Event Notification Report for June 28, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
06/27/2015 - 06/28/2015
EVENT NUMBERS
51187
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
!!!!! THIS EVENT HAS BEEN RETRACTED !!!!!
Power Reactor
Event Number: 51187
Facility: MILLSTONE
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: MICHAEL WATSON
HQ OPS Officer: DANIEL MILLS
Region: 1 State: CT
Unit: [] [2] []
RX Type: [1] GE-3,[2] CE,[3] W-4-LP
NRC Notified By: MICHAEL WATSON
HQ OPS Officer: DANIEL MILLS
Notification Date: 06/28/2015
Notification Time: 11:24 [ET]
Event Date: 06/28/2015
Event Time: 09:00 [EDT]
Last Update Date: 07/08/2015
Notification Time: 11:24 [ET]
Event Date: 06/28/2015
Event Time: 09:00 [EDT]
Last Update Date: 07/08/2015
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):
JOHN ROGGE (R1DO)
JOHN ROGGE (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 |
CONTROL ROOM ENVIRONMENTAL BOUNDARY DOOR FOUND UNLATCHED
"During Security checks of Control Room doors, a boundary door was found not latched. This door is capable of being manually closed and latched. The door was in this condition for 4 hours and 25 minutes. The door is currently closed and latched. This is being reported as it could have prevented the fulfillment of a safety function to mitigate the consequences of an accident per 10 CFR 50.72(b)(3)(v)(D)."
The NRC Resident Inspector has been notified.
A condition report has been written and the door is posted to require manual checks to ensure it is latched until the door closing mechanism is repaired.
* * * RETRACTION FROM THOMAS CLEARY TO VINCE KLCO ON 7/8/2015 AT 1314 EDT * * *
"Event Report number 51187 describes a condition at Millstone Power Station Unit 2 (MPS2) in which a control room environmental boundary door was found unlatched. This was reported in accordance with 10CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function to mitigate the consequences of an accident.
"Upon further review, MPS2 has concluded that there was no loss of safety function, because even with the control room boundary door unlatched, the control room emergency ventilation system would have been able to perform its safety function during accident conditions. The MPS2 control room is pressure neutral and the hydraulic door closure mechanism was verified adequate to ensure the door would close and remain closed during accident conditions (even though it was not latching). Therefore, this condition is not reportable and NRC Event Number 51187 is being retracted.
"The basis for this conclusion will be provided to the NRC Resident Inspector."
Notified the R1DO (Cahill).
"During Security checks of Control Room doors, a boundary door was found not latched. This door is capable of being manually closed and latched. The door was in this condition for 4 hours and 25 minutes. The door is currently closed and latched. This is being reported as it could have prevented the fulfillment of a safety function to mitigate the consequences of an accident per 10 CFR 50.72(b)(3)(v)(D)."
The NRC Resident Inspector has been notified.
A condition report has been written and the door is posted to require manual checks to ensure it is latched until the door closing mechanism is repaired.
* * * RETRACTION FROM THOMAS CLEARY TO VINCE KLCO ON 7/8/2015 AT 1314 EDT * * *
"Event Report number 51187 describes a condition at Millstone Power Station Unit 2 (MPS2) in which a control room environmental boundary door was found unlatched. This was reported in accordance with 10CFR 50.72(b)(3)(v)(D) as a condition that could have prevented the fulfillment of a safety function to mitigate the consequences of an accident.
"Upon further review, MPS2 has concluded that there was no loss of safety function, because even with the control room boundary door unlatched, the control room emergency ventilation system would have been able to perform its safety function during accident conditions. The MPS2 control room is pressure neutral and the hydraulic door closure mechanism was verified adequate to ensure the door would close and remain closed during accident conditions (even though it was not latching). Therefore, this condition is not reportable and NRC Event Number 51187 is being retracted.
"The basis for this conclusion will be provided to the NRC Resident Inspector."
Notified the R1DO (Cahill).