Event Notification Report for July 24, 2020
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/23/2020 - 07/24/2020
EVENT NUMBERS
54800
Power Reactor
Event Number: 54800
Facility: Sequoyah
Region: 2 State: TN
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Cal Atchley
HQ OPS Officer: Bethany Cecere
Region: 2 State: TN
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: Cal Atchley
HQ OPS Officer: Bethany Cecere
Notification Date: 07/24/2020
Notification Time: 09:00 [ET]
Event Date: 07/24/2020
Event Time: 01:05 [EDT]
Last Update Date: 07/24/2020
Notification Time: 09:00 [ET]
Event Date: 07/24/2020
Event Time: 01:05 [EDT]
Last Update Date: 07/24/2020
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(3)(v)(C) - Pot Uncntrl Rad Rel 50.72(b)(3)(v)(D) - Accident Mitigation
10 CFR Section:
50.72(b)(3)(v)(C) - Pot Uncntrl Rad Rel 50.72(b)(3)(v)(D) - Accident Mitigation
Person (Organization):
MARK MILLER (R2DO)
MARK MILLER (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
ICE BED INOPERABLE
"At 0105 [EDT] on 7/24/20 it was discovered Unit 2 Ice Bed was INOPERABLE. Therefore, since this is a single train system the requirements of 50.72 (b)(3)(v)(C) and (D) have been met. This condition is being reported as an 8-hour non-emergency NRC Notification.
"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
This condition put the unit in a 48-hour LCO. The old chillers were put into service to bring the temperature of the ICE bed down. At 0833 EDT, the technical specification limit was no longer exceeded and the unit exited the LCO.
"At 0105 [EDT] on 7/24/20 it was discovered Unit 2 Ice Bed was INOPERABLE. Therefore, since this is a single train system the requirements of 50.72 (b)(3)(v)(C) and (D) have been met. This condition is being reported as an 8-hour non-emergency NRC Notification.
"There was no impact on the health and safety of the public or plant personnel. The NRC Resident Inspector has been notified."
This condition put the unit in a 48-hour LCO. The old chillers were put into service to bring the temperature of the ICE bed down. At 0833 EDT, the technical specification limit was no longer exceeded and the unit exited the LCO.