Benchmark on beam interruptions in an accelerator-driven system. Final report on phase 2 calculations

In accelerator-driven system (ADS) development, it is important to evaluate temperature variations caused by beam trips, as this type of event in an ADS results in a temperature transient that can lead to thermal fatigue in the structural components of the subcritical system. A series of benchmarks is therefore being organised by the OECD Nuclear Energy Agency (NEA) for lead-bismuth-cooled and MOX-fuelled accelerator-driven systems. This report provides a comparative analysis of the Phase II calculation results of the beam trip transients at different power densities. In subsequent phases of the benchmark, temperature transients under irradiated fuel conditions will also be investigated. This report and those to follow will be of particular interest to ADS designers, including subcritical system physicists and accelerator scientists. (author)