Event Notification Report for October 22, 2022
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
10/21/2022 - 10/22/2022
EVENT NUMBERS
56174
56174
Power Reactor
Event Number: 56174
Facility: Cooper
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: Roy Giles
HQ OPS Officer: Adam Koziol
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: Roy Giles
HQ OPS Officer: Adam Koziol
Notification Date: 10/22/2022
Notification Time: 17:36 [ET]
Event Date: 10/22/2022
Event Time: 12:58 [CDT]
Last Update Date: 10/22/2022
Notification Time: 17:36 [ET]
Event Date: 10/22/2022
Event Time: 12:58 [CDT]
Last Update Date: 10/22/2022
Emergency Class: Non Emergency
10 CFR Section:
50.72(b)(2)(iv)(A) - Eccs Injection 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
10 CFR Section:
50.72(b)(2)(iv)(A) - Eccs Injection 50.72(b)(3)(iv)(A) - Valid Specif Sys Actuation
Person (Organization):
Groom, Jeremy (R4DO)
Felts, Russell (NRR EO)
Whited, Jeffrey (IR)
Groom, Jeremy (R4DO)
Felts, Russell (NRR EO)
Whited, Jeffrey (IR)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Refueling | 0 | Refueling |
ECCS INJECTION WHILE SHUTDOWN
The following information was provided by the licensee via fax:
"During Mode 5 Refueling operations, while attempting to establish flow through the Fuel Pool Cooling system filter demineralizers, an air operated valve to a radioactive waste tank failed to close automatically. This caused the Fuel Pool Cooling system to pump water from the Skimmer Surge Tanks (SST) to the radioactive liquid waste system. In response to the loss of inventory from the SSTs, the Control Room operating crew started Core Spray Pump A to restore normal operating level In the SST. This prevented the loss of the Fuel Pool Cooling/Alternate Decay Heat Removal system which was the only in service system meeting the safety function of decay heat removal. Core Spray Pump A was used for Injection for less than 3 minutes.
"This is reportable as a discharge of ECCS into the RCS in response to an event, but not part of a pre-planned sequence under 10 CFR 50.72(b)(2)(iv)(A) and actuation of a specified system under 10 CFR 50.72(b)(3)(Iv)(A)."
The resident inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
Licensee reported approximately 6000-7000 gallons of water was injected into the RCS. The stuck open air operated valve was closed. Proceeding with refueling outage operations.
The following information was provided by the licensee via fax:
"During Mode 5 Refueling operations, while attempting to establish flow through the Fuel Pool Cooling system filter demineralizers, an air operated valve to a radioactive waste tank failed to close automatically. This caused the Fuel Pool Cooling system to pump water from the Skimmer Surge Tanks (SST) to the radioactive liquid waste system. In response to the loss of inventory from the SSTs, the Control Room operating crew started Core Spray Pump A to restore normal operating level In the SST. This prevented the loss of the Fuel Pool Cooling/Alternate Decay Heat Removal system which was the only in service system meeting the safety function of decay heat removal. Core Spray Pump A was used for Injection for less than 3 minutes.
"This is reportable as a discharge of ECCS into the RCS in response to an event, but not part of a pre-planned sequence under 10 CFR 50.72(b)(2)(iv)(A) and actuation of a specified system under 10 CFR 50.72(b)(3)(Iv)(A)."
The resident inspector has been notified.
The following additional information was obtained from the licensee in accordance with Headquarters Operations Officers Report Guidance:
Licensee reported approximately 6000-7000 gallons of water was injected into the RCS. The stuck open air operated valve was closed. Proceeding with refueling outage operations.