Horonobe Underground Research Laboratory Project; Investigation report for the 2006 fiscal year

Matsui, Hiroya ; Nakayama, Masashi ; Sanada, Hiroyuki

The Horonobe URL project is planned to extend over a period of 20 years. The investigations will be conducted in three phases, namely Surface-based investigations, Construction Phase (investigations during construction of the underground facilities) and Operation phase (research in the underground facilities). This report summerizes the results of the investigations for 2006 fiscal year (2006/2007), the second year of the Phase 2 investigations. The investigations, which are composed of Geoscientific research and R&D on geological disposal of high-level radioactive waste (HLW), were carried out according to Horonobe Underground Research Laboratory Project Investigation Program for the 2006 Fiscal Year.