Method for container-free subsurface burial of solid radiation sources in abandoned deep workings of cryolite zone

FIELD: evacuation of radioactive wastes.

SUBSTANCE: proposed method for container-free subsurface burial of solid radioactive wastes in abandoned deep workings of cryolite zone involves delivery of solid radiation sources pre-cooled in winter to abandoned mine workings. Radiation sources are placed in layer-by-layer manner on prepared falsework paled floor, leveled, compacted, flooded with water, and frozen by natural cold before piling radioactive wastes to full height of subsurface workings. In the process, burial ground is shaped in the form of pillar. Split ice is added in the course of placing layers of solid radioactive wastes including their forced cooling with cold atmospheric air.

EFFECT: enhanced reliability and safety.

1 cl, 1 dwg

 

The invention relates to the field of radioactive waste management (RW), presents geological samples, cores, and radiation sources, standards, etc., worn out, stuck in remote Northern regions of the Russian Federation, do not have their own processing enterprises and landfills for disposal, transport them to processing facilities and disposal associated with considerable difficulties and costs.

There is a method of disposal of solid radioactive waste (SRAW are in progress in permafrost [RF Patent №2134459. CL G 21 F 9/24; publ. 10.08.99. Bull. No. 22] in the surface burial mound type, designed for the disposal of a large volume of soil, vegetation, sediment streams contaminated with radionuclides released to the surface as a result of accidents underground nuclear explosions.

The burial ground is being built in the winter, the deactivated site on a specially prepared and pre-frozen ground. SRAW are in progress are delivered with a decontaminated site, placed in layers with levelling, compacting, the Strait of water and freezing natural (atmospheric) cold.

On completion of installation of all SRAW are in progress over the formed letoborolrol design up to 1 m must be icy shell, playing the role of the battery is cold and the protective barrier that prevents the migration of radionuclides beyond the boneyard. Then stack insulation, waterproofing and soil layer, sesivany in summer perennial grasses, to prevent thawing of the burial ground, protect from rain and erosion damage.

The method of disposal and the design of the repository should provide complete isolation SRAW are in progress from biota for a period of not less than 100 years, even in conditions of possible global warming.

The main disadvantages of the above method are the necessity of the construction of the burial of large sizes (height >5 m) to ensure an adequate supply of cold to prevent it from thawing in the summer season or annual application of artificial recharge atmospheric cold in the winter, which is associated with certain difficulties; lack of capacity built burial ground height in case of detection of an additional amount SRAW are in progress; the high exposure of the burial thawing in summer in case of mechanical damage or potential forest fire, the need for strict observance of technological regulations and schedule of rehabilitation works.

The technical result of the invention zaklyuche who were long-term (for a period of not less than 100 years) and reliable isolation of different low-volume solid radiation sources, processing and disposal of which are currently in the North is impossible, and decrease the risk of radiation exposure to the population.

Proposed underground, besanceney method of disposal of solid radioactive radiation sources (TIREE) worked in underground mines (PGV) of the permafrost zone, which consists in the fact that pre-cooled in the winter TIREE delivered in PRTs, are stacked in layers on prepared fenced formwork deck, razravnivaetsya and compacted with Strait water and freezing natural cold to calculations TIREE at full height PGV, and the burial ground is formed in the form of a pillar of columnar shape, wherein at least the layer stacking TIREE additionally add crushed ice and forced blowing its cold outside air.

Maximum use of existing underground goaf, climate and natural resources of the North, first of all, the presence of permafrost significant power at extreme continental climate with long cold winter, as well as the specifics of natural and mining conditions underground mining of mineral deposits, promoting high reliability and durability underground Mogil the ICA TIREE, allow to reliably isolate high-level wastes. Safe disposal is determined by the following factors:

- high stability of mine openings while maintaining the frozen state of the host rocks;

- high load capacity built Leopardi pillars and backfill arrays;

- lack of inflows of groundwater into the excavation;

- low intensity of the processes of physical and chemical weathering in the exhaust mines;

negative thermal balance of the host rocks, and mines, operated with natural (alternating) thermal regime, which in the course of conducting mining operations are thoroughly frozen, and the enclosing rock mass accumulates a large number of cold;

year - round negative temperature exhaust mothballed mines.

The drawing shows the underground, beskontaktnoe disposal of solid radioactive radiation sources (TIREE) worked in the underground mines of the permafrost zone.

1 is leaning over the mountain by the secretion of an array of frozen rocks;

2 - roofing waste mines;

3 - soil excavation;

4 - ventilation borehole;

5 - intake fan;

6 - ventilation ru is AB;

7 - boot the borehole;

8 is a temporary dump TIREE;

9 - temporary stockpile of crushed ice;

10 - timbering;

11 - capacity water;

12 - pressure hose;

13 - injector;

14 - TIREE, cemented by ice.

Declare underground method of disposal of solid radioactive radiation sources (TIREE) in practice implemented as follows. In previously prepared an elaborate horizontal underground mine production from the surface drill two vertical wells, obsesively metal pipes, one of which serves for the purpose of ventilation, the second - for a list of TIREE.

To be buried TIREE in the winter temporarily warehoused at the mouth of the boot well, in addition prepare and store the crushed ice, which is used as filler for faster freezing buried TIREE in underground conditions, thereby significantly reducing in conjunction with a forced air blower cold air, the duration of freezing and construction.

In the mine workings under the boot well constructed periodically increasing the casing of rectangular cross-section, the dimensions of which are determined by the volume of buried TIREE and dimensions of manufacture. On the surface of the ventilation hole install intake fan and pave the blower adjust the operating sleeve into the ground; fill water tank and prepare to work the spray device.

TIREE is loaded into the well mixed with crushed ice. They are under their own weight comes in mining production, in the space enclosed by the casing, in the quantity necessary to obtain a layer thickness=30 see below, is the levelling and compacting the layer TIREE, followed by a Strait of water until complete saturation (by construction Leopardi pillars and backfill arrays used in mining) [Kiselev V.V., Burtsev I.S. disaster nuclear explosions in the permafrost zone. - Yakutsk: Publishing house of ANTS SB RAS, 1999, Nobuto G.P., Zubkov VP, Shkulev S. p. study of the formation Laporte filling array with layered frosting rocks // Physical-technical problems of development of mineral resources, 1998. No. 2 - p.66-71.]. After that, turn forcing the fan and is blowing stacked layer of cold outside air to speed up the process of freezing, after which produce laying the next layer until the complete packing of all TIREE or reaching up high output.

The result is a stable columnar leopardo construction of underground burial ground, protected from heat, fire, rainfall, what oterom TIREE, kompaundirovannymi ice, protected from possible theft and safe for biota.

On completion of the works for the disposal of TIREE need to carefully seal in the summer all of the wells, thereby eliminating possible leaks warm air and the ingress of rainfall in mountain production for isolation from the active workings of the mine should be erected insulation retainer to prevent air flow. On the external surface of the jumpers put prohibitory signs.

Upon detection of the emergence of new TIREE their disposal can be continued in the winter. It is sufficient to reactivate the well and harvested ice in sufficient quantity.

In this case there are two options for disposal of TIREE: by extension of an existing cemetery in height above technologies or construction of a new landfill. If you cannot implement the first option, the surface drill new boot well, and then all work is performed in the manner described above, using the existing vent hole with an elongated vent sleeve. When full, the entire area of excavation it sew (isolated) capital jumper, all well filled up an empty rock, but their stevecase concrete. Thus the underground test site radioactive waste, consisting of several individual mounds.

The proposed method (in comparison with the equivalent) to build a repository of small size and not the full height of production, to ensure high degree of security of the cemetery in the summer from the heat of solar radiation, forest fires, acts of rainfall. The cemetery also has a simple structure, and its erection requires a much smaller number of operations, since there is no necessity in the preparation and freezing of the ground, the construction of thermal insulation, waterproofing layers, erosion control.

Underground besanceney method of disposal of solid radioactive radiation sources in the exhaust underground mine workings of the permafrost zone, which consists in the fact that pre-cooled in the winter of solid sources of radiation are delivered in underground mining, are stacked in layers on prepared, fenced formwork deck, razravnivaetsya and compacted with Strait water and freezing natural cold before laying a solid radiation sources at the full height of the underground mine workings, and the burial ground is in the form of the pillar is of columnar shape, characterized in that at least laying a layer of solid radiation sources additionally add crushed ice and forced blowing its cold outside air.



 

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