b'The accelerated hydrothermal dissolution of SiC was observed under active proton irradiation in simulated LWR water chemistry on CVD 3C-SiC.5.Molecular dynamic (MD)7.Experimental results suggest simulations were performedthat hydrothermal corrosion of and determined that the HSiC is preferential at the crystal-species dissociated from H 2 Olographically discontinuous molecules can break Si-C bondsboundaries having large misori-and displace Si atoms from theentation, e.g., incoherent GBs. surface, thus resulting in the localSelective corrosion at planar disorder of the surface. In additiondefects (i.e., SFs) under active to AIMD simulations, weirradiation is also likely todemonstrated that oxidation ofenhance corrosion. SiC also Si-terminated surface producesshows an accelerated corrosion motifs, like SiO(OH) 2 , which arerate and enhanced GB attacks known precursors to silica andunder higher oxygen activity silicic acid formation (examplew/wo the active irradiation due shown in Figure 2). to the already high corrosion 6.AIMD simulation indicated thatpotential induced by the consid-the radiation induced chemicalerable oxygen activity (example changes at grain boundaries couldshown in Figure 4).modify the corrosion resistance of SiC (example shown in Figure 3). Specifically, the radiation induced C-rich grain boundary regions can suppress the intergranular corro-sion. The corrosion suppression is due to extra C-C networks, which can impede the H scission reaction at the grain boundaries.2022|AFC ACCOMPLISHMENTS 65'