Making of the underground scientific experimental programme at the Meuse/Haute-Marne underground research laboratory, North Eastern France

2007 ◽  
Vol 32 (1-7) ◽  
pp. 2-18 ◽  
Author(s):  
Jacques Delay ◽  
Agnès Vinsot ◽  
Jean-Marie Krieguer ◽  
Hervé Rebours ◽  
Gilles Armand
Keyword(s):  
Research Laboratory ◽  
Experimental Programme ◽  
North Eastern ◽  
Underground Research Laboratory

Mizunami Underground Research Laboratory in Japan: Pre-Excavation Site Characterization and Influence on Design Concepts

2001 ◽  
Author(s):  
Glen F. McCrank ◽  
Kenji Amano ◽  
Kaoru Koide ◽  
Hiroya Matsui ◽  
Shinichiro Mikake ◽  
...  
Keyword(s):  
Research Laboratory ◽  
Conceptual Models ◽  
Site Characterization ◽  
Geological Environment ◽  
Central Japan ◽  
Design Concepts ◽  
Experimental Programme ◽  
Nuclear Cycle ◽  
Underground Research Laboratory ◽  
Excavation Site

Abstract The Mizunami Underground Research Laboratory (MIU) will be constructed by the Japan Nuclear Cycle Development Institute (JNC) in central Japan. The project is planned in three overlapping phases consisting of I) Surface-based Investigation II) Construction and III) Operations Phases. This paper addresses the methods used to investigate the geological environment, the integration of the site knowledge into conceptual models and the application of the knowledge in designing the facility; some aspects of the future experimental programme are discussed.

Low Alkaline Cement Used in the Construction of a Gallery in the Horonobe Underground Research Laboratory

2010 ◽  
Author(s):  
Masashi Nakayama ◽  
Haruo Sato ◽  
Yutaka Sugita ◽  
Seiji Ito ◽  
Masashi Minamide ◽  
...  
Keyword(s):  
Fly Ash ◽  
Research Laboratory ◽  
Concrete Lining ◽  
Energy Agency ◽  
Tunnel Support ◽  
Long Term Stability ◽  
Alkaline Conditions ◽  
High Level ◽  
Underground Research Laboratory

In Japan, any high level radioactive waste (HLW) repository is to be constructed at over 300 m depth below surface. Tunnel support is used for safety during the construction and operation, and shotcrete and concrete lining are used as the tunnel support. Concrete is a composite material comprised of aggregate, cement and various admixtures. Low alkaline cement has been developed for the long term stability of the barrier systems whose performance could be negatively affected by highly alkaline conditions arising due to cement used in a repository. Japan Atomic Energy Agency (JAEA) has developed a low alkaline cement, named as HFSC (Highly Fly-ash Contained Silicafume Cement), containing over 60 wt% of silica-fume (SF) and fly-ash (FA). HFSC was used experimentally as the shotcrete material in construction of part of the 140m deep gallery in the Horonobe Underground Research Laboratory (URL). The objective of this experiment was to assess the performance of HFSC shotcrete in terms of mechanics, workability, durability, and so on. HFSC used in this experiment is composed of 40 wt% OPC (Ordinary Portland Cement), 20 wt% SF, and 40 wt% FA. This composition was determined based on mechanical testing of various mixes of the above components. Because of the low OPC content, the strength of HFSC tends to be lower than that of OPC. The total length of tunnel using HFSC shotcrete is about 73 m and about 500 m3 of HFSC was used. The workability of HFSC shotcrete was confirmed in this experimental construction.

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