Review, numerical validation, and experiment verification for Definite solution Analogy Theory (DSAT) in thermal-hydraulic scaling

The new generation of reactor technology, Fluoride-Salt-cooled high-Temperature Advanced Reactor (FuSTAR), is primarily intended for use in remote, underground, and arid areas. The design of the heat transport system and Passive Residual Heat Removal System (PRHRS) for FuSTAR has been completed, but verification is still pending. This study utilized the Definite Solution Analogy Theory (DSAT) for scaling analysis and constructed a scaling experiment platform to ensure accurate scaling and experimental verification. DSAT was validated through numerical simulation and experimental results, demonstrating the similarity of physical fields in dimensionless space between the prototype and experiment under the DSAT framework. Steady-state experiment results indicate that the PRHRS prototype can effectively remove over 1 % of decay heat from the total thermal power. Transient experiment results show that the maximum deviation of dimensionless solutions is less than 4 %, confirming the high accuracy of DSAT and demonstrating that PRHRS based on this framework can efficiently remove decay heat in the reactor. This work contributes to extending the scaling method for thermal-hydraulic systems in high dimensional space and transient conditions.