Molten fuel reactors and orifice ring plates for molten fuel reactors

1. A molten fuel reactor comprising:

a reactor core defined at least partially by an upper reflector, a lower reflector, and at least one side reflector, wherein the reactor core is substantially a right-circular cylinder shape, and wherein the reactor core has a longitudinal axis and an inner diameter;

at least one inlet configured to channel fuel salt into the reactor core;

at least one outlet configured to channel fuel salt out of the reactor core, wherein the at least one inlet and the at least one outlet at least partially define a flow loop of fuel salt with respect to the reactor core; and

an orifice ring plate disposed within the reactor core and proximate the at least one inlet, wherein the orifice ring plate is configured to condition a flow of fuel salt entering the reactor core from the at least one inlet, wherein the orifice ring plate extends circumferentially about the longitudinal axis and has a height defined in a direction along the longitudinal axis, and wherein the orifice ring plate includes a plurality of apertures configured to allow the flow of fuel salt therethrough.

2. The molten fuel reactor of claim 1 , wherein the orifice ring plate has an inner surface that is aligned with the inner diameter of the reactor core.

3. The molten fuel reactor of claim 1 , wherein the at least one inlet includes a first inlet and a second inlet, wherein a gap is formed upstream of the orifice ring plate such that the first inlet and the second inlet are in flow communication.

4. The molten fuel reactor of claim 1 , wherein the at least one inlet has a height defined in the longitudinal axis direction, and wherein the height of the orifice ring plate is approximately equal to the height of the at least one inlet.

5. The molten fuel reactor of claim 1 , wherein the at least one side reflector has an inside corner that at least partially separates the reactor core and the at least one inlet, and wherein the inside corner is at least partially rounded.

6. The molten fuel reactor of claim 5 , wherein the at least one inlet has a height defined in the longitudinal axis direction, and wherein a radius of the inside corner is greater than or equal to one-third of the height of the at least one inlet.

7. The molten fuel reactor of claim 1 , wherein the orifice ring plate includes a top end and a bottom end, wherein the top end has a solid portion such that the plurality of apertures are offset from the top end of the orifice ring plate.

8. The molten fuel reactor of claim 1 , wherein the orifice ring plate includes a top end and a bottom end, wherein one or more of the plurality of apertures are partially defined in the bottom end.

9. The molten fuel reactor of claim 8 , wherein the bottom end is offset from the lower reflector.

10. The molten fuel reactor of claim 1 , wherein the at least one inlet is adjacent the upper reflector.

11. A molten fuel reactor comprising:

an upper reflector;

a lower reflector;

at least one radial reflector extending between the upper reflector and the lower reflector;

a reactor core defined at least partially by the upper reflector, the lower reflector, and the at least one radial reflector, wherein the reactor core defines a longitudinal axis substantially parallel to the at least one radial reflector;

a plurality of radial inlets adjacent the lower reflector and circumferentially spaced about the longitudinal axis;

a plurality of radial outlets adjacent the upper reflector and circumferentially spaced about the longitudinal axis, wherein a flow loop of fuel salt is defined through the reactor core with respect to the plurality of radial inlets and the plurality of radial outlets; and

a circumferential orifice ring plate disposed within the reactor core and proximate the plurality of radial inlets, wherein the orifice ring plate includes a plurality of radial apertures, and wherein a flow of fuel salt exiting the plurality of radial inlets flows above the orifice ring plate, through the plurality of radial apertures, and below the orifice ring plate to enter the reactor core.

12. The molten fuel reactor of claim 11 , wherein the orifice ring plate has an outer diameter that is greater than an inner diameter of the reactor core.

13. The molten fuel reactor of claim 11 , wherein a radial gap is formed between the orifice ring plate and the plurality of radial inlets.

14. The molten fuel reactor of claim 11 , wherein the at least one radial reflector includes a lower corner that separates the plurality of radial inlets and the reactor core, and wherein the lower corner has a curved surface.

15. The molten fuel reactor of claim 11 , wherein a height of the orifice ring plate is approximately equal to a height of the plurality of radial inlets.

16. The molten fuel reactor of claim 11 , wherein a pressure drop of the flow of fuel salt across the orifice ring plate is between about 5-10%.

17. A molten fuel reactor comprising:

a reactor core defined at least partially by an upper reflector, a lower reflector, and at least one side reflector, wherein the reactor core is substantially a right-circular cylinder shape, and wherein the reactor core has a longitudinal axis and an inner diameter defined by the at least one side reflector;

at least one inlet configured to channel fuel salt into the reactor core;

at least one outlet configured to channel fuel salt out of the reactor core, wherein the at least one inlet and the at least one outlet at least partially define a flow loop of fuel salt with respect to the reactor core; and

an orifice ring plate disposed within the reactor core and proximate the at least one inlet, wherein the orifice ring plate is configured to condition a flow of fuel salt entering the reactor core from the at least one inlet, wherein the orifice ring plate extends circumferentially about the longitudinal axis and has both a inside surface diameter and a height that is defined in a direction along the longitudinal axis, the inside surface diameter being equal to the inner diameter of the reactor core, and wherein the orifice ring plate includes a plurality of apertures configured to allow the flow of fuel salt therethrough.