Cross-scale neutronic-thermal-material coupling simulation method for pressurized water reactor corrosion-related unidentified deposits (crud)

A cross-scale neutronic-thermal-material coupled simulation method for CRUD in a pressurized water reactor (PWR), characterized by:

• in the first stage, cyclic iterative simulations are performed using a neutronics model and a thermal-hydraulic model to obtain the subcooled nucleate boiling condition;
• in the second stage, multiphysics coupled simulations are performed using the CRUD model, the neutronics model, and the thermal-hydraulic model to obtain a high-resolution simulation under PWR neutronic-thermal-material coupled conditions;
• and the multiphysics coupling simulation refers to:
• maintaining the subcooled nucleate boiling condition unchanged, calculating the temperature, density, and thermal conductivity of the CRUD region using the CRUD model, and continuing the iterative process, that is, the thermal-hydraulic model calculates based on the temperature, density, and thermal conductivity output by the CRUD model, and the neutronics model updates its database and performs calculations based on the temperature and density results of the thermal-hydraulic model and the CRUD model;
• and the CRUD model includes:
• a CRUD deposition model, a CRUD chemical component model and a CRUD thermal conductivity model.