Development of JAEA Advanced Multi-Physics Analysis Platform for Nuclear Systems

Abstract

Abstract JAEA (Japan Atomic Energy Agency) Advanced Multi-Physics Analysis platform for Nuclear systems (JAMPAN) has been developed for high-fidelity multi-physics simulation. This platform has good extensibility and modularity, enabling us to consider multi-physics and -scale phenomena in a nuclear power plant by combining various simulation codes. JAMPAN consists of a data container and physics components. The physics components can be freely connected and disconnected from the data container and contain common modules. Owing to the common modules, additional modules for an independent analysis code are only required when this code is added. This paper presents an overview of JAMPAN and the numerical simulation results of a neutronics and thermal-hydraulics coupling simulation by JAMPAN. Reference solutions derived from a high-fidelity simulation are required to validate the reactor analysis codes; hence, codes without empirical correlations are required. As the first platform examination, the neutronics and thermal-hydraulics coupling simulation for a 4 × 4 fuel bundle system is conducted using JAMPAN. Consequently, the detailed power distribution of fuel rods, which varies along with the complex two-phase flow, could be acquired through the high-fidelity neutronics and thermal-hydraulics coupling simulation using JAMPAN.