JP2014071107A - Radioactive contaminated material storage facility and construction method thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage facility for storing safely and in a large quantity a radioactive contaminated material composed of a surface layer soil, debris, sludge, a burned ash or the like in a region which are contaminated by radioactive fine particles quickly at a low cost.SOLUTION: The storage facility includes: a domy structure formed by connecting corrugated steel plates; a base supporting the domy structure; and a wall-partition structure provided with an interval from the domy structure inside the domy structure. The wall-partition structure is composed of a wall-like body surrounding a prescribed area of the interior of the domy structure. The domy structure is composed of a combination of hyperbolic sheets formed by bending the corrugated steel plates at a prescribed curvature in a longitudinal direction. A radiation shield material may be interposed between the domy structure and the wall-partition structure.

Description

  The present invention provides a wide sealed space capable of storing a large amount of radioactive pollutants composed of surface soil, debris, sludge, incinerated ash, etc. in a region contaminated by radioactive fine particles released in an accident at a nuclear power plant. The present invention relates to a radioactive pollutant storage facility having a capability of shielding and reducing radiation emitted from radioactive contaminants so as not to go out of the facility, and a construction method thereof.

  On March 11, 2011, the Fukushima Daiichi Nuclear Power Station was destroyed by a strong earthquake and large tsunami that occurred off the Tohoku region of Japan, and a large amount of radioactive fine particles were released from the Fukushima Daiichi Nuclear Power Station. The entire area, especially the area surrounding the Fukushima Daiichi NPS, has been extensively contaminated with radioactive particles.

  Local governments that have been contaminated by radioactive particulates collect radioactive pollutants such as surface soil, debris, sludge, incinerated ash, etc. in the contaminated area and isolate them from the residents' residential areas. Trying to protect the health of the inhabitants.

  For this reason, local governments in the Tohoku region, especially local governments around the Fukushima Daiichi NPS, carry large amounts of radioactive pollutants such as surface soil, rubble, sludge, or incinerated ash in areas contaminated with radioactive fine particles. The amount of this radioactive pollutant is likely to increase in the future.

  This large amount of radioactive pollutant emits radiation that is higher than normally detected in nature, so it must be kept isolated from the population so that it does not adversely affect the health of the population.

And if this large amount of radioactive pollutant is deposited as it is, there is a possibility that it will be dusted by the wind and scattered in the surrounding area, or it may penetrate into the underground with rainwater and contaminate the groundwater,
A large, sealed storage facility must be built and this large amount of radioactive contaminants must be quickly isolated and stored from the outside world.

  Therefore, JFE Building Materials Co., Ltd., one of the present patent applicants, has proposed a radioactive pollutant storage facility in Japanese Patent Application No. 2011-286591.

  As shown in FIG. 6, this radioactive pollutant storage facility includes a dome-shaped structure 100 and a base 102 that supports the lower portion of the dome-shaped structure 100. The dome-shaped structure 100 includes an outer shell 100a and an outer shell 100a. An inner shell 100b formed inside the shell 100a and a radiation shielding material 104 inserted in a gap between the outer shell 100a and the inner shell 100b. The outer shell 100a and the inner shell 100b are corrugated steel plates (deck plates). , Corrugated sheets, folded plates, liner plate sheets, etc.) are formed by connecting structural materials formed by bending the longitudinal direction with a predetermined curvature.

  As shown in FIG. 7, this radioactive pollutant storage facility forms an inner shell 100b with a predetermined gap inside the outer shell 100a, and a radiation shielding material 104 in the gap between the outer shell 100a and the inner shell 100b. The construction of a radioactive pollutant storage facility having a structure that is easier to construct has been desired because the construction is somewhat time-consuming to construct and requires a lot of cost to construct.

  Further, in this radioactive pollutant storage facility, the ability to shield radiation is determined by the radiation shielding material 104. Therefore, when the contamination level of the stored radioactive contaminant 106 is not determined, the radioactive contaminant having the highest contamination level is stored. The thickness of the radiation shielding material 104 must be determined on the assumption of storage of the 106, and when the radioactive contamination 106 having a low contamination level is stored, the radiation shielding material 104 is costly wasted. there were.

  In addition, the radioactive pollutant storage facility has pressure due to the load of the radioactive pollutant 106 stored close to the dome-shaped structure 100, and collapse of a flexible container bag (flexible bag) containing the radioactive pollutant 106. For example, the dome-shaped structure 100, particularly the lower part thereof, may be partially deformed or damaged. If the entire dome-shaped structure 100 is formed of a thick corrugated steel plate so that the dome-shaped structure 100 is not deformed or damaged, there is a problem that the construction cost of the radioactive pollutant storage facility is increased.

Japanese Patent Publication No. 5-51120 Japanese Examined Patent Publication No. 3-27080 Japanese Patent No. 3918648 Japanese Patent No. 4356252

Ministry of the Environment “Basic Concept of Interim Storage Facilities Necessary for Dealing with Environmental Pollution due to Radioactive Substances Associated with TEPCO Fukushima Daiichi Nuclear Power Station Accident” October 29, 2011

  The problem to be solved by the present invention is, for example, to provide a large storage facility for safely storing a large amount of radioactive pollutants that have been carried by local governments in the Tohoku region, quickly and inexpensively.

  In the present invention, radioactive contaminants contaminated by radioactive materials are stored inside the partition wall structure, and the partition wall structure is covered with a dome-shaped structure, thereby costly to construct the dome-shaped structure. The main feature is that a large amount of radioactive pollutants can be stored safely and at low cost.

  That is, the radioactive pollutant storage facility according to the present invention comprises a partition wall structure for storing radioactive pollutants formed by surrounding a predetermined area for storing radioactive contaminants with a plate-shaped wall, and the partition wall structure. It comprises a dome-shaped structure to be covered and a foundation that supports the dome-shaped structure.

  Here, as the wall body forming the partition wall structure, for example, a corrugated steel plate or a precast concrete plate can be used, but any other structural material can be used as long as it can form a strong wall body. Things may be used.

  The partition wall structure may be covered with a radiation shielding sheet to further shield radiation leaking from the partition wall structure. Examples of the radiation shielding sheet include a sheet-like material made of a material having radiation shielding properties such as lead and tungsten.

  The partition wall structure may be further shielded from radiation leaking from the partition wall structure by applying a radiation shielding paint. Examples of radiation shielding paints include paints containing gadolinium and the like.

  When the wall forming the partition wall structure is a precast concrete plate, the precast concrete plate is further shielded from radiation leaking from the partition wall structure by containing barium, boron, etc. for shielding radiation. You may do it.

  The dome-like structure can be formed by connecting structural members formed by bending corrugated steel sheets in the longitudinal direction with a predetermined curvature. The shape of the dome-shaped structure is arbitrary, and may have a semi-cylindrical shape or a substantially hemispherical shape. The ceiling of the dome-shaped structure may be reinforced by a truss structure, or all or a part of the dome-shaped structure may be movably provided on the foundation.

  The dome-shaped structure may be further shielded against radiation leaking from the dome-shaped structure by applying a radiation shielding paint. Examples of radiation shielding paints include paints containing gadolinium and the like.

  In addition, a gap is provided between the partition wall structure and the dome-like structure, and the gap is filled with healthy soil, sand, or concrete, or a precast concrete plate or a radiation shielding sheet is installed in the gap, and the partition wall You may make it further shield the radiation which leaks from a structure to the circumference | surroundings.

  In addition, radioactive pollutants may be stacked and stored in a flexible container bag, etc., or a water-impervious sheet is laid on the ground surrounded by the partition wall structure, and the radioactive pollutants are separated on the water-impervious sheet. They may be stored in a stack, or they may be mixed and stored.

  In addition, radioactive soil contained inside the partition wall structure is covered with healthy soil, sand, concrete, precast concrete board, radiation shielding sheet, and leaks upward from stored radioactive contaminants. You may make it shield a radiation.

  Moreover, in order to prevent scattering of radioactive pollutants, the upper part of the partition wall structure may be covered with a ceiling material to seal the interior of the partition wall structure. Corrugated steel sheets and precast concrete boards can be used as the ceiling material. If the ceiling material is long, it may be supported by beams.

  In order to widen the space inside the dome-shaped structure, the land where the dome-shaped structure is installed may be excavated to be a semi-underground type or an underground type.

  Further, by covering the partition wall structure and the ceiling material with a water shielding sheet, and covering the ground surrounded by the partition wall structure with a water shielding sheet, radioactive substances in the stored radioactive pollutants It may be leaked by rain water, spring water or ground water so that the underground of the facility or around the facility is not newly contaminated by radioactive substances.

  Moreover, in order to prevent contamination of groundwater by radioactive substances in the radioactive pollutant, the land where the dome-shaped structure is installed may be blocked by a water blocking layer. The water shielding layer is a layer that prevents water from passing through, such as synthetic rubber, synthetic resin, asphalt, bentonite, laminated composite, etc. It can be made of a material such as concrete.

  The radioactive pollutant storage facility described above first constructs a dome-shaped structure, then constructs a partition wall structure inside the dome-shaped structure, and places radioactive contaminants inside the partition wall structure. The partition wall structure may be constructed first, radioactive contaminants may be contained inside the partition wall structure, and the dome-like structure may be constructed outside the partition wall structure later. Good.

  In the present invention, the partition wall structure for storing radioactive pollutants is constructed at a distance from the dome-shaped structure, and there is no fear that pressure due to the load of radioactive pollutants is applied to the dome-shaped structure or its foundation. The dome-like structure and its foundation do not need to be designed in consideration of the load due to radioactive pollutants, and therefore, it is possible to construct a radioactive pollutant storage facility at a low cost.

  In addition, the present invention reduces the radiation level of radioactive pollutants stored by changing the thickness of the partition wall structure or inserting a radiation shielding material between the dome-like structure and the partition wall structure. Therefore, it is not necessary to cost the construction of the dome-like structure for shielding the radiation, so that the radioactive pollutant storage facility can be constructed at a low cost.

  In addition, since the partition wall structure for storing radioactive pollutants is constructed away from the dome-like structure, the present invention is loaded with unstructured radioactive rubble, radioactive sludge incineration ash, decontaminated soil, etc. Even if stored in a state, there is no worry of pressure from the load of radioactive pollutants on the dome-like structure and its foundation, and therefore, irregular shaped radioactive debris, radioactive sludge incineration ash, decontaminated soil, etc. are piled up as they are There is an effect that it can be stored in.

  In addition, if radioactive contaminants are packed inside a partition wall structure and packed in a flexible container bag, etc., the flexible container bag is supported by the partition wall structure. There is an effect that it can be prevented.

  Further, according to the present invention, when the partition wall structure is formed by connecting corrugated steel plates or precast concrete plates, the partition wall structure can be easily assembled or disassembled, and the shape of the partition wall structure -There is an effect that capacity and quantity can be selected as appropriate.

  Further, according to the present invention, when the upper part of the partition wall structure is covered with a ceiling material (corrugated steel plate or precast concrete plate) or the stored item is covered with a radiation shielding sheet, the stored item is scattered inside the dome-like structure. And the diffraction of radiation from the upper part of the structure can be suppressed.

  In addition, when the stored item inside the partition wall structure is separated by a water shielding sheet, the present invention can be applied to rainwater, spring water, groundwater, etc. There is an effect that it can be prevented from being newly contaminated with radioactive substances.

  Further, in the present invention, when radioactive contaminants are accommodated inside the partition wall structure, and then a dome-like structure is constructed outside the partition wall structure, radioactive contaminants are placed inside the partition wall structure. Since the periphery of the partition wall structure is open when housed, the partition wall structure is constructed from above the partition wall structure using a heavy machine such as a crane in a dome-like structure or a crane car (unic car). There is an effect that a large amount of radioactive pollutants can be easily contained in the body.

  Further, according to the present invention, when the radioactive contaminant is accommodated inside the partition wall structure and then a dome-like structure is constructed outside the partition wall structure, the periphery of the partition wall structure is opened. Therefore, there is an effect that the radiation shielding material can be easily covered on the radioactive pollutant by using a heavy machine such as a crane in a dome-like structure or a crane truck (unic car).

  Moreover, this invention has the effect that when the dome-shaped structure is continuously formed in the longitudinal direction, the dome-shaped structure can be easily expanded and extended in the longitudinal direction.

  In addition, this invention is more aesthetic than the example of on-site storage / temporary storage shown in Chapter 4 “Guidelines for Storage of Removed Soil” in the Guidelines for Decontamination of the Ministry of the Environment. Excellent visibility as a temporary storage.

  In addition, for example, when the dome-shaped structure is constructed so as to cover the on-site storage / temporary storage site as shown in the guideline, the present invention has the effect of further reducing the radiation dose and suppressing the scattering. At the same time, it is possible to expect effects such as embankment, scattering of sheets, and suppression of rainwater intrusion.

FIG. 1 is an explanatory view showing an example of a radiation pollutant storage facility according to the present invention. FIG. 2 is an explanatory diagram showing an example of use of the radiation contaminant storage facility of FIG. FIG. 3 is an explanatory view showing another example of the radiation pollutant storage facility according to the present invention. FIG. 4 is a process diagram showing an example of a construction method for a radiation pollutant storage facility according to the present invention. FIG. 5 is a process diagram showing another example of the construction method of the radiation pollutant storage facility according to the present invention. FIG. 6 is an explanatory view showing an example of a conventional radiation pollutant storage facility. FIG. 7 is an explanatory view showing a cross-sectional structure of a portion A in FIG.

  Providing a facility for safe and large-scale storage of radioactive pollutants consisting of surface soil, debris, sludge, or incinerated ash, etc. in areas contaminated by radioactive fine particles released in the event of a nuclear power plant This was achieved without compromising the radiation shielding capability by a simple configuration in which a partition wall structure for storing radioactive contaminants was formed inside the dome-shaped structure.

  FIG. 1 is an explanatory diagram showing an example of a radiation contaminant storage facility according to the present invention, and FIG. 2 is an explanatory diagram showing an example of use of the radiation contaminant storage facility of FIG. In these drawings, reference numeral 10 denotes a partition wall structure for storing radioactive pollutants. The partition wall structure 10 is entirely covered with a dome-shaped structure 12, and the dome-shaped structure 12 is supported by a foundation 14. .

  The partition wall structure 10 is formed by surrounding a predetermined area for storing the radioactive contaminant 16 with a plate-like wall 10a. As the wall body 10a that forms the partition wall structure 10, for example, a corrugated steel plate or a precast concrete plate can be used, but any other material can be used as long as it is a structural material that can form a strong wall body. May be used.

  The partition wall structure 10 may be covered with a radiation shielding sheet to further shield radiation leaking from the partition wall structure. Examples of the radiation shielding sheet include a sheet-like material made of a material having radiation shielding properties such as lead and tungsten.

  A radiation shielding paint may be applied to the partition wall structure 10 to further shield radiation leaking from the partition wall structure 10 to the outside. Examples of radiation shielding paints include paints containing gadolinium and the like.

  When the wall body 10a forming the partition wall structure 10 is a precast concrete board, the precast concrete board contains barium, boron or the like that shields radiation so as to further shield radiation leaking from the partition wall structure. It may be.

  The dome-like structure 12 is formed by connecting plank sheets formed by bending a corrugated steel sheet having a relatively large thickness (for example, about 2.3 mm to 6 mm) with a predetermined curvature in the longitudinal direction. The shape of the dome-shaped structure 12 is arbitrary, and may have a kamaboko shape or a substantially hemispherical shape. When the dome-shaped structure 12 has a kamaboko shape, the dome-shaped structure 12 can be easily expanded and extended in the longitudinal direction as needed.

  The ceiling of the dome-shaped structure 12 may be reinforced by a truss structure. The dome-shaped structure 12 is basically fixed on the foundation 14, but all or part of the dome-shaped structure 12 may be movably provided on the foundation 14.

  The dome-shaped structure 12 may be further shielded from radiation leaking to the outside from the dome-shaped structure 12 by applying a radiation shielding paint. Examples of radiation shielding paints include paints containing gadolinium and the like.

  When the radiation intensity of the radioactive contaminant 16 stored inside the partition wall structure 10 is high and a considerable amount of radiation leaks from the partition wall structure 10, as shown in FIG. 2, the partition wall structure 10 is filled with a radiation shielding material 20 made of healthy soil, sand, concrete, or the like in a gap 18 between the dome-shaped structure 12 and a precast concrete plate or a radiation shielding sheet is installed in the gap 18 Radiation leaking from the structure 10 to the surroundings may be further shielded before the dome-shaped structure 12.

  The radioactive pollutant 16 may be stacked and stored in a flexible container bag or the like, or a water shielding sheet is laid on the ground surrounded by the partition wall structure 10, and the radioactive pollutant 6 is placed on the water shielding sheet. It may be stored in bulk, or these may be mixed and stored.

  The radioactive contamination 16 stored inside the partition wall structure 10 is covered with a radiation shielding material 22 such as healthy soil, sand, concrete, precast concrete board, radiation shielding sheet, etc., and stored. The radiation leaking upward from the substance 16 may be shielded.

  Further, in order to prevent the radioactive contaminant 16 from scattering, the upper part of the partition wall structure 10 may be covered with a ceiling material 24 to seal the interior of the partition wall structure 10. As the ceiling member 24, a corrugated steel plate or a precast concrete plate can be used. When the ceiling member 24 is long, the middle may be supported by a beam.

  FIG. 3 is an explanatory view showing another example of the radiation pollutant storage facility according to the present invention. As shown in this figure, the dome-shaped structure 10 is installed to widen the space inside the dome-shaped structure 10. The partition wall structure 10 may be provided in a semi-underground type by excavating the land that is provided, or may be provided in an underground type.

  Further, the partition wall structure 10 and the ceiling material 24 are covered with a water shielding sheet, and the ground surrounded by the partition wall structure 10 is covered with the water shielding sheet, so that the radioactivity in the stored radioactive pollutant 16 is increased. The material may be leaked by rain water, spring water or ground water, and the underground of the facility or around the facility may not be newly contaminated by radioactive material.

  Moreover, in order to prevent the contamination of the groundwater by the radioactive substance in the radioactive pollutant 16, the land where the dome-shaped structure 10 is installed may be blocked by a water blocking layer. The water shielding layer is a layer that prevents water from passing through, such as synthetic rubber, synthetic resin, asphalt, bentonite, laminated composite, etc. It can be made of a material such as concrete.

  Next, the construction method of the radioactive pollutant storage facility mentioned above is demonstrated, referring FIG. 4, FIG.

  As shown in FIG. 4, the radioactive pollutant storage facility described above basically has a foundation 14, a dome-like structure 12 is constructed on the foundation 14, and the interior of the dome-like structure 12 is partitioned. The wall structure 10 is constructed, the radioactive contaminant 16 is stored in the partition wall structure 10, the radiation shielding material 22 is coated on the partition wall structure, and the radiation shielding material 20 is provided in the gap 18 if necessary. Is generally filled.

  However, as shown in FIG. 5, the partition wall structure 10 is first constructed, the radioactive contaminant 16 is accommodated inside the partition wall structure 10, and the radiation shielding material 22 is coated on the partition wall structure. Thereafter, the dome-shaped structure 12 may be constructed outside the partition wall structure 10.

  When the radioactive pollutant 16 is accommodated inside the partition wall structure 10 and then the dome-shaped structure 12 is constructed outside the partition wall structure 10, the radioactive contaminant 16 is placed inside the partition wall structure 10. Since the periphery of the partition wall structure 10 is open when accommodated, radioactive contaminants 16 can be easily introduced into the partition wall structure 10 from above the partition wall structure 10 using a heavy machine such as a crane. There is an advantage that it can be accommodated.

  Although this facility is a facility for storing radioactive pollutants, it is used for storing stored items that cause lateral pressure at the bottom when they are piled up, or stored items that are likely to collapse when stacked. Is also applicable.

DESCRIPTION OF SYMBOLS 10 Partition wall structure 10a Wall body 12 Dome-shaped structure 14 Base 16 Radioactive contaminant 18 Crevice 20 Radiation shielding material 22 Radiation shielding material 24 Ceiling material

Claims (14)

  A dome-like structure formed by connecting corrugated steel plates, a foundation for supporting the dome-like structure, and a partition wall structure provided inside the dome-like structure at a distance from the dome-like structure; A radioactive pollutant storage facility, wherein the partition wall structure is a wall-like body surrounding a predetermined area inside the dome-like structure.   2. The radioactive pollutant storage facility according to claim 1, wherein the dome-shaped structure is formed by connecting arc-shaped sheets formed by bending corrugated steel sheets in a longitudinal direction with a predetermined curvature. .   The radioactive pollutant storage facility according to claim 1 or 2, wherein the dome-like structure is covered with a radiation shielding sheet or a radiation shielding paint.   The radioactive pollutant storage facility according to any one of claims 1 to 3, wherein the dome-shaped structure is formed continuously in a longitudinal direction.   The radioactive pollutant storage facility according to any one of claims 1 to 4, wherein the partition wall structure is formed by connecting corrugated steel plates or precast concrete plates.   6. The radioactive contaminant storage facility according to claim 1, wherein the partition wall structure is covered with a radiation shielding sheet or a radiation shielding paint.   The radioactive pollutant storage facility according to claim 1, wherein a radiation shielding material is interposed between the dome-shaped structure and the partition wall structure.   The radioactive contaminant storage facility according to any one of claims 1 to 7, wherein an upper portion of the radioactive contaminant in the partition wall structure is covered with a radiation shielding material.   The radioactive pollutant storage facility according to any one of claims 1 to 8, wherein an upper portion of the partition wall structure is covered with a ceiling material.   The radioactive pollutant storage facility according to any one of claims 1 to 9, wherein the radioactive pollutant in the partition wall structure is isolated from the surroundings by a water shielding sheet.   The radioactive pollutant storage facility according to any one of claims 1 to 10, wherein the partition wall structure is formed in a semi-basement or a basement.   The radioactive pollutant storage facility according to any one of claims 1 to 11, wherein all or a part of the dome-like structure is movably provided on the foundation.   The partition wall structure is constructed in a place where radioactive contaminants are stored, the radioactive contaminants are accommodated inside the partition wall structure, and the partition wall structure is covered outside the partition wall structure. A method for constructing a radioactive pollutant storage facility characterized by constructing a dome-like structure.   The radiation shielding material is coated on the radioactive pollutant before the dome-like structure is constructed so as to cover the partition wall structure outside the partition wall structure. How to build the radioactive pollutant storage facility described.

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