Patent Number: 
Section: claims

1. A molten chloride fast reactor (MCFR) comprising:a plurality of reflectors defining a central core, wherein the central core includes a first end, an opposite second end, and a core geometric center disposed therebetween;a flow channel fluidically connected to the central core, wherein the flow channel includes an outlet flow channel positioned proximate the second end of the central core and an inlet flow channel positioned proximate the first end of the central core;a primary heat exchanger (PHX) disposed outside the central core and within the flow channel between the outlet flow channel and the inlet flow channel;a pump disposed within the flow channel between the PHX and the outlet flow channel; anda decay heat heat exchanger (DHHX) disposed within the flow channel between the outlet flow channel and the pump, wherein at least a portion of the DHHX is disposed above the core geometric center, and wherein a fuel salt is configured to circulate via the pump at least partially through the outlet flow channel, the DHHX, the PHX, the inlet flow channel, and the central core in a direction such that at the first end of the central core the fuel salt has a lower temperature than the fuel salt at the second end of the central core. 2. The MCFR of claim 1 wherein a flow direction of the fuel salt through the DHHX is different than a flow direction of the fuel salt through the pump. 3. The MCFR of claim 1, further comprising a flow conditioner disposed at least partially in the outlet flow channel. 4. The MCFR of claim 3, wherein the DHHX includes the flow conditioner. 5. The MCFR of claim 1, wherein the DHHX includes a shell and a plurality of tubes. 6. The MCFR of claim 5, wherein one or more of the plurality of tubes extend horizontally through the shell and angled downwardly relative to horizontal. 7. The MCFR of claim 1, further comprising a cooling circuit including the DHHX, wherein a coolant fluid is configured to circulate through the cooling circuit and remove heat from the fuel salt. 8. The MCFR of claim 7, wherein the cooling circuit is devoid of a circulating pump. 9. The MCFR of claim 7, wherein a flow of the coolant fluid through the DHHX is substantially orthogonal to a flow of the fuel salt through the DHHX. 10. The MCFR of claim 7, wherein the cooling circuit is a first cooling circuit, and further comprising a second cooling circuit including the PHX, wherein the first cooling circuit is independent from the second cooling circuit. 11. A molten chloride fast reactor (MCFR) comprising:a vessel including a plurality of structures disposed therein and defining at least one flow channel for circulating fuel salt within the vessel;a core geometric center defined within the vessel, wherein the circulating fuel salt is configured to pass through the core geometric center;a primary heat exchanger (PHX) disposed within the vessel and within the at least one flow channel, wherein the PHX is oriented within the vessel such that the fuel salt flows along a vertical direction within the vessel through the PHX; anda decay heat heat exchanger (DHHX) disposed within the vessel and within the at least one flow channel, wherein the DHHX is positioned at least partially above the core geometric center, and wherein the DHHX is oriented within the vessel such that the fuel salt flows along a horizontal direction within the vessel through the DHHX. 12. The MCFR of claim 11, wherein the DHHX is coupled in flow communication to at least one cooling circuit that removes heat from the fuel salt. 13. The MCFR of claim 11, wherein the DHHX is disposed between the core geometric center and the PHX within the at least one flow channel.