CORE SIM+: A flexible diffusion-based solver for neutron noise simulations

• A new flexible diffusion-based solver for neutron noise simulations is presented The features of the allow simulation a broad range sources Complete databases can be built via method Green’s function code verified and validation efforts based on experiments are ongoing Realistic fuel assembly core barrel vibrations paper presents CORE SIM+, tool developed simulations. simulator 3-dimensional, two-energy group diffusion equation in frequency domain. includes necessary solvers to calculate criticality problems associated with system then response variety perturbations such as absorbers variable strength, travelling coolant flow components. Numerical methods suitable different types have been implemented. capability that allows apply non-uniform computational meshes available so discretization domain optimized respect characteristics sources. generate nuclear power reactors fully automated manner. These useful when studying reactor training machine learning algorithms monitoring diagnostics. As part verification process, SIM+ realistic model given perturbation at various frequencies used estimate corresponding point-kinetic component, compared an exact analytical expression. In addition, generator cell vibration. solution one direct SIM+. work, experiment rods simulated, showing reasonable agreement measurements. representative database generated generic pressurized water described. From chosen illustrative examples demonstrating capabilities tool.