Investigations of the Nizhnekanskiy Granitoid Massif (Middle Siberia, Russia) as a Promising Territory for Deep Geologic
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1. A PLAN FOR SELECTION OF A SITE SUITABLE FOR SOLID HLW DISPOSAL Based on scientific knowledge in the field of radioactive waste management and of geological-geochemical processes for transport of substances within the earth's crust, the following criteria were identified for a site suitable for solid HLW disposal [1]: "* Adequate size for accommodation of a repository, including its protective pillar "• Minimum permeability for the radionuclides disposed "* Absence of considerable mineral resources "* Ability to retain its protective properties for the required period of time "* The best of all available sites considering all the above factors. Selection of a site to meet the above criteria is proceeding according to the following staged plan: I.
Determination of initial data, purposes and strategy. Selection of a region in which to search for promising geological formations. Scale of research: 1: 1,000,000-1:200,000
II.
Search of promising areas for research. Scale of research: 1:200,000-1: 100,000
III. Evaluation of the promising areas and choice of promising sites for detailed survey. Scale of research: 1:100,000-1:50,000 IV. Sequential complex surveys on promising sites for the purpose of choosing the most suitable site for the creation of a repository (in the case of a negative result this stage of work is repeated on alternative areas). Scale of research: 1:50,000-1:25,000 V.
Detailed exploration of the chosen site and analysis of the data obtained (in the case of a negative result this stage of work is repeated on alternative sites). Scale of research: 1:25,000-1:10,000 Upon confirmation of the suitability of the selected site: VI. Creation of an underground research laboratory based on information from pilot technological wells. Use of this laboratory for research and experiments to determine sitespecific information needed to construct and operate a repository. VII. Complex analysis of data obtained from the site-specific research and testing, resulting in recommendations relative to construction of the repository. VIII. Realization of a feasibility study, validation of the project, and repository design. 2. CHOICE OF THE NIZHNEKANSKIY GRANITOID MASSIF At the first stage of work it was necessary to choose a search region in a promising geological formation. Therefore, we evaluated the potential suitability of global geological structures within a radius of 500 km from the MCC (the West-Siberian Plate, the East-Siberian Platform, and the Altai-Sayan Orogenic Area, Fig. 1).
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An analysis of all available geological information for these areas has shown that the most suitable geologic structure in which to search for a site suitable for disposal of solidified HLW is the Southern Part of the Yenisei Ridge, an outcrop of the ancient base of the Siberian platform. The second-stage task was to determine the most promising geological formation in the Southern part of the Yenisei Ridge. This second-stage search was limited to a territory of about 9,000 km2 that included the Southern part of the Yenisei
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