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Evaluation of the Environmental Gamma-ray Dose Rate by Skyshine Analysis During the Maintenance of an Activated TFC in ITER

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Abstract

Gamma-ray exposure dose rates at the ITER site boundary were estimated for the cases of removal of a failed activated Toroidal Field (TF) coil from the torus and removal of a failed activated TF coil together with a sector of the activated Vacuum Vessel (VV). Skyshine analyses were performed using the two-dimensional SN radiation transport code, DOT3.5. The exposure gamma-ray dose rates on the ground at the site boundary (presently assumed to be 1 km from the ITER building), were calculated to be 1.1 and 84 μSv/year for removal of the TF coil without and with a VV sector, respectively. The dose rate level for the latter case is close to the tentative radiation limit of 100 μSv/year so an additional ∼14 cm of concrete is required in the ITER building roof to satisfy the criterion for a safety factor often for the site boundary dose rate.

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Authors and Affiliations

  1. Naka Fusion Research Establishment, Japan Atomic Energy Research Institute, Naka-machi, Naka-gun, Ibaraki-ken, 311-01, Japan

    S. Sato & H. Takatsu

  2. Hitachi Research Laboratory, Hitachi, Ltd, Omika-cho 7-2-1, Hitachi-shi Ibaraki-ken, 319-12, Japan

    K. Maki

  3. Business Automation Co Ltd., 3-10-17, Jyonan, Mito-shi Ibaraki-ken, 310, Japan

    K. Yamada

  4. Kawasaki Heavy Industries, Ltd., 2-6-5 Minamisuna, Koto-ku, Tokyo, 136, Japan

    S. Mori

  5. Max-Planck-Institute fur Plasmaphysik, ITER Joint Work Site, Boltzmannstrasse 2, D-85748, Garching bel Munchen, Germany

    H. Iida & R. T. Santoro

Authors
  1. S. Sato
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  2. H. Takatsu
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  3. K. Maki
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  4. K. Yamada
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  5. S. Mori
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  6. H. Iida
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  7. R. T. Santoro
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Sato, S., Takatsu, H., Maki, K. et al. Evaluation of the Environmental Gamma-ray Dose Rate by Skyshine Analysis During the Maintenance of an Activated TFC in ITER. Journal of Fusion Energy 16, 211–218 (1997). https://doi.org/10.1023/A:1021891203613

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  • DOI: https://doi.org/10.1023/A:1021891203613

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