JP5646972B2 - Pipe tearing device and tearing method used in nuclear power plants, etc. - Google Patents

Description

  The present invention relates to a tube tearing device and tearing method, and more particularly to a tube tearing device and tearing method for a tube exposed to a radioactive material or a fluid having a possibility of containing the same, and more particularly to dismantling or renewing a facility of a nuclear power plant. The present invention relates to a tearing device and a tearing method for a thin tube for a heat exchanger to be discarded.

  Of the waste generated when the nuclear power plant is dismantled or the equipment is renewed, only a small amount of radioactive waste is produced, and most of the waste has a very low radioactivity level and does not need to be treated as radioactive waste (“clearance level”). The following) and not radioactive waste. Currently, the “clearance level” is set to 1/100 or less of the dose that humans receive from the natural radioactivity in daily life (see “Development of clearance system in nuclear facilities”, published by the Ministry of Economy, Trade and Industry, Nuclear Power NISA Radioactive Waste Regulation Division).

  However, even if it is not necessary to treat as radioactive waste or it is assumed that it is not radioactive waste, if the level of radioactivity cannot be measured, all of it is treated as radioactive waste by law or regulation. Will be processed. As a result, in general, there arises a problem that the amount of waste disposed as low-level radioactive waste increases, and a problem that originally reusable resources are discarded. The following Patent Documents 1 to 7 propose a processing method for thin tubes used in nuclear power plants and the like.

  Patent Document 1 discloses a method of halving a small-diameter pipe used in a nuclear power plant, in which a pipe is pressed into a flat tube, both sides in the longitudinal direction of the flat tube are cut over the entire length, and two flat tubes are formed. There has been proposed a method of dividing a plate-like body into two side cut pieces having the same length.

  Patent Document 2 discloses a waste treatment of a low-level radioactive thin-walled tube, in which the thin-walled tube is vertically cut and expanded over the entire length in the longitudinal direction, and further pressed to form a flat plate material. Processing has been proposed.

  In Patent Document 3, a tube contaminated with a radioactive substance is crushed, both sides of the crushed tube are cut off over the entire length in the longitudinal direction, and the two long ends cut off are discarded as radioactive waste. A method has been proposed in which the state of contamination of the remaining two upper and lower plates is measured to recycle the plates.

  In Patent Document 4, a heat exchange tube contaminated with radioactivity is crushed into a flat plate, and the flat plate is fed in the width direction by feeding the flat plate in the longitudinal direction while applying a blade to the center of the flat plate in the width direction. A method of dividing into two has been proposed.

  In Patent Document 5, a small-diameter pipe used in a nuclear power plant is sandwiched in the radial direction, a pair of cutting disks are arranged, and the small-diameter pipe is moved by a pair of cutting disks while moving the small-diameter pipe in the longitudinal direction. Has been proposed that bisects the entire length of the frame in the longitudinal direction.

  In Patent Document 6, a small-diameter pipe used in a nuclear power plant is sandwiched in the radial direction, a pair of plasma torches are arranged, the pair of plasma torches are moved in the longitudinal direction, and the small-diameter pipe is moved in the longitudinal direction. A method of dividing the entire length into two has been proposed.

  Patent Document 7 proposes a method in which a band saw is first applied to an end face of a tube placed obliquely, and the tube is cut over the entire length in the longitudinal direction while moving the band saw obliquely.

Japanese Patent No. 4509732 Japanese Patent No. 4373869 Japanese Patent No. 4549269 JP-A-6-51098 Japanese Patent Laid-Open No. 2005-7483 JP 2006-150394 A JP 2007-90499 A

  According to the inventions of Patent Documents 1 and 3, since both ends in the radial direction of the pipe are cut over the entire length in the longitudinal direction, two long end materials can be formed. The invention of Patent Document 2 also cuts the center in the width direction of the tube over the entire length in the longitudinal direction, so that the amount of generated cutting waste increases. The two long scraps or chips generated in this way cannot be reused and disposed of as low-level radioactive waste because their radioactivity levels cannot be accurately measured. The problem is that the amount of waste increases.

  According to the invention of Patent Document 4, since the flat plate crushed tube is cut over the entire length in the longitudinal direction, the amount of chips increases. Since chips cannot accurately measure their radioactivity levels, they cannot be reused eventually, resulting in an increase in the amount of waste disposed as low-level radioactive waste. In addition, according to the present invention, the cut portion is obstructed, or the conveyance of the flat plate is hindered by the collision between the blade and the flat plate. It is considered difficult.

  According to the inventions of Patent Documents 5 and 7, since the pipe is cut over the entire length in the longitudinal direction, the amount of cutting waste increases. Since cutting waste cannot accurately measure their radioactivity level, it cannot be reused eventually, resulting in an increase in the amount of waste that is disposed of as low-level radioactive waste. Also, the resulting tube with a semi-circular cross section cannot accurately measure its radioactivity level, so it cannot be reused eventually, increasing the amount of waste disposed of as low level radioactive waste. The problem arises.

  In order to accurately measure the radioactivity level, the distance between the probe of the survey meter and the object to be measured needs to be appropriate. For example, a U-shaped tube having a groove with a semicircular cross section obtained by dividing a thin tube such as a heat exchanger in the longitudinal direction has a very narrow groove. Levels cannot be measured accurately with acceptable accuracy.

  According to Patent Document 6, the obtained capillary having a semicircular cross section cannot be measured accurately because it cannot accurately measure its radioactivity level, and is eventually disposed of as low-level radioactive waste. The problem is that the amount of waste increases. In addition, there is a problem that the plasma device of Patent Document 6 cannot be used in places where there is a restriction on the use of fire, such as a radiation control area of a nuclear power plant.

  The object of the present invention is to contribute to reducing the volume of radioactive waste in the disposal of pipes generated by dismantling of nuclear power plants or the like and equipment replacement, particularly in the disposal of pipes such as thin tubes for heat exchangers, To provide a tearing device and a tearing method for pipes used in nuclear power plants and the like that contribute to promoting the reuse of waste.

  The present invention, in a first aspect, is a device for treating a tube exposed to a fluid containing or possibly containing a radioactive substance, the press machine for crushing and flattening the tube, and a flattening The tube is flattened by cutting off both corners of the tip of the tube and cutting the tip into two tongues, and by grasping and pulling the two tongues. And a splitting device for tearing both sides of the tube in the longitudinal direction in the longitudinal direction to form two thin plates.

The present invention, in a second aspect, is a device for treating a tube exposed to a fluid containing or possibly containing a radioactive substance, wherein the tube is flattened and further, the tip of the tube The two corners are grooved so as to form the end portions of the two thin plates by cutting, and the end portions of the two thin plates (two tongue-shaped portions (flat plate end portions)) ) by pulling grabbed, the widthwise sides of the flattened the tube tear longitudinally has a divider, which forms the two sheets of thin, provides a tearing device of the tube.

  According to a third aspect of the present invention, there is provided a method for treating a tube exposed to a fluid containing or possibly containing a radioactive substance, the pressing step for crushing and flattening the tube, and flattening By cutting off both corners of the distal end of the tube, the groove is formed into two tongues, and a flattening process is performed by grasping and pulling the two tongues. A tearing step of tearing both sides in the width direction of the formed tube in the longitudinal direction to form two thin plates, and a method for tearing the tube.

  According to the present invention, when a pipe used in a nuclear power plant or the like is disposed of, the pipe can be processed into a thin plate so that the measurement of the radioactivity level of the pipe can be performed with an allowable accuracy. In this processing, since only a small part of the end of the tube is cut, the amount of cutting waste and irregularly shaped cutting edges that are difficult to accurately measure the radioactivity level is reduced. As a result, the amount of radioactive waste that must be disposed of as low-level radioactive waste is reduced.

  According to the present invention, by splitting the tube into a plurality of thin plates by tearing, cutting waste and cutting pieces are not generated, so that generation of dust is prevented, and in addition, vibration in the tearing process is similar to that in the cutting process. As a result, the working environment is kept good. Further, the tearing process and the equipment of the present invention are greatly simplified as compared with the case where the tube is cut or burned over the entire length in the longitudinal direction. Therefore, the tearing equipment according to the present invention can be installed with sufficient margin even in the premises of nuclear power plants where space is limited.

  Thus, according to the present invention, in the treatment of waste generated by the dismantling of nuclear power plants or the renewal of equipment, particularly the disposal of thin tubes provided in heat exchangers, etc., the effective use of waste below the clearance level is promoted. Thus, the amount of waste disposed as low-level radioactive waste can be reduced.

Further, effects that can be obtained by the present invention are exemplified below:
A. The pipe can be torn, split and thinned with a small force according to the fracture strength of the material without being affected by the size of the pipe, eg pipe diameter or length;
B. The processing time required for thinning the tube is reduced;
C. Very few consumables in equipment for tearing pipes;
D. By tearing the tube, a flat sheet that can be easily decontaminated or measured for radioactivity level can be easily obtained.

It is explanatory drawing which shows the outline of the tear apparatus and tear method which concern on one Example of this invention. (A) And (B) is explanatory drawing which shows two types of press machines and the press process of the tearing apparatus which concerns on one Example of this invention. (A) And (B) is explanatory drawing which shows the cutting machine and groove process of a tearing device which concerns on one Example of this invention, and the flat plate by which groove processing was carried out. (A) And (B) is explanatory drawing which shows the divider | division machine and division | segmentation process of the tearing apparatus which concern on one Example of this invention. (It is explanatory drawing which shows the decontamination machine of the tearing apparatus which concerns on one Example of this invention. It is explanatory drawing which shows the survey apparatus attached to the tearing apparatus which concerns on one Example of this invention. It is a front view which shows the structural example of the division machine of the tearing device which concerns on one Example of this invention. It is a figure explaining the principle of tearing of the flattened tube by the tearing device concerning one example of the present invention. (A) And (B) is explanatory drawing which shows an example of the pre-processing of the pipe | tube processed by the tearing apparatus which concerns on one Example of this invention.

  In the divider according to a preferred embodiment of the present invention, the two tongue portions are wound around each other, and a pair of rolls sandwiching the flattened tube and a pair of rolls are rotatably supported. A pair of bearings, a gripping mechanism that grips the two tongues wound around the pair of rolls, and a power mechanism that pulls the two tongues via the gripping mechanism.

  In a preferred embodiment of the present invention, the length in the longitudinal direction (tube axis direction) at both corners of the tip of a tube (flat plate) that is partially cut off is basically the length of the tongue-like portion to be formed. Any length that can be gripped by the gripping mechanism is sufficient. However, when the roll is used as a tearing jig as described above, this length is equal to the length wound around the roll in addition to the length gripped by the gripping mechanism. I just need it.

The present invention relates to the disposal of pipes used in radiation control areas, or pipes that may have been exposed to gases or liquids such as steam or water containing radioactive substances such as CO ⁶⁰ and to which radioactive substances have adhered, Is preferably applied to effective use. For example, the present invention is suitably applied to reuse of heat exchange capillaries (heating tubes / cooling tubes) of a heat exchanger of a nuclear power plant. At present, the narrow tubes of heat exchangers installed at nuclear power plants have a very small inner diameter, so they cannot be subjected to contamination inspection (measurement of radioactivity level), and decontamination is difficult. It is disposed of as radioactive waste. In this case, since the feed water heater is loaded with 1000 or more heat exchange capillaries per unit, as many as 65 radioactive cans (200 L equivalent) are generated per feed water heater. Become. According to the present invention, a thin tube can be easily processed into a shape that is easy for contamination inspection or decontamination. As a result, those that are not contaminated below the clearance level can be reused, and the volume of low-level radioactive waste can be reduced (65 cans to 3 cans). The present invention can also be suitably applied to narrow tubes such as instrumentation tubes used in nuclear power plants. Further, the present invention is suitably applied to stainless steel pipes, copper pipes, titanium pipes, other metal pipes, or tearable pipes used in nuclear power plants and the like.

  The present invention is suitable for tearing a thin tube having an outer diameter of about 15 mm and a tube thickness of about 1 mm. Further, the present invention can be applied to tearing of a tube having a tube thickness much thinner than 1 mm or a very thick tube. When tearing a pipe having a very thick pipe thickness, for example, to tear a pipe having a pipe thickness of 5 mm or more, it is possible to appropriately cut or crease or reduce the plate thickness by scraping. Good.

  The method of tearing a pipe according to a preferred embodiment of the present invention includes a step of flattening a pipe, a step of groove-processing the end of the flattened pipe, and both ends of the pipe subjected to the groove processing (two sheets). And then splitting the flattened tube into two thin plates by tearing the tube while gripping the tongue and the upper and lower lips).

  In a preferred embodiment of the present invention, the distal end portion is partially cut off so that the distal end portion of the flattened tube becomes two tongue-shaped portions. Further, in a preferred embodiment of the present invention, both the corners of the tip of the flattened tube are respectively cut off into a straight line, a curved line or an R shape, or both sides of the tip of the flattened tube are cut off obliquely, The both ends of the flattened longitudinal end portion of the flattened tube are cut off obliquely with respect to the longitudinal direction and the width direction from the inner side in the width direction to the outer side in the width direction.

  According to a preferred embodiment of the present invention, the press machine, the cutting machine, and the dividing machine, which are the components of the tearing device of the present invention, are integrally or continuously configured to improve efficiency. According to another preferred embodiment, the press machine, the cutting machine, and the dividing machine are configured separately or discontinuously, and each component is arranged in an empty space in the nuclear power plant premises.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory view showing an outline of a tearing device and a tearing method according to one embodiment of the present invention.

  Referring to FIG. 1, a tearing device according to one embodiment of the present invention is produced by dismantling or renewing equipment such as a tube exposed to a fluid containing or possibly containing radioactive material, particularly a nuclear power plant. Treatment of pipes to be discarded, for example, heat exchanger (feed water heater) 101 using steam (turbine extraction steam) generated in the reactor 100 for heating feed water, or turbine exhaust steam by cooling water (seawater) It is used for the disposal of thin tubes (thin tubes, heating tubes / cooling tubes) 1, 1,..., 1 that are loaded in the heat exchanger (condenser) 101 for returning to the condensate. The

  This tearing device includes a press 10 that crushes and flattenes the tube 1 and a flattened tube, that is, cuts off both corners of the distal end of the flat plate 2 (see the cut pieces 2a and 2a). A cutting machine 20 that cuts the tip of the flat plate 2 into two tongues 2b, 2b and a flattened tube 1 or flattened by grasping and pulling the two tongues 2b, 2b. A dividing machine 30 that tears both sides in the width direction of the flat plate 2 in the longitudinal direction to form two thin plates 3 and 3.

  This tearing device first executes a pressing step for crushing and flattening the tube 1, and then cutting off both corners of the flattened tube 1, that is, the tip of the flat plate 2. A flattened tube 1 or flat plate is obtained by performing a groove processing step of performing groove processing on the two tongue-shaped portions 2b and 2b, and subsequently grasping and pulling the two tongue-shaped portions 2b and 2b. A tearing process is performed in which two thin plates 3 and 3 are formed by tearing both sides in the width direction in the longitudinal direction. Hereinafter, each element and each process of the tearing device according to one embodiment of the present invention will be described in detail in the order of processes.

[1. Press machine, press process]
2 (A) and 2 (B) are explanatory views showing two types of pressing machines and pressing steps of the tearing device according to one embodiment of the present invention. Referring to FIG. 2 (A), a continuous roller press 10 includes a press roller 11 that crushes and flattens a pipe (pipe) 1 having a circular cross section, and a flat roller that is disposed downstream of the press roller 11. And a straightening roller 12 for adjusting the shape of the pipe 1 formed.

  By a press machine 10, a pipe (pipe) 1 having a circular cross section is processed into a flat plate 2 having a cut extending in the width direction and the longitudinal direction at the center in the thickness direction, and connecting both sides in the width direction.

  Instead of the continuous roller press 10 shown in FIG. 2A, an intermittent press press 13 can also be used. The intermittent press type press 13 includes a press 14 that partially and intermittently crushes the pipe 1 to be delivered, and a hydraulic cylinder 15 that drives the press 14 so as to be movable up and down.

[2. Cutting machine, groove process]
FIGS. 3A and 3B are explanatory views showing a cutting machine and a groove process of a tearing device according to an embodiment of the present invention, and a flat plate that has been groove processed, and FIG. FIG. 3B schematically shows a cutting machine and a cutting portion used for the groove of the flattened tube, and FIG. 3B shows the flattened tube.

  Referring to FIGS. 3A and 3B, the cutting machine (one-shot processing machine) 20 cuts off both corners of the flattened tube 1, that is, the tip of the flat plate 2 by one-shot processing. The tip is grooved into two tongues 2b, 2b. For example, both sides of the distal end portion of the flat plate 2 are cut off obliquely (partially) with respect to the longitudinal direction and the width direction from the inner side in the width direction to the outer side in the width direction. The length to be cut off may be such that the divider 30 in the subsequent process can grasp the two tongue-like portions 2b and 2b, so that the volume of the cut pieces 2a and 2a becomes extremely small.

  In addition, folds 2c and 2c are formed by punching in the vicinity of the roots of the tongues 2b and 2b so that the two tongues 2b and 2b can be easily wound around a roll 31 (see FIG. 4A) described later. You may keep it.

[3. Splitting machine, splitting process (splitting process, tearing process)]
4 (A) and 4 (B) are explanatory views showing a splitting device and a splitting process of the tearing device according to one embodiment of the present invention, in which FIG. 4 (A) is a front view and FIG. It is a B arrow directional view of (A).

  Referring to FIGS. 4A and 4B, the divider 30 includes a pair of rolls (brace breaker rolls) 31 and 31 that sandwich the flat plate 2 while the two tongue-like portions 2 b and 2 b are wound around, respectively. A pair of bearings 32 and 32 that rotatably support the pair of rolls 31 and 31, a gripping mechanism 33 that grips two tongue-shaped portions wound around the pair of rolls 31 and 31, and a gripping mechanism 33, respectively. And a power mechanism 34 for pulling the two tongue-like portions 2b, 2b through.

  The divider 30 winds two tongues 2b, 2b around a pair of rolls 31, 31, respectively, and sandwiches the flattened tube 1, that is, the flat plate 2, between the pair of rolls 31, 31, and a power mechanism 34. However, by continuing to pull the two tongue-like portions 2b, 2b through the gripping mechanism 33, the flat plate 2 is divided into the two thin plates 3, 3 from the cut at the tip. In addition, as a post process, the obtained thin plate 3 may be subjected to shaping by applying to the press machine 10 shown in FIG. 2 (A) or (B), and the thin plate 3 may be appropriately deburred. Good.

[4. Decontamination machine, decontamination process]
FIG. 5 is an explanatory view showing a decontamination machine for a tearing apparatus according to an embodiment of the present invention. Referring to FIG. 5, the decontamination machine 40 includes a pair of polishing brushes 41, 41, and the thin plate 3 is mechanically decontaminated by the polishing brushes 41, 41. The thin plate 3 may be chemically decontaminated.

[5. Survey equipment, survey process]
FIG. 6 is an explanatory view showing a survey device attached to the tearing device according to one embodiment of the present invention. With reference to FIG. 6, the survey apparatus 50 includes, for example, a GM tube probe 51 and can accurately measure the radioactivity level of the flattened thin plate 3. The thin plate 3 below the clearance level is used for reuse, and the thin plate 3 above the clearance level is again decontaminated or disposed of as low-level radioactive waste.

  Using the tearing device according to one embodiment of the present invention described in the first embodiment, a tear test was performed on a tube having the same specifications as a thin tube loaded in a heat exchanger (feed water heater) of a nuclear power plant. . FIG. 7 is a front view showing a configuration example of a divider of the tearing device according to one embodiment of the present invention.

  4 and 7, the divider 30 shown in FIG. 4 further includes a guide tube 35 into which the flat plate 2 on which the tube 1 is pressed is inserted and which connects the gripping mechanism 33 and the power mechanism 34. ing. The tongues 2b and 2b formed by groove processing of the flat plate 2 are respectively wound around the pair of rolls 31 and 31 and then inserted into both ends of the gripping mechanism 33 and provided at both ends of the gripping mechanism 33. The holding mechanism 33 is fastened by the screws 33a and 33a. Further, a spring balance 36 for measuring the tearing force was connected between the power mechanism 34 and the guide tube 35 having the gripping mechanism 33. Using this divider 30, the following flattened pipe 1 was split by tearing using a small and general-purpose chain block as the power mechanism 34.

Pipe 1 specifications:
Outer diameter 15.875mm
Thickness 1.0mm
Length 15833mm
Material SUS304TB
Specification of roll (brace breaker roll) 31: φ60

  As a result of the test, the tube 1 guided by the guide tube 35 is torn into two from the center in the thickness direction of the tube (flat plate 2) 1 simply by pulling up the gripping mechanism 33 that grips the tongues 2 and 2. Two thin plates 3 and 3 were obtained.

  FIG. 8 is a view for explaining the principle of tearing a flattened tube by the tearing device according to one embodiment of the present invention. Referring to FIG. 8, the “pulling force” required for tearing by the power mechanism 34 is defined as “power for tearing the tube in the longitudinal direction by 1 mm per second”, and the cutting of the tongues 2 and 2 is cut off. Considering that the stress of the root part becomes very high due to stress concentration due to the notch, if the dividing point is inclined by 2 degrees from the roller center line, it is calculated as follows according to the fracture strength determined by the material And was found to be very small. Thus, it has been found that the tearing device according to the present invention, in particular the divider, can be made very compact.

Pulling force = 655 N / mm ² (Fracture strength of SUS304TB) × 1 × 1 × 2 (cross-sectional area) × sin 2 degrees (direction in which the dividing force acts on the direction of the roller reaction force) = 46 N

  According to the above equation, it can be seen that the pulling force is not affected by the size of the tube 1 but depends on the thickness of the tube 1. Moreover, the winding angle (length) with respect to the roll 31 of the tongue-shaped part 2b of the pipe | tube 1 is set to about 15 to 180 degree | times, for example. When the winding angle is 180 degrees, as shown in FIG. 8, the tongue-like portion 2b is wound around the roll 31 over the half circumference of the roll outer periphery, and when it is 15 degrees, the tongue-like portion 2b is about 1/24 of the roll outer circumference. It will wind around the roll 31 over. Further, as shown in FIG. 4 or 7, the winding angle is set to 180 degrees, that is, the direction in which the tube 1 or the flat plate 2 is drawn and the pulling direction of the tongue-like portion 2b or the thin plate are The entire tearing device is configured in a compact manner.

  In addition, when the thickness of the pipe is very thick, as shown in FIG. 9 (A) or (B), a cut 2d is made in the tip of the dividing point of the pipe 1, or the tip of the dividing point is shaved. It is also effective to reduce the plate thickness by dropping (see the scraping portion 2f).

  Further, a tear test of the SUS pipe was performed by changing the diameter of the roll 34, and further, a tear test of a pipe made of a material other than SUS was performed, and as a result, it was easily tearable with a small force as shown below. In this case, the tearing speed is about 8 m / min (≈130 mm / sec).

Table 1: Results of tear test with different roll diameters for winding SUS304TB Roll diameter Pipe diameter φ x thickness t Pull force kg (N: indicated value of spring gauge 36)
φ50 φ16 × t1.2 200 (1960)
φ60 φ16 × t1.2 200 ~ 250 (1960 ~ 2450)
φ70 φ16 × t1.2 200-250 (1960-2450)

Table 2: Results of tear test of pipes of various materials (roll diameter φ60)
Material Pipe diameter φ x Thickness t Pull force kg (N: Indicated value of spring gauge 36)
C27007 (brass tube) φ19.15 × t1.2 300 to 350 (2940 to 3430)
Same as above φ19.15 × t1.5 400 ~ 450 (3920 ~ 4410)
Ti φ19 × t1.2 300 ~ 400 (2940 ~ 3920)

  INDUSTRIAL APPLICABILITY The present invention is suitably used for disposal of a heat exchanger thin tube of a nuclear power plant or a thin tube such as an instrument tube used in the nuclear power plant, particularly for reuse.

DESCRIPTION OF SYMBOLS 1 Tube 2 Flat plate 2a Cut piece 2b Tongue part 2c Fold 2d Cut 2f Cutting part 3 Thin plate 10 Continuous roller type press 11 Press roller 12 Correction roller 13 Intermittent press type press 14 Press 15 Hydraulic cylinder 20 Cutting machine 30 Divider 31, 31 A pair of rolls (brace breaker roll)
32, 32 A pair of bearings 33 A gripping mechanism 34 A power mechanism 35 A guide tube 36 A spring scale 40 A decontamination machine 41, A pair of polishing brushes 50 A survey device 51 A GM tube probe

Claims (4)

An apparatus for treating a tube exposed to a fluid containing or potentially containing radioactive material,
A pressing machine for crushing and flattening the tube;
A cutting machine that cuts off both corners of the tip of the flattened tube and cuts the tip into two tongues;
A splitter that forms two thin plates by tearing both sides in the width direction of the flattened tube in the longitudinal direction by grasping and pulling the two tongues,
A device for tearing a tube, characterized by comprising: The divider is
A pair of rolls around which the two tongues are wound and sandwich the flattened tube;
A pair of bearings for rotatably supporting the pair of rolls;
A gripping mechanism for gripping the two tongues wound around the pair of rolls,
A power mechanism for pulling the two tongues through the gripping mechanism;
The tube tearing device according to claim 1, comprising: An apparatus for treating a tube exposed to a fluid containing or potentially containing radioactive material,
The tube is flattened, and further, both corners of the distal end portion of the tube are grooved so as to form portions that become the end portions of two thin plates by cutting,
By pulling grasp the portion to be the end of the two sheets of thin, has a divider, which forms the two sheets of thin tore both widthwise sides of the flattened the tube longitudinally, that A tube tearing device. A method of treating a tube exposed to a fluid containing or possibly containing radioactive material, comprising:
A pressing step of crushing and flattening the tube;
A groove processing step of cutting off both corners of the flattened distal end portion of the tube and performing a groove processing of the distal end portion into two tongue-shaped portions;
A tearing step in which the two tongues are grasped and pulled to tear both sides in the width direction of the flattened tube in the longitudinal direction to form two thin plates;
A method of tearing a tube, comprising:

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