Patent Number: 
Section: claims

1. A power module comprising:a containment vessel completely submerged in a pool of liquid;a reactor vessel housed in the containment vessel; anda support structure that comprises support arms coupled to opposed sides of the containment vessel, the support structure located at an approximate midpoint of the containment vessel and configured to rotate at least one of the reactor vessel or the containment vessel about an axis that extends between the support arms and through the approximate midpoint of the containment vessel, the power module supported by the support structure in combination with a buoyancy force of the pool of liquid acting on the containment vessel. 2. The power module according to claim 1, wherein the support structure is located at or slightly above the approximate center of gravity of the power module. 3. The power module according to claim 1, further comprising a first damping device interposed between the reactor vessel and the containment vessel, anda second damping device interposed between the containment vessel and a pool wall, wherein the first and second damping devices are configured to attenuate a dynamic force acting on the power module. 4. The power module according to claim 1, wherein the pool of liquid is disposed below a terranean surface. 5. The power module according to claim 1, wherein the containment vessel is configured to slide in a substantially lateral direction in response to a lateral force acting on the containment vessel. 6. The power module according to claim 1, wherein the support structure comprises a first support structure disposed on a first side of the containment vessel, andwherein the power module further comprises a second support structure disposed on a second side of the containment vessel opposite the first side. 7. The power module according to claim 1, wherein the support structure comprises an elastic damping device. 8. The power module according to claim 7, wherein the support arms are rigidly attached to the containment vessel, and wherein the elastic damping device is located between and in contact with one of the support arms and a mounting structure in the pool of liquid. 9. The power module according to claim 8, wherein the elastic damping device compresses in response to the support arm and the mounting structure being pressed together, andwherein the elastic damping device exerts a reactionary force against at least one of the support arm and the mounting structure in response to the support arm and the mounting structure being pressed together. 10. The power module according to claim 8, further comprising a pivot at an interface between the support structure and the mounting structure. 11. The power module according to claim 10, wherein the pivot is located at or near the elastic damping device, andwherein the containment vessel is configured to rotate about the pivot in response to a rotational force acting on the containment vessel. 12. The power module according to claim 8, wherein the mounting structure is rigidly coupled to a reactor bay at least partially enclosing the pool of liquid, andwherein the mounting structure extends from a substantially vertical wall of the reactor bay to a location in the pool of liquid between the substantially vertical wall and the containment vessel. 13. The power module according to claim 12, wherein the support arm comprises a hollow shaft. 14. The power module according to claim 12, wherein the mounting structure comprises a recess configured to receive a portion of the elastic damping device. 15. The power module according to claim 8, further comprising a base skirt located at a lower end of the containment vessel, wherein the containment vessel is configured to pivot about the support arm, and wherein the base skirt is configured to contact an alignment device in the pool of liquid if the containment vessel pivots about the support arm. 16. The power module according to claim 15, wherein the base skirt is rigidly coupled to the lower end of the containment vessel around a circumference of an outer surface of the containment vessel. 17. The power module according to claim 15, wherein the alignment device extends into the pool of liquid from a bottom surface of a reactor bay at least partially enclosing the pool of liquid, andwherein a top portion of the alignment devices is disposed within a volume defined by the base skirt. 18. The power module according to claim 17, further comprising at least one dampener disposed between the top portion of the alignment device and the base skirt, and within the volume of the base skirt. 19. The power module according to claim 18, wherein the dampener compresses in response to contact between the alignment device and the base skirt, andwherein the dampener exerts a reactionary force against at least one of the alignment device or the base skirt in response to the contact.