DAVID HURT
HQ OPS Officer: JOHN KNOKE
Notification Date: 09/25/2011
Notification Time: 19:48 [ET]
Event Date: 09/25/2011
Event Time: 18:04 [CDT]
Last Update Date: 09/30/2011
Notification Time: 19:48 [ET]
Event Date: 09/25/2011
Event Time: 18:04 [CDT]
Last Update Date: 09/30/2011
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):
JAMES DRAKE (R4DO)
JAMES DRAKE (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
TECHNICAL SUPPORT CENTER OUT OF SERVICE FOR PLANNED MAINTENANCE
"At 1804 on Sunday, September 25, the Callaway Plant Technical Support Center (TSC) will undergo planned maintenance to replace the building's heating, ventilation, and air conditioning (HVAC) system. This maintenance is currently scheduled to last for approximately five days, at which time the TSC will be restored to service. During this period, the TSC's HVAC system will not be able to provide positive pressure to the TSC, thus rendering it non-functional.
"If an emergency is declared requiring TSC activation while the TSC is non-functional, TSC emergency response personnel will report to their backup locations in accordance with Callaway Plant emergency planning procedures.
"This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the planned unavailability of an emergency response facility.
"The NRC Resident Inspector has been notified."
* * * UPDATE FROM TIM HOLLAND TO HOWIE CROUCH AT 2027 EDT ON 9/30/1 * * *
"At 1804 CDT on September 25, 2011, the Callaway Plant Technical Support Center (TSC) underwent planned maintenance to replace the building's heating, ventilation, and air conditioning (HVAC) system. While this maintenance was being performed, the TSC was unable to maintain positive pressure within the building, thus rendering it non-functional.
"This ENS update is to document that, at 1800 on September 30, 2011, the Callaway Plant TSC was returned to service following successful completion of planned maintenance on the building HVAC system.
"The NRC Senior Resident Inspector has been notified."
Notified R4DO (Werner).
"At 1804 on Sunday, September 25, the Callaway Plant Technical Support Center (TSC) will undergo planned maintenance to replace the building's heating, ventilation, and air conditioning (HVAC) system. This maintenance is currently scheduled to last for approximately five days, at which time the TSC will be restored to service. During this period, the TSC's HVAC system will not be able to provide positive pressure to the TSC, thus rendering it non-functional.
"If an emergency is declared requiring TSC activation while the TSC is non-functional, TSC emergency response personnel will report to their backup locations in accordance with Callaway Plant emergency planning procedures.
"This notification is being made in accordance with 10 CFR 50.72(b)(3)(xiii) due to the planned unavailability of an emergency response facility.
"The NRC Resident Inspector has been notified."
* * * UPDATE FROM TIM HOLLAND TO HOWIE CROUCH AT 2027 EDT ON 9/30/1 * * *
"At 1804 CDT on September 25, 2011, the Callaway Plant Technical Support Center (TSC) underwent planned maintenance to replace the building's heating, ventilation, and air conditioning (HVAC) system. While this maintenance was being performed, the TSC was unable to maintain positive pressure within the building, thus rendering it non-functional.
"This ENS update is to document that, at 1800 on September 30, 2011, the Callaway Plant TSC was returned to service following successful completion of planned maintenance on the building HVAC system.
"The NRC Senior Resident Inspector has been notified."
Notified R4DO (Werner).