To ensure reasonable design criteria of collision and grounding for the LNG tank location in small FRP LNG fueled ship, full-scale simulations would be the best approach using highly advanced Modeling & Simulation (M&S) system with Fluid-Structure Interaction (FSI) analysis technique, through the realization of several interface effects of ship in the sea water, such as its floating, motion, making wave, squeezing pressure, and bank effect, etc. Collision and grounding scenarios are set up based on the risk analysis. Fracture criterion is also updated by the verification of impact test of FRP plates using laminated shell theory and MAT_ENHANCED_COMPOSITE_DAMAGE composite material in LS-DYNA code. Full-scale vessel is modeled by investigating its hull form, general arrangement, midship section and stability calculation, by calculating its structural members according to FRP structural criterion, and by comparing its hydrostatic characteristics using floating simulation and hydrostatic characteristic program calculation with stability calculation. In this study, full-scale ship collision and grounding simulations are performed for the design criteria of small FRP LNG fueled ship’s collision and grounding, using Marine Accident Integrated Analysis System (MAIAS; highly advanced M&S system of Fluid-Structure Interaction (FSI) analysis technology).