JP6990608B2 - Water purification device and pedestal - Google Patents

Description

The present invention relates to a gantry for mounting a water purification device and a purification tower of the water purification device, and particularly to a water purification device for purifying stored water in a fuel pool of a reactor building.

A spent fuel pool (hereinafter referred to as a fuel pool) for storing spent fuel and new fuel is installed in the reactor building. Since the fuel pool is open to the operating floor (fuel operation floor), foreign matter and dust (hereinafter referred to as foreign matter, etc.) may fall into the fuel pool. When these foreign substances are activated by the radiation emitted from the spent fuel, the dose on the operating floor increases. Therefore, an underwater vacuum cleaner may be used to remove the foreign substances in the fuel pool. .. Patent Documents 1 and 2 disclose a submersible vacuum cleaner including a suction port, a submersible pump, and a filter. These underwater vacuum cleaners are suspended in the fuel pool by the refueling machine, and the movement of the suction port is performed by the movement of the refueling machine.

Japanese Unexamined Patent Publication No. 59-120899 Japanese Unexamined Patent Publication No. 10-12385

For some reason, it may be necessary to purify the stored water in the fuel pool by a method other than the purification system originally provided in the fuel pool. Even in such a case, it is not impossible to use the underwater vacuum cleaner described in Patent Documents 1 and 2. However, since these underwater vacuum cleaners are operated by a refueling machine, they are not suitable for continuous and semi-permanent removal of foreign substances and the like from pool water. Further, since it is assumed that the device is suspended from a refueling machine and used, it is difficult to increase the size of the device in order to remove more foreign substances and the like. Therefore, in such a case, it is desirable to provide a septic tower inside or outside the fuel pool, which is less restricted in size and can be operated for a long time. However, since the purification part (filter, etc.) of the purification tower needs to be replaced regularly and the purification tower is activated by removing foreign substances, it is desirable to perform this work by remote control as much as possible. The above-mentioned problems more generally apply to the case of purifying water containing radioactive substances stored in a container or pool, and further, regardless of whether or not the purification tower contains radioactive substances, the purification tower is used. This also applies when it is desirable to replace it by remote control.

The present invention provides a water purification device for purifying water to be treated stored in a container or a pool, which can be easily increased in size and can be replaced by a remote control. The purpose is to do.

The water purification device for purifying the water to be treated stored in the container or pool of the present invention is purified by the introduction part of the water to be treated, the purification part for purifying the water to be treated introduced from the introduction part, and the purification part. A replaceable septic tower equipped with a discharge section for discharging the treated water, and a supply section in which the first end is connected to the introduction section from below the introduction section and supplies the treated water to the purification tower. And the pedestal that supports the septic tower, the weight member that is supported by the septic tower and gives the septic tower a downward force in the vertical direction, and the entrance seal provided between the introduction part and the first end of the supply part. It has a material and. The septic tower is supported on the gantry by its own weight, and when the septic tower is supported on the gantry, the inlet sealing material is vertically compressed by the septic tower. The weight member has a circumferentially continuous side wall that covers at least a portion of the side surface of the purification tower and a top plate that is connected to the top of the side wall and is supported by the top surface of the purification tower.

According to the present invention, as long as the water to be treated is supplied from the supply unit, there are no restrictions on the installation location or structure of the septic tower. Therefore, a septic tower of an appropriate size can be used according to the application. Further, the connection between the septic tower and the supply unit is not a general flange connection, but is performed by compressing the inlet sealing material in the vertical direction by the septic tower. That is, the septic tower and the supply section can be connected by a simple operation of moving the septic tower relative to the supply section in the vertical direction. Such an operation can be easily performed by remote control. Therefore, according to the present invention, it is a water purification device that purifies the water to be treated stored in a container or a pool, and it is easy to increase the size of the water, and the purification unit can be replaced by remote control. Purification equipment can be provided.

It is a schematic cross-sectional view which shows an example of a reactor building. It is sectional drawing of the water purification apparatus. It is the top view of the water purification apparatus seen from the line AA of FIG. 2, and the sectional view of the water purification apparatus cut by the line BB of FIG. It is sectional drawing of the purification tower. FIG. 4 is a cross-sectional view of a purification tower cut along the line CC of FIG. 4, and a cross-sectional view of a filter cartridge. It is a conceptual diagram which shows the operation of the 1st valve. It is sectional drawing of a gantry. It is sectional drawing of a weight member. It is a conceptual diagram explaining the installation method of a water purification apparatus in a fuel pool. It is a side view of the connection part of a septic tower and a gantry. It is a conceptual diagram which shows the seal by an inlet seal material and an outlet seal material. It is a conceptual diagram which shows the sealing method of the introduction part and the discharge part of a septic tower.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention can be widely applied when purifying water containing radioactive substances stored in a container or pool. In the following embodiment, an example of purifying the stored water of the fuel pool of a nuclear power plant (hereinafter, the stored water of the fuel pool which is the treated water is referred to as pool water) will be described.

First, the fuel pool to which the present invention is applied will be described. FIG. 1 is a schematic cross-sectional view showing an example of a reactor building provided with a fuel pool. Although FIG. 1 shows the reactor building of a boiling water nuclear power plant, the present invention is also applicable to the fuel pool of a pressurized water nuclear power plant and the fuel pool of a site bunker that may be installed on the premises of the power plant. can do. The reactor building 101 includes a reactor pressure vessel 102 containing fuel 103. The fuel 103 is moved from the reactor pressure vessel 102 to the fuel pool 104 for periodic replacement. The fuel pool 104 is a pool opened to the operating floor 105, and refueling is performed by a refueling machine (not shown) traveling on the operating floor 105. The fuel pool 104 is filled with water to shield the radiation emitted from the spent fuel 106, thereby reducing the dose on the operating floor 105. An overhead crane 107 is installed above the operating floor 105. Parts that need to be removed during refueling are lifted by the overhead crane 107 and temporarily placed on the operating floor 105.

The water purification device 1 is installed in the fuel pool 104. The entire water purification device 1 of the present embodiment is submerged in the fuel pool 104. 2 is a cross-sectional view of the water purification device 1, FIG. 3A is a top view of the water purification device 1 as seen from the line AA of FIG. 2, and FIG. 3B is cut along the line BB of FIG. The cross-sectional view of the water purification apparatus 1 is shown. The water purification device 1 has a purification tower 2 for purifying pool water, a gantry 3 for supporting the purification tower 2, and a weight member 4 for preventing the purification tower 2 from floating.

4 is a cross-sectional view of the septic tower 2, FIG. 5 (a) is a cross-sectional view of the septic tower 2 cut along the line CC of FIG. 4, and FIG. 5 (b) is an enlargement of part A of FIG. 5 (a). The figure, that is, the cross-sectional view of the filter cartridge 21 is shown. The purification tower 2 has a cylindrical body plate 201, an upper lid 202, and a bottom plate 203, and a container of the purification tower 2 is formed by these members. An upper support plate 204 parallel to the upper lid 202 is provided below the upper lid 202. An upper space 205 is formed between the upper lid 202 and the upper support plate 204. A filter receiving plate 206 parallel to the bottom plate 203 is provided above the bottom plate 203. A lower space 207 is formed between the bottom plate 203 and the filter receiving plate 206. A filter installation space 208 in which the filter cartridge 21 is installed is formed between the filter receiving plate 206 and the upper support plate 204.

Inside the purification tower 2, more specifically, in the filter installation space 208, a purification unit 21 for purifying the pool water introduced from the introduction unit 203b of the purification tower 2 is housed. The purification unit 21 is a plurality of filter cartridges 21 extending in the vertical direction. In the present embodiment, 18 filter cartridges 21 are provided in one purification tower 2, but the number thereof is not limited to this. As shown in FIG. 5B, the filter cartridge 21 has a mesh-shaped outer cylinder 211, a mesh-shaped core 212 concentric with the outer cylinder 211, and an outer cylinder 211 and a core between the outer cylinder 211 and the core 212. It has a pleated filter 213 provided concentrically with the 212. The pleated filter 213 is a filtration membrane folded into folds. The pool water is introduced into the filter cartridge 21 from the outer cylinder 211, filtered by the pleated filter 213, and the filtered water (hereinafter referred to as purified water) is introduced into the core 212. The lower end of the filter cartridge 21 is supported by the filter receiving plate 206, and the upper end is supported by the upper support plate 204. The upper support plate 204 has a plurality of first openings 204a in which the upper end of the pleated filter 213 is supported, and a plurality of second openings located at locations where neither the pleated filter 213 nor the communication pipe 22 described later is installed. An opening 204b is provided. The second opening 204b communicates the upper space 205 with the filter installation space 208. The diameter of the upper support plate 204 is smaller than the inner diameter of the body plate 201, and a gap is provided between the outer circumference of the upper support plate 204 and the body plate 201. The filter receiving plate 206 is provided with a third opening 206a, which is an outlet for purified water, and the lower end of the core 212 of the filter cartridge 21 communicates with the lower space 207 via the third opening 206a. The bottom plate 203 is provided with a fourth opening 203a, which is a purified water discharge portion 203a. Therefore, the third opening 206a communicates with the fourth opening 203a via the lower space 207. The fourth opening 203a communicates with the outside of the purification tower 2.

Inside the purification tower 2, a communication pipe 22 extending vertically in parallel with the filter cartridge 21 is provided. The communication pipe 22 communicates the outside of the purification tower 2 with the upper space 205. The communication pipe 22 is supported by a bottom plate 203, a filter receiving plate 206, and an upper support plate 204. In order to prevent the communication pipe 22 from floating, it is desirable that the communication pipe 22 is welded to at least one of the bottom plate 203 and the filter receiving plate 206. The bottom plate 203 is provided with a fifth opening 203b, which is an introduction portion 203b for pool water, and the lower end of the communication pipe 22 communicates with the outside of the purification tower 2 via the fifth opening 203b. The communication pipe 22 penetrates the filter receiving plate 206 and the upper support plate 204, and the upper end thereof opens into the upper space 205.

To manufacture the purification tower 2, the bottom plate 203 and the filter receiving plate 206 are first welded to the body plate 201, then the communication pipe 22 is inserted inside the body plate 201, and either the bottom plate 203 or the filter receiving plate 206 is formed. Weld. Next, a plurality of filter cartridges 21 are inserted inside the body plate 201. Next, the upper support plate 204 is installed and the filter cartridge 21 is fixed. After that, the upper lid 202 is attached to the body plate 201 and fixed with bolts and nuts. A plurality of bolts 23 that define the distance between the filter receiving plate 206 and the upper lid 202 are provided between the filter receiving plate 206 and the upper lid 202. The bolt 23 is engaged with the nut 29 welded to the upper support plate 204, and the upper support plate 204 can be fixed to the upper lid 202 by rotating the bolt 23 and pressing it against the bottom surface of the upper lid 202. can.

A first valve 24 is provided on the upper lid 202, that is, the top surface of the purification tower 2. As shown in FIG. 6, the first valve 24 is composed of a spherical space 242 provided in the middle of a pipeline 241 extending in the vertical direction and a spherical valve body 243 housed in the spherical space 242. The valve body 243 is smaller than the spherical space 242, but its diameter is larger than the upper and lower openings 244 and 245 of the spherical space 242. Therefore, the valve body 243 can freely move inside the spherical space 242 while being constrained inside the spherical space 242. As will be described later, the purification tower 2 is installed in the fuel pool 104 by suspending it from the fuel pool 104 filled with water. Therefore, in order to suspend the purification tower 2, it is necessary to remove the air inside the purification tower 2 while suspending it and replace the inside with pool water. When the purification tower 2 is in the air, the valve body 243 sits on the peripheral wall of the lower opening 245 by its own weight and closes the lower opening 245 of the spherical space 242, as shown in FIG. 6A. .. However, when the purification tower 2 is suspended from the fuel pool 104, the air inside the purification tower 2 is pressurized by the pool water, and the valve body 243 floats up. As a result, the air inside the purification tower 2 can be evacuated. On the other hand, it is necessary to prevent the pool water introduced inside the purification tower 2 from flowing out to the fuel pool 104 during the operation of the water purification device 1. Since the inside of the purification tower 2 is boosted by the pressure of the submersible pump 5, as shown in FIG. 6B, the valve body 243 sits on the peripheral wall of the upper opening 244 of the spherical space 242, and the spherical space 242 Close the upper opening 244. Therefore, it is prevented that the upper space 205 of the purification tower 2 communicates with the fuel pool 104.

FIG. 7 shows a side view of the gantry 3. The gantry 3 supports the purification tower 2, the inlet pipe 6, the outlet pipe 7, and the submersible pump 5. Therefore, the water purification device 1 is integrated and can be installed in the fuel pool 104 with a single operation. Although the gantry 3 is installed on the floor surface of the fuel pool 104 by its own weight, it may be fixed by fixing means such as anchor bolts. The gantry 3 has a frame structure using L-shaped steel, and more specifically, a bottom frame 31, an upper frame 33, a bottom frame 31 and an upper frame 33 mounted on the floor surface of the fuel pool 104. It has an intermediate plate 32 located in the middle of the above, and a vertical beam 34 extending in the vertical direction and connecting the bottom frame 31, the intermediate plate 32, and the upper frame 33. The intermediate plate 32 constitutes the support surface of the purification tower 2. In this embodiment, since the two purification towers 2 are installed on the gantry 3, six vertical beams 34 are provided.

Referring to FIGS. 2, 3 (b) and 7, the submersible pump 5 is connected to the purification tower 2 by the inlet pipe 6. The inlet pipe 6 has a first end portion 61 and a second end portion 62, and the first end portion 61 has an introduction portion 203b (fifth opening 203b) from below the introduction portion 203b (fifth opening 203b). ), And the second end 62 is connected to the submersible pump 5. As a result, the pool water discharged from the submersible pump 5 can be supplied to the purification tower 2. Further, the purification tower 2 is connected to an outlet pipe 7 for returning the purified water purified by the purification tower 2 to the fuel pool 104. The outlet pipe 7 has a first end portion 71 and a second end portion 72, and the first end portion 71 has a discharge portion 203a (fourth opening 203a) from below the discharge portion 203a (fourth opening 203a). ), And the second end 72 is open to the fuel pool 104. The inlet pipe 6 and the outlet pipe 7 extend in a substantially horizontal direction so as to be adjacent to each other in the space between the bottom frame 31 and the intermediate plate 32. The inlet pipe 6 and the outlet pipe 7 are provided in common to the two purification towers 2. That is, the inlet pipe 6 and the outlet pipe 7 each have rising portions 63 and 73 directly under the purification tower 2, and the rising portions 63 and 73 are connected to the introduction portion 203b and the discharge portion 203a of the purification tower 2, respectively. ..

The pool water is discharged from the submersible pump 5 and is supplied to the fifth opening 203b (introduction portion 203b) of the bottom plate 203 through the inlet pipe 6. The pool water is introduced into the purification tower 2 through the fifth opening 203b and reaches the upper space 205 through the communication pipe 22. The pool water is introduced into the filter installation space 208 through the gap between the outer periphery of the upper support plate 204 and the body plate 201 and the plurality of second openings 204b. The pool water flows down through the filter installation space 208, is introduced into each filter cartridge 21, and is filtered to become purified water. The purified water flows down through the core 212, passes through the third opening 206a of the filter receiving plate 206, the lower space 207, and the fourth opening 203a (discharge portion 203a) of the bottom plate 203, and is outside the purification tower 2. That is, it is discharged to the outlet pipe 7 and finally returned to the fuel pool 104.

The inlet pipe 6 is an example of a supply unit that supplies pool water to the purification tower 2. For example, the outlet of the submersible pump 5 (or other water pressure feeding device to be treated) can be directly connected to the introduction portion 203b (fifth opening 203b). In this case, the supply unit serves as the outlet of the submersible pump 5 (or other water pressure feeding device to be treated), and the inlet pipe 6 can be omitted. When a pump or a water pressure feeding device to be treated is used (diverted) from another device, the supply unit is a pipe for connecting the pump or the water pressure feeding device to be treated to the purification tower 2. The fourth opening 203a (discharge portion 203a) can be opened directly into the fuel pool 104. Therefore, the outlet pipe 7 can also be omitted.

The water purification device 1 further has a weight member 4. FIG. 8 shows a side view of the weight member 4. The weight member 4 is supported by the purification tower 2 and applies a force downward in the vertical direction to the purification tower 2. The weight member 4 has a side wall 41 that is continuous in the circumferential direction and covers the side surface of the purification tower 2, and a top plate 42 that is connected to the top of the side wall 41 and is supported by the top surface of the purification tower 2. The side wall 41 is composed of a weight cylinder 43 that bears most of the weight and a cylindrical support wall 44 that supports the weight cylinder 43, and the weight cylinder 43 is attached to the support wall 44 by welding. When the septic tower 2 is installed in the fuel pool 104, the side wall 41 is not required to have a radiation shielding function, and therefore only a part of the side surface of the septic tower 2 needs to be covered. Further, it is sufficient that the top plate 42 can also form a support surface for supporting the weight member 4 on the purification tower 2, and it is not necessary to cover the entire top surface of the purification tower 2.

The purification tower 2 receives the reaction force of the water flowing through the communication pipe 22. That is, there is a possibility that the upper lid 202 of the purification tower 2 is pushed upward by the water flow ejected upward from the outlet of the communication pipe 22, and the purification tower 2 is lifted. In particular, when the septic tower 2 is installed in the fuel pool 104, the septic tower 2 is easily lifted by the influence of buoyancy. If the material is lifted, not only the possibility of tipping over may occur, but also the sealing performance of the inlet sealing material 8 and the outlet sealing material 9, which will be described later, may deteriorate. The weight member 4 compresses the inlet sealing material 8 and the outlet sealing material 9 in the vertical direction via the purification tower 2, and enhances the sealing performance of the inlet sealing material 8 and the outlet sealing material 9.

Next, a method of installing the water purification device 1 in the fuel pool 104 will be described with reference to FIG. FIG. 9 is an exploded view of the gantry 3, the purification tower 2, and the weight member 4. The gantry 3, the purification tower 2, and the weight member 4 are manufactured separately in advance at the factory. A submersible pump 5, an inlet pipe 6, and an outlet pipe 7 are fixed to the gantry 3. First, the gantry 3 is installed on the floor surface 104a of the fuel pool 104. Hanging metal fittings 331 are provided in the vicinity of the four corners of the upper frame 33 of the gantry 3. The wire is fixed to these hanging metal fittings 331, the wire is hooked on the hook of the overhead crane 107, and the gantry 3 is hung in the fuel pool 104. The gantry 3 is placed on the floor surface 104a of the fuel pool 104 by its own weight. Instead of the overhead crane 107, an auxiliary hoist of a refueling machine, a jib crane, or the like can be used, and these may be permanent or temporary. Hang the underwater camera near the installation position of the gantry 3 in advance so that the gantry 3 is installed in the predetermined position, and fine-tune the installation position of the gantry 3 while checking with the operating floor 105 or a monitor installed in another place. It is preferable to do so.

Next, the purification tower 2 is hung on the gantry 3. A hanging metal fitting 26 is provided at the center of the top surface of the purification tower 2. The wire is fixed to the hanging metal fitting 26, the wire is hooked on the hook of the overhead crane 107, and the purification tower 2 is hung in the fuel pool 104. The horizontal positioning of the purification tower 2 is performed by the first guide member 35. That is, as shown in FIG. 3B, a plurality of first guide members 35 surrounding the purification tower 2 are provided on the upper surface of the intermediate plate 32 of the gantry 3. In this embodiment, four first guide members 35 are provided at 90 degree intervals, but the number and position are not limited thereto. As shown in FIG. 7, the inner edge 35a of the first guide member 35 has an inclined surface that projects inward as it goes downward. Therefore, when the purification tower 2 is suspended on the gantry 3, if the purification tower 2 is displaced horizontally from the correct installation position, the bottom of the purification tower 2 abuts on the inner edge 35a and slides on the inner edge 35a in the horizontal direction. Move to. As a result, the purification tower 2 can be positioned horizontally with respect to the gantry 3. Further, FIG. 10 is a side view of the connection portion between the purification tower 2 and the gantry 3 as viewed from the direction A of FIG. 3 (b). The gantry 3 is provided with a second guide member 36, and the purification tower 2 is formed with a slit 25 that engages with the second guide member 36. The opening width W in the circumferential direction of the slit 25 becomes larger toward the bottom. That is, the two walls of the slits 25 facing each other in the circumferential direction have a slope 25a in the lower half portion. Therefore, when the purification tower 2 is suspended on the gantry 3, if the purification tower 2 is displaced in the circumferential direction from the correct installation position, the second guide member 36 comes into contact with any of the slopes 25a of the slit 25, and the purification tower 2 comes into contact with the slope 25a. 2 moves in the circumferential direction along the slope 25a of the slit 25. As a result, the position of the purification tower 2 in the circumferential direction can be adjusted.

When the septic tower 2 is installed at a predetermined position in a predetermined direction in this way, the septic tower 2 is supported on the intermediate plate 32 of the gantry 3 by its own weight. At the same time, the introduction portion 203b of the purification tower 2 is connected to the first end portion 61 of the inlet pipe 6, and the discharge portion 203a is connected to the first end portion 71 of the outlet pipe 7. FIG. 11A shows a partially enlarged view of the vicinity of the introduction portion 203b and the discharge portion 203a of the purification tower 2. The vicinity of the introduction portion 203b and the vicinity of the discharge portion 203a have the same configuration. Two recesses 203c are provided on the lower surface of the bottom plate 203 of the purification tower 2, and the inlet sealing material 8 and the outlet sealing material 9 are fitted in the two recesses 203c. In FIG. 11A, the illustration of the inlet sealing material 8 (exit sealing material 9) in the recess 203c on the right side is omitted for the sake of clarity. The inlet sealing material 8 and the outlet sealing material 9 are made of a material having an elastic repulsive force such as rubber. When the purification tower 2 is installed on the intermediate plate 32, the inlet sealing material 8 abuts on the first end 61 of the inlet pipe 6, and the outlet sealing material 9 hits the first end 71 of the outlet pipe 7. Contact. That is, the inlet sealing material 8 is provided between the introduction portion 203b and the first end portion 61 of the inlet pipe 6, and the outlet sealing material 9 is provided between the discharge portion 203a and the first end portion 71 of the outlet pipe 7. Will be provided in. At this time, as shown in FIG. 11B, the first end portion 61 of the inlet pipe 6, the first end portion 71 of the outlet pipe 7, the purification tower 2, and the gantry 3 are provided with the purification tower 2. When installed on the intermediate plate 32, the first end 61 of the inlet pipe 6 and the first end 71 of the outlet pipe 7 press the inlet seal material 8 and the outlet seal material 9, respectively, and elastically deform (compress). The positional relationship is adjusted so that it is deformed). The compression amount x of the inlet sealing material 8 and the outlet sealing material 9 is not limited as long as the required sealing performance can be obtained and the soundness of the inlet sealing material 8 and the outlet sealing material 9 can be maintained, but it is preferably about 1 to 2 mm. ..

The seal of the introduction portion 203b and the first end portion 61 of the inlet pipe 6 prevents the pool water from leaking to the fuel pool 104 when the pool water discharged from the submersible pump 5 is supplied to the purification tower 2. The seal of the discharge portion 203a and the first end portion 71 of the outlet pipe 7 prevents leakage of purified water to an unintended position in the fuel pool 104. In the present embodiment, these sealing functions are achieved by compressing the inlet sealing material 8 and the outlet sealing material 9 in the vertical direction by the purification tower 2. That is, the inlet sealing material 8 and the outlet sealing material 9 are compressed by the purification tower 2 when the purification tower 2 is supported on the gantry 3, and the inlet sealing material 8 and the outlet sealing material 9 are further compressed. The compression in the vertical direction can be realized by a simple operation of simply placing the purification tower 2 on the gantry 3. That is, in this embodiment, the bolt and nut fastening operations required when the flange connection is used are unnecessary. Therefore, it becomes easy to install the water purification device 1 in the fuel pool 104 by remote control.

Next, the purification tower 2 is covered with the weight member 4. The wire is fixed to the hanging metal fitting 45 formed on the top surface of the weight member 4, the wire is hooked on the hook of the overhead crane 107, and the weight member 4 is hung in the fuel pool 104 so as to cover the purification tower 2. A plurality of third guide members 37 having the same configuration as the first guide member 35 are formed on the top surface of the gantry 3. The plurality of third guide members 37 are arranged so as to surround the purification tower 2, and when the weight member 4 is suspended so as to cover the purification tower 2, the weight member 4 is placed horizontally with respect to the purification tower 2. Position. In this embodiment, four third guide members 37 are provided at 90 degree intervals, but the number and position are not limited thereto. As shown in FIG. 7, the inner edge 37a of the third guide member 37 has an inclined surface that projects inward as it goes downward. Therefore, when the weight member 4 is suspended so as to cover the purification tower 2, if the weight member 4 is displaced in the horizontal direction from the correct installation position, the bottom portion of the weight member 4 comes into contact with the inner edge 37a and slides on the inner edge 37a. Move horizontally like this. As a result, the weight member 4 can be positioned horizontally with respect to the gantry 3.

The purification tower 2 can be replaced by reversing the above procedure. That is, first, the weight member 4 is lifted by the overhead crane 107. The weight member 4 may be temporarily placed on the operating floor 105 or may be temporarily placed on the floor surface of the fuel pool 104. Next, the purification tower 2 is lifted by the overhead crane 107. Since the activated foreign matter and the like are captured by the filter cartridge 21, the dose of the purification tower 2 is high. Therefore, it is desirable to install the purification tower 2 on the floor surface 104a of the fuel pool 104. Next, the new purification tower 2 is installed on the gantry 3 according to the above procedure, and the weight member 4 is further installed around the purification tower 2 according to the above procedure. These operations can be performed by a simple procedure of lifting and lowering the purification tower 2 and the weight member 4. Therefore, the purification tower 2 can be easily replaced.

Although the present invention has been described above by embodiment, the present invention is not limited to the above-described embodiment. For example, the submersible pump 5 can be installed in the fuel pool 104, and the gantry 3 and the purification tower 2 can be installed in the operating floor 105. In this case, the inlet pipe 6 needs to connect the submersible pump 5 installed in the fuel pool 104 and the purification tower 2 installed in the operating floor 105. Therefore, it is desirable that a part of the inlet pipe 6 is attached to the submersible pump 5, the rest of the inlet pipe 6 is attached to the gantry 3, and both are connected by the operating floor 105. Unlike the case where it is installed in the fuel pool 104, the purification tower 2 is not affected by buoyancy, so that it is easy to secure the sealing performance of the inlet sealing material 8 and the outlet sealing material 9. Therefore, from this point of view, the weight member 4 can be omitted. However, since the water shielding of the purification tower 2 cannot be expected, it is desirable to use the weight member 4 as a shielding member in such an embodiment. In this case, it is desirable that the weight member 4 covers the entire surface of the purification tower 2, and it is desirable that the thickness of the support wall 44 is a thickness necessary for shielding. When the gantry 3 and the septic tower 2 are installed in the air, the gantry 3 and the septic tower 2 can be installed at a position other than the operating floor 105 in the reactor building 101, inside or outside the reactor building 101. Further, when the purification tower 2 is installed in the air, the first valve 24 may be a normal on / off valve. When the submersible pump 5 is started, the first valve 24 is opened, the air in the purification tower 2 is evacuated, and when the water is full, the first valve 24 is closed. When the submersible pump 5 is stopped, the first valve 24 is opened when the filter is replaced, air is introduced into the purification tower 2, and the water in the purification tower 2 is discharged. If remote control is required, the first valve 24 can be an automatic valve.

When the purification tower is installed in the air, as shown in FIG. 4, the introduction portion 203b and the discharge portion 203a of the purification tower 2 may be provided with the second valve 27 and the third valve 28, respectively. The second valve 27 is opened when the introduction portion 203b (fifth opening 203b) of the purification tower 2 is connected to the first end portion 61 of the inlet pipe 6 via the inlet sealing material 8, and the purification tower is opened. When the introduction portion 203b of the purification tower 2 and the first end portion 61 of the inlet pipe 6 are disconnected by being lifted, the 2 is closed. The third valve 28 is opened when the discharge portion 203a (fourth opening 203a) of the purification tower 2 is connected to the first end portion 71 of the outlet pipe 7 via the outlet sealing material 9, and the purification tower is opened. When the discharge portion 203a of the purification tower 2 and the first end portion 71 of the outlet pipe 7 are disconnected by being lifted, the 2 is closed.

Regardless of whether the purification tower 2 is installed underwater or in the air, it is conceivable to store the used purification tower 2 in the air outside the container or the fuel pool 104. When dust and fine particles in the air flow into the purification tower 2 through the introduction section 203b and the discharge section 203a, these dust and fine particles may be captured by the pool water remaining in the purification tower 2 and activated. .. In that case, since it is considered that the air dose around the purification tower 2 increases, the introduction portion 203b (fifth opening 203b) and the discharge portion 203a (fourth opening 203a) of the purification tower 2 may be closed. desirable. FIG. 12A shows the concept of a device for closing the introduction portion 203b and the discharge portion 203a of the purification tower 2. The gantry 111 installed in the air includes a guide member 114 similar to the gantry 3. Therefore, when the purification tower 2 is suspended at a predetermined position inside the gantry 111 by a crane or the like, the purification tower 2 can be accurately positioned by the guide member 114. A lid plate mounting base 112 is installed in the center of the lower part of the base 111, and a lid plate 113 formed of a magnet is placed on the upper surface thereof. The lid plate 113 has a shape that covers the introduction portion 203b and the discharge portion 203a. The lid plate mounting base 112 has an upper plate 112a on which the lid plate 113 is placed, and a side wall 112b that is attached around the upper plate 112a and supports the upper plate 112a. The upper surface of the upper plate 112a is slightly lower than the top of the side wall 112b, and the lid plate 113 is placed in a shallow recess formed by the upper plate 112a and the side wall 112b. The top of the side wall 112b is lower than the upper surface of the lid plate 113 mounted on the upper plate 112a, so that interference between the purification tower 2 and the lid plate mounting base 112 when the purification tower 2 is suspended is prevented. The bottom plate 203 is made of a ferromagnetic material such as steel. Therefore, when the purification tower 2 is suspended by a crane or the like and the bottom plate 203 is brought into contact with the lid plate 113, the lid plate 113 is attracted to the bottom plate 203 by magnetic force, and the introduction portion 203b (fifth opening 203b) of the purification tower 2 is attracted to the bottom plate 203. And the discharge portion 203a (fourth opening 203a) is closed. According to the present embodiment, the introduction unit 203b and the discharge unit 203a can be closed by remote control with a crane even in an environment with high radiation.

FIG. 12 (b) shows another embodiment. In the present embodiment, female threads 121 are formed on the inner surfaces of the introduction portion 203b (fifth opening 203b) and the discharge portion 203a (fourth opening 203a) of the purification tower 2. By screwing the plug or bolt 122 having the male screw 123 formed on the outer peripheral surface into the introduction portion 203b and the discharge portion 203a while rotating the plug or the bolt 122, the introduction portion 203b and the discharge portion 203a of the purification tower 2 are closed. In order to easily screw in the bolt 122, the purification tower 2 may be laid on its side in advance. By using a jig that can be remotely controlled for screwing in the bolt 122, the introduction unit 203b and the discharge unit 203a can be closed by remote control even in an environment with high radiation, as in the above embodiment.

In the embodiment shown in FIG. 12, when the purification tower 2 is lifted from the gantry 3, the introduction portion 203b and the discharge portion 203a are separated from the inlet sealing material 8 and the outlet sealing material 9, and the water inside the purification tower 2 may leak. There is sex. In this case, a drain nozzle may be provided at the bottom of the purification tower 2, and a temporary pipe or a temporary tube provided with a valve can be connected to the drain nozzle. The end of the temporary pipe or tube is connected to the container. When the septic tower 2 is installed on the operating floor 105, the end of the temporary pipe or the temporary tube may be connected to the fuel pool 104 and the pool water inside the septic tower 2 may be returned to the fuel pool. By opening the valve, the water inside the purification tower 2 can be almost drained. The valve may be an automatic valve or a manual valve that can be attached to a jig that can be remotely controlled.

Although the above-described embodiment purifies pool water, the water purification device of the present invention does not have such properties as radioactive treated water other than pool water, treated water containing poisonous substances, deleterious substances, and the like. It can also be applied to the treatment of water to be treated. Further, the present invention is also suitable when the purification tower needs to be replaced in a situation where humans cannot easily approach, such as in a radioactive environment or a toxic gas environment, although the treated water itself does not have radioactivity or toxicity. Can be applied.

1 Water purification device 2 Purification tower 21 Purification unit (filter cartridge)
24 1st valve 25 Slit 27 2nd valve 28 3rd valve 203 Bottom plate 203a Discharge part 203b Introductory part 203c Recessed 3 pedestal 35 1st guide member 36 2nd guide member 37 3rd guide member 4 Weight member 41 Side wall 42 Top plate 5 Submersible pump 6 Inlet piping (supply part)
61 The first end of the inlet pipe 62 The second end of the inlet pipe 7 The outlet pipe 71 The first end of the outlet pipe 72 The second end of the outlet pipe 8 The inlet seal material 9 The outlet seal material 104 Fuel pool

Claims (8)

A water purification device that purifies the water to be treated stored in a container or pool.
An interchangeable purification tower including an introduction unit for water to be treated, a purification unit for purifying the water to be treated introduced from the introduction unit, and a discharge unit for discharging the water to be treated purified by the purification unit. When,
A supply unit in which the first end portion is connected to the introduction portion from below the introduction portion and supplies water to be treated to the purification tower.
The pedestal that supports the purification tower and
A weight member that is supported by the purification tower and exerts a downward force in the vertical direction on the purification tower.
It has an inlet sealing material provided between the introduction portion and the first end portion of the supply portion.
The purification tower is supported on the gantry by its own weight, and when the purification tower is supported on the gantry, the inlet sealing material is vertically compressed by the purification tower.
The weight member has a circumferentially continuous side wall that covers at least a part of the side surface of the purification tower, and a top plate that is connected to the top of the side wall and is supported by the top surface of the purification tower. Device. The purification tower is supported by the gantry by being suspended on the gantry, and the gantry positions the purification tower horizontally with respect to the gantry when the purification tower is suspended on the gantry. The water purification apparatus according to claim 1 , further comprising a plurality of first guide members surrounding the purification tower. The gantry has a second guide member for aligning the circumferential position of the purification tower when the purification tower is suspended on the gantry, and the purification tower engages with the second guide member. The water purification device according to claim 2 , which has a matching slit. The gantry is a plurality of third guide members surrounding the purification tower for horizontally positioning the weight member with respect to the purification tower when the weight member is suspended so as to cover the purification tower. The water purification apparatus according to any one of claims 1 to 3 . The purification tower has a bottom plate on which the introduction portion and the discharge portion are formed, a recess is provided on the lower surface of the bottom plate, and the inlet sealing material is fitted in the recess, any of claims 1 to 4 . The water purification device according to item 1. The water purification device according to any one of claims 1 to 5 , wherein the water to be treated contains a radioactive substance. The water purification device according to any one of claims 1 to 6 , wherein the purification tower has a first valve on the top surface thereof that allows air to pass through and shuts off water. The purification tower according to any one of claims 1 to 7 and having a bottom plate made of a ferromagnetic material on which the introduction portion and the discharge portion are formed is used for storing the purification tower outside the container or the pool. A pedestal having a lid plate made of a magnet, which is attracted to the bottom plate from below the bottom plate and closes the introduction portion and the discharge portion.

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