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ウラン廃棄物の余裕深度処分概念の検討

Study of Subsurface Disposal Concepts for Uranium Waste

山本 正幸*; 石橋 純*

Yamamoto, Masayuki*; Ishibashi, Makoto*

ウラン廃棄物は、その主要核種が長半減期のウランであり、また、廃棄体からの放射線の影響をほとんど考慮しないでよいという特徴をもっている。これまでも余裕深度処分相当のウラン廃棄物の検討が実施されてきたが、これらの特徴が十分に反映されてこなかった。これらのウラン廃棄物の特徴を踏まえて次の合理的な処分概念を検討した。/1)岩盤空洞+コンクリートピット/ 2)岩盤空洞+モノリス 3)岩盤空洞+トレンチ/処分概念の操業中及び管理期間終了後の安全性について検討した。廃棄体から受ける作業者の被ばく線量は大きくないことがわかった。また、管理期間終了後、一般公衆が受ける被ばく線量は、人工バリアを軽減しても、大きく変化しないことがわかった。さらに、規制、操業、管理期間対応に関する課題点を摘出した。

Uranium waste has features that the main nuclide is long-lived uranium and it is not almost necessary to consider radiation influence from waste package. Although the many studies for subsurface disposal concept of uranium waste have been done, the wastes features were not carefully considered in the former studies. The following reasonable disposal concepts have been designed considering the features in this study. (1) Concrete vault disposal concept in rock cavern (2) Monolithic disposal concept in rock cavern (3) Trench disposal concept in rock cavern / The safety of the disposal concepts during operation and after control phase has been investigated in this study. As the result, it has been shown that the exposure dose of workers due to waste package is not high. And it has been shown that the exposure dose of the public does not change so much, even if the engineered barrier has been reduced. Besides some issues regarding regulation, operation and monitoring have been picked up.

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