JP6549006B2 - Surface treatment system and surface treatment method - Google Patents

Description

  Embodiments of the present invention relate to a surface treatment system and a surface treatment method that prevent the growth of corrosion that has occurred on wall surfaces in a nuclear reactor.

  Corrosion may occur on the wall of the metal structure in the reactor. For example, when an event occurs in which seawater flows into the reactor pressure vessel, corrosion occurs on the inner wall surface of the reactor pressure vessel. If such corrosion is left as it is, the corrosion may grow and the integrity of the reactor may be impaired. In addition, so-called stress corrosion cracking may occur in the metal material constituting the pressure vessel due to the synergistic action of the corrosion and the tensile stress.

  When a crack occurs in a member due to stress corrosion cracking, in general, the development of a non-penetrating crack not penetrating the member is prevented, and in the case of a penetrating crack penetrating the member, the penetrating In addition to preventing the growth of the crack, it is necessary to prevent the coolant from leaking from the through crack.

  As a method of repairing non-penetrating cracks and penetrating cracks due to such stress corrosion cracking, "sealing welding" has been proposed (see, for example, Patent Document 1). Seal welding prevents the growth of a crack due to stress corrosion cracking and prevents the leakage of the coolant by covering the opening of the crack caused by stress corrosion cracking with overlay welding. In the case of seal welding, the case where overlay welding is directly applied to the wall surface (original surface) where the opening of the crack is confirmed, and the case where overlay welding is applied to the wall surface (original surface) after being subjected to insert processing is there.

JP 2007-206026 A

  By the way, the corrosion which arises in the wall surface in a nuclear reactor has some which are evaluated as a size which does not affect the soundness of the pressure vessel concerned so much, for example. However, such corrosion may grow under the influence of oxygen (so-called dissolved oxygen) contained in cooling water, for example. For such corrosion, it is better to shut off the corrosion from the external environment and stop the growth of the corrosion instead of removing the corrosion completely by applying processing to the wall surface, etc. It may be advantageous in ensuring the integrity of the structures in the reactor.

  An embodiment of the present invention is made in view of the above-mentioned situation, and it aims at providing the surface treatment technology which can prevent the growth of the corrosion which arose in the wall surface in a nuclear reactor.

In order to achieve the above-mentioned object, the surface treatment system of the embodiment of the present invention comprises an adsorption mechanism for adsorbing to a wall surface in the coolant of the reactor in a nuclear reactor, and a movement for moving along the wall surface. A mechanism having a surface information acquisition unit capable of acquiring surface information of the wall surface, and a chamber capable of covering a part of the wall surface, which is supplied with a solution to the chamber and covered by the chamber And a surface treatment mechanism capable of performing surface treatment on a part of the wall, wherein the movable body movable along the wall and the cooling liquid can be discharged from the inside of the chamber , and the solution for forming the plating layer is a solution management system that can be supplied to the chamber, based on the surface information acquired by the surface information acquisition unit, and the specific surface capable of information processing apparatus a portion corrosion occurs among the wall surfaces, wherein said surfaces Processing machine , The surface processing apparatus is specified portion covered with the chamber, is constructed from the solution management device so as to form a plating layer covering the corrosion supplied with the plating layer forming solution, the adsorption mechanism Is characterized in that it includes a propeller that is rotated to suction the surrounding coolant .

Further, according to the surface treatment method of the embodiment of the present invention, an adsorbing mechanism for adsorbing by the propeller which sucks the surrounding coolant by rotation on the wall in the coolant of the reactor in the reactor, and A moving mechanism for moving along the surface, a surface information acquisition unit capable of acquiring surface information of the wall surface, and a chamber capable of covering a part of the wall surface, and the supply of the solution to the chamber And a surface processing mechanism capable of performing surface processing on a part of the wall surface covered by the chamber, and the surface processing method using a movable body movable along the wall surface, body a on the basis of the surface information obtained by the surface information acquisition unit by moving along the wall surface, a step of surface processing device to specify partial corrosion occurs among the wall surfaces, said surface processing mechanism Of the above In Yanba the steps covered by the coolant surrounding the identified portion corrosion occurs, as well as discharging the cooling liquid in the chamber, the solution management device supplies an oxide film removing solution to the chamber And removing the oxide film on the wall surface covered by the chamber, and after the oxide film is removed, the solution management apparatus supplies the plating layer forming solution to the chamber to plate the corrosion. Forming a layer in the coolant of the nuclear reactor .

  According to the surface treatment system and the surface treatment method of the embodiment of the present invention, the corrosion generated on the wall surface in the reactor can be shielded from the external environment to prevent the growth of the corrosion.

It is a fragmentary sectional view of a reactor pressure vessel where a surface treatment stop method of a 1st embodiment is applied, and a side is shown about a mobile. It is a longitudinal cross-sectional view of the reactor pressure vessel to which the surface treatment method of a 1st embodiment is applied. It is a top view which shows the structure of a movable body among the surface treatment systems of 1st Embodiment. It is a schematic diagram which shows the whole structure of the surface treatment system of 1st Embodiment. It is a longitudinal cross-sectional view which shows the structure of the surface treatment mechanism of the surface treatment system of 1st Embodiment, and is a figure which shows the aspect which the opening edge contacted the inner wall. It is the external view which looked at the surface treatment mechanism of the surface treatment system of 1st Embodiment from the opening edge side. It is sectional drawing of the corrosion periphery explaining the surface treatment method of 1st Embodiment, (a) shows the aspect by which the oxide film is formed around corrosion, (b) is an oxide film. It shows an aspect in which an inner plating layer is formed to cover corrosion after removal, and (c) shows an aspect in which an outer plating layer is further formed after the inner plating layer is formed. It is a top view which shows the structure of a movable body among the surface treatment systems of 2nd Embodiment.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiments described below, and various modifications can be made without departing from the scope of the invention.

First Embodiment
The structure of the surface treatment system of 1st Embodiment is demonstrated using FIGS. 1-7. In each of the drawings, the vertically upper side is indicated by arrow U in the drawing, and the vertically lower side is indicated by arrow D in the drawing. Further, the radially inner side of the reactor pressure vessel is indicated by an arrow R1 in the figure. In FIG. 1, FIG. 2 and FIG. 4, hatching is appropriately omitted to facilitate understanding.

  FIG. 1 is a partial cross-sectional view of a reactor pressure vessel to which the surface treatment method of the present embodiment is applied, and the side of the movable body is shown. FIG. 2 is a longitudinal sectional view of a reactor pressure vessel to which the surface treatment method of the present embodiment is applied. FIG. 3 is a top view showing the configuration of a movable body in the surface treatment system of the present embodiment. FIG. 4 is a schematic view showing the overall configuration of the surface treatment system of the present embodiment.

  FIG. 5 is a longitudinal cross-sectional view showing the configuration of the surface treatment mechanism of the surface treatment system of the present embodiment, and is a view showing an aspect in which the opening edge is in contact with the inner wall. FIG. 6 is an external view of the surface treatment mechanism of the surface treatment system of the present embodiment as viewed from the opening edge side.

  In the present embodiment, “the wall surface in the reactor” is, for example, the inner wall 3 of the reactor pressure vessel 1 accommodating the core of the boiling water reactor (BWR) as shown in FIG. The case of preventing the growth of the generated corrosion will be described. The inner wall 3 is made of a metal material such as stainless steel.

  As shown in FIG. 2, the reactor pressure vessel 1 of the present embodiment is used for an improved boiling water reactor (ABWR), and an internal pump (not shown) for circulating a coolant (light water) is used. It has built-in. A core shroud 4 surrounding the core is formed radially inside the reactor pressure vessel 1. As shown in FIGS. 1 and 2, a pump deck 2 is provided between the core shroud 4 and the reactor pressure vessel 1. The coolant is pumped between the core shroud 4 and the reactor pressure vessel 1 by the internal pump installed in the pump deck 2 and flows vertically downward.

  As shown in FIG. 1, a movable body (so-called “mobile robot”) 11 movable along the inner wall 3 of the surface treatment system is located on the inner wall 3 of the reactor pressure vessel 1. The movable body 11 is configured to be movable along an inner wall 3 extending in the vertical direction.

  As shown in FIG. 3, the moving body 11 has an adsorption mechanism 15 for adsorbing to the inner wall 3, a movement mechanism 16 for moving along the inner wall 3, and a surface information acquisition unit 17 capable of acquiring surface information of the inner wall 3. And a surface treatment mechanism 20 capable of performing various surface treatments in the vicinity of the corrosion of the inner wall 3.

  As shown in FIG. 3, the suction mechanism 15 of the present embodiment is configured as a so-called thruster, and has a plurality of propellers (or fans) 15a and a motor (not shown) for rotationally driving the propellers 15a. ing. The propeller 15a is rotationally driven by a motor and sucks a fluid (for example, a coolant) from the inner wall 3 side of the movable body 11. Thereby, the adsorption | suction mechanism 15 can adsorb | suck to the desired position among the inner walls 3, and can position the mobile body 11 in the said desired position. Further, the suction mechanism 15 can release the suction on the inner wall 3 by reversing the propeller 15 a.

  The moving mechanism 16 has a plurality of drive wheels 16a that generate driving force between the inner wall 3 in contact with the inner wall 3 and a motor (not shown) that rotationally drives the drive wheel 16a. The driving wheel 16a is rotationally driven by a motor (not shown) to drive the movable body 11 in a direction along the inner wall 3 (vertical direction in FIG. 3) between the driving wheel 16a and the inner wall 3 Give rise to Thereby, the moving mechanism 16 can move the movable body 11 to a desired position along the inner wall 3. The moving mechanism 16 is controlled by a controller 55 (see FIG. 4) described later.

  The surface information acquisition unit 17 has an image sensor 17 a capable of imaging a predetermined range of the inner wall 3. The image sensor 17 a is disposed on the bottom of the movable body 11 so as to face the inner wall 3. The surface information acquisition unit 17 transmits the image data captured by the image sensor 17a to a surface information processing apparatus described later via the cable 18 (see FIG. 4).

  As shown in FIG. 4, an operation floor (also referred to as an operating floor) 5 of the reactor building is provided vertically above the reactor pressure vessel 1. On the operation floor 5, a surface information processing apparatus 51 capable of identifying a portion of the inner wall 3 where corrosion has occurred based on the surface information acquired by the surface information acquisition unit 17 is disposed. The surface information processing apparatus 51 of the present embodiment is configured as an image processing apparatus that processes an image captured by the image sensor 17a. More specific functions of the surface information processing apparatus 51 will be described later.

  The surface treatment mechanism 20 has a chamber 26 capable of covering a portion of the inner wall 3 where corrosion has occurred, as shown in FIGS. 3 and 5. The surface treatment mechanism 20 is configured such that an opening edge 27 defining the chamber 26 can contact the inner wall 3. In the present embodiment, the chamber 26 has a substantially hemispherical shape, and the opening edge 27 has a substantially annular shape.

  In the following description, the central axis direction of the opening edge 27 in the direction perpendicular to the inner wall 3 and in close contact with the inner wall 3 is simply described as “axial direction” and indicated by the arrow A in the drawing. Moreover, the direction orthogonal to the said axial direction is only described as "radial direction."

  Of the movable body 11 shown in FIG. 3, the surface treatment mechanism 20 is configured to be relatively movable in the axial direction with respect to the inner wall 3 as shown by the arrow A in FIG. The surface treatment mechanism 20 is axially driven by an actuator (not shown).

(electrode)
As shown in FIGS. 5 and 6, the chamber 26 of the surface treatment mechanism 20 is provided with two substantially annular electrodes 21 and 22. More specifically, the surface treatment mechanism 20 includes an electrode (hereinafter referred to as a first electrode) 21 disposed so as to contact the inner wall 3 when the opening edge 27 contacts the inner wall 3, and an opening edge When the portion 27 is in contact with the inner wall 3, it has an electrode (hereinafter referred to as a second electrode) 22 which is disposed at a distance from the inner wall 3 in the axial direction so as not to be in contact with the inner wall 3.

  The first electrode 21 is provided adjacent to the opening edge 27 in the chamber 26. As shown in FIG. 5, the first electrode 21 is configured to be in contact with the inner wall 3 together with the opening edge 27.

  The second electrode 22 is disposed radially inward of the first electrode 21 in the chamber 26 and at a position axially separated from the opening edge 27. The first electrode 21 and the second electrode 22 are used to form plating layers 43 and 44 described later.

(Tube, solution management device)
Further, as shown in FIG. 3, a tube bundle 30 in which a plurality of tubes for supplying or discharging various solutions are bundled is connected to the surface treatment mechanism 20. As shown in FIG. 4, on the operation floor 5, a solution management apparatus 53 for managing supply and discharge of various solutions is installed. A more specific function of the solution management device 53 will be described later.

  The tube bundle 30 is composed of a plurality of tubes 31, 32, 33, 34, as shown in FIG. Specifically, the tube bundle 30 includes various solutions from the first tube 31 for discharging various liquids in the chamber 26 to the solution management device 53 (see FIG. 4) and the solution management device 53 (see FIG. 4). Are supplied to the chamber 26.

  Specifically, a second tube 32 for supplying a solution for removing an oxide film (hereinafter referred to as a solution for removing an oxide film) and a solution for forming an inner plating layer 43 described later (hereinafter referred to as an inner plating) A third tube 33 for supplying a solution for forming a layer) and a fourth tube 34 for supplying a solution for forming an outer plating layer 44 described later (hereinafter referred to as a solution for forming an outer plating layer) doing.

  The solution management apparatus 53 shown in FIG. 4 is configured to be able to supply the oxide film removing solution, the inner plating layer forming solution, and the outer plating layer forming solution to the chamber 26 of the surface treatment mechanism 20, respectively. It is done. The solution for forming the inner plating layer contains a substance constituting the inner plating layer, and the solution for forming the outer plating layer contains a substance constituting the outer plating layer. The solution management device 53 is configured to be able to discharge the solution and the coolant from the chamber 26 via the first tube 31.

  The surface treatment mechanism 20 of the movable body 11 receives the solution for forming the plating layers 43 and 44 in the chamber 26, that is, the solution for forming the inner plating layer and the solution for forming the outer plating layer, and performs plating covering corrosion. The layers 43 and 44 (see FIG. 7) are formed.

  The solution management device 53 is operated by the operator in the device control room 57 via the controller 55. The operator in the device control room 57 checks the mobile body 11 and the solution management device 53 via the controller 55 while checking the image of the inner wall 3 captured by the surface information acquisition unit 17 via the surface information processing device 51. It is configured to be controllable.

(Method)
The surface treatment method by the surface treatment system of the present embodiment described above will be described using FIGS. 1 to 7. FIG. 7 is a cross-sectional view around corrosion explaining the surface treatment method of this embodiment, and (a) shows an aspect in which an oxide film is formed around corrosion, (b) shows And (c) show an embodiment in which an outer plating layer is further formed after the inner plating layer is formed, after the oxide film is removed and the inner plating layer is formed to cover the corrosion. It shows.

(Identify the part where corrosion is occurring)
First, as shown in FIG. 4, a portion of the inner wall 3 where corrosion is occurring is identified. In the present embodiment, the moving body 11 is moved along the inner wall 3 of the reactor pressure vessel 1 while the surface information acquiring unit 17 obtains surface information of the inner wall 3 to identify a portion where corrosion is occurring. . Specifically, the inner wall 3 is imaged by the image sensor 17a.

  The image data of the inner wall 3 acquired by the image sensor 17 a is sent to the surface information processing apparatus 51. The surface information processing apparatus 51 identifies the boundary between the inner wall 3 where corrosion does not occur and the corrosion based on the image data obtained from the moving body 11. Thereby, the surface information processing apparatus 51 identifies a portion of the inner wall 3 in which the corrosion 40 has occurred.

(Remove oxide film)
Next, the oxide film 41 in the vicinity of the corrosion 40 in the inner wall 3 is removed. In the present embodiment, as shown in FIGS. 5 and 7A, the surface treatment mechanism 20 is driven in the axial direction to bring the opening edge 27 into close contact with the inner wall 3 so that the chamber 26 covers the corrosion 40. .

  Then, when there is a coolant in the chamber 26, the coolant is discharged to the solution management device 53 through the first tube 31, and the solution for removing the oxide film from the solution management device 53 via the second tube 32. Supply 26 The surface treatment mechanism 20 receives the supply of the oxide film removal solution into the chamber 26 and chemically removes the oxide film 41 from the vicinity of the corrosion 40.

(Form an inner plating layer)
After removing the oxide film 41, as shown in FIG. 5 and FIG. 7 (b), the inner plating layer 43 is formed to cover the corrosion 40. In the present embodiment, the oxide film removing solution (waste fluid) in the chamber 26 is discharged to the solution management device 53 through the first tube 31, and the solution for forming the inner plating layer is discharged from the solution management device 53 to the third tube. The pressure is supplied to the chamber 26 via 33.

  The surface treatment mechanism 20 receives the supply of the solution for forming the inner plating layer in the chamber 26. The surface treatment mechanism 20 supplies an electric current between the inner wall 3 in contact with the first electrode 21 and the second electrode 22 in a state where the solution for forming the inner plating layer is filled in the chamber 26 to form the inner plating layer. A substance constituting the inner plating layer 43 contained in the solution is electrochemically deposited on the inner wall 3 facing the chamber 26, so-called electrodeposition is performed. Thus, the inner plating layer 43 for improving the adhesion of the outer plating layer 44 described later is formed in the vicinity of the corrosion 40 in the inner wall 3 so as to cover the corrosion 40.

  In the present embodiment, as the material forming the inner plating layer 43, various metal materials having relatively good adhesion of the outer plating layer 44 are used.

(Form an outer plating layer)
After the inner plating layer 43 is formed, the outer plating layer 44 is formed on the inner plating layer 43 as shown in FIGS. 5 and 7C. In the present embodiment, the solution for forming the inner plating layer (waste liquid) in the chamber 26 is discharged to the solution management device 53 through the first tube 31, and the solution for forming the outer plating layer is removed from the solution management device 53. The chamber 26 is supplied via the tube 34.

  The surface treatment mechanism 20 receives the supply of the solution for forming the outer plating layer in the chamber 26. The surface treatment mechanism 20 flows an electric current between the second electrode 22 and the inner wall 3 in contact with the first electrode 21 in a state where the solution for forming the outer plating layer is filled in the chamber 26 to form the outer plating layer The material constituting the outer plating layer 44 contained in the solution is electrodeposited on the inner plating layer 43. Thereby, in addition to the inner plating layer 43, the outer plating layer 44 is formed on the inner wall 3 so as to cover the corrosion 40. In the present embodiment, the outer plating layer 44 is made of iron, nickel, chromium, or an alloy containing any of these as a main component.

  As described above, in the surface treatment system of the present embodiment, the movable body 11 is, as shown in FIG. 3, an adsorption mechanism 15 for adsorbing to a wall surface (inner wall 3) in the nuclear reactor and It has a moving mechanism 16 for moving, a surface information acquiring unit 17 capable of acquiring surface information of the wall surface, and a chamber 26 capable of covering corrosion of the wall surface, and supplies the solution to the chamber 26. The surface treatment mechanism 20 capable of performing various surface treatments in the vicinity of corrosion is included, and is configured to be movable along the inner wall 3. In addition, the surface treatment system is a surface information processing apparatus 51 capable of identifying a portion of the inner wall 3 where corrosion has occurred based on the surface information acquired by the surface information acquisition unit 17, and a solution for forming a plating layer. And a solution management device 53 that can be supplied to the system.

  The surface treatment method of the present embodiment is a method for preventing the growth of corrosion generated on the wall surface by using the movable body 11, the surface information processing device 51 and the solution management device 53 described above, and the movable body is along the wall surface. The surface information processing apparatus 51 identifies a portion of the wall surface where corrosion has occurred based on the surface information obtained by the surface information acquisition unit 17 by moving the object, and the surface treatment mechanism 20 generates the corrosion. A portion is covered with a chamber 26, and the solution management device 53 supplies a solution for removing an oxide film to the chamber 26, thereby removing the oxide film in the vicinity of the corrosion, and the oxide film 41 is removed. And a step of forming the plating layers 43 and 44 so as to cover the corrosion 40 by the solution management device 53 supplying the plating layer forming solution to the chamber 26. It was. Thereby, the corrosion 40 can be shielded from the external environment, for example, the coolant in the reactor pressure vessel 1, and the growth of the corrosion due to the oxygen contained in the coolant can be prevented.

Second Embodiment
The surface treatment system and the surface treatment method of the second embodiment will be described with reference to FIGS. 4, 5, 7 and 8. FIG. 8 is a top view showing the configuration of a movable body in the surface treatment system of the present embodiment. The surface treatment system of this embodiment is different from the first embodiment described above only in the configuration of the movable body. The same reference numerals as in the first embodiment denote the same parts as those in the first embodiment, and a description thereof will be omitted.

  The movable body 11C of the present embodiment has a plurality of magnets 15e disposed on the bottom surface of the movable body 11C so as to face the inner wall 3 as an adsorption mechanism 15C for adsorbing the inner wall 3. The adsorption mechanism 15C generates a magnetic force (attractive force) that attracts each other between the magnet 15e and the inner wall 3. Thus, the suction mechanism 15C can suction at the desired position of the inner wall 3 and position the mobile body 11C at the desired position. Further, the adsorption mechanism 15C can release the adsorption on the inner wall 3 by eliminating the magnetic force (attractive force) acting between the magnet 15e and the inner wall 3.

  For example, an electromagnet can be used as the magnet 15e. By controlling the energization of the electromagnet, it is possible to control the adsorption on the inner wall 3 of the moving body 11C and the release thereof. Moreover, a permanent magnet can also be used for the magnet 15e. It is also possible to control the actuator that drives the permanent magnet and control the distance between the permanent magnet and the inner wall 3 to realize adsorption and release of the moving body 11C.

  In addition, the movable body 11C of the present embodiment has a grinding mechanism 60 capable of grinding the oxide film 41 on the inner wall 3 separately from the surface treatment mechanism 20 described above. The grinding mechanism 60 has a substantially columnar grinding material 61, and a mechanism (hereinafter referred to as a pressing mechanism) 63 for rotationally driving the grinding material 61 and pressing the grinding material 61 against the inner wall 3. The pressing mechanism 63 includes a motor (not shown) for rotationally driving the abrasive 61.

  In the surface treatment method of the present embodiment, after the portion of the inner wall 3 where the corrosion 40 has occurred is identified, the oxide film 41 (see FIG. 7A) in the vicinity of the corrosion 40 is ground with the abrasive 61 Then, the oxide film 41 is mechanically removed. After removing the oxide film 41, as shown in FIG.5 and FIG.7 (b), (c), the corrosion 40 is covered with the chamber 26 of the surface treatment mechanism 20, and the inner plating layer 43 and the outer plating layer 44 are formed. .

  The surface treatment method of the present embodiment can remove the oxide film 41 in a short time as compared to the case of removing the oxide film chemically using the oxide film removal solution. Further, the solution management device 53 shown in FIG. 4 does not need to manage the oxide film removing solution, and it is necessary to provide the second tube 32 (see FIG. 5) for supplying the oxide film removing solution to the surface treatment mechanism 20. There is no

Other Embodiments
In each of the above-described embodiments, the plating layer covering the corrosion 40 has a two-layer structure of the inner plating layer 43 and the outer plating layer 44, but the plating layer according to the present invention is limited to this embodiment It is not a thing. The plating layer according to the present invention only needs to shield the corrosion 40 from the external environment, and may be a single-layered plating layer (one-layer structure) so as to cover the corrosion 40. In addition, an intermediate plating layer may be formed between the inner plating layer 43 and the outer plating layer 44 (three-layer structure).

  In each of the above-described embodiments, a method of electrochemically depositing (electrodeposition) a metal, so-called electro (electrolytic) plating, is used to form the plating layers 43 and 44 covering the corrosion 40. However, the plating method used in the present invention is not limited to this. For example, without using the first electrode 21 and the second electrode 22 in the chamber 26, it is also possible to use a method of chemically reducing and depositing metal, so-called electroless plating.

  Moreover, in each embodiment mentioned above, based on the surface information acquired by the surface information acquisition part 17 of a mobile, the surface information processing apparatus 51 which can specify the part which corrosion generate | occur | produced among the said wall surfaces, and a mobile According to the present invention, the solution management device 53 for supplying a solution for forming the plating layers 43 and 44 to the surface treatment mechanism 20 of the present invention is provided on the operation floor 5 separated from the movable body. The surface information processing apparatus and the solution management apparatus are not limited to this aspect. At least one of the surface information processing apparatus and the solution management apparatus may be provided on the movable body.

  In each embodiment described above, the wall surface in the reactor to which the surface treatment method is applied is the inner wall 3 of the reactor pressure vessel 1, but the “wall surface in the reactor” according to the present invention It is not limited to the inner wall 3. The surface treatment method of the present invention can be applied to the corrosion that has occurred on various wall surfaces in a nuclear reactor, as long as the movable body of the surface treatment system can be arranged.

  While certain embodiments of the present invention have been described, these embodiments have been presented by way of example only, and are not intended to limit the scope of the invention. These novel embodiments can be implemented in other various forms, and various omissions, substitutions, and modifications can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and the gist of the invention, and are included in the invention described in the claims and the equivalent scope thereof.

1 reactor pressure vessel, 2 pump deck, 3 inner wall (wall in reactor), 4 core shroud, 5 operation floor, 11, 11C moving body, 15 adsorption mechanism, 15C adsorption mechanism, 15a propeller, 15e magnet, 16 movement Mechanism, 16a drive wheel, 17 surface information acquisition unit, 17a image sensor, 18 cable, 20 surface treatment mechanism, 21 first electrode (electrode), 22 second electrode (electrode), 26 chamber, 27 opening edge, 30 tube Bundle, 31 first tube, 32 second tube, 33 third tube, 34 fourth tube, 40 corrosion, 41 oxide film, 43 inner plating layer (plating layer), 44 outer plating layer (plating layer), 51 surface information Processing unit (image processing unit), 53 solution management unit, 55 controller, 57 unit control room, 60 Cutting mechanism, 61 abrasive, 63 pressing mechanism

Claims (6)

An adsorption mechanism that adsorbs to a wall surface in the coolant of the reactor in a nuclear reactor, a moving mechanism for moving along the wall surface, a surface information acquisition unit capable of acquiring surface information of the wall surface, A chamber capable of covering a portion of the wall, and a surface treatment mechanism capable of receiving a solution supplied to the chamber to perform surface treatment on a portion of the wall covered by the chamber , A movable body movable along the wall surface,
A solution management device capable of discharging the cooling fluid from the inside of the chamber and capable of supplying a plating layer forming solution to the chamber;
Based on the surface information acquired by the surface information acquisition unit, and the surface information processing apparatus capable of specifying the portion corrosion occurs among the wall surfaces,
Equipped with
The surface treatment mechanism is configured to cover a portion specified by the surface information processing apparatus with the chamber and receive a supply of the plating layer forming solution from the solution management apparatus to form a plating layer covering the corrosion. ,
The surface treatment system according to any one of the preceding claims, wherein the adsorption mechanism includes a propeller that is rotated to suction the surrounding cooling fluid . The solution management apparatus is configured to be able to supply an oxide film removal solution to the chamber,
The surface treatment according to claim 1, wherein the surface treatment mechanism receives the supply of a solution for removing an oxide film to the chamber to remove the oxide film from a part of the wall surface covered by the chamber. system. The system for surface treatment according to claim 1, wherein the movable body further has a grinding mechanism capable of grinding the oxide film on the wall surface with an abrasive. The surface treatment mechanism is
A substantially annular first electrode disposed in contact with the wall surface when an opening edge defining the chamber is in contact with the wall surface;
A substantially annular second electrode disposed at a distance from the wall surface so as not to contact the wall surface when the opening edge is in contact with the wall surface;
The surface treatment system according to any one of claims 1 to 3, comprising: The solution management apparatus according to any one of claims 1 to 4, wherein the solution for forming the inner plating layer and the solution for forming the outer plating layer can be respectively supplied to the chamber. The surface treatment system as described in a paragraph. An adsorption mechanism for adsorbing the coolant around the coolant by rotation on a wall in the coolant of the reactor in a nuclear reactor, a moving mechanism for moving along the wall, and a moving mechanism of the wall It has a surface information acquisition unit capable of acquiring surface information, and a chamber capable of covering a part of the wall, and is supplied with a solution to the chamber to cover the wall covered by the chamber. What is claimed is: 1. A surface treatment method using a movable body movable along the wall surface, including a surface treatment mechanism capable of performing surface treatment,
A step of, based on the surface information obtained by the surface information acquisition unit, a surface processing device to specify partial corrosion occurs among the walls by moving the movable body along the wall surface,
Covering the identified portion of the surface treatment mechanism with the surrounding cooling liquid , in the chamber of the surface treatment mechanism;
With discharging the cooling liquid in the chamber, comprising the steps of solution management device supplies an oxide film removing solution in the chamber, to remove the oxide coating covered walls in the chamber,
After the oxide film is removed, the solution management apparatus supplies a solution for forming a plating layer to the chamber to form a plating layer so as to cover the corrosion;
A surface treatment method characterized in that the method is carried out in the coolant of the nuclear reactor .

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