Event Notification Report for June 21, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
06/20/2015 - 06/21/2015
EVENT NUMBERS
51168
Power Reactor
Event Number: 51168
Facility: LIMERICK
Region: 1 State: PA
Unit: [] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: DAN WILLIAMSON
HQ OPS Officer: STEVE SANDIN
Region: 1 State: PA
Unit: [] [2] []
RX Type: [1] GE-4,[2] GE-4
NRC Notified By: DAN WILLIAMSON
HQ OPS Officer: STEVE SANDIN
Notification Date: 06/21/2015
Notification Time: 20:25 [ET]
Event Date: 06/21/2015
Event Time: 16:25 [EDT]
Last Update Date: 06/21/2015
Notification Time: 20:25 [ET]
Event Date: 06/21/2015
Event Time: 16:25 [EDT]
Last Update Date: 06/21/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
BRICE BICKETT (R1DO)
BRICE BICKETT (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
MANUAL SECONDARY CONTAINMENT ISOLATION
"In response to a trip of Unit 2 reactor enclosure HVAC [Heating, Ventilation and Air Conditioning], subsequent loss of reactor enclosure delta-p and rising reactor enclosure room temperatures, a Unit 2 manual secondary containment isolation was initiated per station procedures. This manual isolation also resulted in an isolation signal to containment atmosphere control (CAC) system valves and primary containment instrument gas (PCIG) system valves. System responses were as expected.
"Unit 2 secondary containment delta-p and room temperatures were restored via the standby gas treatment system (SGTS), and Unit 2 secondary containment integrity remains intact and operable.
"Investigation of the trip of Unit 2 reactor enclosure HVAC is ongoing.
"This is being reported under 50.72(b)(3)(iv)(A) for containment isolation signal affecting containment isolation valves in more than one system."
The licensee informed the NRC Resident Inspector.
"In response to a trip of Unit 2 reactor enclosure HVAC [Heating, Ventilation and Air Conditioning], subsequent loss of reactor enclosure delta-p and rising reactor enclosure room temperatures, a Unit 2 manual secondary containment isolation was initiated per station procedures. This manual isolation also resulted in an isolation signal to containment atmosphere control (CAC) system valves and primary containment instrument gas (PCIG) system valves. System responses were as expected.
"Unit 2 secondary containment delta-p and room temperatures were restored via the standby gas treatment system (SGTS), and Unit 2 secondary containment integrity remains intact and operable.
"Investigation of the trip of Unit 2 reactor enclosure HVAC is ongoing.
"This is being reported under 50.72(b)(3)(iv)(A) for containment isolation signal affecting containment isolation valves in more than one system."
The licensee informed the NRC Resident Inspector.