JP2017201260A - Radioactive waste storage facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radioactive waste storage facility capable of cooling vitrified waste including low-level radioactive waste without forcibly making cooling air flow by using a power source.SOLUTION: A radioactive waste storage facility includes a building having a storage area in which an introduction opening 2d for introducing cooling air and discharge openings 2f for discharging the cooling air communicate with each other inside. In the storage area, a low-level radioactive solid waste storage area Rb for storing low-level radioactive solid waste and a high-level radioactive vitrified waste storage area Ra for storing high-level radioactive vitrified waste as vitrified waste including high-level radioactive waste are formed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radioactive waste storage facility.

  At a nuclear power plant, radioactive waste is generated due to operation and dismantling of the facility. Such radioactive waste is classified into high-level radioactive waste including spent fuel and low-level radioactive waste other than high-level radioactive waste. Among these, high-level radioactive waste is mixed with, for example, glass, and cooled for a certain period in a radioactive waste storage facility as disclosed in Patent Document 1 as a vitrified body.

  Such high-level radioactive waste has a high calorific value. For this reason, the surface temperature of the vitrified body containing the high-level radioactive waste becomes a high temperature of 200 ° C. or higher. For this reason, in the radioactive waste storage facility disclosed in Patent Document 1, the flow of cooling air is generated without using a power source inside the storage area of the vitrified body due to the draft effect utilizing the amount of heat of the vitrified body. The vitrified body is formed by this flow of cooling air.

JP 11-295492 A

  By the way, low-level radioactive waste is further classified according to the radioactivity level. Among this category, disposal methods for low-level radioactive waste with the highest level of radioactivity are currently being investigated from various angles. As a disposal method of such a low level radioactive waste having a relatively high radioactivity level, for example, like a high level radioactive waste, it is buried after being cooled for a certain period as a solidified body containing a low level radioactive waste. The method is considered.

  However, the calorific value of low-level radioactive waste is usually less than one-tenth that of high-level radioactive waste. For this reason, when the solidified body containing low-level radioactive waste is stored in Patent Document 1, a flow of cooling air due to the draft effect cannot be formed. For this reason, in the case of storing a solidified body containing low-level radioactive waste instead of vitrified body containing high-level radioactive waste in a radioactive waste storage facility simply disclosed in Patent Document 1, In addition, a power source for forcibly forming a cooling air flow is required, which increases the difficulty of management and maintenance.

  The present invention has been made in view of the above-described problems. In a radioactive waste storage facility for storing a solidified body containing low-level radioactive waste as low-level radioactive solid waste, the present invention is compulsory using a power source. The purpose of this invention is to enable cooling of low-level radioactive solid waste without flowing cooling gas.

  The present invention adopts the following configuration as means for solving the above-described problems.

  A first invention is a radioactive waste storage facility for storing a solidified body containing a low-level radioactive waste as a low-level radioactive solid waste, wherein an introduction opening for introducing a cooling gas and an exhaust for discharging the cooling gas are provided. A building having a storage area in communication with the opening, the storage area containing a low-level radioactive solid waste storage area for storing the low-level radioactive solid waste, and a high-level radioactive waste A configuration is adopted in which a high-level radioactive glass solidified body storage region for storing a high-level radioactive glass solidified body that is a glass solidified body is formed.

  According to a second aspect of the present invention, in the first aspect of the present invention, a boundary channel is formed at a boundary portion between the low-level radioactive solid waste storage region and the high-level radioactive glass solid storage region and the cooling gas flows. The structure of having is adopted.

  According to a third invention, in the second invention, a configuration is adopted in which the high-level radioactive vitrified body storage region is enclosed together with the boundary channel and a side channel through which the cooling gas flows is provided.

  A fourth invention is the boundary according to any one of the first to third inventions, wherein the boundary is disposed between the low-level radioactive solid waste storage area and the high-level radioactive vitrified substance storage area and shields radiation. A configuration including a shielding plate is employed.

  According to a fifth invention, in any one of the first to fourth inventions, a high-level radioactive vitrified material housing tube that accommodates a plurality of the high-level radioactive glass solidified materials in a laminated state, and the uppermost high-level radioactive material. A configuration is adopted in which a shielding lid member that is disposed on the glass solidified body and shields radiation is provided.

  According to a sixth invention, in the fifth invention, the shielding lid member has the same outer shape as the high-level radioactive glass solidified body and is accommodated in the high-level radioactive glass solidified material storage tube. Adopt the configuration.

  According to the present invention, in a storage area inside a building, a low-level radioactive solid waste storage area for storing low-level radioactive solid waste, and a high-level radioactive glass that is a solidified glass containing high-level radioactive waste. A high-level radioactive vitrified body storage area for storing the solidified body is formed. For this reason, by storing the high-level radioactive vitrified body in the high-level radioactive vitrified body storage area, the cooling gas is introduced into the storage area from the introduction opening to the discharge opening due to the draft effect due to heat generation of the high-level radioactive vitrified body. Is formed. As a result, the low level radioactive solid waste stored in the low level radioactive solid waste storage area is cooled. Therefore, according to the present invention, in a radioactive waste storage facility for storing a solidified body containing low-level radioactive waste, low-level radioactive solid waste can be discharged without forcibly flowing a cooling gas using a power source. It becomes possible to cool.

It is sectional drawing which shows schematic structure of the radioactive waste storage equipment in one Embodiment of this invention. It is an expansion schematic diagram including a part of storage area with which the radioactive waste storage facility in one Embodiment of this invention is provided. It is the sectional view on the AA line of FIG. It is a longitudinal cross-sectional view which shows typically the schematic structure of the storage pipe arrange | positioned in the high level radioactive vitrified body storage area | region with which the radioactive waste storage facility in one Embodiment of this invention is provided. It is a longitudinal cross-sectional view which shows typically schematic structure of the storage pipe arrange | positioned at the low level radioactive solid waste storage area | region with which the radioactive waste storage facility in one Embodiment of this invention is provided. It is a fragmentary sectional view which shows typically the solidified body stored with the radioactive waste storage equipment in one Embodiment of this invention. It is a fragmentary sectional view which shows typically the shielding cover member with which the radioactive waste storage equipment in one Embodiment of this invention is provided.

  Hereinafter, an embodiment of a radioactive waste storage facility according to the present invention will be described with reference to the drawings. In the following drawings, the scale of each member is appropriately changed in order to make each member a recognizable size.

  FIG. 1 is a cross-sectional view showing a schematic configuration of a radioactive waste storage facility 1 of the present embodiment. 2 is an enlarged schematic view including a part of a storage area provided in the radioactive waste storage facility 1 of the present embodiment, and FIG. 3 is a cross-sectional view taken along line AA of FIG. As shown in any one or a plurality of FIGS. 1 to 3, the radioactive waste storage facility 1 of the present embodiment includes a building 2, a lower plenum forming plate 3, an upper plenum forming plate 4, and a plurality of ventilation pipes 5. A plurality of storage tubes 6, a plug 7, a storage tube lid 8, a flow path forming wall 9, a boundary shielding plate 10, a shielding lid member 11, an upper shielding plate 12, a heat insulating material 13, and a floor. A surface traveling crane 14 is provided.

  The radioactive waste storage facility 1 of this embodiment is a facility for storing a solidified body for a long time while cooling. In addition, although it demonstrates with reference to drawings later, in this embodiment, a solidified body is solid waste (solidified glass etc.) containing radioactive waste (a high level radioactive waste or a low level radioactive waste). And a canister for containing the solid waste.

  The building 2 is a concrete building having a storage area R1. This building 2 is constructed such that the lower part is buried in the ground, and has a floor 2a installed at substantially the same height as the surrounding ground. In the building 2, the space below the floor portion 2a is the above-mentioned storage area R1, and the space above the floor portion 2a is the transfer chamber R2. The storage area R1 is a space for storing the solidified body. In addition, the transfer chamber R2 is a space in which the floor traveling crane 14 is disposed and the solidified body is carried from a solidified body receiving building (not shown) adjacent to the building 2.

  Moreover, the building 2 has the building bottom part 2b and the storage area side wall 2c. As shown in FIG. 1, a storage area R1 is formed by being surrounded by a floor 2a, a building bottom 2b, and a storage area side wall 2c. Further, the building 2 has an introduction opening 2d opened at the top of the side wall of the building 2 and a discharge opening 2f formed at the tip of the chimney 2e protruding upward from the ceiling. The introduction opening 2d is an opening for introducing outside air Y (cooling gas) supplied to the storage area R1 into the building 2. The discharge opening 2f is an opening for discharging the outside air Y discharged from the storage area R1 to the outside of the building 2. Further, the building 2 has an inlet shaft R3 connected from the introduction opening 2d to the lower part of the storage area R1, and an outlet shaft R4 extending from the upper part of the storage area R1 to the discharge opening 2f. As shown in FIG. 1, the inlet shaft R3 and the outlet shaft R4 are arranged on the opposite sides with the storage area R1 in between.

  The lower plenum forming plate 3 is a plate member disposed in the storage area R1, and is fixed to the storage area side wall 2c so that the front and back surfaces are directed in the vertical direction. The lower plenum forming plate 3 is arranged with a certain gap with respect to the building bottom 2b, and forms a lower plenum R5 with the building bottom 2b. The lower plenum R5 is a space provided in the lowermost layer of the storage area R1, and is connected to the inlet shaft R3. Such a lower plenum R5 is a space to which the outside air Y is supplied from the inlet shaft R3, and distributes the supplied outside air Y to each ventilation pipe 5.

  The upper plenum forming plate 4 is a plate member disposed above the lower plenum forming plate 3 in the storage area R1, and is fixed to the storage area side wall 2c so that the front and back surfaces are directed in the vertical direction. The upper plenum forming plate 4 is arranged with a certain gap with respect to the floor portion 2a, and forms an upper plenum R6 between the upper plenum forming plate 4 and the floor portion 2a. The upper plenum R6 is a space provided in the uppermost layer of the storage area R1, and is connected to the outlet shaft R4. Such an upper plenum R6 is a space where the outside air Y is discharged from the plurality of ventilation pipes 5, and guides the outside air Y discharged from the plurality of ventilation pipes 5 to the outlet shaft R4.

  The ventilation pipe 5 is a straight pipe member that communicates from the lower plenum R5 to the upper plenum R6, and is arranged so that the pipe axis faces the vertical direction. The ventilation pipe 5 passes through the lower plenum forming plate 3 and the upper plenum forming plate 4 such that the lower end opening is disposed in the lower plenum R5 and the upper end opening is disposed in the upper plenum R6. It is supported by the upper plenum forming plate 4. The number of such ventilation pipes 5 is the same as the number of storage pipes 6. In the present embodiment, 20 storage tubes 6 are arranged in the lateral direction (left-right direction in FIG. 1) and 4 in the depth direction (up-down direction in FIG. 3), and a total of 80 storage tubes 6 are installed. For this reason, 20 ventilation pipes 5 are similarly arranged in the horizontal direction and 4 in the depth direction, and a total of 80 ventilation pipes are installed. These ventilation pipes 5 guide the outside air Y supplied to the lower plenum R5 to the upper plenum R6. That is, the outside air Y flows through the inside of the ventilation pipe 5 from the lower plenum R5 to the upper plenum R6.

  The storage pipe 6 is a straight pipe member that is suspended and supported by the floor 2 a so that the upper end penetrates the floor 2 a of the building 2 and is inserted into the ventilation pipe 5. The storage pipe 6 has a bottomed shape with an upper end opened and a lower end closed, and the lower end position has a length that is substantially the same as the lower end position of the ventilation pipe 5. The storage tube 6 has a smaller diameter than the ventilation tube 5 so that a space is formed between the storage tube 6 and the inner wall surface of the ventilation tube 5. Such a storage tube 6 stores the solidified body in a laminated state.

  As described above, 20 storage tubes 6 are arranged in the horizontal direction and 4 in the depth direction, and a total of 80 storage tubes 6 are installed. As shown in FIG.2 and FIG.3, some (2 rows by the side of the exit shaft R4) of these storage tubes 6 accommodate the solidified body containing the solidified glass containing a high level radioactive waste. Further, the remaining storage tube 6 stores a solidified body containing low-level radioactive waste. In the following description, a vitrified body containing solidified glass containing high-level radioactive waste is referred to as a high-level radioactive glass solidified body, and a solidified body containing low-level radioactive waste is referred to as a low-level radioactive solid waste. Called.

  Thus, in the radioactive waste storage facility 1 of the present embodiment, two rows on the outlet shaft R4 side among the plurality of storage tubes 6 accommodate the high-level radioactive glass solidified body, and two rows on the outlet shaft R4 side. The other 18 rows except for contain low-level radioactive solid waste. That is, in the radioactive waste storage facility 1 of the present embodiment, the installation area of the storage tubes 6 for two rows from the outlet shaft R4 side is a high-level radioactive glass solidified storage area Ra for storing the high-level radioactive glass solidified substance. It is said that. Further, in the radioactive waste storage facility 1 of the present embodiment, the installation area of the storage pipes 6 for the other 18 rows excluding the two rows from the outlet shaft R4 side has a low level for storing low-level radioactive solid waste. The level radioactive solid waste storage area Rb. That is, the high-level radioactive vitrified storage area Ra and the low-level radioactive solid waste storage area Rb are formed in the storage area R1.

  FIG. 4 is a longitudinal sectional view schematically showing a schematic configuration of the storage tube 6 arranged in the high-level radioactive vitrified storage region Ra. FIG. 5 is a longitudinal sectional view schematically showing a schematic configuration of the storage tube 6 arranged in the low-level radioactive solid waste storage region Rb. As shown in these drawings, the plug 7 is fitted to the upper end portion of the storage tube 6 and seals the region where the solidified body of the storage tube 6 is stored. The storage tube lid 8 is disposed further above the plug 7 and is attached to the storage tube 6 so as to close the open end of the storage tube 6.

  As shown in FIG. 3, the flow path forming wall 9 includes a surrounding wall 9a surrounding the ventilation pipe 5 disposed in the high-level radioactive vitrified substance storage region Ra, a high-level radioactive vitrified substance storage region Ra, and a low-level radioactive substance. And a flat plate wall 9b disposed at a boundary portion with the solid waste storage region Rb. As shown in FIG. 2, the surrounding wall 9a and the flat wall 9b have the lower plenum forming plate 3 and the upper plenum forming plate 4 so that the lower end is located in the lower plenum R5 and the upper end is located in the upper plenum R6. It penetrates and is supported by these lower plenum forming plate 3 and upper plenum forming plate 4.

  As shown in FIG. 3, the surrounding wall 9 a has a rectangular shape when viewed from above, and has four flat wall portions. One of the four flat wall portions is disposed to face the flat plate wall 9b in parallel, and is arranged with a gap between the flat plate wall 9b. The gap between the surrounding wall 9a and the flat plate wall 9b communicates from the lower plenum R5 to the upper plenum R6, and flows the outside air Y from the lower plenum R5 to the upper plenum R6 (hereinafter referred to as boundary flow path R7 and Called). That is, in the radioactive waste storage facility 1 of the present embodiment, the boundary flow path R7 through which the outside air Y flows is provided at the boundary portion between the high level radioactive glass solidified storage region Ra and the low level radioactive solid waste storage region Rb. doing.

  Of the four flat wall portions of the surrounding wall 9a, the remaining three not facing the flat plate wall 9b are arranged in parallel to the storage area side wall 2c, and are located between the storage area side wall 2c. It is arranged with a gap. The gap between the surrounding wall 9a and the storage area side wall 2c communicates from the lower plenum R5 to the upper plenum R6, and flows the outside air Y from the lower plenum R5 to the upper plenum R6 (hereinafter referred to as a side channel). R8). That is, the radioactive waste storage facility 1 of the present embodiment includes the side flow path R8 that surrounds the high-level radioactive vitrified substance storage region Ra together with the boundary flow path R7 and flows through the outside air Y.

  As shown in FIG. 3, the flat plate wall 9b is in contact with the storage area side wall 2c at the end portion as viewed from above. This prevents the outside air Y from leaking from the boundary channel R7 to the low-level radioactive solid waste storage region Rb. Furthermore, the boundary shielding plate 10 is fixed to the flat wall 9b, and the boundary shielding plate 10 is supported.

  The boundary shielding plate 10 is supported by the flat plate wall 9b of the flow path forming wall 9, so that the boundary shielding plate 10 is disposed at a boundary portion between the high-level radioactive glass solid storage region Ra and the low-level radioactive solid waste storage region Rb. . The boundary shielding plate 10 contains lead and iron and shields the radiation. For this reason, in the radioactive waste storage facility 1 of the present embodiment, the boundary shielding plate 10 prevents the radiation emitted from the high-level radioactive glass solidified body from reaching the low-level radioactive solid waste.

  The boundary shielding plate 10 is fixed to the surface of the flat wall 9b of the flow path forming wall 9 on the low level radioactive solid waste storage region Rb side. Thereby, the boundary shielding plate 10 is kept away from the high-level radioactive glass solidified body as compared with the case where the boundary shielding plate 10 is fixed to the surface of the flat wall 9b of the flow path forming wall 9 on the high-level radioactive glass solidified body storage region Ra side. Can be arranged. For this reason, it can suppress that the boundary shielding board 10 is heated by the high level radioactive glass solidified body.

  As shown in FIG. 1, the shielding lid member 11 is accommodated in the storage tube 6 disposed in the high-level radioactive vitrified storage region Ra. The shielding lid member 11 is placed on the uppermost stage of a plurality of high-level radioactive glass solidified bodies that are stacked and stored in the storage tube 6.

  Here, the configuration of the shielding lid member 11 will be described with reference to FIGS. 6 and 7. FIG. 6 is a partial cross-sectional view schematically showing the solidified body X. FIG. 7 is a partial cross-sectional view schematically showing the shielding lid member 11. As shown in FIG. 6, the solidified body X has a canister X1 which is a metal container, and a solid waste X2 accommodated in the canister X1. The canister X1 has a hollow and substantially cylindrical shape, and a grip portion X11 is formed at the top. The gripping part X11 is a part gripped by the floor traveling crane 14, for example. At the bottom of the canister X1, a recess X12 that can accommodate the grip portion X11 is formed. In such a recess X12, when the solidified body X is stacked, the gripping portion X11 of the solidified body X disposed below is accommodated. The solid waste X2 contains radioactive substances, and includes high-level radioactive waste when it is a high-level radioactive vitrified substance, and low-level radioactive waste when it is a low-level radioactive solid waste. It is out.

  As shown in FIG. 7, the shielding lid member 11 has a metal canister 11a, a lid portion 11b, and a weight 11c accommodated inside the canister 11a. The canister 11a has a hollow, substantially cylindrical shape having the same outer shape as the canister X1 of the solidified body X. That is, the canister 11a has a grip 11a1 formed at the top. The gripping part 11a1 is a part gripped by the floor traveling crane 14, for example. At the bottom of the canister 11a, a recess 11a2 that can accommodate the gripping portion 11a1 is formed. When the shielding lid member 11 is placed on the solidified body X, the concave portion 11a2 accommodates the grip part X11 of the lower solidified body X. The shielding lid member 11 having such a canister 11a has the same outer shape as the solidified body X.

  The lid part 11b is a part having a high radiation shielding effect by containing lead or iron, and is disposed inside the canister 11a and in the upper part of the internal space. Such a lid portion 11 b shields radiation emitted upward from the high-level radioactive glass solidified body disposed below the shielding lid member 11. In addition, the arrangement position and shape of the cover part 11b are not limited to what is shown in FIG. For example, the lid portion 11b may be formed so as to cover the entire area of the inner side surface of the canister 11a. Further, the lid portion 11b may be formed integrally with a part of the canister 11a without being separated from the canister 11a. That is, for example, the canister 11a may be locally thickened in the vicinity of the grip portion 11a1, and the thick portion may function as the lid portion 11b.

  The weight 11c is disposed inside the canister X1 and below the internal space. The weight of the weight 11c is set so that the weight of the shielding lid member 11 is the same as the weight of the solidified body X. That is, the weight 11 c adjusts the weight of the shielding lid member 11 so that the weight of the shielding lid member 11 is the same as the weight of the solidified body X.

  In this embodiment, such a shielding lid member 11 is installed only in the high-level radioactive vitrified body storage area Ra. That is, as shown in FIG. 5, in the low-level radioactive solid waste storage region Rb, the solidified body X (low-level radioactive solid waste) is stacked on the storage tube 6 up to the uppermost portion. On the other hand, as shown in FIG. 4, in the high level radioactive glass solidified body storage area Ra, a shielding lid member 11 is installed at the uppermost stage instead of the solidified body X.

  The upper shielding plate 12 is placed on the upper plenum forming plate 4 in the high-level radioactive vitrified substance storage region Ra, and is a plate member that can shield radiation by containing lead or iron. Such an upper shielding plate 12 shields radiation that attempts to enter the upper plenum R6 through the storage tubes 6 in the high-level radioactive vitrified substance storage region Ra. The heat insulating material 13 is affixed to the inner wall surface of the building 2 that forms the upper plenum R6 and the outlet shaft R4 in the vicinity of the high-level radioactive vitrified body storage region Ra. This heat insulating material 13 suppresses that the building 2 is heated by the radiant heat radiated | emitted from a high level radioactive glass solidified body.

  As shown in FIG. 1, the floor traveling crane 14 is disposed on the floor 2 a of the building 2, thereby being disposed in the transfer chamber R <b> 2. The floor traveling crane 14 can travel vertically and horizontally along the floor portion 2a, and is configured to be able to move the solidified body X up and down. Such a floor traveling crane 14 receives the solidified body X from a solidified body receiving building (not shown), conveys the received solidified body X to above the storage pipe 6, and then stores the solidified body X in the storage pipe 6. . Furthermore, in the radioactive waste storage facility 1 of the present embodiment, the floor traveling crane 14 also transports the shielding lid member 11 and stores the shielding lid member 11 in the accommodation tube 6 of the high-level radioactive vitrified substance storage region Ra. To do.

  In the radioactive waste storage facility 1 of this embodiment having such a configuration, the high-level radioactive glass solidified body is laminated on the storage tube 6 installed in the high-level radioactive glass solidified storage area Ra, and the The solidified body X is stored for a long period of time in a state where the low-level radioactive solid waste is laminated and arranged in the storage pipe 6 installed in the level radioactive solid waste storage region Rb. At this time, the air in the storage area R1 warmed by the amount of heat of the high-level radioactive vitrified body becomes light and is discharged to the outside through the outlet shaft R4 through the discharge opening 2f. Further, as the warmed air is exhausted from the discharge opening 2f, the outside air Y flows into the inlet shaft R3 from the introduction opening 2d. The outside air Y that has flowed into the inlet shaft R3 in this way flows from the lower plenum R5 into the ventilation pipes 5, and ascends the ventilation pipes 5 and is guided to the upper plenum R6. In this way, the outside air Y flows from the bottom to the top inside the ventilation pipe 5, whereby the solidified body X stored in the storage pipe 6 is cooled by heat exchange. The outside air Y flowing into the upper plenum R6 from the ventilation pipe 5 is discharged to the outside of the building 2 from the discharge opening 2f through the outlet shaft R4.

  Moreover, the high level radiation is radiated | emitted from the solidified body X (high level radioactive glass solidified body) stored in the high level radioactive glass solidified body storage area | region Ra. Such high-level radiation is prevented from entering the upper plenum R6 by the shielding lid member 11 and the upper shielding plate 12 disposed above the solidified body X. In the conventional radioactive waste storage facility, a maze plate or a louver is installed inside the outlet shaft R4 in order to prevent the radiation from reflecting inside the outlet shaft R4. On the other hand, in the radioactive waste storage facility 1 of the present embodiment, since there is little radiation that enters the upper plenum R6, no maze plate or louver is installed inside the exit shaft R4 that has been conventionally installed.

  Moreover, it is suppressed that the radiant heat radiated | emitted from the solidified body X (high level radioactive glass solidified body) stored in the high level radioactive glass solidified storage area | region Ra is absorbed by the heat insulating material 13, and reaches | attains the building 2. FIG. .

  In the radioactive waste storage facility 1 of the present embodiment described above, the low-level radioactive solid waste storage region Rb for storing the low-level radioactive solid waste in the storage area R1 inside the building 2 and the high A high level radioactive glass solidified body storage region Ra for storing a high level radioactive glass solidified body which is a solidified body containing a level radioactive waste is formed. For this reason, by storing the high-level radioactive glass solidified body in the high-level radioactive glass solidified storage area Ra, the inside of the storage area is directed from the introduction opening 2d toward the discharge opening 2f by the draft effect due to the heat generated by the high-level radioactive glass solidified body. A flow of outside air Y is formed in R1. As a result, the low level radioactive solid waste stored in the low level radioactive solid waste storage area Rb is cooled. Therefore, according to the radioactive waste storage facility 1 of the present embodiment, it is possible to cool the solidified body X containing low-level radioactive waste without forcibly flowing a cooling gas using a power source. .

  Further, in the radioactive waste storage facility 1 of the present embodiment, a boundary flow path that is formed at the boundary portion between the high-level radioactive glass solidified storage region Ra and the low-level radioactive solid waste storage region Rb and through which the outside air Y flows. R7. For this reason, it can suppress that the heat | fever of a high level radioactive vitrified body reaches | attains a low level radioactive solid waste with the external air Y which flows through the boundary flow path R7. For this reason, the cooling effect of a low level radioactive solid waste can be heightened, and generation | occurrence | production of hydrogen by radiolysis can be suppressed in a low level radioactive solid waste.

  In addition, the radioactive waste storage facility 1 of the present embodiment includes a side channel R8 that surrounds the high-level radioactive vitrified substance storage region Ra together with the boundary channel R7 and through which the outside air Y flows. For this reason, the heat | fever of a high level radioactive glass solidification body is transmitted to the storage area side wall 2c of the building 2, and the raise of the temperature of the storage area side wall 2c can be suppressed. For this reason, it becomes possible to suppress deterioration of the building 2.

  In the radioactive waste storage facility 1 of the present embodiment, the boundary shielding plate 10 is disposed between the high-level radioactive glass solidified storage region Ra and the low-level radioactive solid waste storage region Rb and shields radiation. It has. For this reason, it can suppress that the radiation radiated | emitted from the high level radioactive vitrified body reaches | attains a low level radioactive solid waste, and can prevent that the hydrogen by radiolysis is generated in a low level radioactive solid waste. .

  Moreover, in the radioactive waste storage equipment 1 of this embodiment, it arrange | positions in the high level radioactive vitrified body storage pipe (high level radioactive vitrified solid storage area | region Ra) which accommodates a some high level radioactive vitrified solid body in a laminated state. And a shielding lid member 11 which is disposed on the uppermost high-level radioactive vitrified body and shields radiation. For this reason, it can suppress that the high level radiation radiated | emitted from the solidified body X stored in the high level radioactive glass solidified body storage area | region Ra penetrate | invades into the upper plenum R6, and a maze board is carried out inside the exit shaft R4. There is no need to install a louver. For this reason, compared with the case where it installs in a maze board or a louver inside the exit shaft R4, the center of gravity of the building 2 can be lowered, and the seismic strength of the radioactive waste storage facility 1 can be improved. .

  Further, in the radioactive waste storage facility 1 of the present embodiment, the shielding lid member 11 has the same outer shape as the solidified body X, and the storage tube 6 disposed in the high-level radioactive glass solidified body storage region Ra. Contained. For this reason, the shielding lid member 11 can be handled by the floor traveling crane 14 in the same manner as the solidified body X. Therefore, the shielding lid member 11 can be easily installed.

  As mentioned above, although preferred embodiment of this invention was described referring drawings, this invention is not limited to the said embodiment. Various shapes, combinations, and the like of the constituent members shown in the above-described embodiments are examples, and various modifications can be made based on design requirements and the like without departing from the spirit of the present invention.

  For example, in the radioactive waste storage facility 1 of the above-described embodiment, among the plurality of storage tubes 6, two rows on the outlet shaft R4 side contain the high-level radioactive glass solidified body and exclude two rows on the outlet shaft R4 side. The other 18 rows contained low level radioactive solid waste. However, the present invention is not limited to this. For example, you may make it arrange | position the storage tube 6 in which a low level radioactive solid waste is accommodated so that the storage tube 6 in which a high level radioactive glass solidification body is accommodated may be enclosed. That is, the low level radioactive solid waste storage region Rb may be formed so as to surround the high level radioactive glass solidified storage region Ra. In such a case, since the flow of the outside air Y is formed from the periphery of the high-level radioactive vitrified substance storage area Ra toward the high-level radioactive vitrified substance storage area Ra, the low-level radioactive solid is more widely and evenly distributed. The waste can be cooled.

  However, in order to more reliably prevent radiation emitted from the high-level radioactive vitrified body from going out of the building 2 and to enhance the draft effect, as shown in FIG. It is preferable that R4 is formed so as not to overlap with the storage area R1 and close to the high-level radioactive vitrified body storage area Ra. When the high-level radioactive vitrified body storage area Ra is surrounded from the entire periphery, the exit shaft R4 may be formed at a position that does not overlap the storage area R1 when viewed from above and close to the high-level radioactive vitrified body storage area Ra. difficult. For this reason, you may make it form the low level radioactive solid waste storage area | region Rb so that the high level radioactive glass solidification body storage area | region Ra may be enclosed in a U shape.

  Moreover, in the radioactive waste storage facility 1 of the said embodiment, the structure which accommodates eight low level radioactive solid wastes in the lamination | stacking state with respect to the storage pipe | tube 6 was demonstrated. However, the present invention is not limited to this. For example, when the weight of the low-level radioactive solid waste is heavier than that of the high-level radioactive glass solidified body, the number of low-level radioactive solid waste stored in one storage pipe 6 through a lightweight spacer is reduced. Anyway.

  Moreover, in the said embodiment, the structure provided with the boundary flow path R7 and the side part flow path R8 was employ | adopted. However, this invention is not limited to this, For example, it is also possible to employ | adopt the structure which replaces with boundary flow path R7 and side part flow path R8, and installs a heat insulating material.

  Moreover, in the said embodiment, the structure which uses the external air Y as a cooling gas was employ | adopted. However, the present invention is not limited to this, and other gases can be used as the cooling gas.

DESCRIPTION OF SYMBOLS 1 Radioactive waste storage equipment 2 Building 2a Floor part 2b Building bottom part 2c Storage area side wall 2d Introduction opening 2e Chimney part 2f Discharge opening 3 Lower plenum formation board 4 Upper plenum formation board 5 Ventilation pipe 6 Storage pipe 7 Plug 8 Storage pipe lid 9 Flow path forming wall 9a Enclosure wall 9b Flat plate wall 10 Boundary shielding plate 11 Shielding lid member 11a Canister 11a1 Holding part 11a2 Recessed part 11b Lid part 11c Weight 12 Upper shielding board 13 Heat insulating material 14 Floor traveling crane R1 Storage area R2 Transfer room R3 Entrance Shaft R4 Outlet shaft R5 Lower plenum R6 Upper plenum R7 Boundary flow path R8 Side flow path Ra High level radioactive vitrified solid storage area Rb Low level radioactive solid waste storage area X Solidified X1 Canister X11 Grasping part X12 Recessed part X2 Solid waste Object Y Outside air (cooling gas)

Claims (6)

A radioactive waste storage facility for storing solidified material containing low-level radioactive waste as low-level radioactive solid waste,
A building having a storage area inside which is communicated with an introduction opening for introducing cooling gas and a discharge opening for discharging the cooling gas;
The storage area has a low level radioactive solid waste storage area for storing the low level radioactive solid waste, and a high level for storing a high level radioactive glass solidified body that is a glass solid containing high level radioactive waste. A radioactive waste storage facility comprising a radioactive vitrified body storage area.   The radioactive waste according to claim 1, further comprising a boundary channel formed at a boundary portion between the low-level radioactive solid waste storage area and the high-level radioactive vitrified substance storage area and through which the cooling gas flows. Material storage equipment.   The radioactive waste storage facility according to claim 2, further comprising a side channel that surrounds the high-level radioactive vitrified substance storage region together with the boundary channel and through which the cooling gas flows.   4. A boundary shielding plate disposed between the low-level radioactive solid waste storage area and the high-level radioactive vitrified storage area and shielding radiation is provided. 5. The radioactive waste storage facility described in 1. A high-level radioactive vitrified substance storage tube for accommodating a plurality of the high-level radioactive vitrified substances in a laminated state; and
The radioactive waste storage facility according to claim 1, further comprising: a shielding lid member that is disposed on the uppermost high-level radioactive glass solidified body and shields radiation.   6. The radioactive waste storage according to claim 5, wherein the shielding lid member has the same outer shape as the high-level radioactive glass solidified body and is accommodated in the high-level radioactive glass solidified material storage tube. Facility.

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