Speaker
Description
With the upgrade of in-vessel components, heating systems and the construction of specialized tritium storage, injection and collection system, EAST Tokamak will be ready for a short D-T operation phase (weeks) embedded within longer D-D phases, by the end of 2026 or later. This report summarizes the radiation safety analyses conducted for this campaign, to address the satisfaction of radiation safety requirements approved by the authority body.
The characterized radiation source terms are the prompt radiation, induced radioactivity in materials, air and water, the tritium. The main measures for radiation safety include the functioning of the existing tokamak hall with 1.5m-thick concrete walls, 1m-thick concrete roof and radiation shielding doors, the implementation of a radiation zoning and access control, and the upgraded radiation safety monitoring and interlock system. In addition, specific tritium safety measures, including a multi-layer tritium containment system (vacuum boundary, gloveboxes, sealed hall) will be implemented. The analyses indicated that radiation safety risks will be well-controlled. The dose rates outside the hall are below the control level of 2.5 µSv/h during operation and the shutdown dose rates inside the hall will below the control level in an acceptable time. The integrate dose of the radiation workers and the public are significantly below regulatory constraints of 5 mSv/a and 0.1 mSv/a, respectively. Radioactive waste management ensures no planned release of tritium, gaseous and liquid effluents are captured and stored, while solid waste is stored or disposed of via authorized routes. Preliminary accident analyses demonstrate that the dose of the public remains below the dose constraint 1 mSv even under severe external events.
The analyses confirm that adequate protection for radiation workers, the public, and the environment is assured with the technical and administrative measures for the EAST D-T campaign.
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