A passive decay heat removal system for emergency draining tanks of molten salt reactors

•A new passive decay heat removal system has been invented for molten salt reactor emergency draining tank system.•This system is based on the loop heat pipe concept.•It includes an evaporating tank (emergency draining tank), and where the liquid fuel is mixed with a working fluid (sodium) and to vaporizes the working fluid.•The resulting vapor pressure drives the vapor through the pipes to the condensers, where the vapor condenses, releasing its latent heat of vaporization to a provided heat sink.•The condensers are located above the emergency draining tank at a higher elevation than the vaporization tank, so the condensed working fluid can flow back to the emergency draining tank by gravitational force.•Therefore, the system can continuously and passively transport the latent heat of vaporization from the emergency draining tank to the condenser section.