The method of isolation of solid radioactive waste from the environment

 

(57) Abstract:

Usage: at the disposal of solid radioactive waste in the ground to increase the security of the method for the environment and opportunities for radiological monitoring of the behavior of radionuclides TRO directly in concrete tanks during long-term storage. The inventive method includes the creation of underground concrete tanks, separated by concrete walls into sections, the installation sections of perforated pipe, filling in sections of concrete capacity TRO, fill TRO mixture of non-radioactive cement mortar with inorganic sorbent, closing sections of concrete capacity of reinforced concrete slabs with conical holes, the identification of unfilled cavities in sections, drilling through thermoplastic material of the conical hole and AMERICANIA SRW wells before drilling identified an unfilled cavities, filling cavities and wells with a mixture of non-radioactive cement mortar with inorganic sorbent, sealing concrete slabs partition capacity and long-term exposure TRO, in the process, which pleased the

The inventive method of isolation of solid radioactive waste from the environment relates to the field of environmental protection, and more specifically to the field of disposal of solid radioactive waste (SRW). Most effectively the inventive method can be implemented at the disposal of solid radioactive waste in near surface layers of rock masses composed of permeable rocks (clay, loam, etc.)

There is a method of isolating the solid from the environment (1), including the creation loam rock massif, located above the level of groundwater, trench, filling the trench TRO, fill TRO cement mortar prepared on the basis of liquid radioactive waste (LRW), monolithic TRO by exposure of cement to the formation of a cement stone, sealing the upper part of the trench and long-term exposure TRO, which is carried out by its radioecological monitoring by sampling soil and water from the rock mass located around the trench and measuring their level of specific activity.

The disadvantages of this method are the increased risk of its implementation to the environment due to the unreliability localisationcache control over the behavior of radionuclides TRO directly in the trench, allowing to prevent environmental pollution during their delocalization of americanna TRO.

Increased risk of implementation of the method to the environment due to:

- nepredusmotritelnost create in the trench protective barrier, isolating the solid from the rock mass;

- use as a material for filling TRO cement mortar prepared on the basis of LRW, after forming the stiffening permeable radioactive cement stone, not able to hold the radionuclides TRO and bad holding in itself radionuclides LRW;

- impossibility when filling TRO cement mortar guaranteed fill all voids between the pieces of the solid in which long-term exposure will be an accumulation of atmospheric condensate water and groundwater that can destroy the monolith TRO and endure in the environment radionuclides;

There is a method of isolating the solid from the environment (2), including the creation of a rock mass excavation, construction therein concrete tanks, concrete filling capacity TRO, fill TRO cement mortar prepared on the basis of LRW, monolithic TRO by keeping the cement is urgent the shutter speed TRO in concrete tanks.

The disadvantages of this method are the increased risk of its implementation to the environment due to the unreliability of radionuclide localization TRO when their long-term aged in concrete tanks, and nepredusmotritelnost implementation of the radiological control the behavior of radionuclides TRO directly in concrete tanks, allowing to prevent environmental pollution during their delocalization of americanna TRO.

Increased risk of implementation of the method to the environment due to:

- use as a material for filling TRO cement mortar prepared on the basis of LRW, after forming the stiffening permeable radioactive cement stone, not able to hold the radionuclides TRO and bad holding in itself radionuclides LRW;

- impossibility when filling TRO cement mortar guaranteed fill all voids between the pieces of the solid in which long-term exposure will be an accumulation of atmospheric condensate water and groundwater that can destroy the concrete capacity, monolith TRO and endure in the environment radionuclides;

Most bli reinforced concrete tanks separated by concrete walls into sections, covering the inside surfaces of the bottom and walls of reinforced concrete tanks waterproofing composition, structure around the walls of the reinforced concrete tank earthen castle (waterproofing clay layer), creating around a clay castle drainage ditches, filling in sections of concrete capacity TRO, fill TRO non-radioactive cement mortar, poured TRO by exposure of cement to the formation of a cement stone, closing the filled sections of concrete capacity of reinforced concrete slabs, sealing concrete slabs and long-term exposure TRO in concrete tanks.

The disadvantages of this method are the increased risk of its implementation to the environment due to the unreliability of radionuclide localization TRO when their long-term aged in concrete tanks, and nepredusmotritelnost implementation of the radiological control the behavior of radionuclides TRO directly in concrete tanks, allowing to prevent environmental pollution during their delocalization of americanna TRO.

Increased the livki TRO non-radioactive cement, formed after hardening of the cement stone, unable to sorption or chemisorption fixation of radionuclides TRO and with poor waterproofing (from its porosity) properties;

- impossibility when filling TRO non-radioactive cement mortar guaranteed fill all voids between the pieces of the solid in which long-term exposure will be an accumulation of atmospheric condensate water and groundwater that can destroy the concrete capacity, monolith TRO and endure in the environment radionuclides;

- nepredusmotritelnost in the process of implementing the known method the elimination of unfilled non-radioactive cement mortar voids between the pieces of the TRO.

The advantages of the proposed method are improving the safety of its implementation for the environment and the potential for radiological monitoring of the behavior of radionuclides TRO directly in concrete tanks during long-term storage.

These advantages are achieved by the inventive method includes the creation of underground concrete tanks, separated by concrete walls into sections, pokrytyh walls reinforced concrete tank earthen castle (waterproofing clay layer), creating clay around the castle drainage ditches, installation of sections of perforated pipe with a height greater than the height of the sections, the creation of reinforced concrete slabs holes perforated pipes and along the longitudinal axis of reinforced concrete slabs conical tapering from top to bottom of the hole, the conical holes thermoplastic material, filling in sections of concrete capacity TRO, fill TRO mixture of non-radioactive cement mortar with inorganic sorbent, monolithic TRO by exposure of the mixture before formation of the cement stone, closing sections of concrete capacity of reinforced concrete slabs with conical holes, the identification of unfilled cavities in sections, drilling through thermoplastic material of the conical hole and AMERICANIA SRW wells before drilling identified an unfilled cavities, installation in wells technological pipes, heating thermoplastic material of the conical holes to ensure the sealing of the joining places with him technological pipes, cooling of thermoplastic material of the conical holes, the injection of technological pipes identified unfilled cavity mixture Nera the holes, remove from wells technological pipes, cooling of thermoplastic material of the conical holes, filling through these holes, wells a mixture of non-radioactive cement mortar with inorganic sorbent, an extract of a mixture of non-radioactive cement mortar with inorganic sorbent in cavities and wells to the education of her cement stone, heating thermoplastic material of the conical holes before they zaplavlenie, sealing concrete slabs partition capacity and long-term exposure TRO, which perform radiological monitoring buried TRO by sampling from the tank through the perforated pipe and radionuclide analysis, and the angles of the conical tapering from top to bottom of the holes, as well as the distances between every two adjacent tapering from top to bottom conical holes on the concrete lids are equal, and the total number of holes (N) is determined from the relation:

N = L/2H tg of 0.5 ,

where L is the distance between every two adjacent concrete walls, concrete dividing the tank into sections;

H - height of the section;

angle of the conical tapering down open the pipes greater heights than the height of the sections, the creation of reinforced concrete slabs holes perforated pipes and along the longitudinal axis of reinforced concrete slabs conical tapering from top to bottom of the hole, the conical tapering from top to bottom of holes thermoplastic material, using as a means of fill, solid mixture of non-radioactive cement mortar with inorganic sorbent when the content of inorganic sorbent 3 - 50 wt.% the total weight of the mixture, the identification of unfilled cavities in sections, drilling through thermoplastic material of the conical hole and AMERICANIA SRW wells until autopsy revealed not filled cavities, installation in wells technological pipes, heating thermoplastic material of the conical holes to ensure the sealing of the joining places with him technological pipes, cooling of thermoplastic material of the conical holes, the injection of technological pipes identified in the empty cavity of a mixture of non-radioactive cement mortar with inorganic sorbent, heating thermoplastic material of the conical holes, remove from wells technological pipes, cooling of thermoplastic material con the sorbent content of inorganic fillers, extract of a mixture of non-radioactive cement mortar with inorganic sorbent in cavities and wells to the education of her cement stone, heating thermoplastic material of the conical holes before they zaplavlenie, the implementation of radioecological monitoring of buried TRO by sampling from the tank through the perforated pipe and radionuclide analysis, as well as the fact that the angles of the conical tapering from top to bottom of the holes and the distance between every two neighboring tapering from top to bottom conical holes on the concrete lids are equal, and the total number of holes (N) is determined from the relation:

N=L/2H tg of 0.5 ,

where L is the distance between every two adjacent concrete walls, concrete dividing the tank into sections;

H - height of the section;

angle of the conical tapering from top to bottom of the hole.

Increasing the security of the implementation of the proposed method for the environment is achieved through the use of a mixture of cement mortar with inorganic sorbent (vermiculite, bentonite, zeolite), providing sorption localization of radionuclides TRO, as well as by eliminating sections with OMO the Oia radiological control the behavior of radionuclides TRO directly in the sections of concrete tanks is achieved by installing them in perforated pipes greater heights than the height of the section by sampling through the perforated pipe and radionuclide analysis.

Identification of unfilled cavities in sections is provided by ultrasound scanning, and sealing of radionuclides TRO from the environment in the process of liquidation of unfilled cavities is provided by heating thermoplastic material in the conical tapering down the hole.

The amount of inorganic sorbent in his mixture of cement mortar is 3 to 50 wt.% the total weight of the mixture, and when the content of inorganic sorbent is less than 3 wt.% not reliable fixation of radionuclides in cement stone, and when its content is more than 50 wt.% no formation of the cement stone.

Equal to the angles of the conical tapering from top to bottom of holes equal distance between every two adjacent tapering from top to bottom conical holes in concrete slabs, as well as the total number of conical tapering from top to bottom of holes (N) determined from the ratio N = L/2H tg 0,5 to provide access to any point of the volume of each of the sections located at a distance from the bottom of the vessel does not SS="ptx2">

As thermoplastic material used tar, as well as different grades of bitumen.

The method is illustrated by the drawings, is shown in Fig. 1 - 3.

In Fig. 1 presents a General view of a section of concrete tanks in the incision after concreting TRO in the variant with two perforated pipes and two conical tapering from top to bottom holes (side view);

in Fig. 2 presents a top view of the floor slab section with option two tapered holes;

in Fig. 3 presents accommodation options technological pipes inside the concrete section of the vessel.

The inventive method implemented as follows.

In sections 1 concrete tanks install perforated pipe 2, and then in sections 1 concrete tanks placed TRO 3. Then SRW 3 in sections 1 reinforced concrete containers filled with a mixture of non-radioactive cement mortar with inorganic sorbent, in the process of aging which leads to the formation of a cement stone 4 and unfilled cavities 5. Filled americanme TRO section 1 concrete tanks concrete cover slabs with 6 fulfilled in them holes 7 materialam. After closing sections 1 concrete capacity by ultrasonic scanning americanna TRO 3. Identified unfilled cavity 5 is opened by drilling through the filled thermoplastic material, a conical tapering from top to bottom of the hole 8 and AMERICANIA TRO 3, then in wells place technological pipe 9 and is heated thermoplastic material to provide sealing it places docking with the process pipe 9. Technological pipes 9 are pumping a mixture of non-radioactive cement mortar with inorganic sorbent to fill it revealed cavities 5. Then heat thermoplastic material is removed from the wells technological pipe 9, is cooled thermoplastic material, fill the wells non-radioactive cement mortar with inorganic sorbent and zapravljajut holes in thermoplastic material of the conical tapering from top to bottom of hole 8. Later in the process of long-term endurance exercise radioecological monitoring of radionuclides americanna TRO by periodic sampling of perforated pipes 2 and radionuclide analysis.

As a result of tests claimed the TRO on average 1 - 2 orders of magnitude higher than in the method prototype.

Literature

1. Sobolev, I. A., Homchick L. M. DISPOSAL of RADIOACTIVE WASTE AT CENTRALIZED POINTS. - M.: Energoatomizdat, 1983, S. 85 - 86.

2. Sobolev, I. A., Homchick L. M. DISPOSAL of RADIOACTIVE WASTE AT CENTRALIZED POINTS. - M.: Energoatomizdat, 1983, S. 77 - 78.

3. Sobolev, I. A., Homchick L. M. DISPOSAL of RADIOACTIVE WASTE AT CENTRALIZED POINTS. - M.: Energoatomizdat, 1983, S. 74-75.

1. The method of isolation of solid radioactive waste from the environment, including the creation of underground concrete tanks, separated by concrete walls into sections, covering the inside surfaces of the bottom and walls of reinforced concrete tanks waterproofing composition, structure around the walls of the reinforced concrete tank earthen castle, creating around a clay castle drainage ditches, filling in sections of reinforced concrete containers for solid radioactive waste, fill, solid radioactive waste non-radioactive solution containing cement, poured solid radioactive waste by keeping non-radioactive solution containing the cement to the formation of the cement stone, closing see sections of concrete capacity and long-term exposure americanna solid radioactive waste, characterized in that before completing sections of reinforced concrete containers for solid radioactive waste in them install perforated pipe with a height greater than the height of the sections, as a non-radioactive solution containing cement, a mixture of non-radioactive cement mortar with inorganic sorbent when the content of inorganic sorbent 3 - 50 wt.% the total weight of the mixture, before closing sections of reinforced concrete tanks concrete slabs to create holes perforated pipes located along the longitudinal axis of reinforced concrete slabs, conical, tapering from top to bottom of the hole, which is filled thermoplastic material, identify unfilled cavity in sections, drilling through thermoplastic material of the conical tapering from top to bottom of holes and AMERICANIA solid radioactive waste well before the autopsy revealed unfilled cavities, installed in wells technological pipes, heat thermoplastic material of the conical tapering from top to bottom of holes to ensure the sealing of the joining places with him technological pipes, cool thermoplastic material of the conical tapering from the top to vngo cement mortar with inorganic sorbent, heat thermoplastic material of the conical tapering from top to bottom of the holes, removed from the wells technological tubes, cooled thermoplastic material conical tapering from top to bottom of the holes, fill through these holes well with a mixture of non-radioactive cement mortar with inorganic sorbent, maintain the mixture of non-radioactive cement mortar with inorganic sorbent in cavities and wells to the education of her cement stone, heat thermoplastic material of the conical tapering from top to bottom of the hole before they zaplavlenie, and in the process of long-term exposure americanna solid radioactive waste carry out radioecological monitoring of radionuclides solid radioactive waste by sampling from sections of the vessel through the perforated pipe and radionuclide analysis moreover, the angles of the conical tapering from top to bottom of the holes and the distance between every two adjacent tapering from top to bottom conical holes in concrete floor slabs are equal, and the total number of tapering down from the top of conical holes is determined from the relation

N = L/2Htg0,5,

where N is the total number si partitions, dividing concrete tank in section;

H - height of the section;

angle of the conical tapering from top to bottom of the hole.

2. The method according to p. 1, wherein as the inorganic sorbent use vermiculite, bentonite or zeolite.

3. The method according to p. 1, characterized in that the identification of unfilled cavities by ultrasonic scanning.

4. The method according to p. 1, characterized in that thermoplastic material used tar or different grades of bitumen.

 

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