Event Notification Report for November 10, 2015
U.S. Nuclear Regulatory Commission
Operations Center
EVENT REPORTS FOR
11/09/2015 - 11/10/2015
EVENT NUMBERS
51527
Power Reactor
Event Number: 51527
Facility: SEQUOYAH
Region: 2 State: TN
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: CLAY CAMENISCH
HQ OPS Officer: DANIEL MILLS
Region: 2 State: TN
Unit: [] [2] []
RX Type: [1] W-4-LP,[2] W-4-LP
NRC Notified By: CLAY CAMENISCH
HQ OPS Officer: DANIEL MILLS
Notification Date: 11/10/2015
Notification Time: 20:13 [ET]
Event Date: 11/10/2015
Event Time: 15:02 [EST]
Last Update Date: 11/10/2015
Notification Time: 20:13 [ET]
Event Date: 11/10/2015
Event Time: 15:02 [EST]
Last Update Date: 11/10/2015
Emergency Class: NON EMERGENCY
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
10 CFR Section:
50.72(b)(3)(v)(B) - POT RHR INOP 50.72(b)(3)(v)(D) - ACCIDENT MITIGATION 50.72(b)(3)(ii)(B) - UNANALYZED CONDITION
Person (Organization):
FRANK EHRHARDT (R2DO)
FRANK EHRHARDT (R2DO)
| Unit | SCRAM Code | RX Crit | Initial PWR | Initial RX Mode | Current PWR | Current RX Mode |
|---|---|---|---|---|---|---|
| 2 | N | Y | 81 | Power Operation | 81 | Power Operation |
UNANALYZED CONDITION DUE TO DEBRIS DROPPED INTO REACTOR CAVITY EQUIPMENT PIT
"On 11/10/2015 at 1502 [EST], Unit 2 MCR [main control room] was notified by workers in containment that 2 ice suits had been dropped into the Unit 2 Containment Reactor Cavity Equipment Pit. Based upon size and location of the dropped suits, Unit 2 entered LCO 3.6.15 (Containment Recirculation Drains) Condition B and LCO 3.0.3 for refueling canal drains being inoperable. The two refueling canal drains and the ice condenser drains function with the ice bed, Containment Spray System and ECCS to limit the pressure and temperature that could be expected following a DBA [Design Basis Accident]. Following performance of a Safety Function Determination it was determined that, during the short duration when both coats were in the process of being retrieved, they could have potentially clogged the drains and prevented the fulfillment of safety functions if there was a DBA. Both suits were retrieved from the equipment pit by 1556 [EST] and all LCO conditions were exited."
The licensee notified the NRC Resident Inspector.
"On 11/10/2015 at 1502 [EST], Unit 2 MCR [main control room] was notified by workers in containment that 2 ice suits had been dropped into the Unit 2 Containment Reactor Cavity Equipment Pit. Based upon size and location of the dropped suits, Unit 2 entered LCO 3.6.15 (Containment Recirculation Drains) Condition B and LCO 3.0.3 for refueling canal drains being inoperable. The two refueling canal drains and the ice condenser drains function with the ice bed, Containment Spray System and ECCS to limit the pressure and temperature that could be expected following a DBA [Design Basis Accident]. Following performance of a Safety Function Determination it was determined that, during the short duration when both coats were in the process of being retrieved, they could have potentially clogged the drains and prevented the fulfillment of safety functions if there was a DBA. Both suits were retrieved from the equipment pit by 1556 [EST] and all LCO conditions were exited."
The licensee notified the NRC Resident Inspector.