Event Notification Report for March 31, 2017
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
03/30/2017 - 03/31/2017
EVENT NUMBERS
52655
Power Reactor
Event Number: 52655
Facility: PILGRIM
Region: 1 State: MA
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: KENNETH GRACIA
HQ OPS Officer: VINCE KLCO
Region: 1 State: MA
Unit: [1] [] []
RX Type: [1] GE-3
NRC Notified By: KENNETH GRACIA
HQ OPS Officer: VINCE KLCO
Notification Date: 03/31/2017
Notification Time: 19:14 [ET]
Event Date: 03/31/2017
Event Time: 11:55 [EDT]
Last Update Date: 03/31/2017
Notification Time: 19:14 [ET]
Event Date: 03/31/2017
Event Time: 11:55 [EDT]
Last Update Date: 03/31/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
Person (Organization):
BILL COOK (R1DO)
BILL COOK (R1DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 97 | Power Operation | 97 | Power Operation |
PRESSURE SUPPRESSION POOL DECLARED INOPERABLE DUE TO TORUS HIGH WATER LEVEL
"On March 31, 2017 at 1155 hours [EDT], with the reactor at 97% core thermal power and steady state conditions, operators inadvertently caused water level to rise in the Pressure Suppression Pool (TORUS). Pilgrim Nuclear Power Station (PNPS) was restoring normal system valve line-ups after performing flushing of the suction piping of the Core Spray system in accordance with station procedures. During the process of restoring the appropriate valve line-ups, water was inadvertently transferred to the TORUS from the Condensate Storage Tank. The cause of the event is understood.
"The Technical Specification (TS) Limiting Condition for Operation (LCO) Action Statement (AS) 3.7.A.5 was entered. The LCO AS was exited at 1540 when TORUS water level was restored to the limits specified in LCO's 3.7.A.1.b and 3.7.A.1.m. Because the TORUS was declared inoperable, PNPS is providing an 8-hour non-emergency notification in accordance with 10 CFR 50.72(b)(3)(v)(D), an event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident.
"This was a case of the water level in the TORUS being above the TS limit. The TORUS was potentially available to provide cooling to the reactor if required.
"The NRC Resident Inspector has been notified."
The licensee notified the Commonwealth of Massachusetts and Plymouth County.
"On March 31, 2017 at 1155 hours [EDT], with the reactor at 97% core thermal power and steady state conditions, operators inadvertently caused water level to rise in the Pressure Suppression Pool (TORUS). Pilgrim Nuclear Power Station (PNPS) was restoring normal system valve line-ups after performing flushing of the suction piping of the Core Spray system in accordance with station procedures. During the process of restoring the appropriate valve line-ups, water was inadvertently transferred to the TORUS from the Condensate Storage Tank. The cause of the event is understood.
"The Technical Specification (TS) Limiting Condition for Operation (LCO) Action Statement (AS) 3.7.A.5 was entered. The LCO AS was exited at 1540 when TORUS water level was restored to the limits specified in LCO's 3.7.A.1.b and 3.7.A.1.m. Because the TORUS was declared inoperable, PNPS is providing an 8-hour non-emergency notification in accordance with 10 CFR 50.72(b)(3)(v)(D), an event or condition that could have prevented fulfillment of a safety function needed to mitigate the consequences of an accident.
"This was a case of the water level in the TORUS being above the TS limit. The TORUS was potentially available to provide cooling to the reactor if required.
"The NRC Resident Inspector has been notified."
The licensee notified the Commonwealth of Massachusetts and Plymouth County.