JP6320908B2 - Underwater repair system and underwater repair method using the same - Google Patents

Description

  The present invention relates to an underwater repair system for repairing an inner wall of a fuel storage pool installed in, for example, a nuclear power plant or a spent fuel storage facility, and an underwater repair method using the same.

  For example, in fuel storage pools installed at nuclear power plants and spent fuel storage facilities, water is stored to block radiation from stored radioactive materials and radioactive waste and to cool them. Yes. Therefore, when a defect or the like occurs in a metal plate applied as a lining on the inner surface of the fuel storage pool and repair is necessary, it is necessary to perform the repair without draining water.

  As a technique related to the repair of the inner wall of the fuel storage pool as described above, for example, Patent Document 1 (Japanese Patent Laid-Open No. 2012-194118) uses a first partition body having a repair target, a flat plate, two side plates, and a bottom plate. An underwater adhesion repair method is disclosed in which a joining member is fixed from the side plate side of the first partition body, and an adhesive is filled in a space surrounded by the repair target, the first partition body, and the joining member.

JP 2012-194118 A

  However, in the above prior art, since the adhesive is injected and cured in water, the adhesion between the repair target and the adhesive and the curing of the adhesive are hindered by the dilution of the adhesive in water and the flow of water. For this reason, there is a concern that the adhesive of the repaired part easily peels from the repair target.

  The present invention has been made in view of the above, and an object of the present invention is to provide an underwater repair system and an underwater repair method using the same, which can give high durability to a repaired portion to be repaired.

  In order to achieve the above object, the present invention is a hollow-shaped repair member used for repair of a repair target, and is arranged so that the repair member having an opening toward the repair target is in close contact with the repair target portion of the repair target A position fixing device that supports the air, and an air filling device that fills air into a first space defined by the repair member and the repair target fixed to the repair target location by the position fixing device, It is assumed that the first space filled with air is filled with a sealing agent, and a sealing agent filling device that seals the repair target portion to be repaired with the repair member and the sealing agent.

  High durability can be given to the repaired part to be repaired.

It is a figure which shows roughly the whole structure of the underwater repair system which concerns on one Embodiment with a fuel storage pool. It is an enlarged view of the A section in FIG. 1, and is a figure which shows the mode of the movement process in an underwater repair method. It is an enlarged view of the A section in FIG. 1, and is a figure which shows the mode of the fixing process in the underwater repair method. It is an enlarged view of the A section in FIG. 1, and is a figure which shows the mode of the pressing process and the drainage / drying process in an underwater repair method. It is an enlarged view of the A section in FIG. 1, and is a figure which shows the mode of the filling process in an underwater repair method. It is an enlarged view of the A section in Drawing 1, and is a figure showing the situation of the separation process in an underwater repair method. It is an enlarged view of the A section in FIG. 1, and is a figure which shows the mode of the movement process in an underwater repair method.

  An embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a diagram schematically showing an overall configuration of an underwater repair system according to the present embodiment together with a fuel storage pool. FIG. 2 is an enlarged view of a portion A in FIG. 1 and shows a state in which the position fixing device is moved to the vicinity of a repair target location (described later).

  1 and 2, the fuel storage pool 90 is formed by a concrete wall 91 and is configured by lining a lining plate (a metal plate such as stainless steel) 92. The fuel storage pool 90 stores water (fuel storage pool water) 93 for shielding radiation from stored radioactive materials and radioactive waste (not shown) and cooling them.

  The underwater repair system 100 generates a position fixing device 1 for fixing a chamber 12 (described later) as a repair member used for repairing the lining plate 92 to be repaired at a repair position, and compressed air to be sent to the position fixing device 1. An air source 2 such as a compressor, an air control device 3 for adjusting compressed air sent from the air source 2 to the position fixing device, and a negative pressure unit 4 as a vacuum source for sucking water and air from the position fixing device 1 A crane device 5 such as a jib crane that transports the position fixing device 1 via a wire 5a, an AC power source 6 that supplies power to each part of the underwater repair system 100, an input device, a display device, a storage device, etc. (not shown) And a control device 7 that controls the overall operation of the underwater repair system 100.

  The position fixing device 1 includes a frame member 10 constituting the foundation structure, an ejector 11 fixed to the frame member 10 for fixing the relative position of the position fixing device 1 with respect to the lining plate 92, and repair of the lining plate 92. A hollow repair member used in the above-described process, which has a chamber 12 having an opening 12a facing the lining plate 92, and is fixed to the frame member 10 and detachable from the chamber 12, and the chamber 12 is lined An air cylinder 13 for pressing the plate 92 against a repair target position, a sealant container 14 containing a sealant 14a as a repair member used for repair, and a sealant 14a in the sealant container 14 in the chamber 12 And an air cylinder 15 for pushing out.

  The ejector 11 has a suction pad portion 11a at a position in contact with the repair target. The ejector 11 is connected to the negative pressure unit 4 through the water line 4a, and the inside of the ejector 11 is brought into a negative pressure state or a vacuum state with the suction pad portion 11a being in contact with the lining plate 92 to be repaired. By doing so, it adsorbs to the lining plate 92 and fixes the relative position of the position fixing device 1 with respect to the lining plate 92.

  The air cylinder 13 has its expansion and contraction operation controlled by compressed air sent from an air control device 3 connected via an air line (not shown). Further, the joining force of the connecting portion between the air cylinder 13 and the chamber 12 is sufficiently fixed when moving in the air or in water, and the sealing agent 14a filled in a state of being pressed against the lining plate 92 is cured. When the air cylinder 13 is contracted in this state, it is configured to be easily detached. Note that a disconnection mechanism may be provided at a connection portion between the air cylinder 13 and the chamber 12 and the disconnection may be performed by a control signal from the control device 7.

  A contact member 12b formed of a member having air permeability, water permeability and elasticity, such as a sponge, is provided at a position where the outer edge of the opening 12a of the chamber 12 is in contact with the lining plate 92 to ensure the close contact. It has been. The chamber 12 is connected to the air control device 3 via the air line 3 a, and compressed air is supplied into the chamber 12 from the air control device 3. The chamber 12 is connected to the sealing agent container 14 via a filling line 14 b, and the sealing agent 14 a is supplied from the sealing agent container 14 into the chamber 12.

The air cylinder 15 is controlled to extend and contract by compressed air sent from an air control device 3 connected via an air line (not shown).

  Here, the air source 2 and the air control device 3 are filled with air to fill the inside of the first space defined by the repair member fixed to the repair target location and the repair target by the position fixing device 1. The sealing agent container 14 and the air cylinder 15 are configured to fill the inside of the first space filled with air, and seal the repair target portion to be repaired with the repair member and the sealing agent. The agent filling device is configured.

  Next, an underwater repair method using the underwater repair system according to the present embodiment will be described with reference to the drawings.

  3 to 7 are enlarged views of a part A in FIG. 1 as in FIG. 2, and are diagrams illustrating states of each process in the underwater repair method.

(1) Moving process (see Fig. 2)
First, the position fixing device 1 is poured into the water 93 stored in the fuel storage pool 90 by the crane device 5 so that the opening 12a of the chamber 12 faces the defective portion 92a that is a repair target portion of the lining plate 92. Deploy. Defect portion 92a is, for example, a minute crack or the like occurs in the lining plate 9 2, causing such leakage of water stored in the fuel storage pool 90.

(2) Fixing process (see Fig. 3)
Next, the position fixing device 1 is moved to the lining plate 92 side by the crane device 5 and is arranged at a position where the suction pad portion 11a of the ejector 11 is in close contact with the lining plate 92. In this state, the internal water is sucked by the negative pressure unit 4 through the water line 4a, and the inside is made into a negative pressure state or a vacuum state. As a result, the ejector 11 is attracted to the lining plate 92 and the relative position of the position fixing device 1 with respect to the lining plate 92 is fixed.

(3) Pressing process (see Fig. 4)
Next, compressed air is supplied from the air control device 3 to the air cylinder 13 via an air line (not shown) to be extended, and the chamber 12 is pressed against the repair target portion (defect portion 92a) of the lining plate 92 to be brought into close contact therewith. At this time, the defective portion 92a is arranged to be surrounded by the opening 12a. Here, the contact state between the chamber 12 and the lining plate 92 is confirmed from the collapsed state of the sponge (contact member 12 b ).

(4) Drainage / drying process (see Fig. 4)
Next, compressed air is supplied from the air control device 3 to the space 12c (liquid phase space, first space) defined by the chamber 12 and the lining plate 92 via the air line 3a, and the remaining water in the space 12c is removed. By exhausting from the opening 12a and a vent hole (not shown) (which is a drain hole provided on the bottom surface of the chamber 12, for example, M4 size is provided at eight locations), the space 12c is formed as a gas phase space. The inside of 12c is dried. Here, the drying state inside the space 12c by the air supplied via the air line 3a is confirmed based on a time calculated in advance through experiments or the like.

(5) Filling process (see FIG. 6)
Then, if the inner space 12c is sufficiently dry (i.e., if the time required for drying has elapsed), to fill the sealant 14a from the sealing container 14 into space 12c via the fill line 14 b. Here, the curing state of the sealing agent 14a inside the space 12c is confirmed based on a time calculated in advance through experiments or the like.

(6) Separation process (see Fig. 7)
Next, when the sealing agent 14a in the space 12c is sufficiently cured (that is, when the time necessary for curing has elapsed), compressed air is supplied from the air control device 3 to the air cylinder 13 via an air line (not shown). The air cylinder 13 is separated from the chamber 12. Thereby, the defective part 92a (repair object location) of the lining board 92 (repair object) is sealed with the chamber 12 (repair member) and the sealing agent 14a.

(7) Moving process (see Fig. 7)
Next, water is introduced into the suction pad portion 11a of the ejector 11 through the water line 4a so as to be in a pressurized state, the suction state by the suction pad portion 11a is canceled, and the fixing to the lining plate 92 is released. After confirming that the position fixing device 1 is separated from the lining plate 92, the position fixing device 1 is pulled up and collected from the water 93 stored in the fuel storage pool 90 by the crane device 5.

  The effect of this embodiment configured as described above will be described.

  As in the prior art, in water, a first partition having a repair target, a flat plate, two side plates, and a bottom plate is used, and the contact member is fixed from the side plate side of the first partition, and the repair target and the first partition When the adhesive is filled into the space surrounded by the contact member and cured, the adhesion between the repair target and the adhesive and the curing of the adhesive are hindered by the dilution of the adhesive in water and the flow of water. For this reason, there is a concern that the adhesive of the repaired part easily peels from the repair target.

  On the other hand, in this embodiment, the repair member is a hollow repair member used for repair of the repair target, and the repair member having an opening toward the repair target is disposed so as to be in close contact with the repair target portion of the repair target. The inside of the first space defined by the repair member and the repair object is filled with air, the inside of the first space filled with air is filled with the sealant, and the repair member and the sealant are used. Since it comprised so that the repair object location of repair object might be sealed, high durability can be given to the repair part of repair object.

  That is, in the present embodiment, air is filled in the state where the defective portion 92a of the lining plate 92, which is a repair target portion, is covered with the chamber 12, and the defective portion 92a and the vicinity thereof are made into a gas phase. The adhesiveness and curability to the lining plate 92 can be improved, the peeling of the sealing agent 14a from the lining plate 92 does not occur, and highly durable repair can be performed.

  Moreover, since the size of the chamber 12 is sufficient if the opening 12a surrounds the defect 92a, it is possible to select the repair target position and the repair target shape with a high degree of freedom.

  In addition, pressing the chamber 12 onto the object to be repaired, filling the space 12c with air, and filling with the sealant 14a are the main processes of repair, and a relatively simple operation is performed by more workers. Can do.

  In the present embodiment, the case where the defective portion 92a in the lining plate 92 on the side wall of the fuel storage pool 90 is repaired is described as an example. However, the present invention is not limited to this, and the lining plate 92 at the bottom of the fuel storage pool 90 is used. It is also possible to adjust the direction of the position fixing device 1 so that the opening 12a of the chamber 12 and the suction pad portion 11a of the ejector 11 face in the direction of, and to perform the underwater repair method according to the present embodiment. Further, by configuring the shape of the chamber 12 and the direction of the ejector 11 so as to conform to the corner of the fuel storage pool 90, the underwater repair method according to the present embodiment can also be applied to the corner.

  The present invention is not limited to the above-described embodiments, and includes various modifications. 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.

DESCRIPTION OF SYMBOLS 1 Position fixing apparatus 2 Air source 3 Air control apparatus 3a Air line 4 Negative pressure unit 4a Water line 5 Crane apparatus 6 AC power supply 7 Control apparatus 10 Frame member 11 Ejector 11a Adsorption pad part 12 Chamber 12a Opening part 12b Contact member 12c Space 13 Air cylinder 14 Sealing agent container 14a Sealing agent 15 Air cylinder 90 Fuel storage pool 91 Concrete wall 92 Lining plate 93 Water 100 Underwater repair system

Claims (4)

A position fixing device that is a hollow-shaped repair member used for repair of a repair target, and arranges and supports a repair member having an opening directed to the repair target so as to be in close contact with the repair target portion of the repair target;
An air filling device that fills the inside of the first space defined by the repair member and the repair target fixed to the repair target portion of the repair target by the position fixing device;
A sealant filling device is provided that fills the inside of the first space filled with air with a sealant and seals the repair target portion to be repaired with the repair member and the sealant. Underwater repair system. The underwater repair system according to claim 1,
The position fixing device includes:
An ejector for fixing the relative position of the position fixing device with respect to the repair target by making the inside of the suction pad portion brought into contact with the repair target into a vacuum state;
An underwater repair system, comprising: an air cylinder that is detachably attached to the repair member and presses the repair member against the repair target. A hollow-shaped repair member used for repair of a repair target, and a procedure for arranging and supporting a repair member having an opening directed to the repair target so as to be in close contact with the repair target location,
A procedure for filling the interior of the first space defined by the repair member fixed at the repair target location and the repair target;
A submerged repair comprising: filling the inside of the first space filled with air with a sealing agent, and sealing the repair target portion to be repaired with the repair member and the sealing agent. Method. In the underwater repair method according to claim 3,
Curing the sealing agent filled in the first space;
An underwater repair method comprising: a procedure for releasing support of the repair member.

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