Development and validation of a program for assessing the consequences of radioactivity releases from fusion reactor accidents
The deuterium-tritium fusion reaction is the fastest commercially achievable artificially controlled fusion reaction.However,tritium,as a fuel and neutron radiation-activated material,poses radioactive safety challenges.To simulate the migration of tritium and radioactive dust in the environment under accident conditions,a dispersion simulation program called ACCTRI(ACCidental model for TRItium release)has been developed based on the modified Gaussian multi-puff model,considering dry and wet deposition and tritium re-emission effects.The concentration and dose results calculated using ACCTRI are very close to those calculated using UFOTRI and HotSpot,with a maximum difference of no more than one order of magnitude.A comparison with the experimental results reveals that the results of ACCTRI with tritium buoyancy correction are close to the experimental data.ACCTRI has good accuracy and can be used as a reference for environmental radioactivity safety in fusion reactor site selection and hypothetical accident analysis.
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