Recommended application field: This technique has been developed for early-stage DGR borehole siting. The DGR boreholes may be utilized for the disposal of the highly-hazardous radio-active wastes: spent nucler fuel, vitrified high-level wastes, and long-lived itermediate-level wastes.

Advantages over analogues: In contrast to a mined geological repository, the degree of safety of waste disposal in borehole repositories is assured primarilyby natural barriers (depth of waste package allocation, stagnant water exchange and lengthy pathways of radionuclide migration towards biosphere) rather than by engineered safeguards. Up to now the practical experience of siting waste repository has been obtained only for the case of mined repositories. Basic advantages include: - The proposed tehnyque makes it possible to decrease cost and speed-up selection of promising sites by discriminating areas of a few dozen km2 out of larger regions tens of thousands km2. - This technique enebles selection of promising sites within crystalline rock even in the presence of thick sedimentary covers; - The tehnoloque is the application of remote methods.

The development stage readiness: Tested experimental exploitation order

Description of the development:
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The perpose of siting repositories is to reveal those most promising for the development of deep geological repository (DGR) for radioactive wastes. The technique of siting borehole DGRs is described as follows. This technique takes into account IAEA recom-meditions and requirements with respect to DGR siting, national regulatory requirements as well as preliminary requirements and other considerations identified by the designers for a stage-by-stage siting. The proposed technique is based on the application of the following methodological package: - Analysis of literature and data of geological and hydrogeological structures and rock properties over the area to be studied as well as data reinterpretation according to new objectives; - Aerospace image decoding (revealing areas minimally dislocated by tectonics); - Field seismic studies (identification of sedimentary patterns, detection of dislocations in srystal-line rocks); - Field magnetic and gravimetric studies (revealing blocks composed of minimal types of crystalline rocks with minimal density gradient); - Indicator studies (gas surveys) for groundbased verification of aerospace imare date decoding; - Siting of exploration boreholes, borehole drilling with detailed sampling and resting (to obtain data for an assessment of radioactive waste disposal safety); - Processing and interpretationof drilling and test studies data with subsequent verification of groundwater flow and transport models; - Development of refined groundwater flow and transport models as well as simulation tests; - Assessment of the longterm safety of radioactive waste disposal systems using data obtained to plan further studies.

corresponds technical description
Guarantees stable results getting

Possibility of transfer abroad:
Licence's sale

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Country Ukraine

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E-mail: gal@uintei.kiev.ua