JP6472705B2 - Radiation shield, radiation shielding method and method for carrying out reactor pressure vessel head - Google Patents

Description

  The present invention relates to a radiation shield, a radiation shielding method, and a method for carrying out a reactor pressure vessel head, and in particular, used when carrying out a reactor pressure vessel head in a nuclear power plant, and the reactor pressure vessel without radiation leaking. The present invention relates to a radiation shielding body and a radiation shielding method capable of carrying out a head carrying-out operation and a method for carrying out a reactor pressure vessel head.

  Patent Document 1 can be cited as a radiation shielding technique in a nuclear power plant.

  This patent document 1 includes a plurality of radiation shielding modules arranged to be engaged with each other in order to shield radiation directed toward a protection target from the outside, and the radiation shielding module includes radiation attenuation that attenuates radiation. And a joint portion that is provided in the radiation attenuation portion and engages with an adjacent radiation shielding module so that the angle can be adjusted, and the joint portion includes a convex angle adjustment engagement portion and an angle adjustment engagement portion. A concave engagement receiving portion having a corresponding shape, and engaging the angle adjusting engagement portion and the engagement receiving portion of the radiation shielding modules adjacent to each other with respect to one radiation shielding module. A radiation shielding unit is described in which the angle of the other radiation shielding module can be adjusted.

JP2013-250170A

  However, although the radiation shielding unit described in Patent Document 1 can change its shape in a certain direction, it is basically applicable to an object having various shapes because of deformation caused by a joint. It becomes difficult. Also, no consideration is given to radiation diffusion.

  The present invention has been made in view of the above points, and the object of the present invention is to handle easily and diffuse radiation even when the application target is applied to an object having various shapes. It is an object of the present invention to provide a radiation shielding body, a radiation shielding method, and a method for carrying out a reactor pressure vessel head that can be prevented.

  In order to achieve the above object, the radiation shield of the present invention is a storage container in which the shield can be disposed, for example, a cylindrical storage container, and is fixed to the storage container, and the inner peripheral surface of the storage container And a bag water shield having elasticity that allows liquid to be injected therein, and the storage container is disposed around a radiation shielding object, and liquid is injected into the bag water shield. Then, the bag water shield is inflated and brought into close contact to shield radiation from the radiation shielding object.

  In order to achieve the above object, the radiation shielding method of the present invention, for example, arranges a cylindrical storage container around a radiation shielding object and is fixed to the storage container, and the inner peripheral surface of the storage container. Injecting a liquid into a stretchable bag-water shield disposed along the surface to inflate the bag-water shield to intimately contact it, thereby shielding radiation from the radiation shield object. .

  Furthermore, in order to achieve the above object, the method for carrying out the reactor pressure vessel head according to the present invention mainly uses a storage vessel larger than the reactor pressure vessel head, for example, a cylindrical storage vessel. The liquid container is fixed to the storage container, and the bag water shield is disposed along the inner peripheral surface of the storage container so that the liquid is inflated to intimately adhere, A suspension balance for lifting the reactor pressure vessel head in a state, or a device-containing vessel containing a stud bolt tensioner, a cutting device, a suspension balance and the like for removing and carrying out the reactor pressure vessel head, It is suspended from the close contact portion of the shield, and when the suspension balance or the device enclosure is lowered to a predetermined position, it is fixed to the reactor pressure vessel head, and then the suspension balance or the device enclosure Both the reactor pressure vessel head is lifted from the close contact portion of the bag water shield, the bag water shield located above and / or below the reactor pressure vessel head is in close contact, and the radiation is shielded. The reactor pressure vessel head is carried out.

  ADVANTAGE OF THE INVENTION According to this invention, even if it is a case where an application target is applied to the target object which has various shapes, handling is easy and it can prevent the spreading | diffusion of a radiation.

It is a figure showing the schematic structure of the boiling water nuclear power plant to which the radiation shield of the present invention is applied. It is a figure which shows schematic structure of the upper part of the boiling water nuclear power plant of FIG. It is Example 1 of the radiation shielding body of this invention, and is sectional drawing which shows the state before water is poured into a bag water shielding body. It is a top view of Fig.3 (a). It is Example 1 of the radiation shielding body of this invention, and is sectional drawing which shows the state after water was poured into the bag water shielding body. FIG. 5 is a plan view of FIG. It is sectional drawing which shows the other example of the water injection to the bag water shield in Example 1 of the radiation shield of this invention. It is sectional drawing which shows the state before lifting of a reactor pressure vessel head at the time of lifting a reactor pressure vessel head, shielding a radiation using Example 1 of the radiation shielding body of this invention. It is sectional drawing which shows the state in the middle of lifting of a reactor pressure vessel head at the time of lifting a reactor pressure vessel head, shielding a radiation using Example 1 of the radiation shielding body of this invention. It is sectional drawing which shows the state by which the reactor pressure vessel head was lifted to the upper part of the bag water shield at the time of lifting a reactor pressure vessel head while shielding radiation using Example 1 of the radiation shield of the present invention. is there. It is Example 2 of the radiation shield of this invention, and is sectional drawing which shows the state before lifting of the reactor pressure vessel head using the radiation shield of this Example 2. FIG. It is Example 3 of the radiation shield of this invention, and is sectional drawing which shows the state before lifting of the reactor pressure vessel head using the radiation shield of this Example 3. FIG. It is a top view of Fig.10 (a). It is a figure which shows the state which opened the sliding door of Fig.10 (a). It is sectional drawing which shows the state which lifted the reactor pressure vessel head using Example 3 of the radiation shielding body of this invention. It is Example 4 of the radiation shield of this invention, and is sectional drawing which shows the state before lifting of the reactor pressure vessel head using the radiation shield of this Example 4. FIG. It is a top view of Fig.13 (a). It is sectional drawing which shows the state which lifted the reactor pressure vessel head using Example 4 of the radiation shielding body of this invention. It is Example 5 of the radiation shield of this invention, and is sectional drawing which shows the state before lifting of the reactor pressure vessel head using the radiation shield of this Example 5. FIG. It is Example 6 of the radiation shield of this invention, It is sectional drawing which shows the state before lifting of the reactor pressure vessel head using the radiation shield of this Example 6. FIG. It is the schematic of the apparatus inclusion container in FIG.

  The radiation shield, radiation shielding method and method for carrying out the reactor pressure vessel head according to the present invention will be described below based on the illustrated embodiments. In addition, in each Example, the same code | symbol is used for the same component.

  1 and 2 show a boiling water nuclear power plant to which the radiation shield of the present invention is applied. FIG. 1 is an overall configuration of a boiling water nuclear plant, and FIG. 2 is an upper configuration of the boiling water nuclear plant.

  In the figure, a boiling water nuclear power plant 100 includes a nuclear reactor 20 and a reactor containment vessel (hereinafter referred to as PCV) 21. The PCV 21 is installed in the reactor building 22 and is sealed with a PCV upper lid 23 attached to the upper end. The PCV 21 has a dry well 24 formed therein and a pressure suppression chamber 25 in which a pressure suppression pool filled with cooling water is formed. One end of the vent passage 26 communicated with the dry well 24 is immersed in the cooling water of the pressure suppression pool in the pressure suppression chamber 25. A shield plug 27, which is a radiation shielding body divided into a plurality of parts, is disposed directly above the PCV upper lid 23, and these shield plugs 27 are installed on the operation floor of the reactor building 22.

  The nuclear reactor 20 includes a nuclear reactor pressure vessel (hereinafter referred to as RPV) 7 to which a reactor pressure vessel head 7A is attached, a core 28 loaded with a plurality of fuel assemblies 32 containing nuclear fuel materials, and a steam-water separation. A vessel 29 and a steam dryer 30 are provided. The core 28, the steam separator 29 and the steam dryer 30 are arranged in the RPV 7. A core shroud 31 installed in the RPV 7 surrounds the core 28. The fuel assembly 32 loaded in the core 28 is supported at the lower end portion by the core support plate 33 and held at the upper end portion by the upper lattice plate 34. The steam / water separator 29 is disposed above the upper lattice plate 34 located at the upper end of the core 28, and the steam dryer 30 is disposed above the steam / water separator 29.

  A plurality of control rod guide tubes 35 are arranged below the core 28 and are constituted by a plurality of control rod guide tubes 35 and a shroud support cylinder (not shown). Control rods 36 that are taken in and out between the fuel assemblies 32 in the core 28 and control the reactor power are arranged in a plurality of control rod guide tubes 35. A plurality of control rod drive mechanism housings 37 are attached to the lower mirror 38 of the RPV 7. A control rod drive mechanism (not shown) is installed in each control rod drive mechanism housing 37 and connected to the control rod 36 in the control rod guide tube 35. Steam / water separator 29, steam dryer 30, core shroud 31, upper lattice plate 34, core support plate 33, shroud support cylinder, control rod guide tube 35, core shroud lower shell (not shown) installed in RPV 7 Is a furnace internal structure.

  The RPV 7 is installed on a cylindrical pedestal 40 provided on a concrete mat 39 provided at the bottom of the PCV 21. A cylindrical gamma ray shield 41 is installed at the upper end of the pedestal 40 and surrounds the RPV 7.

  The reactor building 22 has a dryer / separator storage pool (hereinafter referred to as DSP) 42 and a spent fuel storage pool (hereinafter referred to as SFP) for temporarily storing used fuel so as to sandwich the reactor well 14. 43 is provided. The DSP 42 is used as a place for temporarily placing in-furnace structures such as the steam separator 29 and the steam dryer 30 during periodic inspection. Further, an RPV heat insulating material (not shown) is provided on the upper portion of the reactor pressure vessel head 7A.

  FIG. 3A, FIG. 3B, FIG. 4A, and FIG. 4B show Embodiment 1 of the radiation shield of the present invention applied to the above-described boiling water nuclear power plant. 3 (a) and 3 (b) show the state before the liquid, which is water, is poured into the bag water shield described later, and FIG. 4 (a) and FIG. 4 (b) show the bag water shield. The state after the liquid which is water is inject | poured into the body is each shown, The storage container has shown the cylindrical thing as an example.

  As shown in the figure, the radiation shield of the present embodiment is fixed to a cylindrical storage container 1 and a hook 3 to the storage container 1, and is disposed along the inner peripheral surface of the storage container 1. For example, the bag water shield 2 having elasticity, into which water (liquid) 6 is injected, is connected to the water supply / drainage pipe 4 having a valve 5.

  Then, the storage container 1 to which the bag shield 2 is fixed is arranged around a radiation shielding object (for example, a reactor pressure vessel head 7A described later) (FIGS. 3A and 3B). In addition, by opening the valve 5, water 6 is injected into the bag water shield 2 through the water supply / drain pipe 4, and the bag water shield 2 is inflated to inflate the bag water shield 2. By doing (the state of FIG. 4A and FIG. 4B), the radiation from the radiation shielding object is shielded.

  As shown in FIG. 5, the water 6 is injected into the bag water shield 2 using the pump 13 with the water supply / drain pipe 4 connected above the bag water shield 2 and the valve 5 opened. It may be.

  FIGS. 6 to 8 show how the reactor pressure vessel head 7A is lifted while shielding the radiation using the radiation shield of the present embodiment described above. FIG. 6 shows the state before the reactor pressure vessel head 7A is lifted. FIG. 7 shows a state in which the reactor pressure vessel head 7 </ b> A is being lifted, and FIG. 8 shows the state in which the reactor pressure vessel head 7 </ b> A is lifted up to the upper part of the bag water shield 2.

  First, as shown in FIG. 6, the cylindrical storage container 1 is installed so that the reactor pressure vessel head 7 </ b> A is at the center, and is fixed to the storage container 1 with a hook 3, along the inner peripheral surface of the storage container 1. The bag 5 is inflated by inflating the bag water shield 2 by injecting water (liquid) 6 through the water supply / drainage pipe 4 by opening the valve 5 into the stretchable bag water shield 2 arranged in The water shield 2 is brought into close contact, and in this state, the suspension balance 8 for lifting the reactor pressure vessel head 7A by a crane device (not shown) or the like is attached to the bag water shield 2 (cylindrical central portion). When the suspension balance 8 is lowered to a predetermined position, the suspension pressure vessel head 7A is fixed to the reactor pressure vessel head 7A. Thereafter, the reactor pressure vessel head 7A is lifted together with the suspension balance 8, and the atoms in the contact portion of the bag water shield 2 are lifted. Where the furnace pressure vessel head 7A passes Open bag water shield 2 is pushed, the reactor pressure vessel head 7A is lifted. At that time, the bag water shield 2 positioned above and / or below the reactor pressure vessel head 7A is in close contact, that is, the bag water shield below the reactor pressure vessel head 7A after the reactor pressure vessel head 7A has passed. 2 and the bladder shield 2 above the reactor pressure vessel head 7A are in close contact with each other (this state is shown in FIG. 7). Thereafter, the reactor pressure vessel head 7 </ b> A is further lifted up to the top of the bag water shield 2. At that time, radiation is completely shielded by the close contact of the bag shield 2 under the reactor pressure vessel head 7A (this state is shown in FIG. 8). In this state, the reactor pressure vessel head 7A is carried out by a crane device (not shown) or the like.

  The bag water shield 2 into which water (liquid) 6 is injected is formed of a sealing material made of polyurethane and a strength material made of aramid fiber, Kepler fiber, carbon fiber, or the like that retains the weight of water (hereinafter, referred to as “water”). The same applies to the bag water shield described).

  By adopting such a configuration of the present embodiment, even when the application target is applied to an object having various shapes, the bag water shield 2 can be used to shield the radiation, so that handling is easy. Moreover, the diffusion of radiation can be prevented. In particular, if the present embodiment is applied when carrying out the reactor pressure vessel head 7A and the like in a nuclear power plant, the effect is remarkable.

  FIG. 9 shows a second embodiment of the radiation shield of the present invention.

  In this embodiment shown in the figure, the same structure as that of the bag water shield 2 is formed on the upper part of the bag water shield 2 fixed to the cylindrical storage container 1 described in the first embodiment by the hook 3. The second bag water shield 9 is connected to the cylindrical storage container 1 and connected to a water supply / drain pipe having a valve (not shown) fixed by a hook 3A. Also, by opening the valve, water (liquid) 6A pumped by a pump or the like through the water supply / drainage pipe is injected, and radiation is shielded by both the second bag water shield 9 and the bag water shield 2, In this state, the reactor pressure vessel head 7 is lifted and unloaded by a crane device (not shown) or the like via a suspension balance 8.

  Even in this embodiment, the same effect as in the first embodiment can be obtained, and the radiation is shielded by both the bag water shield 2 and the second bag water shield 9. This has the effect of improving reliability.

  10 (a), 10 (b), 11 and 12 show a radiation shield according to a third embodiment of the present invention.

  In the present embodiment shown in the figure, an opening 11 is provided in a part of a side surface where a reactor pressure vessel head 7A, which is a radiation shielding object of the storage container 1, is located, and a slide door 10 that closes the opening 11 is provided. And a plurality of, for example, four independent bag water shields 2a, 2b, 2c, 2d so that the bag water shield surrounds the reactor pressure vessel head 7A (these four independent bag water shields). 2a, 2b, 2c, and 2d are connected to a water supply / drain pipe provided with a valve (not shown)), and Example 2 is provided above these four independent bag water shields 2a, 2b, 2c, and 2d. A similar second bag water shield 9 is provided.

  Then, after injecting water (liquid) 6A pumped by a pump or the like through the water supply / drainage pipe by opening the valve into the second bag water shielding body 9, the opening 11 (the slide door 10 is opened) As shown in FIG. 11, four bag water shields 2a, 2b, 2c, and 2d are sequentially inserted into the storage container 1, and each valve is opened so that water (liquid) 6 is supplied through each water supply / drain pipe. The reactor pressure vessel head 7A is injected and lifted via a suspension balance 8 with a crane device (not shown) or the like while pressing the side face of the reactor pressure vessel head 7A (this state is shown in FIG. 12). The reactor pressure vessel head 7 </ b> A is carried out in a state of being shielded through the close contact portion of the second bag water shield 9. Reference numeral 14 </ b> A denotes an opening formed in the reactor well 14.

  Even in this embodiment, the same effect as in Embodiment 2 can be obtained, and the bag water shield is composed of four independent bag water shields 2a, 2b, 2c and 2d. Compared to an integral bag water shield, there is an effect that handling becomes easier.

  13 (a), 13 (b) and 14 show a radiation shield according to a fourth embodiment of the present invention.

  In the present embodiment shown in the figure, an opening 11 is provided in a part of a side surface where a reactor pressure vessel head 7A, which is a radiation shielding object of the storage container 1, is located, and a slide door 10 that closes the opening 11 is provided. And a plurality of, for example, four independent sachet water shields 2a1, 2b1, 2c1, 2d1 having the same height as the top surface of the reactor pressure vessel head 7A (the four independent water shields). Each of the sachet water shields 2a1, 2b1, 2c1, 2d1 is connected to a water supply / drain pipe having a valve (not shown), and is located above the four sachet water shields 2a1, 2b1, 2c1, 2d1. And a plurality of, for example, two independent large bag water shields 12a and 12b that shield the upper surface of the reactor pressure vessel head 7A (the two independent large bag water shields 12a and 12b). Each is connected to a water supply / drain pipe having a valve (not shown), and a second bag water shield 9 similar to the second and third embodiments above the two independent large bag water shields 12a and 12b. Is installed.

  And after inject | pouring the water (liquid) 6A pumped up with the pump etc. through the water supply / drain pipe by opening a valve | bulb to the 2nd bag water shield 9, from the opening part 11 by which the slide door 10 was open | released Four sachet water shields 2a1, 2b1, 2c1, and 2d1 are sequentially inserted into the storage container 1, and each valve is opened to inject water (liquid) 6 through each water supply / drain pipe. The side of the pressure vessel head 7A is pressed to shield the radiation, and then two large bag water shields 12a and 12b are inserted into the storage container 1 from the opening 11 where the slide door 10 is opened, and each valve is opened. As a result, water (liquid) 6B is injected through the respective water supply / drainage pipes, and suspended by a crane device (not shown) or the like with the upper surface of the reactor pressure vessel head 7A shielded from radiation. Lifting through the balance 8 (This state is shown in FIG. 14), furthermore, is intended to carry the reactor pressure vessel head 7A in a state of being shielded through close contact portion of the second bladder water shield 9.

  Even in this embodiment, the same effects as those of the embodiment 3 can be obtained. Of course, four independent sachet water shields 2a1, 2b1, 2c1, 2d1, and two independent sachet water shields 12a. , 12b and the second bag water shield 9 can carry out the reactor pressure vessel head 7A while shielding the radiation in three stages, which has the effect of further improving the reliability.

  FIG. 15 shows a fifth embodiment of the radiation shield of the present invention.

  In this embodiment shown in the figure, when the reactor pressure vessel head 7A described in the embodiment 1 is carried out, water (liquid) 6A is continuously injected into the storage vessel 1, and the reactor pressure vessel head 7A is It is to be taken out.

  Even in this embodiment, the same effect as in Embodiment 1 can be obtained, and the diffusion of dust is further prevented by filling the gap of the bag water shield 2 with water (liquid) 6A. In addition, it is possible to decontaminate the reactor pressure vessel head 7A and the like carried out by water (liquid) 6A, so that the reliability is further improved.

  FIG. 16 shows a sixth embodiment of the radiation shield of the present invention.

  In the present embodiment shown in the figure, the bag water shield 2 fixed by the hook 3 is installed in the cylindrical storage container 1 described in the first embodiment, and is disposed around the reactor pressure vessel head 7A. After opening the valve 5 and injecting water 6 into the bag water shield 2 through the water supply / drain pipe 4 to inflate the bag water shield 2 to shield the radiation, the device storage container shown in FIG. 44 is suspended by a crane device (not shown).

  After the reactor pressure vessel head 7A is removed by the stud bolt tensioner 45 and the cutting device 46 in the device storage vessel 44, the reactor pressure vessel head 7A is fixed in the device storage vessel 44 by the suspension balance 8A, and the crane device The reactor pressure vessel head 7 </ b> A is lifted together with the apparatus containment vessel 44 (not shown).

  In other words, the reactor pressure vessel head 7A is removed in advance, and a stud bolt tensioner 45, a cutting device 46, and a device containing vessel 44 containing a suspension balance 8A are prepared. The storage vessel 1 is attached to the reactor pressure vessel head 7A. In addition to being installed at the center, water (liquid) 6 is injected into the bag water shield 2 fixed to the storage container 1 and disposed along the inner peripheral surface of the storage container 1, so that the bag water shield 2 In this state, the device inclusion container 44 is suspended from the contact portion of the bag water shield 2, and when the device inclusion container 44 is lowered to a predetermined position, it is fixed to the reactor pressure vessel head 7A. The reactor pressure vessel head 7A is lifted from the contact portion of the bag water shield 2 together with the device inner container 44, and the bag water shield 2 located above and / or below the device inner container 44 is brought into close contact with each other. The reactor pressure vessel head 7A is carried out together with the device-containing vessel 44 in a shielded state.

  Even in this embodiment, the same effects as those of the first embodiment can be obtained, and the apparatus necessary for removing the reactor pressure vessel head 7A is included in the apparatus inclusion container 44. There is an effect of further improving reliability by bringing in the apparatus from outside to the minimum.

  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 ... Storage container, 2, 2a, 2b, 2c, 2d ... Bag water shielding body, 2a1, 2b1, 2c1, 2d1 ... Pouch water shielding body, 3, 3A ... Hook, 4 ... Supply / drain pipe, 5 ... Valve, 6A, 6B ... water, 7 ... reactor pressure vessel (RPV), 7A ... reactor pressure vessel head, 8, 8A ... suspension balance, 9 ... second bag water shield, 10 ... sliding door, 11 ... opening 12a, 12b ... large bag water shield, 13 ... pump, 14 ... reactor well, 14A ... opening of reactor well, 20 ... reactor, 21 ... reactor containment vessel (PCV), 22 ... reactor building, 23 ... PCV top cover, 24 ... Dry well, 25 ... Pressure suppression chamber, 26 ... Vent passage, 27 ... Shield plug, 28 ... Core, 29 ... Air / water separator, 30 ... Steam dryer, 31 ... Core shroud, 32 ... Fuel assembly 33 ... Core support plate 34 ... Upper part Sub-panel, 35 ... control rod guide tube, 36 ... control rod, 37 ... control rod drive mechanism housing, 38 ... lower mirror, 39 ... concrete mat, 40 ... pedestal, 41 ... gamma ray shield, 42 ... dryer separator storage Pool (DSP), 43 ... spent fuel storage pool (SFP), 44 ... device containment vessel, 45 ... stud bolt tensioner, 46 ... cutting device, 100 ... boiling water nuclear plant.

Claims (18)

A storage container, and a bag water shield fixed to the storage container and disposed along the inner peripheral surface of the storage container, into which liquid is injected,
The storage container is arranged around the radiation shielding object, and the radiation from the radiation shielding object is shielded by injecting a liquid into the bag water shielding body and inflating the bag water shielding body so as to be in close contact therewith. A radiation shield characterized by: The radiation shield according to claim 1,
A water supply / drain pipe provided with a valve is connected to the bag water shield, and by opening and closing the valve, the liquid is injected into the bag water shield via the water supply / drain pipe, or the bag water shield is provided. A radiation shielding body for discharging the liquid from the body. The radiation shield according to claim 1 or 2,
A radiation shielding body, wherein a second bag-water shielding body having a configuration similar to that of the bag-water shielding body is installed on an upper portion of the bag-water shielding body fixed to the storage container. The radiation shield according to claim 3.
An opening is provided in a part of a side surface of the storage container on which the radiation shielding object is located, a sliding door is provided to close the opening, and the bag water shield is formed of a plurality of independent sachet water shields. Consists of
Wherein After the liquid was injected into the second bag water shield, the plurality of small bags water shield through the opening that the sliding door is opened, the are inserted into the container with the liquid is injected the radiation shield A radiation shield characterized by being installed so as to press a side surface of an object. The radiation shield according to claim 3.
An opening is provided in a part of a side surface of the storage container on which the radiation shielding object is located, a slide door that closes the opening is provided, and the bag-water shielding body has an upper surface height of the radiation shielding object. A plurality of independent pouch water shields having the same height, and a plurality of independent pouch water shields located above the pouch water shield and shielding the upper surface of the radiation shielding object,
When the liquid is injected into the second bag water shield, the plurality of sachet water shields are inserted into the storage container from the opening where the slide door is opened, and the liquid is injected into the radiation shielding object. The plurality of large bag water shields are inserted into the storage container from the opening where the slide door is opened and the liquid door is injected so that the liquid is injected and the upper surface of the radiation shielding object A radiation shield characterized by being installed so as to shield radiation from radiation. The radiation shield according to any one of claims 1 to 5,
The bag water shield is formed of a sealing material made of polyurethane and a strength material made of aramid fiber, Kepler fiber or carbon fiber for retaining water weight.   A storage container is arranged around the object to be shielded from radiation, and a liquid is injected into a bag water shield fixed to the storage container and arranged along an inner peripheral surface of the storage container to thereby remove the bag water shield. A radiation shielding method, wherein the radiation from the radiation shielding object is shielded by inflating and closely contacting. The radiation shielding method according to claim 7,
A water supply / drain pipe provided with a valve is connected to the bag water shield, and by opening and closing the valve, the liquid is injected into the bag water shield via the water supply / drain pipe, or the bag water shield is provided. A radiation shielding method, wherein the liquid is discharged from a body. The radiation shielding method according to claim 7 or 8,
On the upper part of the bag water shield fixed to the storage container, a second bag water shield having the same configuration as the bag water shield is installed, and liquid is also applied to the second bag water shield. A radiation shielding method, wherein the radiation is shielded by injection. The radiation shielding method according to claim 9.
An opening is provided in a part of the side surface of the storage container on which the radiation shielding object is located, a slide door that closes the opening is provided, and the bag water shield includes a plurality of independent bag water shields. Consists of
After injecting the liquid into the second bag water shield, the plurality of bag water shields are inserted into the storage container from the opening where the slide door is opened, and the liquid is injected into the radiation shield. A radiation shielding method comprising shielding a radiation from the radiation shielding object by pressing a side surface of the object. The radiation shielding method according to claim 9.
An opening is provided in a part of a side surface of the storage container on which the radiation shielding object is located, a slide door that closes the opening is provided, and the bag-water shielding body has an upper surface height of the radiation shielding object. A plurality of independent pouch water shields having the same height, and a plurality of independent pouch water shields located above the pouch water shield and shielding the upper surface of the radiation shielding object,
After injecting the liquid into the second bag water shield, the plurality of sachet water shields are inserted into the storage container through the opening where the slide door is opened, and the liquid is injected into the radiation shield. The side surface of the object is pressed to shield the radiation from the radiation shielding object, and then the plurality of large bag water shields are inserted into the storage container from the opening where the slide door is opened, and the liquid is discharged. A radiation shielding method comprising shielding an upper surface of the radiation shielding object injected from radiation.   The storage container is installed so that the reactor pressure vessel head is centered, and liquid is injected into a bag water shield fixed to the storage container and disposed along the inner peripheral surface of the storage container. When the water shield is inflated and in close contact, a suspension balance for lifting the reactor pressure vessel head is suspended from the contact portion of the bag water shield, and the suspension balance is lowered to a predetermined position. The reactor pressure vessel head is fixed to the reactor pressure vessel head, and then the reactor pressure vessel head is lifted from the close contact portion of the bag water shield together with the suspension balance, and is positioned above and / or below the reactor pressure vessel head. A method for carrying out a reactor pressure vessel head, wherein the reactor pressure vessel head is carried out in a state in which a bag water shield is in close contact and radiation is shielded. The method of carrying out a reactor pressure vessel head according to claim 12,
A water supply / drain pipe provided with a valve is connected to the bag water shield, and by opening and closing the valve, the liquid is injected into the bag water shield via the water supply / drain pipe, or the bag water shield is provided. A method for discharging a reactor pressure vessel head, wherein the liquid is discharged from a body. In the method for carrying out the reactor pressure vessel head according to claim 12 or 13,
On the upper part of the bag water shield fixed to the storage container, a second bag water shield having the same configuration as the bag water shield is installed, and liquid is also applied to the second bag water shield. A method of carrying out a reactor pressure vessel head, wherein the reactor pressure vessel head is carried out in a state where radiation is shielded by both the bag water shield and the second bag water shield. The method for carrying out a reactor pressure vessel head according to claim 14,
An opening is provided in a part of a side surface of the storage container where the reactor pressure vessel head is located, a sliding door is provided to close the opening, and the bag water shield is a plurality of independent bag water shields. Consisting of
After injecting the liquid into the second bag water shield, the plurality of bag water shields are inserted into the storage container from the opening where the slide door is opened, and liquid is injected into the reactor. A method of carrying out a reactor pressure vessel head, comprising carrying out the reactor pressure vessel head in a state where radiation is shielded by pressing a side surface of the pressure vessel head. The method for carrying out a reactor pressure vessel head according to claim 14,
An opening is provided in a part of a side surface of the storage container where the reactor pressure vessel head is located, and a sliding door that closes the opening is provided, and the bag water shield is provided on the reactor pressure vessel head. A plurality of independent pouch water shields having the same height as the top surface, and a plurality of independent large pouch water shields located above the pouch water shield and shielding the top surface of the reactor pressure vessel head. ,
After injecting the liquid into the second bag water shield, the plurality of pouch water shields are inserted into the storage container through the opening where the slide door is opened, and the liquid is injected into the reactor. The side of the pressure vessel head is pressed to shield the radiation from the reactor pressure vessel head, and then the plurality of large bag water shields are inserted into the storage vessel from the opening where the slide door is opened. A method of carrying out a reactor pressure vessel head, wherein the reactor pressure vessel head is carried out while liquid is injected and the upper surface of the reactor pressure vessel head is shielded from radiation. The method for carrying out a reactor pressure vessel head according to any one of claims 12 to 16,
A method of carrying out a reactor pressure vessel head, characterized in that liquid is continuously injected into the storage container in a state where radiation from the reactor pressure vessel head is shielded by the bag water shield.   Prepare a device internal container containing a stud bolt tensioner, a cutting device and a suspension balance for removing and carrying out the reactor pressure vessel head in advance, and installing the storage vessel so that the reactor pressure vessel head is at the center. The liquid is injected into a bag water shield fixed to the storage container and arranged along the inner peripheral surface of the storage container, and the bag water shield is inflated to be brought into close contact, and in this state, the device internals The container is hung from the close contact portion of the bag water shield, and when the apparatus inclusion container is lowered to a predetermined position, it is fixed to the reactor pressure vessel head, and then the reactor pressure vessel head together with the apparatus inclusion container is The device enclosure container is hung from the close contact portion of the bag water shield, the bag water shield located above and / or below the device enclosure container is in close contact, and the radiation is shielded. A method for carrying out a reactor pressure vessel head, comprising carrying out the reactor pressure vessel head.

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