Event Notification Report for May 25, 2014
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
05/24/2014 - 05/25/2014
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 50149
Facility: COOK
Region: 3 State: MI
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: KELLY BAKER
HQ OPS Officer: MARK ABRAMOVITZ
Region: 3 State: MI
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: KELLY BAKER
HQ OPS Officer: MARK ABRAMOVITZ
Notification Date: 05/29/2014
Notification Time: 14:10 [ET]
Event Date: 05/25/2014
Event Time: 09:42 [EDT]
Last Update Date: 06/20/2014
Notification Time: 14:10 [ET]
Event Date: 05/25/2014
Event Time: 09:42 [EDT]
Last Update Date: 06/20/2014
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):
ANN MARIE STONE (R3DO)
ANN MARIE STONE (R3DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 100 | Power Operation | 100 | Power Operation |
CONTROL ROOM VENTILATION BOUNDARY DOOR INOPERABLE
"At 0942 on May 25, 2014, the Cook Nuclear Plant (CNP) declared both Control Room Emergency Ventilation trains inoperable in accordance with LCO 3.7.10 due to an inoperable Control Room Envelope when a control room boundary door was identified as not latching correctly during a security door check. The latch would not have been able to maintain the door closed during an event resulting in Control Room Pressurization. At this time, Security established a continuous door post and would have been able to maintain the door closed.
"At 1602 on May 25, 2014, repairs to the control room boundary door latch were completed restoring the Control Room Envelope to Operable.
"The licensee has notified the NRC Senior Resident Inspector.
"This notification should have been made within 8 hours of the event in accordance with 10 CFR 50.72 (b)(3)(v)(D) per guidance in section 3.2.7 of NUREG-1022 - Event or Condition that Could Have Prevented Fulfilment of a Safety Function, but was not recognized at that time."
* * * RETRACTION FROM PERRY GRAHAM TO JOHN SHOEMAKER AT 1443 EDT ON 6/20/14 * * *
"The purpose of this report is to retract EN #50149 (May 25, 2014). On June 19, 2014, Cook Nuclear Plant concluded that the EN could be retracted based on the completion of a Maintenance Rule Evaluation (MRE) performed by Systems Engineering.
"By design, the Control Room Envelope (CRE) pressure boundary is required to be maintained at a positive pressure during all modes of operation and during any irradiated fuel movement. New information contained in the MRE concluded the CRE function was not lost as the control room boundary door remained closed without manual assistance during normal operations. The amount of make-up air during normal operation is similar to the design flow for accident mode (approx. 800 cfm). It was concluded that the sealing integrity was not lost, thus the CRE function was maintained. The CRE would have remained operable and LCO 3.7.10 would not have been entered for the identified condition.
"The licensee has notified the NRC Senior Resident Inspector."
Notified the R3DO (Valos).
"At 0942 on May 25, 2014, the Cook Nuclear Plant (CNP) declared both Control Room Emergency Ventilation trains inoperable in accordance with LCO 3.7.10 due to an inoperable Control Room Envelope when a control room boundary door was identified as not latching correctly during a security door check. The latch would not have been able to maintain the door closed during an event resulting in Control Room Pressurization. At this time, Security established a continuous door post and would have been able to maintain the door closed.
"At 1602 on May 25, 2014, repairs to the control room boundary door latch were completed restoring the Control Room Envelope to Operable.
"The licensee has notified the NRC Senior Resident Inspector.
"This notification should have been made within 8 hours of the event in accordance with 10 CFR 50.72 (b)(3)(v)(D) per guidance in section 3.2.7 of NUREG-1022 - Event or Condition that Could Have Prevented Fulfilment of a Safety Function, but was not recognized at that time."
* * * RETRACTION FROM PERRY GRAHAM TO JOHN SHOEMAKER AT 1443 EDT ON 6/20/14 * * *
"The purpose of this report is to retract EN #50149 (May 25, 2014). On June 19, 2014, Cook Nuclear Plant concluded that the EN could be retracted based on the completion of a Maintenance Rule Evaluation (MRE) performed by Systems Engineering.
"By design, the Control Room Envelope (CRE) pressure boundary is required to be maintained at a positive pressure during all modes of operation and during any irradiated fuel movement. New information contained in the MRE concluded the CRE function was not lost as the control room boundary door remained closed without manual assistance during normal operations. The amount of make-up air during normal operation is similar to the design flow for accident mode (approx. 800 cfm). It was concluded that the sealing integrity was not lost, thus the CRE function was maintained. The CRE would have remained operable and LCO 3.7.10 would not have been entered for the identified condition.
"The licensee has notified the NRC Senior Resident Inspector."
Notified the R3DO (Valos).
Power Reactor
Event Number: 50142
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: MIKE CICCONE
HQ OPS Officer: DONALD NORWOOD
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: MIKE CICCONE
HQ OPS Officer: DONALD NORWOOD
Notification Date: 05/25/2014
Notification Time: 07:30 [ET]
Event Date: 05/25/2014
Event Time: 07:02 [EDT]
Last Update Date: 05/25/2014
Notification Time: 07:30 [ET]
Event Date: 05/25/2014
Event Time: 07:02 [EDT]
Last Update Date: 05/25/2014
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION 50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION 50.72(b)(3)(xiii) - LOSS COMM/ASMT/RESPONSE
Person (Organization):
HAROLD GRAY (R1DO)
DAVID LEW (R1DR)
ERIC LEEDS (NRR)
LAWRENCE KOKAJKO (NRR)
JEFFERY GRANT (IRD)
HAROLD GRAY (R1DO)
DAVID LEW (R1DR)
ERIC LEEDS (NRR)
LAWRENCE KOKAJKO (NRR)
JEFFERY GRANT (IRD)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
UNUSUAL EVENT DUE TO LOSS OF OFFSITE POWER
At 0702 EDT on 5/25/14, Millstone Units 2 and 3 experienced a loss of offsite power and subsequent trip of both units. An Unusual Event was declared by Millstone Units 2 and 3 at 0715 EDT.
Power is currently being supplied to all emergency busses by the emergency diesel generators. Offsite power is not available.
At this time, it appears that the loss of offsite power is due to a localized issue in the Millstone switchyard. The surrounding areas were not affected.
A decision was made to take the NRC to monitoring mode at 0749 EDT with Region 1 in the lead.
Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
* * * UPDATE FROM MICHAEL CICCONE TO CHARLES TEAL AT 1330 EDT ON 5/25/14 * * *
All EDGs have been secured and offsite power has been restored.
The licensee is reporting the loss of two stack radiation monitors - 8168 and 8169. This is reportable under 10CFR50.72(b)(3)(xiii).
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant).
* * * UPDATE FROM MICHAEL CICCONE TO DANIEL MILLS AT 1548 EDT * * *
At 1414 EDT the licensee terminated the Unusual Event.
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant), DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
At 0702 EDT on 5/25/14, Millstone Units 2 and 3 experienced a loss of offsite power and subsequent trip of both units. An Unusual Event was declared by Millstone Units 2 and 3 at 0715 EDT.
Power is currently being supplied to all emergency busses by the emergency diesel generators. Offsite power is not available.
At this time, it appears that the loss of offsite power is due to a localized issue in the Millstone switchyard. The surrounding areas were not affected.
A decision was made to take the NRC to monitoring mode at 0749 EDT with Region 1 in the lead.
Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
* * * UPDATE FROM MICHAEL CICCONE TO CHARLES TEAL AT 1330 EDT ON 5/25/14 * * *
All EDGs have been secured and offsite power has been restored.
The licensee is reporting the loss of two stack radiation monitors - 8168 and 8169. This is reportable under 10CFR50.72(b)(3)(xiii).
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant).
* * * UPDATE FROM MICHAEL CICCONE TO DANIEL MILLS AT 1548 EDT * * *
At 1414 EDT the licensee terminated the Unusual Event.
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant), DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
Power Reactor
Event Number: 50140
Facility: TURKEY POINT
Region: 2 State: FL
Unit: [] [4] []
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: JAY VAN HULZEN
HQ OPS Officer: HOWIE CROUCH
Region: 2 State: FL
Unit: [] [4] []
RX Type: [3] W-3-LP,[4] W-3-LP
NRC Notified By: JAY VAN HULZEN
HQ OPS Officer: HOWIE CROUCH
Notification Date: 05/25/2014
Notification Time: 07:37 [ET]
Event Date: 05/25/2014
Event Time: 05:36 [EDT]
Last Update Date: 05/25/2014
Notification Time: 07:37 [ET]
Event Date: 05/25/2014
Event Time: 05:36 [EDT]
Last Update Date: 05/25/2014
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
10 CFR Section:
50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL
Person (Organization):
FRANK EHRHARDT (R2DO)
FRANK EHRHARDT (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 4 | A/R | Y | 19 | Power Operation | 0 | Hot Standby |
AUTOMATIC REACTOR TRIP DUE TO TURBINE TRIP ON LOSS OF CONDENSER VACUUM
"This is an non-emergency event notification to the NRC Operations Center in accordance with 10 CFR 50.72(b)(2)(iv)(B) for a valid actuation of the reactor protection system (RPS) (four hour notification).
"On 05/25/2014 at 0536 EDT, as part of a planned maintenance outage to repair a leaking check valve inside the containment building, Unit 4 power level had been lowered to 19% reactor power for the planned opening of the reactor trip breakers. Unit 4 experienced a loss of condenser vacuum. An automatic turbine trip signal was generated which initiated a reactor trip signal. The reactor tripped as required on the automatic trip signal. Unit 4 is currently in Mode 3 and stable. The loss of vacuum is under investigation at this time. All other plant systems are working as designed."
The reactor trip was uncomplicated with no other safety system actuations. Decay heat is being removed via steam dumps to atmosphere. There is no known primary to secondary leakage. The grid is stable and Unit 4 is in its normal shutdown electrical lineup. Unit 3 was not affected and continues to operate at 100% power.
The licensee has notified the NRC Resident Inspector.
"This is an non-emergency event notification to the NRC Operations Center in accordance with 10 CFR 50.72(b)(2)(iv)(B) for a valid actuation of the reactor protection system (RPS) (four hour notification).
"On 05/25/2014 at 0536 EDT, as part of a planned maintenance outage to repair a leaking check valve inside the containment building, Unit 4 power level had been lowered to 19% reactor power for the planned opening of the reactor trip breakers. Unit 4 experienced a loss of condenser vacuum. An automatic turbine trip signal was generated which initiated a reactor trip signal. The reactor tripped as required on the automatic trip signal. Unit 4 is currently in Mode 3 and stable. The loss of vacuum is under investigation at this time. All other plant systems are working as designed."
The reactor trip was uncomplicated with no other safety system actuations. Decay heat is being removed via steam dumps to atmosphere. There is no known primary to secondary leakage. The grid is stable and Unit 4 is in its normal shutdown electrical lineup. Unit 3 was not affected and continues to operate at 100% power.
The licensee has notified the NRC Resident Inspector.
Power Reactor
Event Number: 50141
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [] [3]
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: MICHAEL FORTNER
HQ OPS Officer: DONALD NORWOOD
Region: 1 State: CT
Unit: [] [] [3]
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: MICHAEL FORTNER
HQ OPS Officer: DONALD NORWOOD
Notification Date: 05/25/2014
Notification Time: 07:30 [ET]
Event Date: 05/25/2014
Event Time: 07:02 [EDT]
Last Update Date: 05/25/2014
Notification Time: 07:30 [ET]
Event Date: 05/25/2014
Event Time: 07:02 [EDT]
Last Update Date: 05/25/2014
Emergency Class: UNUSUAL EVENT
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
10 CFR Section:
50.72(a) (1) (i) - EMERGENCY DECLARED 50.72(b)(2)(iv)(B) - RPS ACTUATION - CRITICAL 50.72(b)(3)(iv)(A) - VALID SPECIF SYS ACTUATION
Person (Organization):
HAROLD GRAY (R1DO)
DAVE LEW (R1DR)
ERIC LEEDS (NRR)
LAWRENCE KOKAJKO (NRR)
JEFFERY GRANT (IRD)
HAROLD GRAY (R1DO)
DAVE LEW (R1DR)
ERIC LEEDS (NRR)
LAWRENCE KOKAJKO (NRR)
JEFFERY GRANT (IRD)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 3 | A/R | Y | 100 | Power Operation | 0 | Hot Standby |
UNUSUAL EVENT DUE TO LOSS OF OFFSITE POWER
At 0702 EDT on 5/25/14, Millstone Units 2 and 3 experienced a loss of offsite power and subsequent trip of both units. An Unusual Event was declared by Millstone Units 2 and 3 at 0715 EDT.
Power is currently being supplied to all emergency busses by the emergency diesel generators. Offsite power is not available.
At this time, it appears that the loss of offsite power is due to a localized issue in the Millstone switchyard. The surrounding areas were not affected.
A decision was made to take the NRC to monitoring mode at 0749 EDT with Region 1 in the lead.
Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
* * * UPDATE FROM MICHAEL CICCONE TO DANIEL MILLS AT 1330 EDT * * *
"The loss of offsite power was due to one main line coming into the plant shorting to ground. Emergency plan procedures have been implemented, natural circulation has been established, and the plant is stable. Offsite electrical power has been restored to both Unit 2 and Unit 3. Emergency diesel generators have been secured, and plant equipment has been restored to a normal line up.
"Extended loss of instrument air following the loss of offsite power complicated the recovery actions. The normal reactor coolant system letdown flow path was not able to be established. This resulted in the rupture of the pressurizer relief tank rupture disk inside containment. The relief valve on the volume control tank lifted when restoring normal letdown. This caused the primary drains transfer tank to overflow into the auxiliary building. This overflow path has been isolated. Supplementary leakage collection system radiation monitor HVR-RE19B, and auxiliary building normal ventilation radiation monitor HVR-RE10B, are indicating normal levels."
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant).
* * * UPDATE FROM MICHAEL CICCONE TO DANIEL MILLS AT 1548 EDT * * *
At 1414 EDT the licensee terminated the Unusual Event.
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant), DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
At 0702 EDT on 5/25/14, Millstone Units 2 and 3 experienced a loss of offsite power and subsequent trip of both units. An Unusual Event was declared by Millstone Units 2 and 3 at 0715 EDT.
Power is currently being supplied to all emergency busses by the emergency diesel generators. Offsite power is not available.
At this time, it appears that the loss of offsite power is due to a localized issue in the Millstone switchyard. The surrounding areas were not affected.
A decision was made to take the NRC to monitoring mode at 0749 EDT with Region 1 in the lead.
Notified DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.
* * * UPDATE FROM MICHAEL CICCONE TO DANIEL MILLS AT 1330 EDT * * *
"The loss of offsite power was due to one main line coming into the plant shorting to ground. Emergency plan procedures have been implemented, natural circulation has been established, and the plant is stable. Offsite electrical power has been restored to both Unit 2 and Unit 3. Emergency diesel generators have been secured, and plant equipment has been restored to a normal line up.
"Extended loss of instrument air following the loss of offsite power complicated the recovery actions. The normal reactor coolant system letdown flow path was not able to be established. This resulted in the rupture of the pressurizer relief tank rupture disk inside containment. The relief valve on the volume control tank lifted when restoring normal letdown. This caused the primary drains transfer tank to overflow into the auxiliary building. This overflow path has been isolated. Supplementary leakage collection system radiation monitor HVR-RE19B, and auxiliary building normal ventilation radiation monitor HVR-RE10B, are indicating normal levels."
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant).
* * * UPDATE FROM MICHAEL CICCONE TO DANIEL MILLS AT 1548 EDT * * *
At 1414 EDT the licensee terminated the Unusual Event.
Notified R1DO (Gray), R1DRA (Lew), NRR EO (Kokajko), IRD MOC (Grant), DHS SWO, FEMA Ops Center, NICC Watch Officer, DOE Ops Center, USDA Ops Center, HHS Ops Center, and Nuclear SSA via email.