Implementation and Verification of the DAGMC Module in Monte Carlo Code RMC

Abstract

Abstract The ability to perform shielding simulations is one of the advantages of Monte Carlo codes. However, the shielding structure of an advanced nuclear reactor or other facilities is usually designed in CAD geometry and cannot be easily transformed into CSG geometry. Thus, the research for performing shielding simulations in CAD models in Monte Carlo codes is of significant importance. DAGMC is an advanced toolkit used to simulate the Monte Carlo particle transport process in CAD models. Based on the RMC (V3.5) code developed by the REAL lab of the Department of Engineering Physics of Tsinghua University, this paper implemented the DAGMC module to enhance the ability to handle CAD models. The implementation scheme supports weight window parameters and cell importance parameters’ definition to carry out shielding simulations in CAD models. We have done an extensive investigation on various problems to exemplify its validity. In the CAD-based deep penetration calculations, the adaptive variance reduction (AVR) method is adopted and improves the FOM by 601 and 207 times for single and multiple material problems.