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PNC TJ 1449 98-007(2) MARCH, 1998

Design Study of Underground Facility of the Underground Research Laboratory

Keisuke Hibiya" Kenji Akiyoshi2) Mineo Ishizuka3) Susumu Anezaki4) ABSTRACT

Geoscientific research program to study deep geological environment has been performed by Power Reactor and Nuclear Fuel Development Corporation (PNC). This research is supported by "Long-Term Program for Research , Development and Utilization of Nuclear Energy". An Underground Research Laboratory is planned to be constructed at Shoma-sama Hora in the research area belonging to PNC. A wide range of geoscientific research and development activities which have been previously studied at the Tono Area is planned in the laboratory. The Underground Research Laboratory is consisted of Surface Laboratory and Underground Research Facility located from the surface down to depth between several hundreds and 1,000 meters. Based on the results of design study in last year, the design study performed in this year is to investigate the followings in advance of studies for basic design and practical design: concept .design procedure, design flow and total layout. As a study for the concept of the underground facility, items required for the facility are investigated and factors to design the primary form of the underground facility are extracted. Continuously, design methods for the vault and the underground facility are summarized. Furthermore, design procedures of the extracted factors are summarized and total layout is studied considering the results to be obtained from the laboratory.

Work performed by Corporation, , and under contract with Power Reactor and Nuclear Fuel Development Corporation. PNC Liaison: URL Planning Section, Tono Geoscience Center Seietsu Takeda 1) Kajima Corporation, Kajima Technical Research Institute 2) Obayashi Corporation, Design Department No.2 Civil Engineering Technical Division 3) Shimizu Corporation, Civil Engineering Division 4) Taisei Corporation, Engineering Division