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Report No.
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Horonobe Underground Research Laboratory Project investigation program for the 2008 fiscal year

Nakayama, Masashi ; Sanada, Hiroyuki; Yamaguchi, Takehiro; Sugita, Yutaka 

As part of the research and development program on geological disposal of HLW, the Horonobe Underground Research Center, a division of the JAEA, is implementing the Horonobe Underground Research Laboratory Project (Horonobe URL Project) with the aim of 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 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" and "Phase 3: Operation phase". This report summarizes the investigation program for the 2008 fiscal year (2008/2009), the 4th year of the Phase 2 investigations. In the 2008 fiscal year, investigations in "geoscientific research" and "research and development on geological disposal technology" are continuously carried out. Construction of the underground facilities is ongoing at Ventilation Shaft and Access Shaft (East). Pre-boring around Ventilation Shaft is also carried out Regarding the surface facilities, construction of the International Communication House will be started.

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