Design options for HLW repository operation technology. (2) Bentonite block forming and vertical emplacement

RWMC and JGC have been running an all-round R and D program for the period of 2000-2010 to develop the concept of Vertical Emplacement for disposal of vitrified waste. The conceptual design of its basic equipment was worked out in 2000, followed by forming the large-scale bentonite block in 2001-2004. Study has also been conducted on a mechanism to convey and position the large-scale block using a vacuum suction device. Subsequent to these developments, various technologies necessary for designing the Vertical Emplacement equipment have been reviewed, which would enhance engineering feasibility and reliability. Full-scale demonstration program under a joint research program with JAEA (Japan Atomic Energy Agency) started in 2008 with the twin objectives 1) supporting of public relations and 2) technical verification. The large-scale bentonite block and part of the full-scale Vertical Emplacement equipment are now on view at the Full-scale demonstration facility in Horonobe, Hokkaido, Japan. (author)