Event Notification Report for July 26, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
07/25/2015 - 07/26/2015
Power Reactor
Event Number: 51263
Facility: CLINTON
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: KEVIN MITCHELL
HQ OPS Officer: HOWIE CROUCH
Region: 3 State: IL
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: KEVIN MITCHELL
HQ OPS Officer: HOWIE CROUCH
Notification Date: 07/26/2015
Notification Time: 11:50 [ET]
Event Date: 07/26/2015
Event Time: 04:49 [CDT]
Last Update Date: 07/26/2015
Notification Time: 11:50 [ET]
Event Date: 07/26/2015
Event Time: 04:49 [CDT]
Last Update Date: 07/26/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
AARON MCCRAW (R3DO)
AARON MCCRAW (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 99 | Power Operation | 99 | Power Operation |
INVALID SEISMIC EVENT ALARM
"At 0449 CDT on July 26, 2015, the station's Seismic Instrumentation generated a seismic event alarm that was determined to be invalid based upon no seismic activity being felt on site, and no activity detected in the area by either the National Earthquake Information Center, or nearby Exelon plants. The instrumentation that actuated recorded a value of 0.0449 g on a single axis of one instrument, which is greater than the 0.02 g threshold value in the Emergency Action Level in the station's emergency procedures; however, no other instrument channel or axis indicated a valid event exceeding the 0.02 g threshold. Since the event alarm was determined to be invalid as described above, no EAL thresholds were met.
"The seismic instrumentation was declared non-functional since it would not generate a seismic event alarm during an actual event until the invalid event was reset. The alarm was reset through the alarm reset process. The seismic instrumentation was declared functional and returned to service at 0520.
"This resulted in a Loss of Emergency Assessment Capability while the Seismic Instrumentation was out of service. This is a reportable condition in accordance with 10 CFR 50.72(b)(3)(xiii).
"The licensee has notified the NRC Resident Inspector."
"At 0449 CDT on July 26, 2015, the station's Seismic Instrumentation generated a seismic event alarm that was determined to be invalid based upon no seismic activity being felt on site, and no activity detected in the area by either the National Earthquake Information Center, or nearby Exelon plants. The instrumentation that actuated recorded a value of 0.0449 g on a single axis of one instrument, which is greater than the 0.02 g threshold value in the Emergency Action Level in the station's emergency procedures; however, no other instrument channel or axis indicated a valid event exceeding the 0.02 g threshold. Since the event alarm was determined to be invalid as described above, no EAL thresholds were met.
"The seismic instrumentation was declared non-functional since it would not generate a seismic event alarm during an actual event until the invalid event was reset. The alarm was reset through the alarm reset process. The seismic instrumentation was declared functional and returned to service at 0520.
"This resulted in a Loss of Emergency Assessment Capability while the Seismic Instrumentation was out of service. This is a reportable condition in accordance with 10 CFR 50.72(b)(3)(xiii).
"The licensee has notified the NRC Resident Inspector."
Power Reactor
Event Number: 51264
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: JOHN HUFF
HQ OPS Officer: JEFF ROTTON
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: JOHN HUFF
HQ OPS Officer: JEFF ROTTON
Notification Date: 07/26/2015
Notification Time: 22:08 [ET]
Event Date: 07/26/2015
Event Time: 20:25 [EDT]
Last Update Date: 07/26/2015
Notification Time: 22:08 [ET]
Event Date: 07/26/2015
Event Time: 20:25 [EDT]
Last Update Date: 07/26/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
SILAS KENNEDY (R1DO)
SILAS KENNEDY (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 |
UNIT 2 SITE STACK RADIATION MONITOR FAILURE
"The Millstone Site Rad Monitor, RM-8169, has failed and was declared NOT FUNCTIONAL at 2025 [EDT] on July 26, 2015.
"This is reportable pursuant to 10CFR50.72(b)(3)(xiii), as any event that results in a major loss of emergency assessment capability, off-site response capability, or off-site communication capability.
"I&C [Instrumentation and Control] is developing a troubleshooting and repair plan."
The licensee notified the NRC Resident Inspector, the State of Connecticut Department of Energy and Environmental Protection, and the City of Waterford Dispatch.
The loss of this radiation monitor is considered a major loss of assessment capability since it is used in Emergency Action Level (EAL) classification and there is no compensatory measure available.
"The Millstone Site Rad Monitor, RM-8169, has failed and was declared NOT FUNCTIONAL at 2025 [EDT] on July 26, 2015.
"This is reportable pursuant to 10CFR50.72(b)(3)(xiii), as any event that results in a major loss of emergency assessment capability, off-site response capability, or off-site communication capability.
"I&C [Instrumentation and Control] is developing a troubleshooting and repair plan."
The licensee notified the NRC Resident Inspector, the State of Connecticut Department of Energy and Environmental Protection, and the City of Waterford Dispatch.
The loss of this radiation monitor is considered a major loss of assessment capability since it is used in Emergency Action Level (EAL) classification and there is no compensatory measure available.