Speaker
Description
The monitoring of plasma impurity influx in ITER is facilitated by the X-Ray Crystal Spectrometer-Survey (XRCS-Survey) located in Equatorial Port-11. To ensure high-sensitivity X-ray collection, this diagnostic utilizes a windowless line-of-sight; however, this open optical path creates a direct path for significant neutron streaming toward the spectrometer assembly. This study evaluates the resulting neutron-induced material activation to establish the technical foundation for radiation zoning, shielding optimization, and personnel safety protocols. As ITER transitions from low-power commissioning toward the SA-2 phase, the diagnostic environment shifts from non-nuclear validation to the high-intensity performance requirements of burning plasma under full Deuterium-Tritium (DT) conditions. To address these challenges, a comprehensive material activation study was conducted using a dual-stage computational workflow, coupling high-fidelity neutron transport results with the FISPACT activation code. Utilizing vitamin-j 175-group neutron flux files, scenario-specific irradiation and cooling schedules, the analysis identifies critical nuclide inventories, total activity, decay heat, and dose rates essential for radwaste classification and maintenance access control. Further analysis on the new irradiation scenario is ongoing for XRCS-Survey components, covering both the Interspace Support Structure (ISS) and Port Cell Support Structure (PCSS). Collectively, these results provide the validated data required for optimizing design, defining radiation zones, and ensuring the long-term safety of operations and decommissioning for the XRCS-Survey system.
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