幌延深地層研究計画; 平成21年度調査研究計画

Horonobe Underground Research Laboratory Project; Investigation program for the 2009 fiscal year

中山 雅 ; 真田 祐幸; 佐野 満昭; 杉田 裕 

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

本報告は、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幌延深地層研究計画の平成21年度計画を記述したものである。本計画は、調査研究の開始から調査研究の終了まで20年程度の計画とし、「地上からの調査研究段階(第1段階)」,「坑道掘削(地下施設建設)時の調査研究段階(第2段階)」,「地下施設での調査研究段階(第3段階)」の3つの段階に分けて実施することとしており、平成21年度は第2段階の5年目にあたる。平成21年度は、地層科学研究として、地質環境調査技術開発,地質環境モニタリング技術開発,深地層における工学的技術の基礎の開発及び地質環境の長期安定性に関する研究を、地層処分研究開発として、処分技術の信頼性向上及び安全評価手法の高度化についての調査研究を継続する。また、地下施設の建設については、水平坑道と東立坑の掘削を継続する。地上施設については、国際交流施設の建設を継続し、平成21年10月頃の運用開始を予定している。

As part of the R&D program on geological disposal of 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 intermediate depth, while R&D 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 2009 fiscal year, the 5th year of the Phase 2 investigations. In the 2009 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 140 m depth drift.