Development, Verification, and Application of a Multiphysics Coupled Deterministic Analysis Program for the Reactor Core

However, with the continuous improvement of computer performance and the increasing demand for higher accuracy in calculations, traditional approaches are no longer sufficient to meet the current requirements for computational performance. [Purpose]: This study aims to develop a core calculation code that employs more accurate theoretical models and a more intensive multi-physics coupling approach. [Methods]: The three-dimensional multiphysics core analysis program developed in this paper achieved coupled calculations of neutronics, thermal-hydraulics, and fuel performance through internal program coupling.

To further enhance computational accuracy, the program employed more precise calculation models. Specifically, the neutronics calculations utilized the semi-analytical nodal method, the depletion calculations adopted the microscopic depletion method, and the thermal-hydraulics calculations were based on the subchannel thermal-hydraulic model. Additionally, to improve computational efficiency, the traditional two-step method of assembly-to-core was utilized. [Results]: To verify the computational performance of the program, it was validated against actual measurement data of the domestic M310 type plant.