Helium-cooled very high-temperature gas reactors are highlighted as a key technology with the potential to improve the competitiveness of nuclear energy within the Generation IV International Forum (GIF). Developing tools and methods to support this technology is seen as a priority by NEA member countries. The purpose of the benchmarking exercise is to compare various coupled core physics and thermal fluids analysis methods available in the high-temperature reactor (HTR) community. The modular high-temperature gas-cooled reactor (MHTGR) design serves as a basis for the benchmark, with some aspects having been modified for simplicity and consistency. Exercises and results will enhance the detailed understanding of events and processes, and identify where further efforts should be directed to improve modelling and simulation capabilities.
The benchmark exercise has the following objectives:
The technical topics presented in the final documentation of the benchmark exercise are:
The Working Party on Scientific Issues and Uncertainty Analysis of Reactor Systems (WPRS) studies the reactor physics, fuel performance, and radiation transport and shielding in present and future nuclear power systems.