One-Dimensional Activation Analysis of Vacuum Vessel of JT-60U with Deuterium Gas Discharges.

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概要

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• Identification of radionuclides and evaluation of dose rate level around a vacuum vessel of <BR>JT-60U tokamak device have been made. A one-dimensional calculation code was employed in this work. Radionuclides of <SUP>56</SUP>Mn (High-Mn steel of toroidal field coil case), <SUP>58</SUP>Co (Inconel-625 <BR>vessel) and <SUP>60</SUP>Co (SS-316 material of first wall) appeared after shutdown of operation with deuterium gases. Cobalt-58 and <SUP>60</SUP>Co with long half-life time contribute to the dose rate on the vessel by 7 to 3 proportion. The one-dimensional calculation provided a sufficient prediction for the dose rate on Inconel vessel of JT-60U, in which the activation property is mainly determined by <SUP>58</SUP>Co generated via threshold neutron reactions. The results calculated for the vessel dose rate showed a good agreement with data measured for the first 80 D-D operation weeks.

• 一般社団法人 日本原子力学会の論文

著者

• Miya Naoyuki

  Naka Fusion Establishment Japan Atomic Energy Research Institute

• Takeuchi Hiroshi

  Naka Fusion Research Establishment Japan Atomic Energy Research Institute

• NISHITANI Takeo

  Naka Fusion Establishment, Japan Atomic Energy Research Institute

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• One-Electron Loss Cross Section of Helium in Hydrogen Gas
• One-Dimensional Activation Analysis of Vacuum Vessel of JT-60U with Deuterium Gas Discharges.

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