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Simulation of the atmospheric dispersion of 85Kr from a reprocessing plant over a coastal area

Performance examination of an emergency environmental radiation dose evaluation code system, SIERRA-II

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Abstract

The performance of the computer code system, SIERRA-II, for calculating the environmental radiation dose due to an accident was assessed over a coastal area, using the environmental monitoring data around the coastally located Tokai Reprocessing Plant (TRP) when 85Kr was discharged during its operation. The agreement within a factor of 5 between the calculated and observed air concentrations of 85Kr in areas of a few km from the TRP was achieved in 57% of the comparison data, disregarding the internal boundary layer. The mean fraction bias was −0.6, which meant a slight overestimation. According to the vertical profile of the atmospheric temperatures, the internal boundary layer was modeled with the SIERRA-II and the agreement became better than when the internal boundary layer was not considered.

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Author notes

  1. H. Watanabe

    Present address: Mito Atomic Energy Office, Ministry of Education, Culture, Sports, Science and Technology, 4-1, Atago-cho, Mito-shi, Ibaraki, 310-0054, Japan

Authors and Affiliations

  1. Nuclear Fuel Cycyle Engineering Laboratories, Japan Atomic Energy Agency, 4-33, Muramatsu, Tokai-mura, Naka-gun, Ibaraki, 319-1194, Japan

    M. Takeyasu, H. Watanabe & M. Takeishi

  2. Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8063, Japan

    T. Iida

  3. Electric Power Systems Group, Hitachi Engineering Co., Ltd., 3-2-1, Saiwai-cho, Hitachi-shi, Ibaraki, 317-0073, Japan

    A. Yamamoto

Authors
  1. M. Takeyasu
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  2. T. Iida
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  3. H. Watanabe
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  4. M. Takeishi
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  5. A. Yamamoto
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Takeyasu, M., Iida, T., Watanabe, H. et al. Simulation of the atmospheric dispersion of 85Kr from a reprocessing plant over a coastal area. J Radioanal Nucl Chem 275, 43–54 (2008). https://doi.org/10.1007/s10967-006-7000-3

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  • DOI: https://doi.org/10.1007/s10967-006-7000-3

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