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Report No.
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Horonobe Underground Research Laboratory Project; Investigation program for the 2010 fiscal year

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

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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