Research on Conversion of 3D CAD Model Into Monte Carlo Models Based on SALOME

In nuclear reactor design analysis, Monte Carlo (MC) programs are widely used for simulation calculations of particle transport. Traditionally, MC program input files are constructed by manual creation, but with the increasing complexity of advanced nuclear reactor models, the traditional input file construction method can no longer meet the application requirements, and it is important to develop an auxiliary modeling program for MC programs. In this paper, based on the open source platform SALOME, we conducted a study on the conversion of CAD 3D geometric model to MC computational model using decomposition-based BREP-CSG conversion algorithm and cavity generation algorithm, and developed an auxiliary modeling program MOSRT. Based on the MOSRT program, the user can create or import CAD 3D geometry models and convert them into MC program input files corresponding to the geometry through the program. To verify the effectiveness of the MOSRT program model conversion function, the NEA published benchmark example C5G7 model and the critical experimental device model were used for geometric verification. The results show that the MOSRT program developed based on the method of this paper can accurately convert the CAD 3D geometric model into the corresponding MC program calculation model, which verifies the correctness and reliability of the methods and program of this paper.