Shielding effects of reinforcement structure and heat transfer fin in the OASIS-32D cask

Heat Transfer Fin (HTF) is a component embedded in the neutron shield outside of cask shell for heat removal from inside to cask surface. Both components have discontinuity in shielding point of view, axial in RS and azimuthal in HTF. The shielding effects of RS and HTF have been examined in this paper by using MAVRIC module of SCALE 6.1 code. MAVRIC is a 3-dimensional Monte Carlo particle transport code with automated variance reduction using importance calculations by deterministic method to enhance calculation efficiency. The analyses performed on shielding effects of RS and HTF showed that the straight HTF is more effective on the shielding point of view than the bent HTF. Also, the straight shape HTF is known as more efficient on heat transfer point of view than the bent shape. Therefore, it is recommended that the HTF of the OASIS-32D cask be designed in a straight shape