JP6570936B2 - Filter replacement method for filter - Google Patents

Description

  The present invention relates to a filter replacement method for a filter.

  One means for purifying water containing radioactive solids is filtration with a filter. Patent Document 1 discloses a filter that removes solid matter contained in water by passing water to be purified through a filter.

Japanese Patent Laying-Open No. 2015-85260

  By the way, when the filtration process is performed for a certain period by the filter, the filter is clogged, so that the filter needs to be replaced. The filter is installed in the container of the filter, and when the filter is replaced, an operation of taking out from the container is performed.

  However, the filter used in the filtration process contains radioactive substances by filtering water containing radioactive solids.For this reason, when removing a used filter from the container, There is concern about the exposure of workers who carry out the removal work.

  An object of the present invention is to provide a filter replacement method for a filter that requires an operator to minimize exposure.

  In order to achieve the above object, the present invention provides a filter replacement method for a filter in which water containing radioactive solids is filtered by a filter in a container, and when the filter in the container is taken out, the filtration is performed. In place of the upper lid that shields the inside of the container during the filtration process by the vessel, the temporary cover has a size corresponding to the size of the filter and the same number of openings as the filter and plugs for closing the openings. Including a step of shielding the inside of the container with a lid.

  ADVANTAGE OF THE INVENTION According to this invention, the filter replacement | exchange method of the filter which an operator does not need to be exposed as much as possible can be provided.

  Problems, configurations, and effects other than those described above will be clarified by the following description of embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline of the filter which can apply Example 1 of the filter replacement | exchange method of the filter by this invention, Comprising: The sectional side view shown notched so that the inside can be seen. The figure which shows the state which replaced with the upper cover 6 and the temporary cover 7 on the upper part of the container 1 of FIG. The figure which shows a mode that one of the three filters 2 is taken out from the inside of the container 1 of FIG. The figure which shows a mode that the filter 2 taken out from the inside of the container 1 of FIG. It is a figure which shows the outline of the filter which can apply Example 2 of the filter replacement | exchange method of the filter by this invention, Comprising: The sectional side view shown notched so that the inside can be seen. The figure which shows a mode that the filter 4 taken out from the inside of the container 3 of FIG.

  Hereinafter, a filter replacement method for a filter according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a diagram showing an outline of a filter to which Embodiment 1 of a filter replacement method for a filter according to the present invention can be applied, and is a side cross-sectional view cut away so that the inside can be seen.

  The filter 100 houses the filter 2 in the container 1 and covers the container 1 with an upper lid 6 so as to shield the inside of the container 1. When purifying the water containing the solid substance having the filtration treatment, that is, the radioactive substance, the water to be purified is passed through the filter 2 to remove the solid substance contained in the water. In addition, about the flow of the water to be purified in the filter 100, it is sufficient that the water is passed through the filter 2 and is not a main part of the present invention, and thus detailed description thereof is omitted.

  In the present embodiment, three filters 2 are provided in the container 1, and the bottom of the filter 2 is fixed to the floor 1 a of the container 1. For example, each of the filters 2 is prevented from falling by an engaging portion (not shown). The engagement by the engaging portion (fixing of the filter 2 in the container 1) is released by rotating the filter 2, for example.

  FIG. 2 is a view showing a state in which a temporary lid 7 is put on the upper portion of the container 1 of FIG. 1 instead of the upper lid 6.

  The temporary lid 7 has openings 7 a having a size corresponding to the size of the filter 2 at the same number as the number of the filters 2 at positions corresponding to the positions of the filters 2.

  The “size corresponding to the size of the filter 2” means that there is almost no gap between the temporary lid 7 and the filter 2 when the filter 2 is taken out from the container 1 covered with the temporary lid 7 through the opening 7a. There is no size.

  The “position corresponding to the position of the filter 2” is a position through which the filter 2 passes when the filter 2 is taken out from the container 1 covered with the temporary lid 7.

  The opening 7a of the temporary lid 7 is closed with a plug 8 to prevent the radioactivity in the container 1 from leaking to the outside. The plug 8 is detachably provided on the temporary lid 7.

  FIG. 3 is a diagram showing a state in which one of the three filters 2 is taken out from the container 1 of FIG.

  Each filter 2 is taken out from the container 1 one by one. When the filter 2 is taken out, only the plug 8 corresponding to the filter 2 to be taken out is removed from the temporary lid 7. By doing in this way, the magnitude | size of the opening which a radioactivity leaks outside from the container 1 can be made small as much as possible.

  When the filter 2 is taken out from the opening 7 a from which the plug 8 is removed, the filter 2 is gripped by the gripping jig 9 so that the operator does not touch the filter 2 directly. As a result, the gripping jig 9 is attached to the filter 2.

  Next, a procedure for taking out the filter 2 when the filter 2 of the filter 100 is replaced will be described.

  As shown in FIG. 1, during the filtration process by the filter 100, the container 1 is covered with an upper lid 6 having no opening, which covers the inside of the container 1. Thereafter, when the filtration process is terminated and the filter 2 is replaced, first, all the water in the filter 100 is discharged.

  When draining of the water in the filter 100 is completed, it is necessary to remove the upper lid 6 from the container 1 in order to take out the filter 2. However, when the upper lid 6 is removed and the inside of the container 1 is opened, the filter 2 Since the exposure and the risk of exposure increase, the container 1 is covered with the temporary lid 7 in which the opening 7 a is closed with the plug 8 instead of the upper lid 6.

  In order to save the trouble of replacing the upper lid 6 with the temporary lid 7, it is conceivable to perform the filtration process with the temporary lid 7 placed on the container 1 instead of the upper lid 6, but this is not desirable. That is, the temporary lid 7 has the opening 7a even though it is closed by the plug 8, and there is no problem if it is used only for a short time during filter replacement work. Since the temporary lid 7 is used for a long time, there is a problem that the reliability of shielding in the filter 100 is inferior. For this reason, it is desirable to use the upper lid 6 without an opening during the filtration process.

  After the temporary lid 7 is put on the container 1, one of the plurality of plugs 8 (the rightmost plug 8 in FIG. 2) is removed from the temporary lid 7, and the opening 7a closed by the plug 8 is opened. To do.

  Thereafter, the gripping jig 9 is inserted into the container 1 from the opened opening 7a, and the filter 2 immediately below the opening 7a is gripped by the inserted gripping jig 9 and pulled up through the opening 7a. Before the pulling up, the filter 2 is rotated while the filter 2 is gripped by the jig 9 and the filter 2 is released from being fixed to the floor portion 1a.

  As shown in FIG. 3, when the filter 2 is gripped by the jig 9 and pulled up, the opening 7 a is closed by the filter 2.

  Meanwhile, as shown in FIG. 3, while the filter 2 is being lifted up by being gripped by the gripping jig 9, a portion of the filter 2 above the temporary lid 7 is exposed. There is concern about exposure to radiation. Therefore, in this embodiment, the filter 2 is stored in the shielding cover 10 shown in FIG.

  FIG. 4 is a view showing a state in which the filter 2 taken out from the container 1 in FIG. 1 is housed in the shielding cover 10.

  In this embodiment, as shown in FIG. 3, for example, after the filter 2 is gripped by the gripping jig 9, the shielding cover 10 is installed on the upper portion of the opening 7 a so that the filter 2 is not exposed. The electric chain block 11 is installed thereon.

  In order to reduce the exposure amount of the operator, a shielding cover 10 is used for pulling out the filter 2. The shielding cover 10 has a box structure in which four directions (front, rear, left and right) are surrounded by iron plates, and is installed above the temporary lid 7 so as to cover the opening 7a corresponding to the filter 2 to be taken out. By storing the filter 2 pulled up from the inside of the container 1 in the container, the filter 2 is not exposed and the radiation from the filter 2 to the outside can be reduced.

  Further, by attaching the electric chain block 11 to the upper part of the shielding cover 10, the gripping jig 9 can be pulled up by the electric chain block 11 and the filter 2 gripped by the gripping jig 9 can be stored in the shielding cover 10. .

  FIG. 5 is a diagram showing an outline of a filter to which Embodiment 2 of the filter replacement method for a filter according to the present invention can be applied, and is a side cross-sectional view cut away so that the inside can be seen.

  The filter 200 stores the filter 4 in the container 3 and covers the container 3 with an upper lid 12 so as to shield the inside of the container 3. When purifying the water containing the solid matter having the filtration treatment, that is, the radioactive material, the water to be purified is passed through the filter 4 to remove the solid matter contained in the water. In addition, about the flow of the water to be purified in the filter 200, it is sufficient that the water is passed through the filter 4 and is not a main part of the present invention, and thus detailed description thereof is omitted.

  In this embodiment, three filters 4 are provided in the container 3, and the upper part of the filter 4 is fixed to the lower surface of the tube plate 5 placed on the upper part of the container 3.

  Next, a procedure for taking out the filter 4 when replacing the filter 4 of the filter 200 will be described.

  As shown in FIG. 5, during the filtration process by the filter 200, the container 3 is shielded by covering the container 3 with the upper lid 12 having no opening. Thereafter, when the filtration process is terminated and the filter 4 is replaced, first, all the water in the filter 200 is discharged.

  When draining of the water in the filter 200 is completed, the upper lid 12 is removed from the container 3 in order to take out the filter 4. In this embodiment, even if the upper lid 12 is removed, the inside of the container 3 is shielded by the tube plate 5 and the filter 4 is not exposed. Therefore, it is necessary to provide a temporary lid corresponding to the temporary lid 7 of the first embodiment. Absent. However, when the filter 4 fixed to the lower surface of the tube plate 5 is taken out from the container 3, the filter 4 is exposed. Therefore, in this embodiment, the filter 4 is stored in the shielding cover 13 shown in FIG.

  FIG. 6 is a view showing a state in which the filter 4 taken out from the container 3 in FIG. 5 is housed in the shielding cover 13.

  In the present embodiment, after removing the upper cover 12 so that the filter 4 is not exposed, the shielding cover 13 is installed on the upper part of the tube sheet 5, and the electric chain block 14 is further installed thereon.

  The shielding cover 13 is installed above the container 3 so as to cover an opening generated by pulling up the tube plate 5 from the container 3, and stores the filter 4 taken out from the container 3 by the electric chain block 14.

  When the filter 4 is taken out, the filter plate 4 is taken out from the container 3 together with the tube plate 5 by pulling up the tube plate 5 using the electric chain block 14. At this time, the filter 4 is housed in the shielding cover 13 in order to reduce the exposure amount of the worker. The shielding cover 13 has a box structure in which four directions of front, rear, left and right are surrounded by iron plates. By storing the filter 4 pulled up from the container 3 in the shielding cover 13 together with the tube plate 5, the filter 4 is The radiation from the filter 4 to the outside can be reduced without being exposed.

(Appendix)
Note that the present invention described above may have the following configuration.

1.
In a filter replacement method for a filter that filters water containing radioactive solids with a filter in a container,
When the filter in the container is taken out, instead of the upper lid that shields the inside of the container during the filtration process by the filter, the opening corresponding to the size of the filter and the same number of openings as the filter and the filter Including a step of shielding the inside of the container using a temporary lid having a plug for closing each of the openings.
And a filter replacement method for the filter,
By configuring in this way,
-When removing the filter, it is only necessary to open the size of the opening, so that it is possible to provide a filter replacement method for a filter that requires only a small amount of opening and that requires minimal exposure to the operator.

2.
1. In the filter replacement method of the filter according to,
After taking out the inside of the container using the temporary lid, when taking out one of the filters in the container, only the plug corresponding to the filter to be taken out is removed from the temporary lid, and the filter corresponding to the filter to be taken out is removed. Inserting a grasping jig into the container from the opening, grasping the filter to be taken out by the grasping jig, releasing the fixation of the filter into the container, and removing the filter from the container;
And a filter replacement method for the filter,
By configuring in this way,
-It is possible to provide a filter replacement method for a filter in which an operator does not need to touch the filter directly and the operator is not exposed as much as possible.

3.
2. In the filter replacement method of the filter according to,
When removing the filter from the container, the filter is stored in a shielding cover.
And a filter replacement method for the filter,
By configuring in this way,
-Since the filter taken out from the container is stored in the shielding cover, it is possible to provide a filter replacement method for a filter that requires minimal exposure by the operator.

4).
3. In the filter replacement method of the filter according to,
When removing the filter from the container, the filter is stored in the shielding cover by the electric chain block.
And a filter replacement method for the filter,
By configuring in this way,
-Since the operator does not manually remove the filter, it is possible to provide a filter replacement method for a filter that does not require the operator to be exposed as much as possible.

5.
In a filter replacement method for a filter that filters water containing radioactive solids with a filter in a container,
The filter in the container is fixed below the tube plate provided in the upper part of the container,
When removing the filter in the container, the upper lid that shields the inside of the container during the filtration process by the filter is removed from the container, and the filter in the container is moved together with the tube plate by pulling the tube plate upward. Take it out of the container,
And a filter replacement method for the filter,
By configuring in this way,
-Since the filter can be taken out in a state where the inside of the container is shielded by the tube sheet, it is possible to provide a filter replacement method for a filter that requires minimal exposure to the operator.

6).
5. In the filter replacement method of the filter according to,
When removing the filter from the container, the filter is stored in a shielding cover.
And a filter replacement method for the filter,
By configuring in this way,
-Since the filter taken out from the container is stored in the shielding cover, it is possible to provide a filter replacement method for a filter that requires minimal exposure by the operator.

7).
6). In the filter replacement method of the filter according to,
When removing the filter from the container, the filter is stored in the shielding cover by the electric chain block.
And a filter replacement method for the filter,
By configuring in this way,
-Since the operator does not manually remove the filter, it is possible to provide a filter replacement method for a filter that does not require the operator to be exposed as much as possible.

8).
In a filter exchange system for a filter that filters water containing radioactive solids with a filter in a container,
A filter having the filter, a container for storing the filter, and an upper lid that is detachable from the container and shields the inside of the container during the filtration process;
A lid that is installed in the container in place of the upper lid and shields the inside of the container, and has a size corresponding to the size of the filter and the same number of openings as the filter and a plug that closes each of the openings. A temporary lid having
A gripping jig attached to the filter to be taken out when taking out one of the filters from the container;
When one of the filters is taken out from the container, the filter is installed above the temporary lid so as to cover the opening corresponding to the filter to be taken out, and can store one of the filters taken out from the container. A shielding cover;
After shielding the inside of the container using the temporary lid, when taking out one of the filters in the container, only the plug corresponding to the filter to be taken out is removed from the temporary lid through the opening. A crane device (for example, the electric chain block 11) for pulling up the gripping jig attached to the filter to be taken out and taking out the filter from the container into the shielding cover on the temporary lid;
A filter replacement system characterized by comprising:
By configuring in this way,
-It is possible to provide a filter replacement method for a filter that requires minimal exposure to the operator.

9.
In a filter exchange system for a filter that filters water containing radioactive solids with a filter in a container,
The filter, a container for storing the filter, and a tube plate provided on an upper portion of the container in a state where the filter is fixed to a lower surface and the filter is stored in the container, and the container is detachable from the container and is being filtered A filter having an upper lid that shields the inside;
A crane device (e.g., electric chain block 14) that pulls up the tube plate above the container from which the upper lid has been removed and takes out the filter together with the tube plate;
A shielding cover that is installed above the container so as to cover an opening generated by pulling up the tube sheet from the container, and stores the filter taken out from the container by the crane device;
A filter replacement system characterized by comprising:
By configuring in this way,
-It is possible to provide a filter replacement method for a filter that requires minimal exposure to the operator.

10.
In order to reduce the exposure of workers when water containing radioactive solids is treated with a filter and then the filter container is opened to replace the used filters one by one, A temporary lid with a hole is provided immediately above the filter so as to minimize the release part.

11.
In order to reduce the exposure dose of workers when replacing a filter containing radioactive material, a temporary lid with a hole is installed immediately above the filter, and a plug is installed in the hole.

12
When pulling out a filter containing a radioactive substance from a container, the fixing of the filter to the container can be released without directly touching the filter, and a gripping tool that can be pulled out from the container is used. .

13.
In order to reduce the exposure of workers when pulling out a filter containing radioactive material from the container, the filter should be pulled out using a shielding cover that can be housed inside so that the pulled out filter will not be exposed. It is characterized by carrying out.

14
In order to reduce the exposure amount of the operator when one filter containing a radioactive substance is pulled out from the container, the filter is housed inside the shielding cover using an electric chain block.

15.
After processing radioactive water containing solids using a filter, when pulling out the used filter together with the tube plate to which the filter is fixed, the filter is used to reduce the exposure dose of the operator. The filter is pulled out using a shielding cover in which the tube sheet can be housed.

16.
In order to reduce the exposure of workers when pulling out a filter containing radioactive material and a tube plate to which the filter is fixed from the container, the filter and the tube plate should be stored inside the shielding cover using an electric chain block. It is characterized by.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 1 ... Container, 2 ... Filter, 3 ... Container, 4 ... Filter, 5 ... Tube plate, 6 ... Upper lid, 7 ... Temporary lid, 7a ... Opening, 8 ... Plug, 9 ... Grab jig, 10 ... Shielding cover, 11 ... Electric chain block, 12 ... Top cover, 13 ... Shielding cover, 14 ... Electric chain block, 100 ... Filter, 200 ... Filter

Claims (5)

In a filter replacement method for a filter that filters water containing radioactive solids with a filter in a container,
When the filter in the container is taken out, instead of the upper lid that shields the inside of the container during the filtration process by the filter, the opening corresponding to the size of the filter and the same number of openings as the filter and the filter Including a step of shielding the inside of the container using a temporary lid having a plug for closing each of the openings.
A filter replacement method for a filter. In the filter exchange method of the filter according to claim 1,
After taking out the inside of the container using the temporary lid, when taking out one of the filters in the container, only the plug corresponding to the filter to be taken out is removed from the temporary lid, and the filter corresponding to the filter to be taken out is removed. Inserting a grasping jig into the container from the opening, grasping the filter to be taken out by the grasping jig, releasing the fixation of the filter into the container, and removing the filter from the container;
A filter replacement method for a filter. In the filter replacement method of the filter according to claim 2,
When removing the filter from the container, the filter is stored in a shielding cover.
A filter replacement method for a filter. In the filter replacement method of the filter according to claim 3,
When removing the filter from the container, the filter is housed in the shielding cover by an electric chain block.
A filter replacement method for a filter. In a filter exchange system for a filter that filters water containing radioactive solids with a filter in a container,
A filter having the filter, a container for storing the filter, and an upper lid that is detachable from the container and shields the inside of the container during the filtration process;
A lid that is installed in the container in place of the upper lid and shields the inside of the container, and has a size corresponding to the size of the filter and the same number of openings as the filter and a plug that closes each of the openings. A temporary lid having
A gripping jig attached to the filter to be taken out when taking out one of the filters from the container;
When one of the filters is taken out from the container, the filter is installed above the temporary lid so as to cover the opening corresponding to the filter to be taken out, and can store one of the filters taken out from the container. A shielding cover;
After shielding the inside of the container using the temporary lid, when taking out one of the filters in the container, only the plug corresponding to the filter to be taken out is removed from the temporary lid through the opening. A crane device for pulling up the gripping jig attached to the filter to be taken out and taking out the filter from the container into the shielding cover on the temporary lid;
A filter exchange system comprising:

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