Patent ID: 8687759
Filing Date: 2014-04-01
Classification: G21C,Y02E

Abstract:
1. A power module assembly comprising: a reactor core immersed in a primary coolant; a reactor vessel housing the primary coolant and the reactor core, wherein an inner surface of the reactor vessel is exposed directly to the primary coolant during normal operation of the power module assembly; an internal dry containment vessel in direct contact with and completely submerged in liquid, wherein the containment vessel substantially surrounds the reactor vessel in a below atmospheric pressure condition, wherein an outer surface of the reactor vessel is exposed directly to the below atmospheric pressure condition during the normal operation of the power module assembly, and wherein the containment vessel is configured to prohibit a release of the primary coolant out of the containment vessel; and a vent configured to controllably release the primary coolant into the containment vessel as primarily steam during an over-pressurization event.