Novel high-level waste deep geological disposal buffer material and construction method thereof

Abstract

The invention discloses a novel high-level waste deep geological disposal buffer material. Clay, a microbial solution taking peanut shell powder as a carrier and consolidation liquid are stirred together; the microbial solution is a bacterial solution obtained by mixing bacillus sphaericus, sporosarcina pasteurii, bacillus megatherium, bacillus lentus, bacillus pasteurii and the like, and the consolidation liquid is a mixed solution obtained by mixing calcium chloride or calcium nitrate and urea. The invention further discloses a construction method utilizing the buffer material. The method includes the steps that a disposal repository is selected, a partition plate is installed at the bottom of the disposal repository, porous stone is put on the partition plate, a layer of clay is laid onthe porous stone, a high-level waste tank is placed on the clay, the disposal repository is backfilled with the clay, a waste liquid recycling tank and a gas cylinder are opened, the microbial solution and the consolidation liquid are introduced, the clay on the surface of the disposal repository is rolled for covering, and the surface of reinforced clay is flat and smooth. Accordingly, the thermal conductivity, plasticity and long-term stability are very good, and the safety of high-level waste disposal is effectively guaranteed.

Description

technical field [0001] The invention relates to a novel buffer material and a construction method thereof, in particular to a novel high-level radioactive waste geological disposal buffer material and a construction method thereof. Background technique [0002] The continuous development and utilization of nuclear energy, the production and research of the nuclear industry, and the application of nuclear technology will produce a certain amount of nuclear waste, which can be divided into low-level waste, intermediate-level waste and high-level waste according to their radioactive levels. At present, there are relatively mature technologies in the world for the ultimate safe disposal of waste. [0003] High-level radioactive waste usually refers to the high-level radioactive waste liquid and its solidification produced by the reprocessing of spent fuel, as well as the spent fuel components that are directly treated as waste. High-level radioactive waste is characterized by h...

AI Technical Summary

Problems solved by technology

[0008] At present, bentonite is used as a buffer material in China, but bentonite also has some disadvantages, such as: (1), the plasticity is too high, it is difficult to compact to the specified dry density, resulting in poor constructability; (2), the thermal conductivity of pure bentonite It is not particularly high, and it may be difficult to transfer heat to the surrounding bedrock in time

(3) During the long-term geological disposal process, when the groundwater infiltrates the buffer backfill material—bentonite—contacts the disposal tank, the metal disposal tank will have the risk of corrosion and leakage