A power module (25)includes a containment vessel (24)completely submerged in a pool ofliquid, and a support structure (20)located at or above an approximatemidpoint of the containment vessel,or center of gravity of the powermodule (25). The power module (25) issupported by the support structure(20) in combination with a buoyancyforce of the pool of liquid acting onthe containment vessel (24).
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