JP2014190876A - Shield material collection nozzle, shield vessel, and device and method for collecting shield material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shield material collection nozzle, a shield vessel, and a device and method for collecting shield materials, which offer simplified structures, lighter weight, and improved shielding capability.SOLUTION: A shield material collection nozzle includes; a nozzle body 81 having an opening 91; a cover section 82 which is provided to cover a part of the opening 91 and allows fluid to pass through but not a shield material; and a passage section 83 which is provided in a portion of the opening 91 not covered by the cover section 82 and allows both the fluid and shield material to pass through.

Description

  The present invention relates to a shielding container applied when performing inspection work or repair work in a nuclear power plant, for example, a shielding material collection nozzle attached to the shielding container, and a shielding material collection device and method. .

  For example, a pressurized water reactor (PWR) in a nuclear power plant uses light water as a reactor coolant and a neutron moderator, and uses high-temperature and high-pressure water that does not boil over the entire core. To generate steam by heat exchange, and this steam is sent to a turbine generator for power generation.

  In such a nuclear power plant, it is necessary to periodically inspect structures and the like in order to ensure sufficient safety and reliability. And when each test | inspection is constructed and a malfunction is discovered, the necessary location related to a malfunction is repaired. And in a nuclear power plant, when performing such various work, it is necessary to reduce the radiation dose which acts on an operator.

  As such a conventional radiation shielding apparatus, there exists a thing described in the following patent document 1, for example. In the radiation shielding apparatus described in Patent Document 1, a hollow container is installed at a predetermined part of a shielded body, fluid is sent into the container through a hose by a fluid delivery means, and fluid is supplied by a shielding material supply means. By supplying a granular shielding material, the shielding material is conveyed and filled into the container through a hose, and shielding is performed by providing a container filled with the shielding material for the object to be shielded.

JP 2010-156615 A

  In the above-described conventional radiation shielding apparatus, a fluid is sent into a container by a pump, and a particulate shielding material is filled in the container together with the fluid. On the other hand, by sending the fluid into the container by the pump, the granular shielding material inside is discharged out of the container together with the fluid. In this case, the container is provided with an injection nozzle and a taking-in member inside, and the shielding material is discharged together with the fluid by the taking-in member while the shielding material is dispersed by the fluid ejected from the jet nozzle.

  Therefore, it is necessary for the conventional radiation shielding apparatus to fix the injection nozzle and the intake member inside the container, which makes the structure complicated and increases the weight of the container and makes it difficult to carry it. Further, the container cannot be filled with a shielding material in the space in which the injection nozzle and the intake member are arranged, and there is a possibility that only the portion is not sufficiently shielded.

  The present invention solves the above-described problems, and an object thereof is to provide a shielding material recovery nozzle, a shielding container, a shielding material recovery device, and a method for improving the shielding function while simplifying the structure and reducing the weight. And

  In order to achieve the above object, a shielding material recovery nozzle according to the present invention is provided with a nozzle body having an opening and a part of the opening so as to allow a fluid to pass therethrough and a shielding material not to pass therethrough. And a passage part that is provided outside the region of the opening that is covered by the covering part and through which the fluid and the shielding material can pass.

  Therefore, the fluid is discharged through the entire region of the opening including the covering portion and the passage portion, and the shielding material cannot be passed through the covering portion and is discharged only from the passage portion. Therefore, the amount of the shielding material passing through the opening can be limited, the density of the shielding material with respect to the fluid can be set to an appropriate density, and the shielding material can be efficiently recovered in a short time. In this way, it is possible to secure the passing portion simply by providing the covering portion so as to block a part of the opening portion, it is possible to simplify the structure and reduce the weight, and to improve the shielding function. .

  In the shielding material recovery nozzle of the present invention, the area of the covering portion is set larger than the area of the passage portion.

  Therefore, by securing a sufficient area area of the covering portion, the covering portion can be prevented from being blocked by the shielding material, and the shielding material can be efficiently recovered.

  In the shielding material recovery nozzle of the present invention, the region of the covering portion in the opening is set larger than the region of the passing portion.

  Therefore, the shielding material can be efficiently collected in a short time by securing a sufficient area of the covering portion.

  In the shielding material recovery nozzle of the present invention, the covering portion is made of a mesh material.

  Therefore, the structure can be simplified and the cost can be reduced by using the covering portion as a mesh material.

  In the shielding material recovery nozzle of the present invention, the nozzle main body is characterized in that the covering portion extends to the inlet side.

  Therefore, since the covering portion extends to the inlet side, the amount of protrusion to the outlet side can be reduced and the increase in size of the apparatus can be suppressed.

  In the shielding material recovery nozzle of the present invention, a protective part is provided above the covering part.

  Therefore, when the shielding material falls from above, the shielding material collides with the protection portion, so that contact with the covering portion is suppressed, and damage to the covering portion can be prevented.

  In the shielding material recovery nozzle of the present invention, the opening portion is circular, the protection portion has an arc shape along the upper edge of the opening portion, and the covering portion is provided at least below the protection portion. It is characterized by having one covering part.

  Therefore, when the protective part has an arc shape along the upper edge of the opening, the shielding material dropped from above is suppressed from being deposited on the protective part, and the shielding material can be properly recovered.

  In the shielding material recovery nozzle of the present invention, the covering portion includes a second covering portion provided at a tip portion of the protection portion and the first covering portion.

  Therefore, a sufficient area of the covering portion can be secured by using the covering portion as the first covering portion provided at the lower portion of the protection portion and the second covering portion provided at the tip portion.

  The shielding container of the present invention is a container body having a hollow shape, a supply unit capable of supplying a fluid and a shielding material to the inside of the container body, and a fluid and a shielding material inside the container body can be discharged. A discharge portion, and the shielding material recovery nozzle is attached to the discharge portion.

  Accordingly, when a fluid is supplied from the supply unit to the inside of the container main body, the pressure in the container main body increases, so that the fluid and the shielding material inside the container main body are pushed out from the discharge unit. At this time, the fluid is discharged through the entire region of the opening including the covering portion and the passage portion, and the shielding material cannot be passed through the covering portion and is discharged only from the passage portion. Therefore, the amount of the shielding material passing through the opening can be limited, the density of the shielding material with respect to the fluid can be set to an appropriate density, and the shielding material can be efficiently recovered in a short time. In this way, it is possible to secure a passing portion simply by providing a covering portion so as to block a part of the opening portion, and it is not necessary to arrange a large structure inside the container body, and the structure is simplified and reduced in weight. In addition, the shielding function can be improved.

  In the shielding container of this invention, the said coating | coated part is extended inside the inner wall face of the said container main body, It is characterized by the above-mentioned.

  Therefore, by extending the covering portion to the inlet side, the amount of protrusion to the outlet side can be reduced, and the covering portion can be disposed at the opening of the wall of the container body, The amount of protrusion can be reduced, and the enlargement of the apparatus can be suppressed.

  In the shielding container of the present invention, the supply unit is provided at the upper part of the container body and can supply fluid and shielding material, and is provided at the lower part of the container body and can supply only the fluid. A second supply unit, and the discharge unit is provided at an upper part of the container body and can discharge only fluid, and is provided at a lower part of the container body to discharge the fluid and the shielding material. And having a possible second discharge part.

  Accordingly, the first supply part and the first discharge part for filling the shielding material inside the container body are provided, and the second supply part and the second discharge part for collecting the shielding material inside the container body are provided. By providing, the filling and collection | recovery of the shielding material with respect to a container main body can be performed efficiently.

  In the shielding container of the present invention, the second supply unit and the second discharge unit are arranged to face each other in the horizontal direction.

  Accordingly, the fluid supplied from the second supply part to the inside of the container body is ejected to the second discharge part side, and the shielding material inside the container body is guided to the second discharge part, thereby the shielding material. Can be efficiently recovered.

  Further, the shielding material recovery apparatus of the present invention includes a supply line capable of supplying fluid to the shielding container, a pump provided in the supply line, and a discharge line capable of discharging the fluid and shielding material inside the shielding container. The shielding material recovery nozzle provided at the discharge portion of the shielding container and connected to the discharge line.

  Therefore, when the fluid is supplied from the supply unit to the inside of the container body through the supply line by operating the pump, the pressure in the shielding container rises, so that the fluid and the shielding material inside the shielding container are removed from the discharge part. Extruded to the discharge line. At this time, the fluid is discharged through the entire region of the opening including the covering portion and the passage portion, and the shielding material cannot be passed through the covering portion and is discharged only from the passage portion. Therefore, the amount of the shielding material passing through the opening can be limited, the density of the shielding material with respect to the fluid can be set to an appropriate density, and the shielding material can be efficiently recovered in a short time. In this way, it is possible to secure a passing portion simply by providing a covering portion so as to block a part of the opening portion, and it is not necessary to arrange a large structure inside the container body, and the structure is simplified and reduced in weight. In addition, the shielding function can be improved.

  In the shielding material recovery method of the present invention, the fluid is supplied from the supply unit to the inside of the shielding container to increase the internal pressure, and the fluid and shielding material inside the shielding container by the internal pressure of the shielding container are used as the shielding material. And a second step of pumping to the outside from the discharge section using the recovery nozzle.

  Therefore, the amount of the shielding material passing through the opening can be limited, the density of the shielding material with respect to the fluid can be set to an appropriate density, and the shielding material can be efficiently collected in a short time. In this way, it is possible to secure a passing portion simply by providing a covering portion so as to block a part of the opening portion, and it is not necessary to arrange a large structure inside the container body, and the structure is simplified and reduced in weight. In addition, the shielding function can be improved.

  According to the shielding material collecting nozzle, shielding container, shielding material collecting device and method of the present invention, a covering portion which is provided so as to block a part of the opening and allows fluid to pass therethrough and cannot pass the shielding material; Since the passage and the passage through which the fluid and the shielding material can pass are provided outside the region of the opening that is covered by the covering portion, the structure can be simplified and lightened, and the shielding function can be improved. be able to.

FIG. 1 is a cross-sectional view illustrating a main part of a shielding container according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing the shielding material recovery nozzle of this embodiment. FIG. 3 is a front view illustrating the shielding material recovery nozzle of the present embodiment. FIG. 4 is a perspective view showing the shielding material recovery nozzle of this embodiment. FIG. 5 is a schematic view showing a supply system and a discharge system for water and a shielding material in the shielding apparatus of the present embodiment.

  Exemplary embodiments of a shielding material collection nozzle, a shielding container, a shielding material collection device and method according to the present invention will be described below in detail with reference to the accompanying drawings. In addition, this invention is not limited by this Example, Moreover, when there exists multiple Example, what comprises combining each Example is also included.

  FIG. 1 is a cross-sectional view showing a main part of a shielding container according to one embodiment of the present invention, FIG. 2 is a cross-sectional view showing a shielding material collecting nozzle of this embodiment, and FIG. 3 is a shielding material collecting of this embodiment. FIG. 4 is a perspective view showing a shielding material recovery nozzle of the present embodiment, and FIG. 5 is a schematic view showing water and shielding material supply systems and discharge systems in the shielding device of this embodiment. .

  The shielding material collection nozzle, shielding container, shielding material collection device and method of this embodiment are a nuclear power plant such as a pressurized water nuclear plant (PWR) or boiling water nuclear plant (BWR). In particular, it is suitable for work such as maintenance inspection and repair of a nuclear power plant.

  As shown in FIG. 5, the radiation shielding apparatus of the present embodiment includes a shielding container 11 disposed at a predetermined part of the shielded body P, and a shielding material filling apparatus that supplies a shielding material together with a fluid into the shielding container 11. 12 and a shielding material collecting device 13 for collecting the shielding material filled in the shielding container 11 together with the fluid.

  In this case, the shielding container 11 is formed in a hollow shape, and is made of, for example, a rigid body such as stainless steel, or a material having flexibility and stretchability such as plastic or urethane rubber. In addition, the shielding material is formed in a granular shape, for example, tungsten-containing pellets obtained by solidifying tungsten powder into a granular shape with a resin material, stainless steel particles processed into stainless steel, lead particles processed into granular particles of lead, and deteriorated uranium. It is desirable to apply granular uranium grains or the like. And this shielding material is good to form spherical shape and the magnitude | size of a particle | grain in order in order to make the accumulation inside the shielding container 11 uniform. Further, water is optimal as the fluid, but pure water, boric acid water, polyvinyl alcohol, silicon oil, air, or the like may be applied in addition to water.

  The shielding material filling device 12 is a fluid and shielding material supply line for the shielding container 11, and includes a tank unit 21, a first supply pipe 22, a pump 23, a second supply pipe 24, and a shielding material supply hopper 25. And the third supply pipe 26. The second supply pipe 24 and the third supply pipe 26 are provided with switching valves 27 and 28 for switching the supply of fluid, respectively. An on-off valve 30 is provided in a supply pipe 29 that connects the second supply pipe 24 and the shielding material supply hopper 25.

  On the other hand, the shielding material recovery device 13 is a fluid and shielding material recovery line for the shielding container 11, and includes a tank unit 21, a first discharge pipe 31, a second discharge pipe 32, and a third discharge pipe 33. It is configured. The first discharge pipe 31 and the third discharge pipe 33 are provided with switching valves 34 and 35 for switching between discharging the fluid and discharging the fluid and the shield, respectively.

  As the shielding material filling device 12, the first discharge pipe 31 and the second discharge pipe 32 of the recovery line also function. Further, as the shielding material recovery device 13, the first supply pipe 22, the pump 23, and the third supply pipe 26 of the supply line also function.

  That is, the tank unit 21 includes a water storage part 41 that supplies the shielding container 11 with the fluid discharged from the shielding container 11 and a separation part 42 that separates the shielding material collected from the shielding container 11 from the fluid. Have. One end of the first supply pipe 22 is connected to the water storage part 41 of the tank unit 21, and the other end is branched into a second supply pipe 24 and a third supply pipe 26. The first supply pipe 22 is equipped with a pump 23, and the second supply pipe 24 and the third supply pipe 26 are equipped with switching valves 27 and 28, respectively.

  The shielding material supply hopper 25 stores a large number of shielding materials and drops the shielding material by a fixed amount from a bottom-open funnel-type bottom opening. The shielding material supply hopper 25 is connected to the second supply pipe 24 by a supply pipe 29, and an open / close valve 30 is attached to the supply pipe 29.

  The second discharge pipe 32 has one end connected to the separation part 42 of the tank unit 21 and the other end branched to a first discharge pipe 31 and a third discharge pipe 33. The first discharge pipe 31 and the third discharge pipe 33 are equipped with switching valves 34 and 35, respectively.

  The shielding container 11 includes a container body 51 having a hollow shape, a supply unit 52 capable of supplying a fluid and a shielding material to the inside of the container body 51, and a discharge capable of discharging the fluid and the shielding material inside the container body 51. Part 53.

  The shielding container 11 is provided with a first supply part 54 capable of supplying a fluid and a shielding material at the upper part of the container body 51 as the supply part 52, and a second supply part capable of supplying only the fluid to the lower part of the container body 51. 55 is provided. Further, the shielding container 11 is provided as the discharge part 53 at the upper part of the container main body 51 and can discharge only the fluid, and the lower part of the container main body 51 can discharge the fluid and the shielding material. A second discharge portion 57 is provided.

  In addition, the container main body 51 is provided with a filter (not shown) so that only the fluid is discharged to the first discharge portion 56 and the shielding material is not discharged. Further, the container main body 51 is provided with a recovery nozzle 72 (see FIG. 1), which will be described later, so that not only water but also a shielding material is discharged to the second discharge portion 57.

  In the shielding container 11, the second supply pipe 24 is connected to the first supply part 54, and the third supply pipe 26 is connected to the second supply part 55. In the shielding container 11, the first discharge pipe 31 is connected to the first discharge part 56, and the third discharge pipe 33 is connected to the second discharge part 57.

  Here, the 2nd supply part 55 and the 2nd discharge part 57 in the shielding container 11 are demonstrated in detail. As shown in FIG. 1, the container body 51 is configured by fixing the vertical wall portions 62 and 63 so as to face both sides of the bottom portion 61, and the second supply portion 55 is provided on the vertical wall portion 62 side. A second discharge part 57 is provided on the part 63 side. The second supply unit 55 and the second discharge unit 57 are arranged to face each other in the horizontal direction.

  In the second supply portion 55, the vertical wall portion 62 has a circular supply opening 64 formed at a predetermined position, and an injection nozzle 65 is attached to the supply opening 64. The injection nozzle 65 has an injection port 66 that expands toward the inside of the container body 51. The vertical wall portion 62 is provided with a mounting base 67 on the outer wall surface corresponding to the supply opening 64, and the third supply pipe 26 is connected to the mounting base 67 via a connecting pipe 68 and fixed by a locking ring 69. Has been.

  On the other hand, in the second discharge portion 57, the vertical wall portion 63 is formed with a circular discharge opening 71 at a predetermined position, and a recovery nozzle (shielding material recovery nozzle) 72 is attached to the discharge opening 71. The vertical wall portion 63 is provided with a mounting base 73 on the outer wall surface corresponding to the discharge opening 71, a recovery nozzle 72 is fixed to the mounting base 73, and the third discharge pipe 33 is connected via the recovery nozzle 72, It is fixed by a locking ring 74.

  The container body 51 has a bottom plate 61a disposed on the bottom 61, and the lower surface height of the supply opening 64, the lower surface height of the discharge opening 71, and the upper surface height of the bottom plate 61a are substantially the same height.

  As illustrated in FIGS. 1 to 4, the recovery nozzle 72 includes a nozzle body 81, a covering portion 82, and a passage portion 83.

  The nozzle body 81 is provided with an opening 91 having a cylindrical shape and a circular shape on the inside, and a plurality of (four in the present embodiment) mounting holes 93 are formed in the outer peripheral flange 92 having a disk shape. A threaded portion 94 is formed on the outer peripheral surface of the end portion on the outlet side (right side in FIG. 2) to which the end portion of the third discharge pipe 33 is fitted. Therefore, a plurality of recovery nozzles 72 (four in the present embodiment) are fitted in the discharge opening 71 of the vertical wall 63 from the outside of the container body 51 and the outer peripheral flange 92 is in close contact with the outer surface of the mounting base 73. ) Bolt 95 passes through each mounting hole 93 and is screwed into mounting base 73, so that it is fixed to container body 51.

  The covering portion 82 is provided so as to block a part of the inlet side (left side in FIG. 2) of the opening 91 of the nozzle body 81, so that the fluid can pass and the shielding material cannot pass. Yes. The passage portion 83 is provided outside the region covered by the covering portion 82 in the opening 91 of the nozzle body 81, and allows fluid and shielding material to pass therethrough.

  The nozzle body 81 has a protection plate (protection part) 101 formed by extending the upper part on the inlet side to the inside of the container body 51 over a predetermined angular range in the circumferential direction. The protective plate 101 has an arc shape along the upper edge of the opening 91, and protrudes from the inner surface of the vertical wall portion 63 to the inside of the container main body 51 by a predetermined distance.

  The covering portion 82 includes a first covering portion 102 provided at the lower portion of the protection plate 101 and a second covering portion 103 provided at the leading end portions of the protection plate 101 and the first covering portion 102. The first covering portion 102 is formed by a mesh material (such as a wire mesh) so as to have a rectangular planar shape, and is fixed so as to close a lower portion of the protective plate 101 having a substantially semicircular shape when viewed from the front (FIG. 3). ing. The second covering portion 103 is formed of a mesh material (such as a wire mesh) so as to form a substantially semicircular planar shape, and the protective plate 101 and the first covering portion 102 that are substantially semicircular when viewed from the front (FIG. 3). It is fixed to close the front.

  Therefore, the covering portion 82 constituted by the first covering portion 102 and the second covering portion 103 is extended from the nozzle body 81 to the inlet side, so that the inside of the discharge opening 71 in the vertical wall portion 63 of the container body 51 is provided. In addition to being disposed, the distal end portion is disposed so as to protrude inside the container body 51 from the inner wall surface of the vertical wall portion 63, and the protection plate 101 is disposed above the covering portion 82.

  The passage portion 83 is provided outside the region blocked by the covering portion 82 at the opening 91 of the nozzle body 81, that is, below the covering portion 82, and has a substantially semicircular shape.

  In this embodiment, the area (surface area) of the covering portion 82 (the first covering portion 102 and the second covering portion 103) is set larger than the area area (opening area) of the passage portion 83. In this case, when the opening area of the opening 91 of the nozzle body 81 is 100%, the area (surface area) of the covering 82 is preferably 140% or more, and most preferably 150%. Note that if the area (surface area) of the covering portion 82 is smaller than 140%, the amount of fluid passing therethrough may be reduced and the shielding material may not be properly discharged. Further, if the area (surface area) of the covering portion 82 is larger than 150%, the shielding material can be properly discharged, but the amount of fluid passing therethrough may increase, and it may take a long time to collect the shielding material. is there.

  In the present embodiment, the area of the covering portion 82 in the opening 91 of the nozzle body 81 is set larger than the area of the passage portion 83. That is, when the recovery nozzle 72 is viewed from the front (FIG. 3), the apparent area of the covering portion 82 is set to be larger than the area of the passage portion 83. In this case, when the opening area of the opening 91 of the nozzle body 81 is 100%, the area of the passage 83 is preferably 30% to 50%, and most preferably 40%. That is, as shown in FIG. 3, the opening 91 of the nozzle body 81 has the first covering portion 102 disposed below the horizontal center line C2 when the center O is at the intersection of the two center lines C1 and C2. Has been. If the area of the passage portion 83 is smaller than 30%, the shielding material can be discharged properly, but the amount of the shielding material that passes through may decrease, and it may take a long time to collect the shielding material. Further, if the area of the passage portion 83 is larger than 50%, the amount of passage of the shielding material may increase, and this shielding material may not be properly discharged.

  Furthermore, in this embodiment, the shielding material is spherical and the outer diameter is 3 mm. Therefore, the covering part 82 needs to make the size of one opening smaller than 3 mm through which the shielding material cannot pass. Moreover, the passage part 83 needs to be larger than 3 mm through which the shielding material can pass. The opening 91 of the nozzle body 81 has an inner diameter of 50 mm, and it is desirable that the shielding material flowing through the third discharge pipe 33 after being discharged through the opening 91 has a density with respect to the fluid of about 60%. .

  In the radiation shielding apparatus of the present embodiment configured as described above, as shown in FIG. 5, the shielding material filling method by the shielding material filling apparatus 12 transfers the fluid and the shielding material from the first supply unit 54 to the shielding container 11. The first filling step of supplying the inside and increasing the internal pressure and the second filling step of pumping only the fluid inside from the first discharge part 56 to the outside by the internal pressure of the shielding container 11 are provided. Further, the shielding material recovery method by the shielding material recovery device 13 is provided by the first recovery step of increasing the internal pressure by supplying fluid from the second supply unit 55 to the inside of the shielding container 11 and the internal pressure of the shielding container 11. A second recovery step of pumping fluid and shielding material from the second discharge part 57 to the outside.

  Hereinafter, a radiation shielding method by the radiation shielding apparatus of the present embodiment will be described.

  First, the shielding container 11 which comprises a radiation shielding apparatus is arrange | positioned around the to-be-shielded body P. FIG. Next, the shielding material filling device 12 and the shielding material recovery device 13 are attached to the shielding container 11. Specifically, the second supply pipe 24 is connected to the first supply part 54 of the shielding container 11, and the third supply pipe 26 is connected to the second supply part 55. Further, the first discharge pipe 31 is connected to the first discharge part 56 of the shielding container 11, and the third discharge pipe 33 is connected to the second discharge part 57.

  In this state, the switching valve 27 is opened to close the switching valve 28, and the switching valve 34 is opened to close the switching valve 35. When the pump 23 is operated, the water in the tank unit 21 is supplied from the first supply unit 54 to the inside of the shielding container 11 through the first supply pipe 22 and the second supply pipe 24, and the inside of the shielding container 11 is fluid. It is filled. Subsequently, when the on-off valve 30 is opened, a large number of shielding materials are supplied from the shielding material supply hopper 25 to the second supply piping 24 through the supply piping 29. Therefore, many shielding materials are supplied to the inside of the shielding container 11 from the 1st supply part 54 through the 2nd supply piping 24 with the fluid, and a shielding material is gradually deposited on the bottom part. At this time, since the pressure of the shielding container 11 increases due to the supply of the fluid and the shielding material, the fluid is pushed out through the filter of the first discharge part 56, and the tank unit 21 passes through the first discharge pipe 31 and the second discharge pipe 32. It returns to and circulates.

  After that, when the shielding container 11 is sufficiently supplied and filled with the shielding material, the shielding container 11 closes the on-off valve 30 and shields the shielding material from the shielding material supply hopper 25 to the second supply pipe 24 through the supply pipe 29. Stop supplying. Subsequently, the operation of the pump 23 is stopped, the switching valve 27 is closed, and the switching valve 34 is closed. Then, the supply of the fluid and the shielding material to the shielding container 11 is stopped, and as a result, the shielding container 11 is filled with an appropriate amount of the fluid and the shielding material.

  The shielding container 11 is filled with a large number of shielding materials, and can shield the outside of the shielded body P and protect it from radiation. Therefore, the operator can perform various operations around the outside of the shielded body P whose radiation is shielded by the shielding container 11. And if the various operation | work with respect to the to-be-shielded body P is completed, a radiation shielding apparatus will be removed.

  First, the switching valve 27 is closed and the switching valve 28 is opened, and the switching valve 34 is closed and the switching valve 35 is opened. When the pump 23 is operated, the water in the tank unit 21 is supplied from the second supply unit 55 to the inside of the shielding container 11 through the first supply pipe 22 and the third supply pipe 26. Therefore, since the pressure of the shielding container 11 is increased by the supply of the fluid, the fluid and the shielding material are pushed out through the recovery nozzle 72 of the second discharge part 57, and the tank unit is passed through the third discharge pipe 33 and the second discharge pipe 32. It returns to 21 and a shielding material is collect | recovered and fluid circulates.

  That is, as shown in FIGS. 1 and 2, when the fluid is supplied to the second supply unit 55, the shielding container 11 ejects the fluid from the ejection nozzle 65 into the container body 51. Then, in the container main body 51, a large number of shielding materials filled together with the fluid are dispersed, and the internal pressure rises. Then, the fluid and the shielding material in the container main body 51 are pushed out from the collection nozzle 72.

  At this time, the fluid is discharged through all regions of the opening 91 in the nozzle body 81 including the covering portion 82 and the passage portion 83. On the other hand, the shielding material cannot pass through the covering portion 82 and is discharged only from the passage portion 83. The amount of the shielding material passing through the opening 91 is limited by the covering portion 82, and the density of the shielding material with respect to the fluid becomes an appropriate density, for example, 60%. Therefore, the shielding material does not block the third discharge pipe 33, and the third discharge pipe 33 can be efficiently recovered in a short time.

  Although the shielding material adheres to the surface of the covering portion 82, particularly the second covering portion 103, the opening of the covering portion 82 is sufficiently smaller than the outer diameter of the shielding material, so that the shielding material covers all of the covering portion 82. This area is not blocked.

  Further, since the recovery nozzle 72 of the second discharge unit 57 is disposed in the horizontal direction with respect to the injection nozzle 65 of the second supply unit 55, the injection is performed from the injection nozzle 65 of the second supply unit 55. By the fluid, the shielding material is guided to the collection nozzle 72 side of the second discharge part 57, and the shielding material in the container main body 51 can be properly discharged.

  Thereafter, when all the shielding material inside is discharged and collected, the shielding container 11 stops the operation of the pump 23, closes the switching valve 28, and closes the switching valve 35, as shown in FIG. . Then, the supply of fluid to the shielding container 11 is stopped, and as a result, the shielding container 11 is in a state where only the fluid is filled therein. Therefore, the second supply pipe 24 is removed from the first supply part 54 of the shielding container 11, and the third supply pipe 26 is removed from the second supply part 55. Further, the first discharge pipe 31 is removed from the first discharge part 56 of the shielding container 11, and the third discharge pipe 33 is removed from the second discharge part 57. Thus, the shielding material filling device 12 and the shielding material recovery device 13 are removed from the shielding container 11. And by removing the shielding container 11 from the periphery of the shielded body P, the radiation shielding apparatus is removed, and all operations are completed.

  As described above, in the shielding material recovery nozzle 72 of the present embodiment, the nozzle body 81 having the opening 91 and the part of the opening 91 are provided so as to block a part of the fluid, and the shielding material is provided. A covering portion 82 that cannot pass through and a passage portion 83 that is provided outside the region of the opening 91 that is covered by the covering portion 82 and through which a fluid and a shielding material can pass are provided.

  Therefore, the fluid is discharged through the entire region of the opening 91 including the covering portion 82 and the passage portion 83, and the shielding material is discharged only from the passage portion 83 without passing through the covering portion 82. . Therefore, the amount of the shielding material that passes through the opening 91 can be limited, and the density of the shielding material with respect to the fluid can be set to an appropriate density. Therefore, the opening 91 is not blocked by the shielding material, and the shielding material can be efficiently collected in a short time. Thus, the passage portion 83 can be secured simply by providing the covering portion 82 so as to block a part of the opening 91 of the nozzle body 81, and the structure can be simplified and lightened, and the shielding function can be achieved. Can be improved.

  In the shielding material recovery nozzle 72 of the present embodiment, the area area of the covering portion 82 is set larger than the area area of the passage portion 83. Further, the area of the covering portion 82 in the opening 91 is set larger than the area of the passage portion 83. Therefore, it is possible to efficiently collect the shielding material in a short time by preventing the covering portion 82 from being blocked by the shielding material and securing a sufficient area of the covering portion 82.

  In the shielding material recovery nozzle 72 of the present embodiment, the covering portion 82 is made of a mesh material. Therefore, the structure can be simplified and the cost can be reduced.

  In the shielding material recovery nozzle 72 of this embodiment, a covering portion 82 is extended to the inlet side of the nozzle body 81. Therefore, the amount of protrusion to the outlet side can be reduced and the increase in size of the apparatus can be suppressed.

  In the shielding material recovery nozzle 72 of the present embodiment, the passage portion 83 is disposed below the covering portion 82, and the protection plate 101 is provided above the covering portion 82. Therefore, when the shielding material falls from above, the shielding material collides with the protective plate 101, so that contact with the covering portion 82 is suppressed, and damage to the covering portion 82 can be prevented. Further, the dropped shielding material can be efficiently discharged from the passing portion 83 located below.

  In the shielding material recovery nozzle 72 of the present embodiment, the opening 91 is circular, the protective plate 101 is formed in an arc shape along the upper edge of the opening 91, and the first covering portion 102 is provided as a covering portion 82 below the protective plate 101. Provided. Therefore, when the protective plate 101 has an arc shape along the upper edge of the opening 91, the shielding material dropped from above is suppressed from being deposited on the protective plate 101, and the shielding material can be properly collected. .

  In the shielding material recovery nozzle 72 of the present embodiment, the protective plate 101 and the second covering portion 103 are provided as the covering portion 82 at the tip of the first covering portion 102. Therefore, a sufficient area of the covering portion 82 can be ensured.

  Further, in the shielding container 11 of the present embodiment, the container body 51 having a hollow shape, the supply unit 52 capable of supplying fluid and shielding material to the inside of the container body 51, and the fluid in the container body 51 are provided. And a discharge portion 53 capable of discharging the shielding material, and a recovery nozzle 72 is attached to the discharge portion 53.

  Accordingly, when a fluid is supplied from the supply unit 52 to the inside of the container main body 51, the pressure in the container main body 51 rises, so that the fluid and the shielding material inside the container main body 51 are pushed out from the discharge unit 53. At this time, the fluid is discharged through the entire area of the opening 91 including the covering portion 82 and the passage portion 83, and the shielding material is discharged only from the passage portion 83 without passing through the covering portion 82. Become. Therefore, the amount of the shielding material that passes through the opening 91 can be limited, and the density of the shielding material with respect to the fluid can be set to an appropriate density. Therefore, the opening 91 is not blocked by the shielding material, and the shielding material can be efficiently collected in a short time. Thus, the passage portion 83 can be secured simply by providing the covering portion 82 so as to block a part of the opening 91 of the nozzle body 81, and the structure can be simplified and lightened, and the shielding function can be achieved. Can be improved.

  In the shielding container 11 of the present embodiment, the covering portion 82 extends inward from the inner wall surface of the container body 51. Therefore, the covering portion 82 can be disposed in the discharge opening 71 of the vertical wall portion 63 of the container main body 51, the amount of protrusion to the inside of the container main body 51 can be reduced, and the increase in size of the apparatus can be suppressed. it can.

  In the shielded container 11 of the present embodiment, as the supply unit 52, a first supply unit 54 provided on the upper part of the container main body 51 and capable of supplying fluid and shielding material, and a lower part of the container main body 51 for supplying only the fluid. A second supply section 55 that can be supplied is provided, and a discharge section 53 is provided at the upper part of the container main body 51 to discharge only the fluid, and provided at the lower part of the container main body 51 for fluid and shielding. A second discharge portion 57 capable of discharging the material is provided. Accordingly, the first supply part 54 and the first discharge part 56 for filling the inside of the container main body 51 with the shielding material are provided, and the second supply part 55 for recovering the shielding material inside the container main body 51; By providing the 2nd discharge part 57, filling and collection | recovery of the shielding material with respect to the container main body 51 can be performed efficiently.

  In the shielding container 11 of the present embodiment, the second supply unit 55 and the second discharge unit 57 are arranged to face each other in the horizontal direction. Accordingly, the fluid supplied from the second supply unit 55 to the inside of the container main body 51 is ejected to the second discharge unit 57 side, and the shielding material inside the container main body 51 is guided to the second discharge unit 57. Thus, the shielding material can be efficiently recovered.

  Further, in the shielding material recovery apparatus 13 of the present embodiment, the supply pipes 22 and 26 that can supply fluid to the shielding container 11, the pump 23 provided in the first supply pipe 22, and the inside of the shielding container 11. Discharge pipes 32 and 33 capable of discharging a fluid and a shielding material and a recovery nozzle 72 provided in the second discharge part 57 of the shielding container 11 and connected to the third discharge pipe 33 are provided.

  In the shielding material recovery method of the present embodiment, the fluid is supplied from the second supply unit 55 to the inside of the shielding container 11 to increase the internal pressure, and the internal pressure of the shielding container 11 is used to increase the internal pressure. A second recovery step of pumping a fluid and a shielding material from the second discharge part 57 to the outside using the shielding material recovery nozzle 72;

  In the shielding material recovery method by the shielding material recovery device 13, when the fluid is supplied from the second supply unit 55 to the inside of the shielding container 11 through the supply pipes 22 and 26 by operating the pump 23, the pressure in the shielding container 11 is increased. Therefore, the fluid and the shielding material inside the shielding container 11 are pushed out from the second discharge part 57 to the third discharge pipe 33. Therefore, the amount of the shielding material passing through the opening 91 can be limited, and the density of the shielding material with respect to the fluid can be set to an appropriate density. Therefore, the opening 91 is not blocked by the shielding material, and the shielding material can be efficiently collected in a short time. Thus, the passage portion 83 can be secured simply by providing the covering portion 82 so as to block a part of the opening 91 of the nozzle body 81, and the structure can be simplified and lightened, and the shielding function can be achieved. Can be improved.

  In the above-described embodiment, the covering portion 82 extends to the inlet side with respect to the passage portion 83 of the recovery nozzle 72. However, the covering portion 82 may be disposed in the same position as the passage portion 83 with a flat surface. In addition, the covering portion 82 is provided above the recovery nozzle 72 and the passage portion 83 is provided below. However, the present invention is not limited to this configuration. For example, the passage portion 83 is provided above the recovery nozzle 72 and below. The covering portion 82 may be provided, or the passage portion 83 may be provided at the center of the covering portion 82.

  In the above-described embodiment, the covering portion 82 is configured by the first covering portion 102 and the second covering portion 103, but the second covering portion 103 may be used as a passage portion or a closing portion. Further, although the protective plate 101 is arc-shaped, it may be triangular or quadrangular.

  In the above-described embodiment, the supply unit 52 includes the first supply unit 54 at the upper part of the container body 51 and the second supply unit 55 at the lower part of the container body 51, and the first upper part of the container body 51 as the discharge unit 53. Although the discharge part 56 and the second discharge part 57 below the container body 51 are provided, the present invention is not limited to this configuration. For example, the supply unit 52 may be one of the first supply unit 54 and the second supply unit 55, or may be a supply unit provided at another position, and may also have a function.

  Moreover, in the Example mentioned above, although the shielding container was made into ring shape, the shape can be suitably changed according to the shape of a to-be-shielded body.

  Further, in the above-described embodiment, the description has been made by applying the present invention to the case where work such as maintenance inspection and repair of a nuclear power plant is performed. However, the present invention is not limited to this place.

DESCRIPTION OF SYMBOLS 11 Shield container 12 Shielding material filling apparatus 13 Shielding material collection | recovery apparatus 21 Tank unit 22 1st supply piping 23 Pump 24 2nd supply piping 25 Shielding material supply hopper 26 3rd supply piping 31 1st discharge piping 32 2nd discharge piping 33 3rd discharge piping 51 Container main body 52 Supply part 53 Discharge part 54 1st supply part 55 2nd supply part 56 1st discharge part 57 2nd discharge part 71 Discharge opening 72 Collection | recovery nozzle (shielding material collection | recovery nozzle)
81 Nozzle body 82 Covering part 83 Passing part 91 Opening part 101 Protection plate (protection part)
102 1st coating | coated part 103 2nd coating | coated part P To-be-shielded body

Claims (14)

A nozzle body having an opening;
A covering portion that is provided so as to block a part of the opening and through which a fluid can pass and a shielding material cannot pass;
A passage portion provided outside the region of the opening that is covered by the covering portion and through which the fluid and the shielding material can pass;
A shielding material recovery nozzle comprising:   The shielding material recovery nozzle according to claim 1, wherein a region area of the covering portion is set larger than a region area of the passage portion.   3. The shielding material recovery nozzle according to claim 1, wherein an area of the covering portion in the opening is set larger than an area of the passage portion.   The shielding member recovery nozzle according to claim 1, wherein the covering portion is made of a mesh material.   5. The shielding material recovery nozzle according to claim 1, wherein the nozzle body has the covering portion extending on an inlet side.   The shielding material recovery nozzle according to claim 5, wherein a protective part is provided above the covering part.   The opening has a circular shape, the protection part has an arc shape along the upper edge of the opening, and the covering part has at least a first covering part provided at a lower part of the protecting part. The shielding material recovery nozzle according to claim 6.   The shielding member recovery nozzle according to claim 7, wherein the covering portion includes a second covering portion provided at a tip portion of the protection portion and the first covering portion. A hollow container body,
A supply unit capable of supplying fluid and shielding material into the container body;
A discharge part capable of discharging the fluid and the shielding material inside the container body;
Have
The shielding member recovery nozzle according to any one of claims 1 to 8 is attached to the discharge portion.
A shielding container characterized by that.   The shielding container according to claim 9, wherein the covering portion extends inward from an inner wall surface of the container main body.   The supply unit includes a first supply unit provided at an upper part of the container body and capable of supplying a fluid and a shielding material, and a second supply unit provided at a lower part of the container body and capable of supplying only a fluid. The discharge part is provided at the upper part of the container body and can discharge only fluid, and the second discharge part is provided at the lower part of the container body and can discharge fluid and shielding material. The shielding container according to claim 9 or 10, wherein:   The shielding container according to claim 11, wherein the second supply unit and the second discharge unit are disposed to face each other in the horizontal direction. A supply line capable of supplying fluid to the shielding container;
A pump provided in the supply line;
A discharge line capable of discharging the fluid and the shielding material inside the shielding container;
The shielding material recovery nozzle according to any one of claims 1 to 8, wherein the shielding material recovery nozzle is provided at a discharge portion of the shielding container and connected to the discharge line;
A shielding material collecting apparatus comprising: A first step of supplying fluid from the supply unit to the inside of the shielding container to increase the internal pressure;
A second step of pumping the fluid and the shielding material inside by the internal pressure of the shielding container from the discharge unit to the outside using the shielding material recovery nozzle according to any one of claims 1 to 8;
Having
The shielding material collection method characterized by the above-mentioned.

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