Event Notification Report for December 12, 2017
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
12/11/2017 - 12/12/2017
EVENT NUMBERS
53115531165311753118
Power Reactor
Event Number: 53115
Facility: GRAND GULF
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: RYAN MEYER
HQ OPS Officer: STEVEN VITTO
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: RYAN MEYER
HQ OPS Officer: STEVEN VITTO
Notification Date: 12/12/2017
Notification Time: 17:40 [ET]
Event Date: 12/12/2017
Event Time: 09:18 [CST]
Last Update Date: 12/12/2017
Notification Time: 17:40 [ET]
Event Date: 12/12/2017
Event Time: 09:18 [CST]
Last Update Date: 12/12/2017
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 | Y | 16 | Power Operation | 16 | Power Operation |
AUTOMATIC START OF EDG DUE TO LOSS OF ESF TRANSFORMER
"At approximately 0918 CST on Tuesday, December 12, 2017, the Grand Gulf Nuclear Station experienced a loss of the Engineered Safety Features (ESF) Transformer 11 which was powering the Division 1 ESF bus. Subsequently, the station experienced an automatic start of the Division 1 Emergency Diesel Generator [EDG], partial isolation of the primary and secondary containment buildings and the isolation of the Reactor Core Isolation Cooling System [RCIC].
"It is not currently understood why the RCIC system isolated during this event. A team is investigating this issue separately from the loss of the ESF 11 transformer.
"The cause of the event is under investigation at this time.
"No other issues or unexpected events occurred.
"The NRC Resident Inspector has been notified of the event."
"At approximately 0918 CST on Tuesday, December 12, 2017, the Grand Gulf Nuclear Station experienced a loss of the Engineered Safety Features (ESF) Transformer 11 which was powering the Division 1 ESF bus. Subsequently, the station experienced an automatic start of the Division 1 Emergency Diesel Generator [EDG], partial isolation of the primary and secondary containment buildings and the isolation of the Reactor Core Isolation Cooling System [RCIC].
"It is not currently understood why the RCIC system isolated during this event. A team is investigating this issue separately from the loss of the ESF 11 transformer.
"The cause of the event is under investigation at this time.
"No other issues or unexpected events occurred.
"The NRC Resident Inspector has been notified of the event."
Power Reactor
Event Number: 53116
Facility: SOUTH TEXAS
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: BRAD HARDT
HQ OPS Officer: STEVEN VITTO
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: BRAD HARDT
HQ OPS Officer: STEVEN VITTO
Notification Date: 12/12/2017
Notification Time: 17:52 [ET]
Event Date: 12/12/2017
Event Time: 15:19 [CST]
Last Update Date: 12/12/2017
Notification Time: 17:52 [ET]
Event Date: 12/12/2017
Event Time: 15:19 [CST]
Last Update Date: 12/12/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
10 CFR Section:
50.72(b)(2)(xi) - OFFSITE NOTIFICATION
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 | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
OFFSITE NOTIFICATION DUE TO INADVERTENT ACTUATION OF EMERGENCY NOTIFICATION SIREN
"A South Texas Project [STP] Offsite Emergency Notification Siren (#7) was inadvertently going off. A resident who lived near the siren notified the Matagorda County Sheriff's Office at 0905 CST of the event and subsequently left a message with the STP Emergency Response staff. The Emergency Response staff dispatched maintenance to repair the siren and then later notified the Control Room at 1519 CST that the Sheriff's department was notified. The siren was inspected and reset. No issues were found with the siren.
"The Matagorda County Sheriff's Office was the only offsite agency that has been notified.
"The NRC Resident Inspector has been notified."
"A South Texas Project [STP] Offsite Emergency Notification Siren (#7) was inadvertently going off. A resident who lived near the siren notified the Matagorda County Sheriff's Office at 0905 CST of the event and subsequently left a message with the STP Emergency Response staff. The Emergency Response staff dispatched maintenance to repair the siren and then later notified the Control Room at 1519 CST that the Sheriff's department was notified. The siren was inspected and reset. No issues were found with the siren.
"The Matagorda County Sheriff's Office was the only offsite agency that has been notified.
"The NRC Resident Inspector has been notified."
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 53117
Facility: GRAND GULF
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: WESLEY MARSHALL
HQ OPS Officer: STEVEN VITTO
Region: 4 State: MS
Unit: [1] [] []
RX Type: [1] GE-6
NRC Notified By: WESLEY MARSHALL
HQ OPS Officer: STEVEN VITTO
Notification Date: 12/12/2017
Notification Time: 00:00 [ET]
Event Date: 12/12/2017
Event Time: 00:00 [CST]
Last Update Date: 12/27/2017
Notification Time: 00:00 [ET]
Event Date: 12/12/2017
Event Time: 00:00 [CST]
Last Update Date: 12/27/2017
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
10 CFR Section:
50.72(b)(3)(v)(D) - ACCIDENT MITIGATION
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 | Y | 15 | Power Operation | 15 | Power Operation |
HIGH PRESSURE CORE SPRAY DECLARED INOPERABLE
"At approximately 1330 CST on Tuesday, December 12, 2017, Grand Gulf Nuclear Station declared Division 3 'C' Battery inoperable due to questions concerning battery terminal connection continuity. Technical Specification 3.8.4, DC Sources - Operating, Condition E, Required Action E.1, requires the station to declare the High Pressure Core Spray System inoperable immediately. The Division 3 'C' Battery and High Pressure Core Spray System was declared operable and the LCOs [Limiting condition of operation] were declared met at 1731CST on Tuesday, December 12, 2017. Based on field measurements of terminal torque and resistance, the as-found and as-left terminal resistance micro-ohm readings indicated satisfactorily all times. Formal evaluation of the as-found condition of the battery is in progress.
"This report is to notify the NRC of a loss of safety function on the High Pressure Core Spray System."
The NRC Resident Inspector was notified.
* * * UPDATE AT 1612 EST ON 12/27/17 FROM GERRY ELLIS TO S. SANDIN * * *
The report is retracted based on the following:
"This was initially reported under 50.72(b)(3)(v)(D). However, after subsequent investigation of the identified condition, a degraded condition was confirmed to not exist. The 1C3 battery bank connections were torque checked, inspected, and resistance values were checked. All torque, resistance values and seismic condition were confirmed to be satisfactory. The operability evaluation confirmed that the battery was and remained operable, and therefore the initial determination of operability and reportability was incorrect.
"Division 3 Battery 1C3 was at the time of discovery OPERABLE and therefore this is not a reportable condition."
The licensee informed the NRC Resident Inspector.
Notified the R4DO (Haire).
"At approximately 1330 CST on Tuesday, December 12, 2017, Grand Gulf Nuclear Station declared Division 3 'C' Battery inoperable due to questions concerning battery terminal connection continuity. Technical Specification 3.8.4, DC Sources - Operating, Condition E, Required Action E.1, requires the station to declare the High Pressure Core Spray System inoperable immediately. The Division 3 'C' Battery and High Pressure Core Spray System was declared operable and the LCOs [Limiting condition of operation] were declared met at 1731CST on Tuesday, December 12, 2017. Based on field measurements of terminal torque and resistance, the as-found and as-left terminal resistance micro-ohm readings indicated satisfactorily all times. Formal evaluation of the as-found condition of the battery is in progress.
"This report is to notify the NRC of a loss of safety function on the High Pressure Core Spray System."
The NRC Resident Inspector was notified.
* * * UPDATE AT 1612 EST ON 12/27/17 FROM GERRY ELLIS TO S. SANDIN * * *
The report is retracted based on the following:
"This was initially reported under 50.72(b)(3)(v)(D). However, after subsequent investigation of the identified condition, a degraded condition was confirmed to not exist. The 1C3 battery bank connections were torque checked, inspected, and resistance values were checked. All torque, resistance values and seismic condition were confirmed to be satisfactory. The operability evaluation confirmed that the battery was and remained operable, and therefore the initial determination of operability and reportability was incorrect.
"Division 3 Battery 1C3 was at the time of discovery OPERABLE and therefore this is not a reportable condition."
The licensee informed the NRC Resident Inspector.
Notified the R4DO (Haire).
Power Reactor
Event Number: 53118
Facility: SOUTH TEXAS
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ROBERT TATRO
HQ OPS Officer: STEVEN VITTO
Region: 4 State: TX
Unit: [1] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: ROBERT TATRO
HQ OPS Officer: STEVEN VITTO
Notification Date: 12/12/2017
Notification Time: 23:04 [ET]
Event Date: 12/12/2017
Event Time: 17:57 [CST]
Last Update Date: 12/12/2017
Notification Time: 23:04 [ET]
Event Date: 12/12/2017
Event Time: 17:57 [CST]
Last Update Date: 12/12/2017
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):
RICK DEESE (R4DO)
RICK DEESE (R4DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 1 | N | Y | 100 | Power Operation | 100 | Power Operation |
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
UNPLANNED LOSS OF EMERGENCY RESPONSE EQUIPMENT
"At 1757 CST on December 12, 2017, South Texas Project Electric Generating Station (STPEGS) Unit 1 and Unit 2 experienced an unplanned partial loss of the Integrated Computer System (ICS). The partial loss of Unit 1 and Unit 2 ICS resulted in a major loss of emergency assessment capability to STPEGS Unit 1 and Unit 2 Technical Support Center (TSC) for greater than 75 minutes. Assessment capability has been verified to be available in the Emergency Operations Facility (EOF).
"This report is being made pursuant to 10 CFR 50.72(b)(3)(xiii), any event that results in a major loss of emergency assessment capability, off site response capability, or off site communications ability.
"The NRC Resident Inspector has been informed."
"At 1757 CST on December 12, 2017, South Texas Project Electric Generating Station (STPEGS) Unit 1 and Unit 2 experienced an unplanned partial loss of the Integrated Computer System (ICS). The partial loss of Unit 1 and Unit 2 ICS resulted in a major loss of emergency assessment capability to STPEGS Unit 1 and Unit 2 Technical Support Center (TSC) for greater than 75 minutes. Assessment capability has been verified to be available in the Emergency Operations Facility (EOF).
"This report is being made pursuant to 10 CFR 50.72(b)(3)(xiii), any event that results in a major loss of emergency assessment capability, off site response capability, or off site communications ability.
"The NRC Resident Inspector has been informed."