Simulation and Analysis of the Multi-cabin Airborne Radioactivity Transport during LOCA of the Floating Reactor
Due to the special operating environment,floating reactors are prone to accidents.After the accident,the airborne radioactivity will be transferred between compartments and affect the habitability.In order to analyze the transfer process of the airborne radioactivity between compartments after the accident and control it,the transport of the airborne radioactivity from the reactor compartment to the adjacent compartment during LOCA were carried out by using the computational fluid dynamics method,and the control effect of adopting reactor cabin ventilation and engine room ventilation is analyzed.The results show that:after the loss of coolant accident of the reactor compartment,the airborne radioactivity enters the engine compartment through the leakage hole of the shielding wall,and the local concentration is different;the ventilation system forms a local circulating flow in the cabin,which makes the airborne radioactivity converges into the mainstream and discharge from the cabin through the exhaust port.The circulating flow of the reactor cabin forms an air curtain between the pressure vessel and the leakage port to prevent the transport of the airborne radioactivity;the circulating flow of the engine room will generate a speed directed towards the engine room at the engine room side of the leakage opening,enhancing the transport of the airborne radioactivity to the engine room.When the ventilation mode of the reactor cabin and the engine room is adopted simultaneously,the airborne radioactivity concentration in the engine room can be reduced by 92.5%compared with that without ventilation when the ventilation time reaches 180 s.
LOCA of floating reactorComputational fluid dynamicsElaborate simulationAirborne radioactiveMulti-cabin transport
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