Passive buoyancy driven fluid system

A system comprising

• a reactor vessel defining an internal volume and comprising a downcomer therein, the downcomer segmenting the internal volume between a reactor core zone and a periphery zone, wherein the periphery zone includes at least one molten salt fuel inlet, and wherein the reactor core zone includes at least one molten salt fuel outlet fluidically coupled to the at least one molten salt fuel inlet;
• and
• a reactor core seated in the reactor core zone, the reactor core defining a plurality of flow channels therethrough along a molten fuel salt flow path between the at least one molten fuel salt inlet and the at least one molten fuel salt outlet,
• wherein the system is operable to cause a flow of a molten fuel salt along the molten fuel salt flow path free from active pumping inside the internal volume.

A system comprising

• a nuclear reactor core, the nuclear reactor core defining a plurality of flow channels therethrough, the nuclear reactor core configured to control fission reactions of a fuel salt circulating through, collectively, the plurality of flow channels;
• a first primary heat exchanger fluidically coupled with the nuclear reactor core and defining a first fuel salt circuit with the plurality of flow channels;
• and
• a second primary heat exchanger fluidically coupled with the nuclear reactor core and defining a second fuel salt circuit with the plurality of flow channels,
• wherein the first fuel salt circuit and the second fuel salt circuit combine within the nuclear core to define a common circulating flow up through the plurality of flow channels.

A system comprising

• a reactor vessel defining an internal volume and comprising a downcomer therein, the downcomer segmenting the internal volume between a reactor core zone and a periphery zone,
• wherein the periphery zones includes
• a first molten fuel salt inlet, and
• a second molten salt inlet,
• wherein the reactor core zone includes
• a first molten salt outlet, the first molten salt outlet defines a vessel leg of a first fuel salt circuit with the first molten salt inlet and a first primary heat exchanger fluidically coupled with the internal volume, and
• a second molten salt outlet, the second molten salt outlet defines a vessel leg of a second fuel salt circuit with the second molten salt outlet and a second primary heat exchanger fluidically coupled with the internal volume, and
• wherein the leg of the first fuel salt circuit and the leg of the second fuel salt circuit combine within the reactor core zone to define a common circulating flow up through the reactor zone within which fission reactions of a circulating fuel salt occur.