Event Notification Report for September 25, 2016
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
09/24/2016 - 09/25/2016
Power Reactor
Event Number: 52261
Facility: COOPER
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: KYLE SAYLER
HQ OPS Officer: DONALD NORWOOD
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: KYLE SAYLER
HQ OPS Officer: DONALD NORWOOD
Notification Date: 09/25/2016
Notification Time: 04:23 [ET]
Event Date: 09/25/2016
Event Time: 01:03 [CDT]
Last Update Date: 09/25/2016
Notification Time: 04:23 [ET]
Event Date: 09/25/2016
Event Time: 01:03 [CDT]
Last Update Date: 09/25/2016
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):
RICK DEESE (R4DO)
RICK DEESE (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Hot Shutdown | 0 | Hot Shutdown |
ACTUATION OF GROUP 1 ISOLATION SIGNAL
"At 0103 CDT a Group 1 Isolation signal was received on Main Steam Line (MSL) A High Flow while attempting to un-isolate MSL A.
"During plant cooldown for refueling outage, all inboard MSIV's were closed to minimize steam flow to control cooldown rate. With all inboard MSIV's closed and all outboard MSIV's open, MSL drains in-service, and reactor pressure at approximately 330 psig, an attempt was made to un-isolate MSL A by opening A inboard MSIV. This resulted in a MSL high flow signal on MSL A as the valve was being opened, resulting in a Group I Isolation and closure of all MSIV's and MSL Drain Valves. Pressure was equalized to less than 200 psid across MSIV A prior to attempting to open the valve in accordance with plant procedures. All valves actuated as expected and the cause of the event is under investigation. There are no indications of a leak. The Group I Isolation has been reset."
The licensee notified the NRC Resident Inspector.
"At 0103 CDT a Group 1 Isolation signal was received on Main Steam Line (MSL) A High Flow while attempting to un-isolate MSL A.
"During plant cooldown for refueling outage, all inboard MSIV's were closed to minimize steam flow to control cooldown rate. With all inboard MSIV's closed and all outboard MSIV's open, MSL drains in-service, and reactor pressure at approximately 330 psig, an attempt was made to un-isolate MSL A by opening A inboard MSIV. This resulted in a MSL high flow signal on MSL A as the valve was being opened, resulting in a Group I Isolation and closure of all MSIV's and MSL Drain Valves. Pressure was equalized to less than 200 psid across MSIV A prior to attempting to open the valve in accordance with plant procedures. All valves actuated as expected and the cause of the event is under investigation. There are no indications of a leak. The Group I Isolation has been reset."
The licensee notified the NRC Resident Inspector.
Power Reactor
Event Number: 52262
Facility: COOPER
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: BRIAN STANDER
HQ OPS Officer: JEFF HERRERA
Region: 4 State: NE
Unit: [1] [] []
RX Type: [1] GE-4
NRC Notified By: BRIAN STANDER
HQ OPS Officer: JEFF HERRERA
Notification Date: 09/25/2016
Notification Time: 12:58 [ET]
Event Date: 09/25/2016
Event Time: 09:15 [CDT]
Last Update Date: 09/25/2016
Notification Time: 12:58 [ET]
Event Date: 09/25/2016
Event Time: 09:15 [CDT]
Last Update Date: 09/25/2016
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION 50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION 50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
RICK DEESE (R4DO)
RICK DEESE (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | N | 0 | Hot Shutdown | 0 | Hot Shutdown |
COOPER NUCLEAR STATION LOSS OF TONE ALERT RADIOS
"At 0915 CDT on 9/25/2016, Cooper Nuclear Station was notified by the National Weather Service that the Shubert radio transmission tower was not functioning. This affects the tone alert radios used to notify the public in the event of an emergency condition. This is considered to be a major loss of the public prompt notification system capability and is reportable under 10 CFR 50.72(b)(3)(xiii).
"Nemaha, NE, Richardson, NE, and Atchison, MO county authorities within the 10 mile EPZ were notified by Cooper Nuclear Station of the condition and the effect on the tone alert radios and will utilize the backup notification method making this condition reportable under 10 CFR 50.72(b)(2)(xi) for notification of other government agencies.
"Estimated return to service time is unknown. The cause of the failure is unknown.
"The NRC Senior Resident Inspector has been notified of this condition."
"At 0915 CDT on 9/25/2016, Cooper Nuclear Station was notified by the National Weather Service that the Shubert radio transmission tower was not functioning. This affects the tone alert radios used to notify the public in the event of an emergency condition. This is considered to be a major loss of the public prompt notification system capability and is reportable under 10 CFR 50.72(b)(3)(xiii).
"Nemaha, NE, Richardson, NE, and Atchison, MO county authorities within the 10 mile EPZ were notified by Cooper Nuclear Station of the condition and the effect on the tone alert radios and will utilize the backup notification method making this condition reportable under 10 CFR 50.72(b)(2)(xi) for notification of other government agencies.
"Estimated return to service time is unknown. The cause of the failure is unknown.
"The NRC Senior Resident Inspector has been notified of this condition."