KR101646598B1 - Specimen sampling equipment for nozzle of reactor vessel head - Google Patents

Abstract

The present invention relates to a sampling apparatus for a nozzle of a reactor head and a method thereof, and more specifically, to a sampling apparatus for a nozzle of a reactor head, capable of analyzing a cause of damage in detail by sampling a remaining specimen which is as it was first damaged to prevent reoccurrence of damage to the reactor and a method thereof. It is necessary to precisely analyze a cause of the damage to prevent reoccurrence of the damage due to stress corrosion cracking (SCC) of the INCONEL 600 in accordance with long-term operation of a reactor. The sampling apparatus for a nozzle of a reactor head according to an embodiment of the present invention comprises: a discharge electrode (10) to discharge an arch while having a predetermined distance with a damaged surface in order to sample a damaged part inside the reactor; and an electrode discharge-liquid supply nozzle (18) to supply a discharge liquid to the damaged surface. The apparatus according to an embodiment of the present invention has effects of enabling safe sampling of a specimen by preparing an automated apparatus capable of preserving a damaged part as it is.

Description

(EN) METHOD AND APPARATUS FOR COLLECTING SAMPLES OF NUCLEAR RESPONSE HEAD. {SPECIMEN SAMPLING EQUIPMENT FOR NOZZLE OF REACTOR VESSEL HEAD}

The present invention relates to a sampling device and a sampling method of a nuclear power generator equipped with a reactor, and more particularly, to a sampling device and a sampling method for preventing the recurrence of SCC (Stress Corrosion Cracking) damage of a reactor head nozzle part due to long- And methods.

      Nuclear power generation utilizes the fact that nuclear fission occurs by colliding a neutron with a uranium atom, generating enormous heat together with fission. As the nuclear fuel stored in the fuel rod breaks down, the fuel rod becomes heat conduction, circulating water around it to produce hot steam. This steam is the principle that drives the turbine and makes the generator run.

The construction of such a nuclear power generator includes a CRDM nozzle and an exhaust pipe for driving the reactor head and the control rod.

INCONEL 600 is generally used as a material for the nozzle and exhaust pipe, and it is manufactured by welding using the same INCONEL 600 as the base material.

However, INCONEL 600 has been damaged by SCC (Stress Corrosion Cracking) due to long-term operation.

In order to prevent recurrence of these injuries, it is necessary to analyze the exact cause of damage.

However, taking into account that the sampling site is the inside of the nuclear power plant where uranium is used as the raw material for the power generation, it is considered that the risk of contamination from various radioactive materials , It is an extremely dangerous task.

Therefore, there is a need for a sampling device capable of directly sampling on the site on behalf of the operator and sampling the damage site inside the nuclear power plant.

Further, there is a problem that it is difficult to preserve the original shape of the damaged portion. Therefore, an automated sampling device capable of preserving the original shape of the damaged part is needed.

U.S. Published Patent Application No. 2008-0175345

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a nuclear reactor head which is capable of collecting a specimen in which a damage- And a sample collecting apparatus and method for a nozzle unit.

In order to achieve the above object, a sample collecting apparatus according to an embodiment of the present invention for sampling a damaged part of a nuclear reactor, And an electrode discharge liquid supply nozzle for spraying and supplying a discharge liquid to the surface of the damaged portion.

The electrode for electric discharge machining may include a sample collecting device for performing discharge machining in a state in which the discharge liquid is supplied to the sample to be sampled by the discharge liquid supply nozzle. The present invention can be applied not only to the automatic sampling of damage to the nozzle head of the nuclear power plant, but also to the sampling of damaged parts occurring at a position where human access is difficult.

In addition, the apparatus further includes a discharge liquid receiver for recovering the discharge liquid, wherein the discharge liquid receiver is composed of an inner surface and an outer surface, and the outer surface has a tapered shape Device.

A plurality of cameras can be installed in the discharge liquid receiver.

The electrode discharge liquid supply nozzle may include a discharge liquid supply nozzle fixing part provided at one side of the support part and a support part extending upward from the discharge liquid supply nozzle fixing part, It is preferable to include a pair of nozzle tubes.

Wherein each of the nozzle tubes extends in such a manner that a distance therebetween is increased toward the electrode for electric discharge machining from the discharge liquid supply nozzle fixing portion in a state where the nozzle tube is inclined at a predetermined angle from the support portion, It is preferable that they are formed in such a shape that the distance between them is narrowed.

In this case, the final height of the end of the nozzle tube is preferably lower than the height of the electrode for electric discharge machining.

The discharge liquid supply nozzle fixing part may include a dial for performing a front and rear angle adjusting function of the pair of nozzle pipes so as to adjust a position where the discharge liquid is supplied according to the shape of the electrode.

It is preferable to control the discharge liquid supply nozzle so that the discharge liquid can be supplied to the point where the electric discharge machining occurs, in the case where the shape of the electrode includes the three-dimensional bending rather than the straight line.

And a power supply brush that includes an electrode driver for rotationally driving the electrode for electric discharge machining and supplies power even when the electrode is rotated.

There is a need for the electrode for electric discharge machining to have its own tilting and rotational driving in order to collect a sample of a nozzle head having a circular dome shape and to collect a sample in a space that is hard to work by manual operation of the person.

 At least one process monitoring camera for monitoring the sampling process, and at least one electrode monitoring camera for monitoring the position of the electrodes.

The sample collecting apparatus may include a driving unit for controlling the attitude of the supporting unit, the driving unit being located below the discharging solution receptacle.

Such a drive unit enables rapid and precise position control of the electrode for electric discharge machining.

The driving unit may include a tilting driving unit that tilts the supporting unit at a predetermined angle from the vertical axis of the apparatus.

The driving unit may include left and right driving units for moving the supporting unit in the left and right directions.

The driving unit may include a front-rear driving unit for moving the supporting unit in the front-rear direction.

The driving unit may include a rotation driving unit that rotationally drives the support unit with the axis parallel to the vertical axis of the apparatus as a rotation axis.

The driving unit includes a vertical driving unit for moving the supporting unit in the vertical direction, and a plurality of supporting bars can be arranged around the vertical driving unit.

Further, it is preferable that the electrode for electric discharge machining has a shape of a rectangular parallelepiped having both sides opened.

In some cases, the electrode for electric discharge machining includes an upper body for discharging a current and a lower body for connecting the upper body and the supporter. The upper body is divided into horizontally and semi- And the lower body has a width of the radius of the semicylindrical shape and a rectangular parallelepiped shape having an open top.

The electrode for electric discharge machining includes an upper body for discharging a current and a lower body for connecting the upper body and the supporting portion. The upper body is horizontally laid out and semi-cylindrical opened on both sides, It is also possible that the semi-cylindrical upper body has a height difference between the front and the rear so that the upper body can have a slope, and a shape of a rectangular parallelepiped having open top and both sides is also possible.

A method for collecting a damaged sample of a reactor as well as a sample collecting apparatus using simple discharge machining, comprising the steps of: supplying an electrode liquid to a surface of a sample to be sampled by the discharge liquid supply nozzle; And a discharge machining step of discharging the discharge machining electrode while maintaining a constant gap with the surface of the damaged part for sampling the inner damaged part of the reactor.

Wherein the discharging liquid supplying step includes a nozzle angle adjusting step of performing a front and rear angle adjusting function of the discharge liquid supply nozzle so as to adjust a position where the discharge liquid is supplied according to the shape of the electrode for electric discharge machining A sampling method is possible.

Further, a sampling method including an electrode driving step for rotationally driving the electrode for electric discharge machining is preferable.

A sample collection monitoring step of monitoring a sample collection process using at least one camera, and an electrode installation monitoring step of monitoring an installation position of the electrode using at least one camera.

It is preferable to include a supporting portion driving step of controlling the attitude of the supporting portion so that the electrode for electric discharge machining is positioned on the damaged portion.

Specifically, it is possible to include a tilting driving step of the tilting driving unit for tilting the supporting unit at a predetermined angle from the vertical axis of the apparatus.

Similarly, it is preferable to include the left and right driving steps of the left and right driving units for moving the supporting unit in the left and right directions.

It is also possible to include a back-and-forth driving step of the front-rear driving part for moving the supporting part of the sample-sampling device in the front-back direction.

And finally driving the rotation driving unit to rotationally drive the support unit with the axis parallel to the vertical axis of the apparatus as the rotation axis.

Specifically, the supporting unit driving step may include a sampling method including a vertical driving step of the up and down driving unit used to drive the supporting unit up and down.

The apparatus and method for sampling a reactor head nozzle of the present invention as described above require precise damage analysis in order to prevent recurrence of damage caused by SCC (Stress Corrosion Cracking) of INCONEL 600 according to operation of a reactor for a long period of time In order to analyze the cause of damage, the present invention provides an apparatus and a method for collecting a damaged part, thereby providing an automated device capable of preserving a damaged original shape, thereby enabling safe sampling.

1 is a vertical sectional view of a reactor head nozzle unit.
2 is a perspective view of the sample collecting apparatus.
Figure 3 is a schematic diagram showing the steps of the method of the invention.
4 is a front view of the sample collecting apparatus.
5 is a side view of the sample collecting apparatus.
6 is a front enlarged view of the electrode for electric discharge machining.
7 is a side enlarged view of the electrode for electric discharge machining.
8 is a side view of an available embodiment of an electrode for electric discharge machining.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the embodiments of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the difference that the embodiments of the present invention are not conclusive.

In describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are intended to distinguish the constituent elements from other constituent elements, and the terms do not limit the nature, order or order of the constituent elements. When a component is described as being "connected", "coupled", or "connected" to another component, the component may be directly connected or connected to the other component, Quot; may be "connected," "coupled," or "connected. &Quot;

4 and 5, and the apparatus shown in Figs. 4 and 5 is used as the center axis of the apparatus for electric discharge machining Means an imaginary axis bisected by the 'center axis of the device'.

The term "Sampling Head" of the present invention means a series of configurations including an electrode assembly, a supporting part, a discharge solution receiving part, a lower driving part, etc. The sampling device includes a " Sampling Head " And a positioning means for moving the sampling head. In the following embodiments, the sampling head will be mainly described.

The present invention provides an apparatus and method for sampling a nuclear power generator in which a nuclear reactor is installed.

As described above, the present invention provides a solution to the problem of recurrence of SCC (Stress Corrosion Cracking) damage in the nozzle part of a reactor head (1) due to long-term operation of a nuclear power plant, .

Hereinafter, this process will be described in detail.

First, referring to FIG. 1, 83 CRDM nozzles 2, one exhaust pipe 4, a guide cone 3 installed at the lower end of the nozzle, and an exhaust pipe (not shown) along with a vertical section of the reactor head 1 having a diameter of about 4 m 4 is shown.

At this time, INCONEL 600 is welded between the reactor head 1, the CRDM nozzle 2, and the exhaust pipe 4 as an abradable material. Further, the width of the welded portion 5 is at most 20 mm, and the width and the depth increase depending on the installation position due to the geometrical arrangement.

If there is any damage inside the nuclear power generator with such facilities, it is necessary to take the sample of the damaged area and study it in order to identify the cause of the damage and prevent recurrence.

However, taking into account that the sampling site is the inside of the nuclear power plant where uranium is used as the raw material for the power generation, it is considered that the risk of contamination from various radioactive materials , It is an extremely dangerous task.

Therefore, a Sampling Head is shown in Figures 2, 4 and 5, which can be used directly in the field on behalf of the operator to sample a damaged area inside the nuclear power plant.

2, the sampling head, which is attached to the lowermost sampling head fixing portion and moved to the vicinity of the operation site by the manipulator, is vertically moved by the lower driving portion 40 for precise and quick control to the damaged portion, Left and right, forward and backward, and tilting drive, and the sample collection apparatus that has completed the movement enters the sample collection operation in earnest.

These sampling devices consist of Sampling Head, control device to control the entire sampling work, camera for monitoring sampling position of Sampling Head, discharge fluid supply device and EDM power source for EDM .

Hereinafter, a description of specific roles of the respective components will be described with reference to FIGS. 4 and 5. FIG.

The main components included in the sampling head include a discharge which is located at the uppermost part of the sampling head and discharges intermittently between the working electrode and the workpiece among the insulating working fluid to transfer and process the shape of the section like the working electrode to the workpiece There is an electrode for electric discharge machining 10 that performs processing and takes a direct sample at a damaged portion.

Further, the electrode for electric discharge machining can have various shapes described below.

In addition, there are an electrode driving unit 17 and an electrode fixing unit 11 for independently rotating and driving the electrode 10 for electric discharge machining so as to precisely position the electrode 10 for electric discharge machining with respect to a damage site inside the power plant.

A rectangular columnar support portion 19 extending from the lower end of the electrode driver 17 is positioned below the electrode driver 17.

In one side of the support portion 19, intermittent discharge is performed between the machining electrode and the workpiece in an insulating working fluid (discharge fluid) such as kerosene to form the shape of a cross section like the machining electrode on the workpiece A discharge liquid supply nozzle 18 for spraying and supplying a discharge liquid (a processing liquid) is provided for performing discharge processing, which is a principle of transfer and processing. This discharge liquid supply nozzle 18 has a circular tubular- And the nozzle tube 14 includes a nozzle tube lower end portion having linearity and a nozzle tube upper end portion bent from the upper portion of the nozzle tube lower portion toward the support portion.

A discharge liquid supply nozzle 18 for spraying and supplying a discharge liquid (machining liquid) to perform the electric discharge machining is provided at a position relatively lower than the installation position of the discharge liquid supply nozzle 18 formed in the support portion 19, For preventing the diffusion of the discharge liquid supplied through the inner surface and for recovering and reusing. The shape of the disk is composed of an inner surface and an outer surface, and the outer surface has a tapered shape And the discharge liquid receiving portion 30 is formed.

At least one process monitoring camera (21) is installed on the upper portion of the discharge liquid receiver (30) to monitor the sampling process in real time by being positioned at the upper edge of the discharge liquid receiver. And at least one electrode monitoring camera (20) installed near the support part on the upper part of the total receiver to monitor the process of positioning the electrodes.

In addition, the discharge liquid supply device and the discharge liquid receiver 30 eject and discharge the discharge liquid through the discharge liquid supply nozzle tube 14 to the sample collection position to smoothly collect the liquid, The entire amount can be recovered, filtered and reused by using the discharge solution receiver 30 to prevent waste of the discharge liquid and to minimize the radioactive contaminants generated in the sample collection process.

The lower part of the sampling head is constituted by driving units 40 for precise control of the sampling position.

The arrangements of the driving unit 40 described below may be changed in the order of mutual arrangement within the range where the functions are not changed.

The outer diameter of the CRDM nozzle 2 deviates from the center of the reactor head 1 and the outer diameter of the driving unit 40 of the sampling head during sampling of the CRDM nozzle 2 welding portion 5, A tilting shaft driving unit 41 and a driving motor 42 used for changing the angle of the upper portion except the discharge liquid receiver 30 are located at the uppermost stage of the driving unit 40 of the sampling head, The tilting shaft drive motor 42 operates to control the angle of the upper portion of the sampling head except for the driving unit 40 and the discharge liquid receiver 30. [

In addition, the 'left and right driving unit 43 and the left and right driving motors 44', 'the front and rear driving unit 45 and the front and rear driving motor 46' are disposed at the lower ends of the 'tilting shaft driving unit 41 and the driving motor 42' And is used for left and right and front and rear driving of a device fixed on the upper part of the tilting axis driving part 41 including the tilting axis.

The 'left and right driving part 43 and left and right driving motor 44', 'front and rear driving part 45 and front and rear driving motor 46' are generally operated after the sampling head is disposed through the manipulator, The working electrode 10 is driven so as to enable fine control so that a more precise and delicate approach to the sampling part can be obtained and accurate sampling can be performed.

The positions of the 'left and right driving unit 43 and the left and right driving motors 44', 'front and rear driving unit 45 and front and rear driving motor 46' are located on the extension line of the central axis of the apparatus, The right and left driving units 43 and the left and right driving motors 44 are located below the driving motors 41 and 41 and the left and right driving units 43 and the left and right driving motors 44 ' It is preferable that the front and rear driving part 45 and the front and rear driving motor 46 are positioned.

In addition, there are a 'rotation drive unit 47 and a rotation drive motor 48' for rotating 360 degrees of the entire structure fixed on the front and rear drive unit 45 and the front and rear drive motor, 47 and the rotation drive motor 48 'do not mean rotational motion in the upward and downward directions, but mean 360 degrees of rotation in the left and right directions.

When the shape of the electrode 10 for electric discharge machining is protruded through the rotational motion of the rotation drive unit 47 and the rotation drive motor 48, the protruding portion of the electrode 10 for electric discharge machining is used as a sample Perform a precise rotational motion to contact the area to be sampled.

In order to bring the electrode into contact with a portion to be sampled, the upper and lower driving unit 49, the support bar 52, and the up and down driving motor 50 are installed.

 The upper and lower drive unit 49 and the support bar 52 and the up and down drive motor 50 are located at the lower ends of the rotation drive unit 47 and the rotation drive motor 48.

The up and down driving unit 49, the support bar 52 and the up and down driving motor 50 perform a precise up and down movement to bring the electrode for electric discharge machining into contact with a portion to be sampled.

Finally, the sampling head is fixed to the manipulator to secure the sampling head.

6 and 7, this is an enlarged view of the electrode 10 for electric discharge machining and the electrode fixing portion 11 of the sampling head.

The circular electrode fixing part 11 transfers power to the electrode where discharge machining is performed for sample collection and the power transmission method is a method in which the electrode fixing part 11 that rotates when the electric wire is directly connected to the electrode fixing part 11 (Power supply) brush 12 between the electrode terminal and the electrode fixing portion 11 in order to prevent twisting of the electric wire by the electrode terminal and the electrode fixing portion 11.

Also, in order to supply the discharge liquid to the sample collecting part, the discharge liquid is supplied to the two discharge liquid supply nozzles in the discharge liquid supply nozzle fixing part 15 in a divided manner.

Finally, Figure 8 illustrates an example of an electrode shape design in accordance with the present invention. Referring to FIG. 8, the shape of the electrode can be formed into various shapes according to the position of the sampling and the shape of the sample to be sampled.

The electrode type 1 61 shown in the figure is a shape having a circular or elliptical shape in cross section (upper part of the electrode) of the sample taken in a form suitable for sample collection on the exhaust pipe 4 and the reactor head 1 surface. The electrode type 2 (62) is an electrode having a long rectangular cross-sectional shape and is suitable for sampling a part of the welded portion (5) of the CRDM nozzle (2). Electrode type 3 (63) shows a form in which samples of the inner and outer surfaces of the CRDM nozzle 2 can be sampled.

The size of such a sample-collecting electrode is possible by changing the interval and the height. In addition, the shape of the electrode can be variously shaped by fixing the electrode to the electrode fixing part 11 in a desired cross-sectional shape and fixing it.

The controller shown in the above embodiment controls the position of the sampling head composed of a plurality of drive shafts with respect to each axis to position the electrode for electric discharge machining 10 at the sampling position, It is possible to precisely control the sampling position of the head.

Further, when the upper surface of the electrode 10 for electric discharge machining is in contact with the machining surface, the control device locates the position of the support of the reactor head 1 in the direction of the support using the minute current flowing in the electrode. In addition, the control device controls the speed of gauging during sample collection, discharge machining current and voltage, and on / off time.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. That is, within the scope of the present invention, all of the components may be selectively coupled to one or more of them. Furthermore, the terms "comprises", "comprising", or "having" described above mean that a component can be implanted unless otherwise specifically stated, But should be construed as including other elements. All terms, including technical and scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, unless otherwise defined. Commonly used terms, such as predefined terms, should be interpreted to be consistent with the contextual meanings of the related art, and are not to be construed as ideal or overly formal, unless expressly defined to the contrary.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

1: reactor head
2: CRDM nozzle
3: Guide cone
4: Exhaust pipe
5: CRDM nozzle and exhaust pipe weld
10: Electrode for discharge machining
11: electrode fixing portion
12: Power supply brush
13: Power terminal
14: Nozzle tube
15: Supply liquid supply nozzle fixing portion
16: Nozzle angle adjustment dial
17:
18: Electrode discharge liquid supply nozzle
19: Support
20: Electrode monitoring camera
21: Process monitoring camera
30: Receiving money
40:
41:
42: tilting drive motor
43:
44: Left and right drive motor
45:
46: Front and rear drive motor
47:
48: Rotary drive motor
49:
50: Up and down drive motor
51: Up and down drive shaft
52: Support bar
61: Electrode type 1
61a: electrode type 1 upper body
61b: Electrode type 1 Lower body
62: Electrode type 2
63: Electrode type 3
63a: electrode type 3 upper body
63b: electrode type 3 sub-body
r: Radius
h: height difference

Claims (26)

CLAIMS 1. A sampling device for sampling a damaged part of a reactor,
An electrode for electric discharge machining 10 for discharging machining while maintaining a certain gap with the surface of the damaged part for collecting a sample of the inside damaged part of the reactor; And
And an electrode discharge liquid supply nozzle (18) for supplying a discharge liquid to the damaged portion surface,
The electrode for electric discharge machining is subjected to electric discharge machining in a state in which the discharge liquid is supplied to the object to be sampled by the electrode discharge liquid supply nozzle unit (18)
Wherein the electrode discharge liquid supply nozzles 18 are provided in a pair and each end of the electrode discharge liquid supply nozzle 18 is provided at a predetermined distance from both sides of the electrode 10 for electric discharge machining. Collecting device.

The method according to claim 1,
(30) for recovering the discharge liquid, wherein the discharge liquid receiver (30) is constituted by an inner surface and an outer surface, and the outer surface is tapered upward by a predetermined angle relative to the inner surface A sample collection device.
The method according to claim 1,
And a support portion 19 extending downward from the electrode for electric discharge machining 10. The electrode discharge liquid supply nozzle 18 includes a discharge liquid supply nozzle fixing portion 15 provided at one side of the support portion 19, And a pair of nozzle tubes (14) extending upward from the discharge liquid supply nozzle fixing part (15).
The method of claim 3,
Each of the nozzle tubes 14 extends in a state of being tilted at a predetermined angle from the support portion so as to be distanced from the discharge liquid supply nozzle fixing portion 15 toward the electric discharge machining electrode 10, And the end of the nozzle tube (14) is bent toward a point on the extension line of the support part so that the distance between them is narrowed.
The method of claim 3,
The discharge liquid supply nozzle fixing portion 15 adjusts the angle of the front and rear of the pair of nozzle tubes 14 so that the position of the discharge liquid can be adjusted according to the shape of the electrode 10 for electric discharge machining And a dial (16).
The method according to claim 1,
An electrode driving unit (17) for rotating and driving the electric discharge machining electrode (10), and a power supply brush (12) for supplying power even in a state in which the electrode is rotated.
The method according to claim 1,
At least one process monitoring camera (21) for monitoring the sampling process and at least one electrode monitoring camera (20) for monitoring the position of the electrode.
The method of claim 3,
And a driving unit (40) disposed below the discharge liquid receiver (30) for controlling the posture of the support unit (19).
9. The method of claim 8,
The driving unit (40) includes a tilting driving unit (41) for tilting the supporting unit (19) at a predetermined angle from the vertical axis of the apparatus.
9. The method of claim 8,
The driving unit (40) includes a left and right driving unit (43) for moving the supporting unit (19) in the left and right directions.
9. The method of claim 8,
The driving unit (40) includes a front-rear driving unit (45) for moving the supporting unit (19) in the forward and backward directions.
9. The method of claim 8,
Wherein the driving unit (40) includes a rotation driving unit (47) for rotating the support unit (19) with the axis parallel to the vertical axis of the apparatus as a rotation axis.
9. The method of claim 8,
The driving unit 40 includes a vertical driving unit 49 for moving the supporting unit 19 in the vertical direction,
And a plurality of support bars (52) are arranged around the up / down drive part (49).
The method according to claim 1,
Wherein the electrode for electric discharge machining (10) has a shape of a rectangular parallelepiped having both sides opened.
The method according to claim 1,
And a support portion (19) extending downward from the electrode for electric discharge machining (10)
The electrode for electric discharge machining (10)
An upper body 61a for discharging a current and a lower body 61b for connecting the upper body 61a and the supporting portion 19,
The upper body 61a has a semi-cylindrical shape in which the upper body 61a is divided horizontally,
Wherein the lower body (61b) has a width (r) of the semicylindrical shape and a rectangular parallelepiped shape with an open top.
The method according to claim 1,
And a support portion (19) extending downward from the electrode for electric discharge machining (10)
The electrode for electric discharge machining (10)
An upper body 63a for discharging a current and a lower body 63b for connecting the upper body 63a and the supporting portion 19,
The upper body 63a is horizontally laid open and semi-cylindrical opened on both sides. The lower body 63b has a height difference between the front and rear surfaces so that the semi-cylindrical upper body 63a can have a slope. (h) and having a shape of a rectangular parallelepiped having open top and both sides.
A method for sampling a damaged portion of a nuclear reactor,
A discharging liquid supplying step of supplying the discharging liquid to the surface of the damaged part by the discharging liquid supply nozzle (18); And
And an electric discharge machining step of performing electric discharge machining while keeping the gap between the damaged part surface and the electrode for electric discharge machining 10 constant,
In the discharge machining step, the electrode discharge liquid supply nozzle unit 18 performs discharge machining in a state in which the discharge liquid is supplied to the sample to be sampled,
The discharge liquid supplying step supplies the discharge liquid to the surface of the damaged part in a state in which the respective ends of the electrode discharge liquid supply nozzles 18 are provided at a pair of spaced apart from each other on both sides of the electrode 10 for electric discharge machining And the sample is collected.
18. The method of claim 17,
The supplying step of supplying the discharge liquid may include a nozzle angle adjusting step of adjusting the forward and backward angles of the discharge liquid supply nozzle 18 so as to adjust a position where the discharge liquid is supplied according to the shape of the electrode 10 for electric discharge machining Including methods of sampling.
18. The method of claim 17,
Wherein the discharging liquid supplying step includes an electrode driving step of rotationally driving the electrode for electric discharge machining (10).
18. The method of claim 17,
Wherein the discharging liquid supplying step includes a process monitoring step of monitoring the sampling process using at least one camera and an electrode monitoring step of monitoring the position of the electrode using at least one camera.
18. The method of claim 17,
Wherein the discharging liquid supplying step includes a supporting part driving step of controlling the attitude of the supporting part (19) so that the electrode for electric discharge machining (10) is positioned on the damaged part.
22. The method of claim 21,
Wherein the supporting portion driving step includes a tilting driving step of tilting the support portion (19) at a certain angle from the vertical axis of the apparatus.
22. The method of claim 21,
The supporting part driving step includes a left and right driving step of moving the supporting part (19) in the left and right directions.
22. The method of claim 21,
Wherein the supporting part driving step includes a back-and-forth driving step of moving the supporting part (19) in the forward and backward directions.
22. The method of claim 21,
Wherein the supporting portion driving step includes a rotation driving step of rotating the supporting portion (19) with the axis parallel to the device vertical axis as a rotation axis.
22. The method of claim 21,
The supporting part driving step includes a vertical driving step of moving the supporting part (19) in a vertical direction.

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