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International progress in developing cases for long-term safety of repositories for transuranic and long-lived intermediate level wastes; Summary of the Third International Workshop

TRU廃棄物及び長寿命中レベル廃棄物処分場の長期安全性の論拠についての国際的な進捗; 第3回国際ワークショップの要約

Mathieson, J.*; Hooper, A. J.*; Alexander, W. R.*; 塩月 正雄; 亀井 玄人 

Mathieson, J.*; Hooper, A. J.*; Alexander, W. R.*; Shiotsuki, Masao; Kamei, Gento

2005年1月、英国オックスフォードにて、TRU/中レベル廃棄物の処分適合性の研究の進捗について検討するための国際ワークショップが開かれた。これは1996年スイス、1999年日本での開催に続き、3回目であった。これらの廃棄物は、高レベル廃棄物にくらべて廃棄体としてより複雑であるにもかかわらず、それと同等なほどにはこれまで注意が払われてこなかった。この報告書ではこのワークショップの成果概要をまとめるとともに、その位置づけと今後の研究の方向性を示された。このワークショップでは今後求められる重要な課題や、検討対象に伴う不確実性が認識されたものの、これらの廃棄物処分のためのセーフティケース構築にあたって解決不能な障害はないと結論された。

In January, 2005 an international workshop was held in Oxford, UK to discuss research progress in the disposability of transuranic (TRU) waste (also known as long-lived intermediate level waste. This was the third such workshop, with two previous ones being held in Switzerland in 1996 and Japan in 1999. Whilst TRU/ILW represents more complex wasteforms than high-level waste (HLW) or spent fuel (SF), it is recognised that it has not received the same amount of attention. This paper summarises the themes discussed at the workshop and the conclusions derived. Moreover, it provides a status report and future direction of work in relation to TRU and ILW wastes. The overall conclusion of the workshop was a recognition of the uncertainties surrounding the subject and outstanding issues where further work was required. However, there were no insurmountable obstacles to making safety cases for the disposal of TRU/ILW waste - safety assessment strategies were at a mature stage.

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