Event Notification Report for August 26, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
08/25/2014 - 08/26/2014
Power Reactor
Event Number: 50404
Facility: BROWNS FERRY
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: NEEL SHUKLA
HQ OPS Officer: MARK ABRAMOVITZ
Region: 2 State: AL
Unit: [1] [] []
RX Type: [1] GE-4,[2] GE-4,[3] GE-4
NRC Notified By: NEEL SHUKLA
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 08/26/2014
Notification Time: 21:24 [ET]
Event Date: 08/26/2014
Event Time: 17:30 [CDT]
Last Update Date: 08/26/2014
Notification Time: 21:24 [ET]
Event Date: 08/26/2014
Event Time: 17:30 [CDT]
Last Update Date: 08/26/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
STEVE ROSE (R2DO)
STEVE ROSE (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | A/R | Y | 95 | Power Operation | 0 | Hot Shutdown |
TURBINE GENERATOR NEUTRAL OVERVOLTAGE CAUSES A REACTOR SCRAM
"At 1730 CDT on August 26, 2014, Browns Ferry Unit 1 experienced a turbine trip resulting in an automatic reactor scram. The cause of the turbine trip was a control valve fast closure signal that was generated by a turbine trip on generator neutral over voltage signal. The Main Steam Isolation Valves (MSIVs) remained open with the main turbine bypass valves controlling reactor pressure. The Reactor Feedwater Pumps are in service to control reactor water level.
"Primary Containment Isolation Systems (PCIS) Groups 2, 3, 6, and 8 isolation signals were received. Upon receipt of these signals, all required components actuated as required with the exception of Standby Gas Treatment (SBGT) train A, which is under a clearance for planned maintenance. Neither High Pressure Coolant Injection (HPCI) nor Reactor Core Isolation Cooling (RCIC) initiation signals were received. Initially, three Main Steam Relief Valves (MSRVs) opened to control the pressure surge and subsequently reclosed.
"This event requires a 4 hour report per 10 CFR 50.72(b)(2)(iv)(B), 'Any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation.'
"This event also requires an 8 hour report per 10 CFR 50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B), (1) Reactor protection system (RPS) including reactor scram or reactor trip, and (2) General containment Isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves (MSIVs).'
"The NRC Resident Inspector has been notified.
"Service Request 926468 was initiated in the Corrective Action Program."
The plant is in its normal shutdown electrical lineup. The licensee is investigating the cause of the generator neutral overvoltage signal. There was no impact on units 2 and 3.
"At 1730 CDT on August 26, 2014, Browns Ferry Unit 1 experienced a turbine trip resulting in an automatic reactor scram. The cause of the turbine trip was a control valve fast closure signal that was generated by a turbine trip on generator neutral over voltage signal. The Main Steam Isolation Valves (MSIVs) remained open with the main turbine bypass valves controlling reactor pressure. The Reactor Feedwater Pumps are in service to control reactor water level.
"Primary Containment Isolation Systems (PCIS) Groups 2, 3, 6, and 8 isolation signals were received. Upon receipt of these signals, all required components actuated as required with the exception of Standby Gas Treatment (SBGT) train A, which is under a clearance for planned maintenance. Neither High Pressure Coolant Injection (HPCI) nor Reactor Core Isolation Cooling (RCIC) initiation signals were received. Initially, three Main Steam Relief Valves (MSRVs) opened to control the pressure surge and subsequently reclosed.
"This event requires a 4 hour report per 10 CFR 50.72(b)(2)(iv)(B), 'Any event or condition that results in actuation of the reactor protection system (RPS) when the reactor is critical except when the actuation results from and is part of a pre-planned sequence during testing or reactor operation.'
"This event also requires an 8 hour report per 10 CFR 50.72(b)(3)(iv)(A), 'Any event or condition that results in valid actuation of any of the systems listed in paragraph (b)(3)(iv)(B), (1) Reactor protection system (RPS) including reactor scram or reactor trip, and (2) General containment Isolation signals affecting containment isolation valves in more than one system or multiple main steam isolation valves (MSIVs).'
"The NRC Resident Inspector has been notified.
"Service Request 926468 was initiated in the Corrective Action Program."
The plant is in its normal shutdown electrical lineup. The licensee is investigating the cause of the generator neutral overvoltage signal. There was no impact on units 2 and 3.
Power Reactor
Event Number: 50400
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: GERALD BAKER
HQ OPS Officer: CHARLES TEAL
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: GERALD BAKER
HQ OPS Officer: CHARLES TEAL
Notification Date: 08/26/2014
Notification Time: 11:54 [ET]
Event Date: 08/26/2014
Event Time: 07:59 [EDT]
Last Update Date: 08/26/2014
Notification Time: 11:54 [ET]
Event Date: 08/26/2014
Event Time: 07:59 [EDT]
Last Update Date: 08/26/2014
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):
RAY MCKINLEY (R1DO)
RAY MCKINLEY (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 HIGH RANGE STACK RADIATION MONITOR TAKEN OUT OF SERVICE FOR PRE-PLANNED MAINTENANCE
Millstone removed their unit 2 high range site radiation monitor, RM-8168, from service for pre-planned maintenance. RM-8168 was restored to service at 1012 EDT on 8/26/14.
The licensee notified the NRC Resident Inspector, the State of Connecticut, and the town of Waterford.
Millstone removed their unit 2 high range site radiation monitor, RM-8168, from service for pre-planned maintenance. RM-8168 was restored to service at 1012 EDT on 8/26/14.
The licensee notified the NRC Resident Inspector, the State of Connecticut, and the town of Waterford.
Agreement State
Event Number: 50401
Rep Org: COLORADO DEPT OF HEALTH
Licensee: TERRACON INC
Region: 4
City: COLORADO SPRINGS State: CO
County:
License #: 664-02
Agreement: Y
Docket:
NRC Notified By: CARRIE ROMANCHEK
HQ OPS Officer: CHARLES TEAL
Licensee: TERRACON INC
Region: 4
City: COLORADO SPRINGS State: CO
County:
License #: 664-02
Agreement: Y
Docket:
NRC Notified By: CARRIE ROMANCHEK
HQ OPS Officer: CHARLES TEAL
Notification Date: 08/26/2014
Notification Time: 16:25 [ET]
Event Date: 08/26/2014
Event Time: 09:48 [MDT]
Last Update Date: 08/26/2014
Notification Time: 16:25 [ET]
Event Date: 08/26/2014
Event Time: 09:48 [MDT]
Last Update Date: 08/26/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
10 CFR Section:
Person (Organization):
GREG PICK (R4DO)
FSME EVENT RESOUCE (EMAI)
GREG PICK (R4DO)
FSME EVENT RESOUCE (EMAI)
AGREEMENT STATE REPORT - MOISTURE DENSITY GAUGE RUN OVER BY A SKID-STEER
The following was received from the State of Colorado via email:
"At 0948 MDT on the morning of August 26, 2014, [the State of Colorado] was notified by the ARSO at Terracon, Inc (Colorado License # 664-02) that a Troxler 3430 moisture/density gauge had been run over by a skid-steer at a temporary job site. The source was locked in the shielded position when the gauge was hit. Surveys taken at the site confirmed that the source remained shielded.
"The gauge was placed in its transport case (Transport index confirmed) and taken to Instrotek for leak testing and analysis. Final results should be available within a week and initial results show no evidence of leakage.
"The investigation is still ongoing."
The following was received from the State of Colorado via email:
"At 0948 MDT on the morning of August 26, 2014, [the State of Colorado] was notified by the ARSO at Terracon, Inc (Colorado License # 664-02) that a Troxler 3430 moisture/density gauge had been run over by a skid-steer at a temporary job site. The source was locked in the shielded position when the gauge was hit. Surveys taken at the site confirmed that the source remained shielded.
"The gauge was placed in its transport case (Transport index confirmed) and taken to Instrotek for leak testing and analysis. Final results should be available within a week and initial results show no evidence of leakage.
"The investigation is still ongoing."