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MA核変換を目的とした加速器駆動未臨界システムの概念検討,1; 全体概要

Conceptual design of accelerator-driven system for transmutation of minor actinide, 1; Overview of research program

辻本 和文 ; 西原 健司  ; 武井 早憲   ; 菅原 隆徳  ; 岩元 大樹   ; 大泉 昭人   ; 佐々 敏信   

Tsujimoto, Kazufumi; Nishihara, Kenji; Takei, Hayanori; Sugawara, Takanori; Iwamoto, Hiroki; Oizumi, Akito; Sasa, Toshinobu

高レベル放射性廃棄物中に含まれる長寿命核種であるマイナーアクチノイド(MA)を分離・回収し、短寿命核種あるいは安定核種に変換する分離変換技術を導入したMAリサイクルシステム概念の一つとして、発電用核燃料サイクルとは別に小規模の核変換専用サイクルを設けて、その中で加速器駆動核変換システム(ADS)を用いてMAの核変換を行う方法(ADS階層型)が考えられている。本研究開発プログラムは、平成25年度から4年計画で、液体鉛ビスマス冷却ADSを対象に、ADSの技術的課題に対する解あるいは解に対する技術的見込みを得ることを目的に研究開発を実施している。本発表では、これまでの研究開発成果を報告する。

To continue the utilization of the nuclear fission energy, the management of the high-level radioactive waste (HLW) is one of the most important issues to be solved. Partitioning and Transmutation (P&T) technology of HLW is expected to be effective to mitigate the burden of the HLW disposal by reducing the radiological toxicity and heat generation. The research and development on P&T in Japan are basing on two kinds of concepts: one is the homogeneous recycling of minor actinide (MA) in commercial fast breeder reactors and the other is the dedicated MA transmutation, so-called "double-strata" strategy, using an accelerator-driven system (ADS). The objective of this research program is to enhance the technology revel from basic research phase to semi-engineering research phase for the main component of the double-strata P&T concept, MA partitioning process and the ADS technologies. For the ADS, the simulation experiments in the critical assembly connecting with the proton accelerator will be carried out to accumulate the reactor experimental results to solve R&D issues in the reactor physics aspect of the ADS. The results of this R&D program will be reflected on the assessment of the technically feasibility for each technology.

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