06.06.2020

Radioactive wastes landfill "Podlesny"

Radioactive waste burial place near Pripyat

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During the liquidation of the consequences of the Chernobyl accident, the question arose about the creation of sites where the burial of radioactive waste that will occur after the explosion of 4 reactors will be carried out. The spent fuel storage facilities for such waste are not suitable and for this reason it was necessary to create and specially equip places in the zone where radioactive equipment, building constructions and the upper layer of soil, which was also contaminated after the explosion, will be buried using special technologies. One of these objects is the Radioactive wastes landfill "Podlesny".


The Podlesny radioactive waste burial site was built with the aim of reliable disposal and isolation from the environment of high-level waste generated during the liquidation of the consequences of the accident at Chernobyl NPP Unit 4. Radioactive wastes landfill "Podlesny" was built in extremely tight lines - design, construction and commissioning were completed in December 1986. Created for the tasks that were being solved at that time at the Chernobyl industrial site, it was decided to build a missile defense system at a small distance from the exploded block. Radioactive wastes landfill "Podlesny" was placed one and a half kilometers north of the Chernobyl nuclear power plant on the site of the former farm of the same name. The location was not chosen very well - since highly radioactive waste is stored almost on the shore of the reservoir (Pripyat Zaton), and only a kilometer from the Pripyat River. Radioactive wastes landfill "Podlesny" was built almost in the floodplain of the river. In turn, such an arrangement can cause serious environmental problems in the event of loss of tightness of containers and concrete containers (modules) in which radioactive waste is stored. Also, Radioactive wastes landfill is located nearby the Chernobyl sewage treatment plant and filtration fields. A kilometer from Radioactive wastes landfill "Podlesny" is the abandoned city of Pripyat.


Radioactive wastes landfill "Podlesny" is a modular storage facility for radioactive waste. This means that Radioactive Waste is located in special reinforced concrete compartments, the wall thickness of which reaches several meters. In Podlesnoye, eight modules were provided, which were placed on a common, monolithic base plate. Four modules, in the Radioactive wastes landfill "Podlesny" project they are called “Type A module”, have a reinforced concrete wall thickness of 1.12 meters. The other four modules (module B), designed for waste disposal with activity up to 250 X-rays per hour, have a wall thickness of 2.4 meters.


According to published data, Radioactive wastes landfill "Podlesny" has defects, and that is why in 1988 the filling of modules with high-level waste was stopped. By the way, the very filling of the modules with radioactive waste was carried out by special engineering machines equipped with protection against ionizing radiation - the very same ACE. The modules were loaded with radioactive waste in containers, barrels, as well as in bulk. During the period of operation of the Radioactive wastes landfill, only two modules were loaded into it (half of their design capacity). The dose rate of gamma radiation of radioactive waste buried in them ranges from 50 R / h to 250 R / h.

 

Upon detection of defects in the modules, the loading of radioactive waste was stopped. The filled modules were poured from above with concrete. The thickness of the concrete coating is one and a half meters. On top, a sand-gravel mixture was poured onto the concrete surface of the module.
Today, Podlesnyi Radioactive wastes landfill requires the development of measures that will reduce the potential hazard level of this facility in the exclusion zone. For these purposes, work is already underway. So in the 90s, VNIPIET surveys were conducted at the Radioactive wastes landfill "Podlesny" and it was determined that there are radioactive wastes with a total activity of 7,000,000 Ci in the Radioactive wastes landfill. How great this value can be imagined if we recall that, according to scientists, the total activity of the release of radioactive substances into the environment during the Chernobyl accident is 50,000,000 Ci.
We add that in addition to the Radioactive wastes landfill "Podlesny", in the territory of the Chernobyl exclusion zone there are several more radioactive waste disposal sites - the Buryakovka Radioactive wastes landfill and the ChNPP Third Stage Radioactive wastes landfill.


The current state of Radioactive wastes landfill "Podlesny" is controlled. In addition, a network of wells has been set up around the Radioactive wastes landfill, which controls the pollution of groundwater. In the event of significant leaks and leaching of radioactive waste into groundwater, this regulatory monitoring network will allow them to be quickly identified.
At the same time, a number of Ukrainian ecologists have already drawn public attention to the need for a quick solution to this environmental problem. Indeed, according to the legislation of Ukraine, high-level waste disposed of in Radioactive wastes landfill "Podlesny" must be moved to a storage facility created deep underground. Such storages are located in stable geological horizons, but at the moment in Ukraine there are no such storages.


Time goes by and the concrete base of Radioactive wastes landfill "Podlesny" does not get stronger. The heavy load of heavy modules on the foundation plate leads to the appearance of numerous cracks, which every year increases the likelihood of radioactive substances penetrating into groundwater.


Radioactive wastes landfill "Podlesny" is located in a floodplain that may be flooded during the spill of the Pripyat River, which may adversely affect the radioecological situation.

Books and articles on Radioactive wastes landfill "Podlesny":

 

 


REPORT on the state of nuclear and radiation safety in Ukraine. 2008 year.
WORKING Project Radioactive wastes landfill "Podlesny". Object conservation. year 2000.

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