Consequence calculations for PPCS bounding accidents

A ‘worst case’ assessment of the radiologically significant environmental source term, based on bounding accident analysis of a single blanket cooling loop loss of cooling accident (LOCA), has been performed for Fusion Plant Models A and B of the Power Plant Conceptual Study (PPCS). This paper describes the calculations of ensuing material mobilisation, transport in the containment, release to the environment and consequential dose to the public. Also reported is a comparison with more detailed dose calculations by Forschungszentrum Karlsruhe (FZK), for the same scenario, using real weather data. The results show that the calculated doses are comparable with, or slightly above, typical annual doses from natural causes.