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KMID : 0364920140390020089
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Journal of Radiation Protection and Research
2014 Volume.39 No. 2 p.89 ~ p.95
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Importance Analysis of Radiological Exposure by Ground Deposition in Potential Accident Consequences for the Licensing Approval of a Nuclear Power Plant
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Hwang Won-Tae
Jeong Hae-Sun
Jeong Hyo-Joon
Kim Eun-Han
Han Moon-Hee
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Abstract
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In potential accident consequence assessments for the licensing approval of LWRs, the ground position of radionuclides released into the environment is not allowed into the models, as recommended in the U. S. Nuclear Regulatory Commission’s regulatory guide. Meanwhile, it is allowed into the assessment models for the licensing approval of PHWRs with consideration of more detailed physical processes of radionuclides in the atmosphere. Under these backgrounds, importance of exposure dose by ground deposition was quantitatively evaluated and comprehensively discussed. For potential accidental releases of 137Cs and 131I, total exposure doses were more conservative in case of without consideration of ground deposition than in case of with its consideration. It was because of that the depletion of air concentration resulting from ground deposition is more influential in the contribution to total exposure doses than additional doses from contaminated ground. The exposure doses by the inhalation of contaminated air showed the contribution of more than 90% in total exposure doses, depending on atmospheric stability, release period of radionuclides and distance from a release point. The exposure doses from contaminated ground showed less than 10% at most in contribution of total exposure doses. The ratios of total exposure doses in case of with consideration of deposition to without its consideration for 131I were distinct than those for 137Cs. As the atmosphere is more stable, release duration of radionuclides is longer, distance from a release point is longer, it was more distinct.
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KEYWORD
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Accident consequence assessment, Regulatory guide, Ground deposition, Air concentration, Exposure dose
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