報告書番号

V08046

タイトル（和文）

安全解析のための数値モデルによる排ガス大気拡散予測および被ばく線量評価-風洞実験と数値モデルによる放出源の有効高さ・被ばく線量の比較-

タイトル（英文）

The Numerical Model for Atmospheric Diffusion and Evaluation of Effective Dose for Safety Analysis -The Effective Stack Height and Effective Dose Estimated by Wind Tunnel and Numerical Model-

概要 （図表や脚注は「報告書全文」に掲載しております）

安全解析のための原子力施設からの排ガス拡散予測用の数値モデルを開発し、既報告では実発電所（Ａ地点）へ適用し計算結果（放出源の有効高さ）の妥当性を確認してきた。本報告では、数値モデルを炉型が異なる実発電所（Ｂ地点）に適用し陸側全風向で放出源の有効高さを求めた。また、風洞実験と数値モデルによる放出源の有効高さを用いて被ばく線量計算を行った。その結果、(1)数値モデルによる放出源の有効高さは陸側全風向で風洞実験とほぼ一致すること（Ｂ地点）、(2)風洞実験と数値モデルによる有効高さの差が被ばく線量評価結果に及ぼす影響は小さくほぼ一致した分布となること（Ａ，Ｂ地点）、が明らかとなった。

概要 （英文）

A numerical simulation model has been developed to predict atmospheric flow and stack gas diffusion, considering the buildings and complex terrain located near and relatively far from a stack, respectively. The developed numerical model has applied to actual A-site, and effective stack heights were evaluated. The numerical model, then, is applied to B-site, in which the type of nuclear reactor, also the building and terrain conditions, were different from those in A-site, in this report. The effective dose and relative concentration of stack gas are also calculated using the effective stack heights obtained by wind tunnel experiment and numerical model. It is apparent that the effective stack heights estimated by calculations were almost the same as those obtained by the wind tunnel experiment at B-site. Furthermore, almost the same effective dose and relative concentration are obtained when using the effective stack heights obtained by wind tunnel experiment and calculation, and these agreements are showed at both A and B-site.

報告者

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