Patent Number: 
Section: claims

1. An apparatus, comprising:a heat pipe reactor comprising a reactor core and one or more heat exchangers positioned on one or both sides of the reactor core, whereinthe heat pipe reactor further comprising a plurality of heat pipes extending from the reactor core and out through the one or more heat exchangers, andthe reactor core being composed of one or more monolithic blocks, whereineach of the plurality of heat pipes are simply supported in the one or more heat exchangers, expanding and contracting axially, minimizing stress applied from differential thermal expansion between each of the plurality of heat pipes and the one or more heat exchangers. 2. The apparatus of claim 1, wherein each of the one or more monolithic blocks comprises a pattern of holes oriented along a length of the reactor core. 3. The apparatus of claim 2, wherein each hole of the pattern of holes house one of nuclear fuel rods or other heating elements, moderator, nuclear control rods, and the plurality of heat pipes. 4. The apparatus of claim 2, wherein the plurality of heat pipes are arranged along the perimeter of the one or more of the monolithic blocks and fuel tubes are arranged within the interior of the one or more monolithic blocks. 5. The apparatus of claim 1, wherein the plurality of heat pipes are fixed within the one or more monolithic blocks or a structural transition lens, or both, to allow the plurality of heat pipes to expand and contract with the one or more monolithic blocks or the structural transition lens, or both as the reactor core heats and cools. 6. The apparatus of claim 1, wherein the one or more heat exchangers comprises at least one decay heat exchanger, at least one primary heat exchanger, or both. 7. The apparatus of claim 2, wherein the pattern of holes are configured to allow the plurality of heat pipes to move freely in annular regions. 8. The apparatus of claim 1, wherein a first heat exchanger of the one or more heat exchangers comprises a first port and a second port, whereingas enters into the first port, and moves up through the plurality of heat pipes, and axially across the first heat exchanger, and down through the plurality of heat pipes, finally exiting out from the second port. 9. The apparatus of claim 1, wherein gas enters through a first port, traversing across the plurality of heat pipes and flowing through an annular region between the plurality of heat pipes and second heat exchanger, and out through a second port. 10. The apparatus of claim 9, wherein the second heat exchanger is placed between a first manifold and a second manifold both of which comprise a concave shape to minimize stress on walls of the second heat exchanger from internal pressure of the gas. 11. A heat pipe reactor, comprising:a heat pipe reactor comprising a reactor core and one or more heat exchangers positioned on one or both sides of the reactor core, whereinthe heat pipe reactor further comprising a plurality of heat pipes extending from the reactor core and out through the one or more heat exchangers,the plurality of heat pipes are simply supported in the one or more heat exchangers, expanding and contracting axially to minimize stress applied from differential thermal expansion,the reactor core being composed of one or more monolithic blocks, and the heat pipe reactor further comprising a structural transition lens between the reactor core and the one or more heat exchangers. 12. The heat pipe reactor of claim 11, wherein the one or more monolithic blocks comprise a pattern of holes oriented along a length of the reactor core. 13. The heat pipe reactor of claim 12, wherein the plurality of heat pipes are arranged along the perimeter of the one or more monolithic blocks and fuel tubes are arranged within the interior of the one or more monolithic blocks. 14. The heat pipe reactor of claim 12, wherein the plurality of heat pipes are fixed within the one or more monolithic blocks or the structural transition lens, or both, to allow the plurality of heat pipes to expand and contract with the one or more monolithic blocks or the structural transition lens, or both as the reactor core heats and cools. 15. The heat pipe reactor of claim 14, wherein the pattern of holes are configured to allow the plurality of heat pipes to move freely in annular regions.