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幌延深地層研究計画; 平成22年度調査研究計画

Horonobe Underground Research Laboratory Project; Investigation program for the 2010 fiscal year

中山 雅; 真田 祐幸; 佐野 満昭; 杉田 裕

Nakayama, Masashi; Sanada, Hiroyuki; Sano, Michiaki; Sugita, Yutaka

本計画は、原子力機構が堆積岩を対象に北海道幌延町で実施しているものであり、深地層環境における調査研究を実施し、その成果は地層処分の実施主体や安全規制機関に提供される。研究内容は地層科学研究と地層処分研究開発からなり、地下施設の建設と並行して調査研究を実施している。平成22年度は、研究所用地やその周辺において、地下施設の建設及び第2段階の調査研究を継続し、第3段階の具体的な調査研究計画を策定する。また、完成した一部の坑道を利用して第3段階の調査研究を開始する計画である。なお、本計画で実施する地下深部の地質環境を対象とした研究は、地球科学の幅広い分野にわたり、学術研究の発展にも広く寄与することから、国内外の関連する研究機関の専門家の参加を積極的に得つつ進めていく。

As part of the research and development program on geological disposal of high-level radioactive waste (HLW), the Horonobe Underground Research Center, a division of the JAEA is implementing the Horonobe URL Project with the aim at investigating sedimentary rock formations. According to the research plan described in the Midterm Plan of JAEA, geological investigations are to be carried out during the drilling of a shaft down to around 350 m depth, while research and development in the areas of engineering technology and safety assessment are to be promoted by collaboration with other research organizations. The results of the R&D activities will be systematized as a "knowledge base" that supports a wide range of arguments related to the safety of geological disposal. The Horonobe URL Project is planned to extend over a period of 20 years. The investigations will be conducted in three phases, namely "Phase 1: Surface-based investigations", "Phase 2: Construction phase" (investigations during construction of the underground facilities) and "Phase 3: Operation phase" (research in the underground facilities). This report summarizes the investigation program for the 2010 fiscal year (2010/2011). In the 2010 fiscal year, investigations in "geoscientific research", including "development of techniques for investigating the geological environment", "development of techniques for long-term monitoring of the geological environment", "development of engineering techniques for use in the deep underground environment" and "studies on the long-term stability of the geological environment", are continuously carried out. Investigations in "research and development on geological disposal technology", including "improving the reliability of disposal technologies" and "enhancement of safety assessment methodologies", are also continuously carried out. Construction of the underground facilities is ongoing at Access Shaft (East) and 250 m depth drift.

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