몬테칼로 방법을 이용한 초소형 이동형 원자로의 외부 차폐벽의 물질에 따른 방사선영향 평가

Abstract

A transportable micro reactor is a type of reactor that can move to the location where power is neededbased on demand.A shield that requires significant construction time and expenses, like a concrete containmentbuilding, might not be appropriate if it is expected that the external shield will be moved and operated for a shortperiod of time before being re-operated at a different location. This is why a radiation impact assessment must bedone when using a single material as a shielding wall. A transportable molten salt reactor under development wasselected as a reference system for the single material shielding study. The initial reactivity value of the designedtransportable micro reactor was estimated to be around 1.0577, and the error was calculated to be 0.00071. Accordingto the 1 m shielding wall investigation, earth and sand performed poorly in terms of neutron shielding. The othermaterials - concrete, rock and water - exhibited below normal background level doses, suggesting that they maybe used as shielding walls. There are significant differences in gamma shielding between materials. This is due tothe fact that gamma shielding has a density-dependent shielding capacity. A series of dose calculations outside theshielding wall generated a bounding line that indicate the point at which the radiation fell below the normal levelof 0.1 μSvh-1. Water is the shielding material that needs the greatest distance from the shielding wall, requiring adistance of 12.24 meters, while rock requires the least distance, 5.4 meters. Rock will therefore be the best material ifshielding is thought of utilizing single material.