Melcor accident analysis for aries-act

We model a loss of flow accident (LOFA) in the ARIES-ACTl tokamak design. ARIES-ACTl features an advanced SiC blanket with LiPb as coolant and breeder, a helium cooled steel structural ring and tungsten divert ors, a thin-walled, helium cooled vacuum vessel, and a room temperature water-cooled shield outside the vacuum vessel. The water heat transfer system is designed to remove heat by natural circulation during a LOFA. The MELCOR model uses time-dependent decay heats for each component determined by 1-D modeling. The MELCOR model shows that, despite periodic boiling of the water coolant, that structures are kept adequately cool by the passive safety system.