Numerical modeling of an in-vessel flow limiter using an immersed boundary approach

This work is in the context of the mitigation of the consequences of a large-break loss of coolant accident in a pressurized water reactor. To minimize the flow leaving the vessel and prevent or delay the uncovering of the core, CEA has devised a device, named in-vessel flow limiter, limiting the flow of fluid from the vessel to the break. The goal is to interfere as little as possible with the nominal operation flow and maximize the fluid retained in the event of this kind of accident.