Patent Number: 
Section: claims

1. A power module comprising:a reactor core having horizontal and vertical surfaces; anda reflector partially surrounding the vertical surfaces of the reactor core to improve a neutron efficiency of the power module, wherein the reflector comprises one or more inlets located in the vertical surfaces adjacent the reactor core, and wherein the one or more inlets are configured to receive coolant that has passed through at least a portion of the reactor core prior to entering the one or more inlets, and whereinthe reflector comprises a plurality of horizontal plates, and wherein the horizontal plates adjacent a bottom portion of the reflector are thinner than the horizontal plates adjacent a top portion of the reflector. 2. The power module according to claim 1, wherein the one or more inlets comprises a plurality of inlets, and the reflector further comprises a plurality of outlets located at an upper end of the reflector, and wherein each inlet of the plurality of inlets is connected to a corresponding outlet of the plurality of outlets, the inlet and the corresponding outlet being coupled by a channel that passes through the reflector. 3. The power module according to claim 2, wherein a portion of the channel coupled to the inlet is oriented in an approximately horizontal direction. 4. The power module according to claim 3, wherein a portion of the channel connected to the corresponding outlet is oriented in an approximately vertical direction. 5. The power module according to claim 1, further comprising a reactor housing that surrounds the reactor core about its sides to direct the coolant through the reactor core, wherein the reflector is located between the reactor housing and the reactor core. 6. The power module according to claim 1, wherein the one or more inlets comprise a plurality of inlets located at different elevations. 7. The power module according to claim 6, wherein a first inlet located at a lower elevation is configured to receive coolant that passes through a lower portion of the reactor core, and wherein a second inlet located at a higher elevation is configured to receive coolant that passes through an upper portion of the reactor core. 8. A nuclear reactor module comprising:a reactor core;a reactor housing that surrounds the reactor core about the sides of the reactor core, wherein the reactor housing is configured to direct coolant through the reactor core; anda neutron reflector located between the reactor core and the reactor housing, wherein the neutron reflector includes a plurality of inlet ports facing the reactor core, and wherein the neutron reflector further includes a plurality of outlet ports fluidly connected to the inlet ports to direct a portion of the coolant through the neutron reflector, whereinthe neutron reflector comprises a plurality of plates layered together, wherein a channel is formed between adjacent plates of the neutron reflector, and wherein the channel fluidly connects an inlet port to an outlet port, andwherein at least some of the plurality of plates have different thicknesses, and wherein distance between inlet ports increases adjacent a top portion of the reflector and decreases adjacent a bottom portion of the reflector. 9. The nuclear reactor module according to claim 8, wherein the channel comprises an approximately horizontal channel that passes between the adjacent plates. 10. The nuclear reactor module according to claim 9, wherein the channel comprises an upper portion that is recessed into a lower surface of a first plate, wherein the channel comprises a lower portion that is bounded by an upper surface of a second plate, and wherein the lower surface of the first plate is located adjacent to the upper surface of the second plate. 11. The nuclear reactor module according to claim 9, wherein the approximately horizontal channel is connected to an approximately vertical channel that passes through two or more of the plurality of plates. 12. The nuclear reactor module according to claim 11, wherein the horizontal channel is connected to one of the inlet ports, and wherein the vertical channel is connected to one of the outlet ports. 13. The nuclear reactor module according to claim 8, wherein the number of channels comprises one or more sloped channels. 14. The nuclear reactor module according to claim 8, wherein at least some of the plurality of plates have different thicknesses, and wherein a distance between inlet ports varies according to the different thicknesses of the plurality of plates. 15. A power module comprising:a reactor core comprising a lateral surface, a first end surface, a second end surface, and a flow path defined between and through the first and second end surfaces; anda reflector at least partially surrounding the lateral surface of the reactor core and comprising at least two fluid circuits defined through the reflector, at least one of the fluid circuits comprising a portion that is transverse to the flow path, the at least two fluid circuits fluidly coupled between a portion of the flow path between the first and second end surfaces of the reactor core and a portion of the flow path that exits the reactor core at the second end surface of the reactor core. 16. The power module of claim 15, wherein the portion of the at least one fluid circuit comprises a first portion substantially perpendicular to the flow path, and the at least one fluid circuit further comprises a second portion substantially parallel to the flow path and fluidly coupled to the first portion of the fluid circuit. 17. The power module of claim 16, wherein the first portion is fluidly coupled to the portion of the flow path between the first and second end surfaces of the reactor core, and the second portion is fluid coupled to the portion of the flow path exiting the reactor core at the second end surface of the reactor core. 18. The power module of claim 16, wherein the reflector comprises a plurality of plates layered together, and substantially all of the first portion of the fluid circuit is defined through only one of the plurality of plates, and substantially all of the second portion of the fluid circuit is defined transversely through two or more of the plurality of plates. 19. The power module of claim 18, wherein one or more plates of the plurality of plates adjacent a bottom portion of the reflector is thinner than one or more plates of the plurality of plates adjacent a top portion of the reflector. 20. The power module according to claim 15, wherein the reflector further comprises a substantially vertical channel extending between a lower end surface of the reflector that is substantially coplanar with the first end surface of the reactor core and an upper end surface of the reflector that is substantially coplanar with the second end surface of the reactor core. 21. The power module according to claim 20, wherein the two or more fluid circuits defined through the reflector are fluidly decoupled from the substantially vertical channel. 22. The power module according to claim 15, further comprising a reactor housing that surrounds the reflector.