04:05 May 12, 2019
Discovery of a Condition That Could Have Prevented Fulfillment of a Safety Function
On 5/11/19, Callaway Energy Center entered Mode 4 at 1217 [CDT]. At 2305, the door from the Auxiliary Building to the RAM Storage building was found blocked open. This door is an Auxiliary Building pressure boundary for the Emergency Exhaust system. The Emergency Exhaust system is required in Modes 1,2,3,4, and during movement of irradiated fuel assemblies in the Fuel Building. The door was being blocked open with a large ramp. This rendered the Emergency Exhaust system not capable of performing its design safety function. LCO [Limiting Conditions for Operation] 3.7.13.B was entered, and preparations to move the ramp commenced. LCO 3.7.13.B is for two Emergency Exhaust trains being inoperable due to an inoperable auxiliary building boundary. The allowed outage time is 24 hrs. to restore the boundary to Operable. The door was closed and LCO 3.7.13.B was exited at 0111 on 5/12/19.
This event is reportable per 10 CFR 50.72(b)(3)(v) for any event or condition that at the time of discovery could have prevented the fulfillment of the safety function of structures or systems that are needed to (C) control the release of radioactive material, or (D) mitigate the consequences of an accident.The NRC Senior Resident has been notified.
Missouri (NRC Region 4)
|10 CFR 50.72(b)(3)(v)(C), Loss of Safety Function - Release of Radioactive Material|
10 CFR 50.72(b)(3)(v)(D), Loss of Safety Function - Mitigate the Consequences of an Accident
|Time - Person (Reporting Time:+0.77 h0.0321 days <br />0.00458 weeks <br />0.00105 months <br />)|
04:51 May 12, 2019
|NRC Officer:||Howie Crouch|
|Last Updated:||May 12, 2019|
|54061 - NRC Website|