JP7285116B2 - Decontamination device and method - Google Patents

Description

TECHNICAL FIELD The present invention relates to a decontamination apparatus and method for removing radioactive substances adhering to the surfaces of members.

As a device for removing radioactive substances adhering to the surface of an object to be decontaminated, there is a decontamination device that irradiates a laser onto the surface of the object to be decontaminated. As such a decontamination device, there is one described in Patent Document 1 below. The technology described in Patent Document 1 irradiates a laser with a controlled energy density to the surface of a structural material or equipment that comes into contact with a radioactive fluid, and peels off and removes radioactive substances adhering to the surface of the structural material or equipment. It is something to do.

JP-A-11-183693

By the way, when decontaminating an object to be decontaminated, for example, while moving a plate as the object to be decontaminated by a conveyor, the surface of the moving plate is irradiated with a laser to remove the radioactive substances adhering to the surface. will be removed. In this case, it is necessary to cut the plate material to be decontaminated into a predetermined size and position it at a predetermined position on the conveyor. Therefore, when decontaminating a large number of plates, preparation work such as cutting the plates and positioning the plates on the conveyor takes time, and the workability of the decontamination work is poor. be.

An object of the present invention is to solve such problems, and to provide a decontamination apparatus and method for improving workability of decontamination work.

The decontamination apparatus of the present invention for solving the above-mentioned problems comprises a movable carriage that can freely move a surface to be decontaminated, and a laser beam mounted on the movable carriage toward the front side of the surface to be decontaminated in the moving direction. and an assist gas supply device for supplying an assist gas to a region irradiated with the laser on the surface to be decontaminated.

Therefore, while the mobile cart is moving on the decontamination target surface, the laser irradiation device can irradiate the laser toward the decontamination target surface, and the assist gas supply device can supply the assist gas. There is no need to cut it to a predetermined size or position it at a predetermined position, so that the workability of the decontamination work can be improved.

The decontamination apparatus of the present invention is characterized in that a distance adjustment device is provided for adjusting the distance between the surface to be decontaminated and the laser irradiation device.

Therefore, since the distance between the decontamination target surface and the laser irradiation device is adjusted by the distance adjustment device according to the shape change of the decontamination target surface, the focal position of the laser emitted from the laser irradiation device is always at the appropriate position. can be maintained.

The decontamination apparatus of the present invention is characterized in that an angle adjustment device is provided for adjusting the angle of the laser irradiation device with respect to the surface to be decontaminated.

Therefore, according to the shape change of the decontamination target surface, the angle of the laser irradiation device with respect to the decontamination target surface is adjusted by the angle adjustment device, so the angle of the laser irradiated from the laser irradiation device is always maintained at an appropriate angle. be able to.

The decontamination apparatus of the present invention is characterized in that a scattering prevention member is provided to prevent scattering of secondary products generated by irradiating the laser onto the surface to be decontaminated.

Therefore, when the surface to be decontaminated is irradiated with a laser and the secondary products including the melted matter are removed by the assist gas, the scattering prevention member prevents the secondary products from scattering. secondary products can be prevented from diffusing.

The decontamination apparatus of the present invention is characterized in that a recovery device is provided for recovering secondary products generated by irradiating the surface to be decontaminated with the laser.

Therefore, when the surface to be decontaminated is irradiated with a laser and the secondary products including the melted matter are removed by the assist gas, the secondary products are recovered by the recovery device, and the secondary products are discharged to the surroundings. Diffusion of objects can be prevented.

In the decontamination apparatus of the present invention, the recovery device includes a recovery member provided on the front side of the laser irradiation area on the surface to be decontaminated, and an exhaust device having one end connected to the recovery member and the other end connected to the recovery member. a secondary product processing line connected to the secondary product processing line, an air blower provided in the secondary product processing line to apply a suction force to the recovery member, and a recovery member provided in the secondary product processing line. and a filter provided in the secondary product processing line for removing fine particles from the gas from which the solids have been separated. and

Therefore, the generated secondary product is recovered by the recovery member, the solid matter is separated from the secondary product by the separation device, and fine particles are removed from the gas from which the solid matter is separated by the filter. Subsequent products can be safely processed.

The decontamination apparatus of the present invention is characterized in that the movable carriage is provided with an operation lever for operating the laser irradiation device.

Therefore, the operator can switch between operation and stop of the laser irradiation device by operating the operation lever, thereby improving operability.

In the decontamination apparatus of the present invention, the movable trolley is provided with a traveling body that moves on the surface to be decontaminated and a driving device that drives the traveling body, and moves according to an operation signal from the operating device to the driving device. It is characterized by being able to operate and stop.

Therefore, by operating the operation device and transmitting an operation signal to the driving device, the operator can remotely move and stop the mobile trolley, thereby improving operability.

The decontamination apparatus of the present invention is characterized in that the mobile carriage is supported by the tip of a manipulator in a self-propelled robot.

Therefore, by operating the self-propelled robot, it is possible to move to a predetermined decontamination location, and by operating the manipulator, it is possible to decontaminate a predetermined area, improving the workability of decontamination work. can be improved.

The decontamination apparatus of the present invention is characterized in that the movable cart is provided with a display section for displaying the state of decontamination work.

Therefore, the current decontamination work state is displayed on the display unit, and the decontamination work state by the decontamination apparatus can be easily recognized from the outside.

The decontamination apparatus of the present invention is provided with a traveling speed detector that detects the traveling speed of the mobile cart, and a control device that adjusts the laser output of the laser irradiation device based on the detection result of the traveling speed detector. It is characterized by

Therefore, since the control device adjusts the laser output of the laser irradiation device based on the traveling speed of the mobile cart, the depth of melting of the surface to be decontaminated by laser irradiation can be set to the optimum depth, and the appropriate decontamination work can be carried out.

In the decontamination apparatus of the present invention, the mobile trolley includes a detector for detecting the decontamination work state of the surface to be decontaminated, and a work determination device that determines whether the decontamination work state is good or bad based on the detection result of the detector. and the control device stops the laser irradiation by the laser irradiation device based on the judgment result of the work judgment device.

Therefore, the work determiner determines whether the decontamination work state of the surface to be decontaminated is good or bad, and when the decontamination work state is not appropriate, the control device stops the laser irradiation by the laser irradiation device. , it is possible to recognize that the decontamination work state is not appropriate by stopping the laser irradiation, and it is possible to improve the decontamination accuracy.

In the decontamination apparatus of the present invention, the mobile cart includes a verifier for verifying the decontamination result of the surface to be decontaminated, and a judgment of whether the decontamination result is good or bad based on the verification result of the verifier. A decontamination determiner and a decontamination display section for displaying the determination result of the decontamination determiner are provided.

Therefore, the decontamination judging device judges whether the decontamination of the surface to be decontaminated is good or bad, and the decontamination display unit displays the judgment result. is not appropriate, and the decontamination accuracy can be improved.

In the decontamination apparatus of the present invention, the assist gas supply device is configured by attaching a gas nozzle to the tip of the assist gas injection head. a constricted portion having a constricted flow end extending in the width direction so as to form a curved surface that is convex toward the side; and an enlarged portion having a curved open end formed by enlarging the constricted end.

Therefore, the flow velocity of the gas increases in the contraction section, and when the flow velocity of the gas supplied to the contraction section is sufficiently high, the gas passing through the contraction section reaches the speed of sound. The flow velocity of the gas, which has reached the speed of sound, increases further through the enlarged portion and becomes supersonic. In other words, the contracting portion and the expanding portion form a Laval nozzle. According to this configuration, since both the contraction end of the contraction portion and the opening end of the expansion portion are curved, the jetted assist gas has a curved surface when viewed from the decontamination direction of the decontamination pattern surface. flow in a direction perpendicular to As a result, even when the surface to be decontaminated is curved, the assist gas can be made to collide with the curved surface while being uniformly dispersed. As a result, the molten material generated by laser irradiation can be sufficiently removed over the entire curved surface.

Further, the decontamination method of the present invention includes a step of moving while irradiating a laser to a surface to be decontaminated to decontaminate a plurality of first regions adjacent in the width direction with a predetermined width and a predetermined length; a step of moving while irradiating the laser onto the surface to be decontaminated at a position between the adjacent first regions to decontaminate the second regions adjacent in the width direction with a predetermined width and a predetermined length; , is characterized by having

Therefore, it is not necessary to cut the decontamination object into a predetermined size or to position it at a predetermined position, so that workability of the decontamination work can be improved.

According to the decontamination apparatus and method of the present invention, workability of decontamination work can be improved.

FIG. 1 is a perspective view showing the decontamination device of the first embodiment. FIG. 2 is a schematic diagram showing the decontamination apparatus. FIG. 3 is a schematic diagram showing the decontamination system. FIG. 4 is an explanatory diagram for explaining the decontamination method using the decontamination device. FIG. 5 is a perspective view showing the decontamination device of the second embodiment. FIG. 6 is a schematic diagram showing the recovery device of the decontamination device. FIG. 7 is a schematic diagram showing the decontamination apparatus of the third embodiment. FIG. 8 is a perspective view showing a gas nozzle in the decontamination apparatus of the fourth embodiment. FIG. 9 is a cross-sectional view in the width direction of the gas nozzle. FIG. 10 is a plan view showing a gas nozzle. FIG. 11 is a plan view and cross-sectional view showing a modification of the gas nozzle.

BEST MODE FOR CARRYING OUT THE INVENTION Below, embodiments of the present invention will be described in detail based on the drawings. In addition, this invention is not limited by this embodiment. In addition, components in the following embodiments include components that can be easily replaced by those skilled in the art, or components that are substantially the same. Furthermore, the components described below can be combined as appropriate, and when there are multiple embodiments, each embodiment can be combined.

[First embodiment]
FIG. 1 is a perspective view showing the decontamination apparatus of the first embodiment, and FIG. 2 is a schematic configuration diagram showing the decontamination apparatus.

In the first embodiment, as shown in FIGS. 1 and 2, the decontamination apparatus 10 irradiates the surface of the decontamination target 001, that is, the decontamination target surface 002, with a laser L, and This is done using a laser gouging method that melts and removes. Here, the objects 001 to be decontaminated include, for example, various structural members of a nuclear reactor generated by decommissioning work in a nuclear power plant, various members generated in a nuclear fuel reprocessing facility, and the like.

A decontamination apparatus 10 of the first embodiment includes a mobile carriage 11 , a laser irradiation device 12 , and an assist gas supply device 13 .

The mobile carriage 11 has a carriage body 21 , four wheels (running bodies) 22 and a handle 23 . Two wheels (running bodies) 22 are mounted on each side of the carriage body 21 . Note that crawlers may be provided instead of the wheels 22 . The handle 23 is provided on the rear side in the moving direction M of the mobile carriage 11 . The handle 23 is composed of a pair of mounting portions 24 erected on both sides of the mobile carriage 11 and a handle portion 25 provided so as to connect the upper end portions of the pair of mounting portions 24 . The mobile cart 11 is moved by pushing the handle 23 by the operator, and moves the decontamination target surface 002 of the decontamination target object 001 in the moving direction M. However, a driving device 26 for driving the wheels (running body) 22 may be provided, and the movable carriage 11 may be moved by remotely controlling the driving device 26 by an operating device (not shown). In this case, the operating device and the driving device 26 can be connected by wire or wirelessly.

The laser irradiation device 12 is mounted on the carriage body 21 and irradiates the laser L toward the decontamination target surface 002 of the decontamination target object 001 on the front side in the moving direction M. As shown in FIG. The laser irradiation device 12 has a laser irradiation head 31 and is supported by the carriage body 21 via a distance adjustment device 32 and an angle adjustment device 33 . The distance adjustment device 32 adjusts the distance between the decontamination target surface 002 and the laser irradiation head 31 . The distance adjusting device 32 has a mounting base 34 fixed to the carriage body 21, a lifting base 35 that can be moved up and down relative to the mounting base 34, and a lifting handle 36 that moves the lifting base 35 up and down relative to the mounting base 34. . The angle adjusting device 33 adjusts the angle of the laser irradiation head 31 with respect to the surface 002 to be decontaminated. The angle adjustment device 33 has a tilting table 37 fixed to the lifting table 35 and a tilting handle 38 for tilting the tilting table 37 with respect to the lifting table 35 . The laser irradiation head 31 is supported on the tilt table 37 .

The laser irradiation head 31 irradiates the laser L toward the decontamination target surface 002 on the front side in the moving direction M. As shown in FIG. That is, since the trolley body 21 is provided in parallel with the decontamination target surface 002, the laser irradiation head 31 is placed on the tilt table so as to form a predetermined inclination angle (for example, 45 degrees) with respect to the trolley body 21. 37. The laser irradiation head 31 can irradiate the laser L with a predetermined width, and is set so that the focal position is on the surface 002 to be decontaminated. That is, the laser irradiation head 31 adjusts the focal position of the laser L by the distance adjustment device 32 and adjusts the irradiation angle by the angle adjustment device 33 .

The assist gas supply device 13 is mounted on the carriage body 21 and supplies the assist gas G to the irradiation area of the laser L on the decontamination target surface 002 . The assist gas supply device 13 has an assist gas injection nozzle 41 and is supported by the laser irradiation head 31 via a pair of brackets 42 . The assist gas injection nozzle 41 is supported by the laser irradiation head 31 so as to form a predetermined inclination angle (for example, 90 degrees) with respect to the carriage body 21 . The assist gas injection nozzle 41 can inject the assist gas G with a predetermined width, and injects the assist gas G from the focus position of the laser L to the decontamination target surface 002 on the moving direction M side by a predetermined length. That is, the assist gas injection nozzle 41 adjusts the ejection position of the assist gas G by the distance adjusting device 32 together with the laser irradiation head 31 , and adjusts the ejection angle by the angle adjusting device 33 .

In addition, the mobile carriage 11 is provided with a scattering prevention member 51 that prevents the scattering of the secondary product generated by the irradiation of the laser L onto the surface 002 to be decontaminated. When the laser L irradiates the decontamination target surface 002, the surface of the decontamination target 001 melts together with the radioactive materials adhering to the decontamination target surface 002, and secondary products containing melted matter and gas are produced. generated. The scattering prevention member 51 is arranged on the forward side in the movement direction M from the irradiation position of the laser L and the injection position of the assist gas G on the surface 002 to be decontaminated. The anti-scatter member 51 is supported on the front end of the carriage body 21 by a pair of brackets 52 .

The movable carriage 11 is provided with an operation lever 53 for operating the laser irradiation device 12 . Two operation levers 53 are provided on the handle portion 25 of the handle 23 . The laser irradiation device 12 and the assist gas supply device 13 are connected to a control device 55 via a junction box 54 . Similarly, the operating lever 53 is also connected to the control device 55 via the relay box 54 . Therefore, when the operator operates the operation lever 53 , the laser irradiation device 12 can be operated and the laser L can be emitted from the laser irradiation head 31 . Although the assist gas supply device 13 continuously injects the assist gas G from the assist gas injection nozzle 41, an operation lever is provided, and the operation lever is operated to operate the assist gas supply device 13. may

The mobile cart 11 is provided with a display section 56 for displaying the decontamination work state. The display unit 56 is connected to the control device 55 via the junction box 54 . The display unit 56 , for example, lights blue when the decontamination apparatus 10 is stopped, yellow during standby, and red during decontamination work.

The movable carriage 11 includes a speed detector 57 as a traveling speed detector for detecting the traveling speed of the movable carriage 11, and a controller 55 for adjusting the laser output of the laser irradiation device 12 based on the detection result of the speed detector 57. is provided. If the laser output of the laser irradiation device 12 is too high relative to the decontamination speed by the laser irradiation device 12, that is, the moving speed of the mobile carriage 11, the melt depth of the surface 002 to be decontaminated by the irradiation of the laser L will be deeper. As a result, secondary products produced by the melting of the decontamination object 001 increase, and removal of the secondary products by the assist gas G becomes difficult. Therefore, the laser output of the laser irradiation device 12 is set to an optimum value with respect to the moving speed of the movable carriage 11, and the assist gas G is used to properly remove secondary products, thereby enabling proper decontamination work.

The mobile cart 11 is provided with a speed detector 57 and a floating detector 58 as detectors for detecting the decontamination work state of the surface 002 to be decontaminated. The control device 55 as a work determiner determines whether the decontamination work state is good or bad based on the detection results of the speed detector 57 and the floating detector 58 . That is, when the decontamination work for the decontamination target surface 002 is performed, if the movement speed of the mobile carriage 11 is too fast, the decontamination processing on the decontamination target surface 002 will be insufficient. Therefore, the control device 55 determines whether or not the speed of the mobile carriage 11 detected by the speed detector 57 is within a predetermined speed range. Further, as described above, the laser irradiation head 31 preferably sets the focal position of the laser L to the surface 002 to be decontaminated. Therefore, the control device 55 determines whether or not the height of the mobile carriage 11 detected by the floating detector 58 relative to the decontamination target surface 002 is within a predetermined height range. The control device 55 stops the irradiation of the laser L by the laser irradiation device 12 based on the quality determination result. At this time, the control device 55 may cause the display section 56 to blink red.

The mobile carriage 11 is provided with a dosimeter 59 as a verifier for verifying the decontamination result on the surface 002 to be decontaminated. This dosimeter 59 measures the radiation dose of radioactive substances on the decontamination target surface 002 after the surface layer of the decontamination target 001 has been removed by irradiation with the laser L from the laser irradiation head 31 . The control device 55 as a decontamination judging device judges whether the decontamination result is good or bad based on the measurement result of the dosimeter 59. Determine whether or not the radiation dose is below the specified radiation dose. The control device 55 displays the determination result of decontamination on the display section (decontamination display section) 56 . In this case, for example, the display unit 56 is blinked.

FIG. 3 is a schematic diagram showing the decontamination system.

As shown in FIG. 3 , in the laser irradiation device 12 , a laser irradiation head 31 is connected to a laser oscillator 62 via a transmission cable 61 . Laser oscillator 62 is connected to controller 55 . The laser oscillator 62 irradiates the laser L with a predetermined output by controlling the irradiation of the laser L by the control device 55 . The transmission cable 61 guides the laser L emitted from the laser oscillator 62 toward the laser irradiation head 31 . The laser irradiation head 31 irradiates the laser L guided by the transmission cable 61 toward the decontamination target surface 002 .

In the assist gas supply device 13 , the assist gas injection nozzle 41 is connected to the assist gas supply section 64 through the assist gas supply line 63 . The assist gas supply unit 64 is connected to the control device 55 and supplies, for example, inert gases (N ₂ , Ar, He, CO ₂ ) and combustion supporting gases (O ₂ ). The type of assist gas may be appropriately set according to the object 001 to be decontaminated, the decontamination atmosphere, and the like. The assist gas supply unit 64 supplies the inert gas at a predetermined supply amount by controlling the supply of the inert gas by the control device 55 . The assist gas supply line 63 circulates the inert gas supplied from the assist gas supply section 64 toward the assist gas injection nozzle 41 . The assist gas injection nozzle 41 injects the assist gas G toward the laser L irradiation position.

Therefore, for example, the decontamination device 10 is placed in the reactor containment vessel inside the reactor building (not shown), and the decontamination device 10 is remotely operated from outside the reactor building or the reactor containment vessel by an operating device. Manipulate. That is, the worker remotely moves the decontamination device 10 while performing the decontamination work for the decontamination target 101 .

Here, a decontamination method using the decontamination device 10 of the first embodiment will be described. FIG. 4 is an explanatory diagram for explaining the decontamination method using the decontamination device.

As shown in FIGS. 1 and 4, the decontamination method of the first embodiment moves while irradiating a laser L onto a surface 002 to be decontaminated to move a plurality of laser beams adjacent to each other in the width direction with a predetermined width and a predetermined length. A step of decontaminating one area A1, and moving while irradiating the laser L to the surface 002 to be decontaminated at a position between a plurality of first areas A1 adjacent in the width direction to have a predetermined width and a predetermined length. and decontaminating the second regions A2 adjacent in the width direction.

First, while moving the mobile carriage 11 in the movement direction M at a predetermined speed, the laser irradiation head 31 irradiates the laser L and the assist gas injection nozzle 41 injects the assist gas G toward the decontamination target surface 002. do. Then, a first region A1a having a predetermined width W1 and a predetermined length L is decontaminated on the surface 002 to be decontaminated. Subsequently, at a position adjacent to the first region A1a in the width direction, the laser irradiation head 31 irradiates the laser L toward the decontamination target surface 002 while moving the mobile carriage 11 in the movement direction M at a predetermined speed. At the same time, the assist gas injection nozzle 41 injects the assist gas G. Then, a first area A1b having a predetermined width W1 and a predetermined length L is decontaminated on the surface 002 to be decontaminated. Similarly, the first area A1c adjacent to the first area A1b in the width direction is decontaminated, and the first area A1d adjacent to the first area A1c in the width direction is decontaminated.

Next, at a position where the first area A1a and the first area A1b are adjacent in the width direction, while moving the mobile carriage 11 in the moving direction M at a predetermined speed, the laser irradiation head 31 is directed toward the surface 002 to be decontaminated. emits the laser L, and the assist gas injection nozzle 41 injects the assist gas G. As shown in FIG. Then, a second area A2a having a predetermined width W2 and a predetermined length L is decontaminated on the surface 002 to be decontaminated. Subsequently, at a position adjacent to the second area A2a in the width direction, the laser irradiation head 31 irradiates the laser L toward the decontamination target surface 002 while moving the mobile carriage 11 in the movement direction M at a predetermined speed. At the same time, the assist gas injection nozzle 41 injects the assist gas G. Then, a second area A2b having a predetermined width W2 and a predetermined length L is decontaminated on the surface 002 to be decontaminated. Similarly, the second area A2c adjacent to the second area A2b in the width direction is decontaminated.

Therefore, even if a region that could not be decontaminated occurs between the first region A1a, the first region A1b, the first region A1c, and the first region A1d, it is shifted by a predetermined length in the width direction to be the second region A2a. Since the second area A2b and the second area A2c are decontaminated, the decontamination target surface 002 is decontaminated without gaps. In addition, according to the adhesion amount of the radioactive substance on the decontamination target surface 002, a plurality of third regions are shifted by a predetermined length in the width direction with respect to the second region A2a, the second region A2b, and the second region A2c. May be decontaminated.

As described above, in the decontamination apparatus of the first embodiment, the movable carriage 11 that can freely move the surface 002 to be decontaminated, and the surface to be decontaminated 002 mounted on the movable carriage 11 on the front side in the moving direction M A laser irradiation device 12 that irradiates a laser L toward the decontamination target surface 002 and an assist gas supply device 13 that supplies an assist gas G to the irradiation area of the laser L on the decontamination target surface 002 .

Therefore, while the mobile cart 11 moves on the decontamination target surface 002, the laser irradiation device 12 can irradiate the laser L toward the decontamination target surface 002, and the assist gas supply device 13 can supply the assist gas G. This eliminates the need to cut the object 001 to be decontaminated into a predetermined size or position it at a predetermined position, thereby improving the workability of the decontamination work.

The decontamination apparatus of the first embodiment is provided with a distance adjustment device 32 that adjusts the distance between the decontamination target surface 002 and the laser irradiation device 12 . Therefore, according to the shape change of the decontamination target surface 002, the distance between the decontamination target surface 002 and the laser irradiation device 12 is adjusted by the distance adjustment device 32, so that the focus of the laser L irradiated from the laser irradiation device 12 The position can always be maintained in the correct position.

The decontamination apparatus of the first embodiment is provided with an angle adjustment device 33 that adjusts the angle of the laser irradiation device 12 with respect to the surface 002 to be decontaminated. Therefore, since the angle of the laser irradiation device 12 with respect to the decontamination target surface 002 is adjusted by the angle adjustment device 33 according to the shape change of the decontamination target surface 002, the laser irradiation device 12 irradiates the decontamination target surface 002 Therefore, the angle of the laser L can be maintained at a proper angle at all times.

In the decontamination apparatus of the first embodiment, a scattering prevention member 51 is provided to prevent scattering of secondary products generated by irradiation of the laser L on the surface 002 to be decontaminated. Therefore, when the surface 002 to be decontaminated is irradiated with the laser L and the secondary products containing the melt are removed by the assist gas G, the secondary products collide with the scattering prevention member 51, Scattering of the secondary product is prevented, and diffusion of the secondary product to the surroundings can be prevented.

In the decontamination apparatus of the first embodiment, the movable carriage 11 is provided with an operation lever 53 for operating the laser irradiation device 12 . Therefore, the operator can switch between operation and stop of the laser irradiation device 12 by operating the operation lever 53, thereby improving operability.

In the decontamination apparatus of the first embodiment, the mobile trolley 11 is provided with wheels 22 for moving the decontamination target surface 002 and driving devices 26 for driving the wheels 22, and an operation signal from the operating device to the driving device 26 Move and stop operations are possible. Therefore, by operating the operation device and transmitting an operation signal to the driving device 26, the operator can remotely move and stop the mobile carriage 11, thereby improving operability.

In the decontamination apparatus of the first embodiment, the mobile cart 11 is provided with a display section for displaying the state of decontamination work. Therefore, the current decontamination work state is displayed on the display unit 56, and the decontamination work state by the decontamination apparatus can be easily recognized from the outside.

In the decontamination apparatus of the first embodiment, the speed detector 57 as a traveling speed detector that detects the traveling speed of the mobile carriage 11 and the laser output of the laser irradiation device 12 are adjusted based on the detection result of the speed detector 57. A control device 55 is provided for controlling. Therefore, the depth of melting of the surface 002 to be decontaminated by the irradiation of the laser L can be set to an optimum depth, and by appropriately removing the generated secondary product with the assist gas G, appropriate decontamination can be achieved. work can be done.

In the decontamination apparatus of the first embodiment, a speed detector 57 and a floating detector 58 are provided as detectors for detecting the state of decontamination work on the surface 002 to be decontaminated. Based on the detection result of , the quality of the decontamination work state is determined, and the laser L irradiation by the laser irradiation device 12 is stopped. Therefore, the control device 55 determines whether the decontamination work state of the surface to be decontaminated is good or bad, and stops the irradiation of the laser L by the laser irradiation device 12 when the decontamination work state is not appropriate. By stopping the irradiation of the laser L, it can be recognized that the decontamination work state is not appropriate, and the decontamination accuracy can be improved by adjusting the laser irradiation device 12 or redoing the decontamination work. can be done.

In the decontamination apparatus of the first embodiment, a dosimeter 59 is provided as a verification device for verifying the decontamination results on the decontamination target surface 002, and the control device 55 decontaminates based on the measurement results of the dosimeter 59. The quality of the result is determined, and the determination result is displayed on the display unit 56 . Therefore, the control device 55 determines whether the decontamination of the surface 002 to be decontaminated is good or bad, and the display unit 56 displays the determination result. It can be recognized that it is not, and the decontamination accuracy can be improved by redoing the decontamination work.

Further, in the decontamination method of the first embodiment, while irradiating the laser L onto the surface 002 to be decontaminated, it moves to remove a plurality of first regions A1 adjacent in the width direction with a predetermined width and a predetermined length. and a step of moving while irradiating the laser L to the decontamination target surface 002 at a position between a plurality of first regions A adjacent in the width direction so that the surface 002 to be decontaminated is adjacent to the surface 002 in the width direction with a predetermined width and a predetermined length. and decontaminating the second area A2. Therefore, it is not necessary to cut the decontamination object into a predetermined size or to position it at a predetermined position, so that workability of the decontamination work can be improved.

[Second embodiment]
FIG. 5 is a perspective view showing the decontamination device of the second embodiment, and FIG. 6 is a schematic configuration diagram showing a collection device of the decontamination device. Members having the same functions as those of the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the second embodiment, as shown in FIGS. 5 and 6, the decontamination apparatus 10A irradiates the surface of the decontamination target 001, that is, the decontamination target surface 002, with a laser L, and the layer to which the radioactive substance adheres. is melted and removed. The decontamination apparatus 10 includes a mobile carriage 11 , a laser irradiation device 12 and an assist gas supply device 13 .

The mobile carriage 11 is provided with a recovery device 71 that recovers the secondary product generated by irradiating the laser L onto the surface 002 to be decontaminated. When the laser L irradiates the decontamination target surface 002, the surface of the decontamination target 001 melts together with the radioactive materials adhering to the decontamination target surface 002, and secondary products containing melted matter and gas are produced. generated. The recovery device 71 is arranged on the front side in the movement direction M from the irradiation position of the laser L and the injection position of the assist gas G on the surface 002 to be decontaminated.

The recovery device 71 has a recovery member 72 , a secondary product treatment line 73 , a blower 74 , a cyclone 75 as a separation device, and a filter 76 . The recovery member 72 is provided on the front side of the irradiation area of the laser L on the surface 002 to be decontaminated, and is supported by a pair of brackets 77 on the front end of the carriage body 21 . The secondary product treatment line 73 has one end connected to the recovery member 72 and the other end connected to an exhaust device 78 . A blower 74 is provided between the filter 76 and the exhaust device 78 in the secondary product treatment line 73 . The air blower 74 is operated to generate a flow from the collection member 72 toward the exhaust device 78 and apply a suction force to the collection member 72 . Cyclone 75 is provided downstream of recovery member 72 in secondary product treatment line 73 . The cyclone 75 separates solids (melted and solidified) from the secondary product collected by the collecting member 72 . Filter 76 is provided downstream from cyclone 75 in secondary product treatment line 73 . Filter 76 is a HEPA filter that removes fine particles from the gas from which solids have been separated. In addition, on-off valves 79 are provided upstream and downstream of the filter 76 in the secondary product treatment line 73 .

Therefore, while moving the carriage 11 in the movement direction M, the laser irradiation head 31 irradiates the laser L and the assist gas injection nozzle 41 injects the assist gas G toward the decontamination target surface 002 . Then, the surface 002 to be decontaminated is decontaminated and a secondary product is generated. In the recovery device 71 , when the blower 74 is operated, a flow is generated from the recovery member 72 toward the exhaust device 78 , and a suction force acts on the recovery member 72 . Then, secondary products generated on the decontamination target surface 002 are recovered by the recovery member 72 and sent to the cyclone 75 through the secondary product treatment line 73 . A cyclone 75 separates solids from the secondary product and a filter 76 removes fine particles from the solids-separated gas. The clean gas from which solid matter and fine particles have been removed is discharged to the outside by an exhaust device 78 .

As described above, the decontamination apparatus of the second embodiment is provided with the recovery device 71 that recovers the secondary product generated by irradiating the laser L on the surface 002 to be decontaminated.

Therefore, when the decontamination target surface 002 is irradiated with the laser L and the secondary products including the melted matter are removed by the assist gas G, the secondary products are recovered by the recovery device 71, and the surrounding Diffusion of secondary products to

In the decontamination apparatus of the second embodiment, as the recovery device 71, a recovery member 72 is provided on the front side of the irradiation area of the laser L on the decontamination target surface 002, and one end is connected to the recovery member 72 and the other end is connected to the recovery member 72. is connected to an exhaust device 78, a blower 74 provided in the secondary product processing line 73 to apply a suction force to the recovery member 72, and a fan 74 provided in the secondary product processing line 73. A cyclone 75 that separates solid matter from the secondary product collected by the recovery member 72, and a filter 76 that is provided in the secondary product processing line 73 and removes fine particles from the gas from which the solid matter has been separated. set up. Therefore, the generated secondary product is recovered by the recovery member 72, the solid matter is separated from the secondary product by the cyclone 75, and fine particles are removed from the gas from which the solid matter is separated by the filter 76. , secondary products can be safely disposed of.

[Third embodiment]
FIG. 7 is a schematic diagram showing the decontamination apparatus of the third embodiment. Members having the same functions as those of the above-described first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the third embodiment, as shown in FIG. 7, the mobile carriage 11 of the decontamination apparatus 10 is supported by the tip of the manipulator 81 of the self-propelled robot 80. As shown in FIG. The robot 80 is configured by providing a crawler 83 at the bottom of a main body 82 and a manipulator 81 at the top. The manipulator 81 has a multi-joint arm, and the mobile carriage 11 of the decontamination apparatus 10 is connected to the tip.

Therefore, while operating the movable cart 11 and the manipulator 81 to move the movable cart 11 along the decontamination target surface 002 along the vertical direction, the laser irradiation head 31 irradiates the laser L toward the decontamination target surface 002. At the same time, the assist gas injection nozzle 41 injects the assist gas G. Then, the radioactive substances adhering to the surface 002 to be decontaminated are removed and decontaminated.

As described above, in the decontamination apparatus of the third embodiment, the mobile carriage 11 is supported by the tip of the manipulator 81 in the self-propelled robot 80 . Therefore, by operating the self-propelled robot 80, it is possible to move to a predetermined decontamination location, and by operating the manipulator 81, it is possible to decontaminate a predetermined area, and the decontamination work can be performed. can improve sexuality.

[Fourth embodiment]
8 is a perspective view showing a gas nozzle in the decontamination apparatus of the fourth embodiment, FIG. 9 is a cross-sectional view of the gas nozzle in the width direction, FIG. 10 is a plan view showing the gas nozzle, and FIG. 11 is a modification of the gas nozzle. 1A and 1B are a plan view and a cross-sectional view. FIG. The basic configuration of this embodiment is the same as that of the above-described first embodiment, and will be explained using FIG. , and detailed description is omitted.

In the fourth embodiment, as shown in FIGS. 1 and 8, in the decontamination apparatus 10, the assist gas supply device 13 has an assist gas injection nozzle 100. As shown in FIG.

The assist gas injection nozzle 100 has a nozzle base 101 and a nozzle cap 102 . The nozzle base 101 has a rectangular box shape with a hollow interior. The nozzle base 101 is an assist in which a channel through which the assist gas G flows is provided. A nozzle cap 102 is detachably attached to the downstream end of the nozzle base 101 in the flow direction Df of the assist gas G. As shown in FIG. The nozzle cap 102 is provided to increase the flow velocity of the assist gas G and diffuse the assist gas G along the shape of the decontamination target surface 004 of the decontamination target 003 (see FIG. 10 for both). The flow direction Df of the assist gas G is defined as the direction in which the assist gas G flows through the nozzle base 101. The direction Df may be referenced.

As shown in FIGS. 8 to 10, the nozzle cap 102 includes a connection portion 111 connected to the nozzle base portion 101, a reduced portion 112 integrally provided downstream of the connection portion 111, and a further downstream portion of the reduced portion 112. and an enlarged portion 113 integrally provided on the side thereof. The connecting portion 111 has a size and a structure slightly larger than the downstream end portion of the nozzle base portion 101, and is connected so as to cover the nozzle base portion 101 from the downstream side. When viewed from the flow direction Df of the assist gas G, the connecting portion 111 has a rectangular cross section. In the following description, the longitudinal direction of the connecting portion 111 is referred to as the width direction Dw, and the direction perpendicular to the width direction Dw and the flow direction Df of the assist gas G (that is, the lateral direction of the connecting portion 111) is the thickness direction Dt. call. Inside the connecting portion 111, the dimensions in the thickness direction Dt and the width direction Dw are constant throughout the flow direction Df of the assist gas G. As shown in FIG.

The contracted portion 112 has a rectangular cross-section when viewed from the flow direction Df of the assist gas G, and the internal cross-sectional area (passage cross-sectional area) decreases from the upstream side to the downstream side. Specifically, inside the reduced portion 112, the dimensions in the width direction Dw and the thickness direction Dt gradually decrease toward the downstream side. In other words, the separation dimension between the wall surfaces W11 and W12 facing the width direction Dw on the inner surface of the reduced portion 112 gradually decreases toward the downstream side. Similarly, the separation dimension between the wall surfaces W21 and W22 facing the thickness direction Dt on the inner surface of the reduced portion 112 gradually decreases toward the downstream side. In addition, in the fourth embodiment, the flow passage cross-sectional area of the contracted portion 112 linearly decreases from the upstream side to the downstream side.

An upstream end (upstream end T1) of the reduced portion 112 spreads within a plane defined by the width direction Dw and the thickness direction Dt. On the other hand, the downstream end portion (contraction end T2) of the contraction portion 112 has a curved surface that protrudes from the upstream side toward the downstream side in the flow direction Df of the assist gas G. As shown in FIG. More specifically, the contracted flow end T2 has a cylindrical surface that protrudes toward the downstream side.

The expansion section 113 is connected to the contraction end T2 of the contraction section 112 . The enlarged portion 113 has a rectangular cross section when viewed from the flow direction Df of the assist gas G, and the flow passage cross-sectional area increases toward the downstream side. Specifically, in the enlarged portion 113, the dimensions in the width direction Dw and the thickness direction Dt gradually increase toward the downstream side. In other words, the separation dimension between the wall surfaces W31 and W32 facing the width direction Dw on the inner surface of the enlarged portion 113 gradually increases toward the downstream side. Similarly, the separation dimension between the wall surfaces W41 and W42 facing the thickness direction Dt on the inner surface of the enlarged portion 113 gradually increases toward the downstream side. In addition, in the fourth embodiment, the change rate (increase rate) of the flow passage cross-sectional area of the enlarged portion 113 decreases from the upstream side to the downstream side. That is, the rate of increase in the cross-sectional area of the flow path of the expanded portion 113 increases as it approaches the contracted flow end T2, and decreases as it moves further downstream.

The downstream end of the enlarged portion 113 is an open end T3 that opens toward the downstream side. The opening end T3 has a rectangular shape when viewed from the flow direction Df of the assist gas G, and has a curved surface shape by enlarging the contraction end T2. In other words, when viewed from the flow direction Df of the assist gas G, the opening end T3 has a shape similar to that of the contraction end T2. Further, the opening end T3 has an arc shape that is concentric with the arc formed by the contraction end T2 when viewed from the thickness direction Dt. That is, the dimension from the contraction end T2 to the opening end T3 is constant over the entire circumference of the arc. Moreover, the dimension of the opening end T3 in the width direction Dw is preferably 1/20 or more and 1/10 or less of the dimension in the thickness direction Dt. More desirably, the dimension of the opening end T3 in the width direction Dw is 1/15 or more and 1/12 or less of the dimension in the thickness direction Dt. Most desirably, the dimension of the opening end T3 in the width direction Dw is 1/13 of the dimension in the thickness direction Dt.

Therefore, as shown in FIG. 9, the assist gas G reaches the reduced portion 112 of the nozzle cap 102 through the nozzle base portion 101 . The flow velocity of the assist gas G is set so that it already approaches the speed of sound when it passes through the nozzle base 101 . Here, in the narrowed portion 112, the cross-sectional area of the flow path decreases from the upstream side to the downstream side. As a result, the assist gas G having a flow velocity close to the sonic velocity at the upstream end T1 of the constricted portion 112 is further accelerated and reaches the sonic velocity at the contraction end T2. The sonic assist gas G that has passed through the contraction end T2 flows toward the opening end T3 of the enlarged portion 113 . The enlarged portion 113 has a channel cross-sectional area that gradually increases from the upstream side to the downstream side. As a result, the assist gas G, which has reached sonic speed, is further accelerated to become a supersonic jet. That is, the supersonic assist gas G is jetted from the opening end T3 of the contracted portion 112, thereby blowing off and removing the melted material.

By the way, when the assist gas G does not collide with the curved surface perpendicularly, the assist gas G disperses asymmetrically in the circumferential direction (perpendicular to the decontamination direction) after the collision, and the melt on the decontamination target surface 004 Since the gas is not jetted uniformly, the molten material remains at locations where the fluid force is weak. Therefore, in order to efficiently remove the melted matter, it is desirable that the assist gas G collide perpendicularly with the surface 004 to be decontaminated when viewed from the traveling direction Dp. Therefore, for example, when decontaminating the inner peripheral surface of the decontamination object 103 having a circular cross section, the flow direction Df of the assist gas G is dispersed in accordance with the curved surface shape of the inner peripheral surface, and the assist gas G is uniformly distributed. should collide. This prevents the assist gas G from dispersing asymmetrically in the circumferential direction after collision, makes it possible to uniformly apply a fluid force to the molten matter on the decontamination target surface 004, and improves the remaining molten matter. can.

Therefore, in the assist gas injection nozzle 100, the opening end T3 and the contraction end T2 are curved as described above. In particular, the opening end T3 has a curved shape that expands the contraction end T2. In other words, when viewed from the flow direction Df of the assist gas G, the opening end T3 has a shape similar to that of the contraction end T2. Further, the opening end T3 has an arc shape that is concentric with the arc formed by the contraction end T2 when viewed from the thickness direction Dt. As a result, at the contraction end T2, the flow of the assist gas G is rectified along the curved shape of the contraction end T2, and the flow velocity of the assist gas G increases. Furthermore, at the opening end T3, the high-speed assist gas G flows in a direction perpendicular to the plane formed by the opening end T3. In other words, the assist gas G collides with the curved decontamination target surface 04 of the decontamination target 103 at an angle close to perpendicular when viewed from the traveling direction Dp. This allows efficient removal of the melt.

As described above, in the decontamination apparatus 10 of the fourth embodiment, both the constricted flow end T2 of the contracting portion 112 and the opening end T3 of the expanding portion 113 are curved. The flow direction Df of the assist gas G is perpendicular to the curved surface when viewed from the traveling direction Dp (that is, the direction in which the object 103 to be decontaminated extends). As a result, even when the surface 004 to be decontaminated is curved, the assist gas G can be uniformly dispersed and collided with the curved surface. As a result, the molten material generated by the irradiation of the laser L can be accurately and sufficiently removed over the entire curved surface.

Furthermore, in the above configuration, the opening end T3 has a shape similar to that of the contraction end T2 when viewed from the flow direction Df of the assist gas G. As shown in FIG. According to this configuration, the flow velocity of the assist gas G can be increased while maintaining the flow velocity distribution from the contraction end T2 to the open end T3. In other words, it is possible to reduce the possibility that the assist gas G is biased or forms a vortex in the region from the contraction end T2 to the opening end T3.

In addition, in the above configuration, the channel cross-sectional area of the contracted portion 112 becomes smaller toward the downstream side, and the channel cross-sectional area of the expanded portion 113 becomes larger toward the downstream side. As a result, the flow velocity of the assist gas G increases in the reduced portion 112 . When the flow velocity of the assist gas G supplied to the contracting portion 112 is sufficiently high, the assist gas G passing through the contracting portion 112 reaches the speed of sound. The flow velocity of the assist gas G, which has reached the sonic velocity, further increases through the enlarged portion 113 and becomes supersonic velocity. That is, the contracting portion 112 and the expanding portion 113 form a Laval nozzle. This allows the melt to be removed more efficiently.

In addition, according to the above configuration, the size of the reduced portion 112 in the thickness direction Dt decreases toward the downstream side. As a result, the flow velocity of the assist gas G passing through the contraction portion 112 increases toward the downstream side. As a result, the high-speed assist gas G can efficiently remove the melt.

Furthermore, according to the above configuration, the size of the reduced portion 112 in the width direction Dw becomes smaller toward the downstream side. As a result, the flow velocity of the assist gas G passing through the contraction portion 112 increases toward the downstream side. As a result, the high-speed assist gas G can efficiently remove oily substances.

Further, according to the above configuration, the dimension of the enlarged portion 113 in the thickness direction Dt increases toward the downstream side. As a result, when the flow velocity of the assist gas G that has passed through the contracting portion 112 exceeds the sonic speed, the flow velocity further increases through the expanding portion 113 and becomes supersonic. As a result, the high-speed assist gas G can remove the melt more efficiently.

Furthermore, according to the above configuration, the dimension in the width direction Dw of the enlarged portion 113 increases toward the downstream side. As a result, when the flow velocity of the assist gas G that has passed through the contracting portion 112 exceeds the sonic speed, the flow velocity further increases through the expanding portion 113 and becomes supersonic. As a result, the high-speed assist gas G can remove the melt more efficiently.

In addition, according to the above configuration, both the contraction end T2 and the opening end T3 form an arcuate shape that protrudes toward the downstream side, and when viewed from the thickness direction Dt, the contraction end T2 and the opening The arcs of end T3 are concentric. That is, the dimension from the contraction end T2 to the opening end T3 is constant over the entire circumference of the arc. As a result, at the contraction end T2, the flow of the assist gas G is rectified along the curved shape of the contraction end T2, and the flow velocity of the assist gas G increases. Furthermore, at the opening end T3, the high-speed assist gas G flows in a direction perpendicular to the plane formed by the opening end T3. That is, the assist gas G collides with the curved decontamination target surface 004 of the decontamination target object 103 at an angle close to vertical. This allows efficient removal of the melt. On the other hand, when the assist gas G collides with the decontamination target surface 004 at an acute angle, the melted material flows along the curved surface and gathers at a specific location, so there is a possibility that accurate decontamination cannot be performed. be. However, according to the above configuration, such possibility can be reduced.

In addition, in the above configuration, the dimension of the opening end T3 in the width direction Dw is 1/20 or more and 1/10 or less of the dimension in the thickness direction Dt. According to this configuration, the above-described Laval shape can be realized while keeping the dimension in the thickness direction Dt sufficiently small with respect to the dimension in the width direction Dw of the opening end T3. As a result, the assist gas injection nozzle 100 can be made smaller in size, so that the assist gas injection nozzle 100 can be easily brought closer to the object 103 to be decontaminated even if the decontamination location is narrow. As a result, more accurate decontamination work can be performed.

Note that the assist gas injection nozzle 100 of the present invention is not limited to the configuration described above. For example, in the fourth embodiment, a configuration has been described in which the cross-sectional area of the flow passage of the reduced portion 112 gradually decreases in the width direction Dw and the thickness direction Dt toward the downstream side. However, the configuration of the reduction unit 112 is not limited to the above. As another example, as shown in FIG. 11, the dimension in the thickness direction Dt of the reduced portion 112 is constant over the entire extension region, and only the dimension in the width direction Dw is reduced toward the downstream side. It is also possible to set It is also possible to set the size of the reduced portion 112 in the width direction Dw to be constant over the entire extension area, and set only the size in the thickness direction Dt to decrease toward the downstream side. Even in this case, the channel cross-sectional area of the enlarged portion 113 is set so as to gradually increase toward the downstream side. With such a configuration, it is possible to obtain the same effects as those of the above-described embodiment.

Furthermore, in the fourth embodiment, a piping having a circular cross section as the object 103 to be decontaminated has been described as an example. However, the object to be decontaminated is not limited to piping, and any member having a curved surface can be applied as the surface 004 to be decontaminated.

In addition, in the fourth embodiment, the flow channel cross-sectional area of the reduced portion 112 linearly decreases toward the downstream side, and the flow channel cross-sectional area of the enlarged portion 113 increases linearly toward the downstream side. explained. However, the configurations of the reduction section 112 and the expansion section 113 are not limited to the above. As another example, it is possible to employ a configuration in which the cross-sectional area of each flow path changes curvilinearly from the upstream side to the downstream side. With this configuration, the assist gas G can flow more smoothly along the inner surface of the assist gas injection nozzle 100 . As a result, the pressure loss of the assist gas G is reduced, and the flow velocity can be further increased.

10, 10A decontamination device 11 movable cart 12 laser irradiation device 13 assist gas supply device 21 cart body 22 wheel (running body)
23 handle 26 drive device 31 laser irradiation head 32 distance adjustment device 33 angle adjustment device 41, 100 assist gas injection nozzle 51 scattering prevention member 53 operation lever 54 relay box 55 control device (work determiner, decontamination determiner)
56 display unit (decontamination display unit)
57 speed detector (detector)
58 floating detector (detector)
59 Dosimeter (Verifier)
71 recovery device 72 recovery member 73 secondary product treatment line 74 blower 75 cyclone (separation device)
76 Filter 78 Exhaust device 79 On-off valve 80 Robot 81 Manipulator 101 Nozzle base 102 Nozzle cap 111 Connection part 112 Reduction part 113 Expansion part 001, 003 Object to be decontaminated 002, 004 Surface to be decontaminated A1 First area A2 Second area M Movement direction G Assist gas L Laser Df Gas flow direction Dp Advancing direction Dt Thickness direction T1 Upstream end T2 Constriction end T3 Opening end

Claims (15)

A mobile cart that can move freely on the surface to be decontaminated,
a laser irradiation device that is mounted on the mobile cart and irradiates a laser toward the surface to be decontaminated on the front side in the moving direction;
an assist gas supply device that supplies an assist gas to the laser irradiation area of the decontamination target surface;
with
A traveling speed detector that detects the traveling speed of the mobile cart, and a control device that adjusts the laser output of the laser irradiation device based on the detection result of the traveling speed detector are provided.
A decontamination device characterized by: The mobile cart is provided with a detector for detecting the decontamination work state of the surface to be decontaminated, and a work determiner for determining whether the decontamination work state is good or bad based on the detection result of the detector. 2. The decontamination apparatus according to claim 1, wherein the apparatus stops the laser irradiation by the laser irradiation device based on the determination result of the work determination device. The assist gas supply device is configured by attaching a gas nozzle to the tip of an assist gas injection head, and the gas nozzle has a flow path cross-sectional area that decreases toward the downstream side and a curved surface that becomes convex toward the downstream side. a constricted portion having a constricted flow end extending in the width direction so as to form a shape; and a channel cross-sectional area that is connected to the constricted flow end of the constricted portion and that extends toward the downstream side while enlarging the constricted flow end. 3. The decontamination apparatus according to claim 1, further comprising an enlarged portion having an open end with a curved surface. A mobile cart that can move freely on the surface to be decontaminated,
a laser irradiation device that is mounted on the mobile cart and irradiates a laser toward the surface to be decontaminated on the front side in the moving direction;
an assist gas supply device that supplies an assist gas to the laser irradiation area of the decontamination target surface;
with
The assist gas supply device is configured by attaching a gas nozzle to the tip of an assist gas injection head, and the gas nozzle has a flow path cross-sectional area that decreases toward the downstream side and a curved surface that becomes convex toward the downstream side. a constricted portion having a constricted flow end extending in the width direction so as to form a shape; and a channel cross-sectional area that is connected to the constricted flow end of the constricted portion and that extends toward the downstream side while enlarging the constricted flow end. an enlarged portion having an open end with a tapered curved surface;
A decontamination device characterized by: 5. The decontamination apparatus according to any one of claims 1 to 4, further comprising a distance adjustment device that adjusts the distance between the surface to be decontaminated and the laser irradiation device. 6. The decontamination apparatus according to any one of claims 1 to 5, further comprising an angle adjustment device that adjusts an angle of the laser irradiation device with respect to the surface to be decontaminated. 7. The anti-scattering member according to any one of claims 1 to 6, characterized in that a scattering prevention member is provided to prevent scattering of secondary products generated by irradiating the laser onto the surface to be decontaminated. decontamination equipment. 8. The decontamination apparatus according to any one of claims 1 to 7, further comprising a collection device that collects secondary products generated by irradiating the laser onto the surface to be decontaminated. . The recovery device includes a recovery member provided on the front side of the laser irradiation area on the surface to be decontaminated, and a secondary product having one end connected to the recovery member and the other end connected to an exhaust device. a processing line, a blower provided in the secondary product processing line to apply a suction force to the recovery member, and the secondary product provided in the secondary product processing line and recovered by the recovery member. and a filter for removing fine particles from the gas from which the solids are separated, provided in the secondary product processing line. decontamination equipment. 10. The decontamination apparatus according to any one of claims 1 to 9 , wherein the movable carriage is provided with an operation lever for operating the laser irradiation device. The movable trolley is provided with a running body that moves on the surface to be decontaminated and a driving device that drives the running body, and can be moved and stopped by an operation signal sent from an operating device to the driving device. The decontamination apparatus according to any one of claims 1 to 10, characterized in that: 11. The decontamination apparatus according to any one of claims 1 to 10 , wherein the movable cart is supported by a tip of a manipulator of a self-propelled robot. 13. The decontamination apparatus according to any one of claims 1 to 12 , wherein the movable carriage is provided with a display section for displaying the decontamination work state. The mobile trolley includes a verifier that verifies the decontamination result of the surface to be decontaminated, a decontamination determiner that determines the quality of the decontamination result based on the verification result of the verifier, and the decontamination 14. The decontamination apparatus according to any one of claims 1 to 13 , further comprising a decontamination display section for displaying the determination result of the contamination determining device. In the decontamination method using the decontamination device according to any one of claims 1 to 14,
A step of decontaminating a plurality of first regions adjacent in the width direction with a predetermined width and a predetermined length by moving while irradiating the laser to the surface to be decontaminated;
While irradiating the surface to be decontaminated with a laser at a position between the plurality of first regions adjacent in the width direction, the second regions adjacent in the width direction are decontaminated with a predetermined width and a predetermined length. and
A decontamination method characterized by having

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