Multi-fidelity Mechanical Model Matching and Updating of Primary Loop Supporting Structure

The design of reactor primary loop support should meet the vibration reduction and anti-shock requirements. Accordingly, mechanical models with different fidelity should be established. This paper first adopted correlation analysis to quantify the compatibility of static and dynamical characters of multi-fidelity mechanical models (including high-fidelity and low-fidelity models) of the reactor and primary loop supporting structure. Then, Bayesian parameter estimation technique was applied to update the low-fidelity model (simplified model) to increase its compatibility to high-fidelity model (detailed model). The model matching and updating strategy proposed by this paper lays the foundation for future multi-objective optimization of support structure mechanical properties.