Million Curie Inheritance
The completion of the conservation of Karachay became historical for the Mayak plant, the region and the nuclear industry, an event that allows us to talk about solving one of the most important problems that were inherited from the Soviet nuclear project. The federal target program “Ensuring Nuclear and Radiation Safety for 2008 and for the Period Until 2015” helped.
Hourly dead water
The groundwater contour, the state of the backfill elements are monitored by a serious monitoring system, and this will be monitored by specialists from Mayak, specialized scientific organizations, for several decades to go. Karachay, which can serve as a classic example of a site for the disposal of special radioactive waste, will exist for hundreds of years. Special studies have shown that such a repository is safer to leave where it is now, rather than engage in the extraction and re-burial of dangerous fractions in another place.
“A year has passed, and the reservoir was filled up with no surprises,” said Dmitry Soloviev, acting head of the Mayak PO ecology department. - We have installed 1090 signs, which make marks - is there a movement of the ground or not. The processed data will be the basis for building the 3D model of processes occurring under several layers of backfill. At each such point, dose rate monitoring is additionally carried out depending on the shrinkage of the soil and the water level in the closed part of the water area. ”
The study of groundwater migration was initially focused on the efforts of the specialists of “Hydrospetsgeology”, “Mayak”, the Academy of Sciences of the USSR (and then RAS), leading mathematicians and programmers of the Physics and Energy Institute from Obninsk. A three-dimensional model was created jointly that made it possible to predict the dynamics of processes for centuries to come.
“All our efforts are now aimed at justifying the next stages of Karachai conservation and transferring it to a new legal status -“ burial point ”, says Yuri Mokrov, Advisor to the General Director of the Mayak Production Association on science and ecology. - This procedure will take several years. After that, both the reservoir and the territory adjacent to it, as required by law, will be handed over to operation to the National Radioactive Waste Management Operator. The Mayak specialists are engaged in substantiating various aspects of the reservoir safety. This work, which has no analogues in the world today. During the first ten months of monitoring after the closure of the Karachai water area, a decrease in radionuclide release to the surface was recorded, and the groundwater level of the reservoir is at the scheduled elevations and does not cause concern. This led to a further improvement of the radiation situation in the area of the enterprise and nearby communities. ”
History of the nuclear swamp
What is Karachay? The B-9 reservoir formed in the 1951 year at the place of the former closed drainage swamp is a surface storage facility for intermediate level liquid radioactive waste. Its operation continued 64 of the year. Nuclear weapons production was dropped into several hundred million Curie in Karachay. Since the beginning of the B-9 reservoir operation, its level has been rising, the water area has been constantly increasing. Known natural and technogenic accident 1967 of the year (wind separation of bottom sediments), fortunately, did not lead to serious radiation consequences for the population and the environment, but showed the potential danger of a repetition of this in the future under abnormal meteorological conditions. After this incident, the USSR government decided to liquidate Karachai.
During 1967 – 1971, bare previously flooded areas and shallow waters were filled up, and recultivation of the territories around the lake was carried out. Until the middle of the 70-s continued liquidation of the consequences of the emergency, arrangement of the coast was carried out, experimental work on the backfill of the water area began. By the middle of 80-x, this technology was finally debugged. It was decided to fill the reservoir with rocky soil using special structures - hollow concrete blocks, which allow localizing bottom sediments. Currently, more than 200 thousand cubic meters of highly active man-made silts and loams forming the bed of the reservoir are reliably isolated in Karachai.
However, the history of the reservoir B-9 does not end there. For him, as already mentioned, will follow decades.
Karachay, Karachay ...
Chelyabinsk region is known for the most significant accumulation of foci of radioactivity. In 1949, the first in the country industrial complex for plutonium production was launched here, the Mayak Production Association was established. The tight deadlines for the commissioning of nuclear facilities in the almost complete absence of radiation and process control systems in 1949 – 1956 led to the dumping of huge amounts of liquid radioactive waste into the Techa River.
In September, 1957, an explosion occurred at Mayak, as a result of which a radioactive cloud formed that covered the territory of the Chelyabinsk, Sverdlovsk and Tyumen regions.
From the beginning of 50, wastes were also dumped into the shallow marshy lake Karachay.
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