KR101197286B1 - Decontamination Device for Inside of Nuclear Reactor - Google Patents

Abstract

PURPOSE: A decontamination device for the inside of a nuclear reactor upper head is provided to prevent damage to a probe by sprinkling water over a gap between a thermal sleeve and a penetration pipe. CONSTITUTION: A decontamination part(1) sprinkles water over a penetration pipe and the inside of the upper head of a nuclear reactor. A driver(2) rotates the decontamination part. A body(3) includes the driver. A utility feeder(4) is composed of a pure water supply line(41) and a compressed air line(42). An injection nozzle decontaminates the outside of the penetration pipe and the inside of the upper head. A gap sprinkling water nozzle decontaminates a gap between a thermal sleeve and the penetration pipe.

Description

Decontamination Device for Inside of Nuclear Reactor

The present invention relates to a decontamination apparatus for removing radioactive material and boric acid and other microparticles inside the upper head of the reactor, and more particularly, a probe (during the volumetric test and the surface test to confirm the integrity of the upper head through-pipe). Decontamination device to remove radioactive materials, boric acid and other fine particles attached to the inside of the upper head of the reactor and through pipes installed in the upper head in order to prevent the progress of the probe, damage and excessive exposure of workers. Using the device, the Open Housing type (Korean type) sprays high pressure spray decontamination throughout the reactor head, and the control rod through-tube with the heat transfer buffer sleeve partially sprays boric acid in the gap, and inside the reactor head. Spray the whole high pressure spray to prevent the progress of the probe and damage, and to expose the workers It relates to a decontamination apparatus for preventing diffusion of radioactive contamination by reducing the dose.

The reactor head is hemispherical, and a plurality of control rod drive mechanisms (CDRMs) through which control rods are moved up and down are vertically fixed to the reactor head.

At this time, the reactor head and the through tube are welded and fixed along the circumference of the through tube protruding downward from the inner circumferential surface of the reactor head. The through tube is usually composed of the reactor head and a dissimilar metal, and withstand pressure, Damage may occur in the welds around the through-tubes in high temperature and high radiation environments.

If the weld is damaged, boric acid, which is a moderator, may leak out of the reactor head through the damaged part, and there is a risk of corrosion of the outside of the reactor head.

In the nuclear power generation where high radiation is generated, the soundness is very important, and it is prescribed to inspect the welded part of the penetration pipe regularly and repair the damaged part.

Since the reactor head has a very high load, it is not inspected while suspended in the air, but is inspected after being placed on a dedicated seating structure. In order to prevent the external exposure of radiation emitted from the reactor head, the seating structure used is composed of an inner cylinder and an outer cylinder having a thick wall, forming a concrete block surface-treated with stainless steel of double cylindrical shape. It consists of a steel frame between the cylinders and a support for supporting the edge of the reactor head.

At this time, the height of the inner cylinder and the outer cylinder is formed high enough to allow people to enter and exit, and the entrance and the exit of the outer cylinder formed in the inner cylinder and the entrance of the outer cylinder are shifted from each other in order to prevent radiation having a straightness to the outside. Is formed.

In the inspection and repair work of the reactor head, we have developed an inspection and repair device that can be remotely controlled by replacing workers to protect workers from radiation exposure.

The upper head through-tube of the reactor is under volume inspection and liquid penetrant inspection (PT) during the planned preventive maintenance period to verify its integrity.

The upper head through tube of the reactor is divided into a control rod through tube of open housing type (Korean type) and a control rod through tube of heat transfer buffer sleeve type.

In the case of control rod through tube volume inspection with heat transfer buffer sleeve, if boric acid is hardened in the sleeve gap, the transducer will not move smoothly and a failure will occur. Remove boric acid precipitated, remove the stuck probe and replace if necessary.

In case of replacement of transducer, malfunction of inspection equipment, and liquid penetrant inspection (PT) inside the upper head of high-contamination, high-radiation area, radiation dose increases and personal pollution or radioactivity occurs depending on the frequency of entry and exit of workers. Substances can scatter and spread the contamination.

Therefore, using a high pressure spray decontamination device for remote control that can decontaminate the inside of the upper head of the reactor, the Open Housing type (Korean type) sprays high pressure spray decontamination throughout the reactor head and the control rod through-tube with the heat transfer buffer sleeve Boric acid in the gap can be sprinkled with high pressure, and spraying high pressure sprinkles the entire inside of the reactor head to reduce the radiation dose of workers and prevent the spread of radioactive contamination.

The maintenance system of the reactor head through-pipe disclosed in Korean Patent No. 10-1080937 is installed on an upper surface of the inner cylinder in a maintenance system for maintaining the reactor head seated on a seating structure including an inner cylinder. A trolley moving along an annular rail unit is installed, and the trolley is provided with a articulated manipulator for maintaining the inner surface of the reactor head, and the manipulator has a link unit for moving a work tool for maintenance work on a horizontal plane. And a decontamination device for removing radioactive material, boric acid, and other fine particles inside the reactor upper head, and a structure including a mast for elevating the link portion is not included.

The inspection system of the nozzle of the through-pipe installed in the reactor head and the through-pipe welded portion, which is disclosed in Korean Patent Publication No. 10-0713954, seats a reactor head having a bolt hole formed on its outer periphery in a dedicated stand, and includes a sleeve installed in the reactor head. A non-destructive inspection system for non-destructive inspection of a nozzle of a through pipe, a nozzle of a through pipe without a sleeve, and a through pipe welded portion, the track being located on the dedicated stand and configured to separate and assemble at least two bodies; A wing installed at left and right sides of the track and having a groove formed therein; A fixed shaft for fixing the track to the reactor head by a fixing member provided at both sides of the bolt hole formed in the reactor head and a thread formed in the groove of the wing, respectively; A horizontal adjustment member installed at the left and right sides of the track, and having a part of the body reciprocated up and down by a motor to level the track; A trolley installed to be transported on the track; Transport means for transporting the trolley; A known articulated robot installed on the trolley and moving up, down, front, back, left and right by having a plurality of axes; Inspection means installed in the articulated robot, the non-destructive inspection of the through-pipe nozzle and the through-pipe welding portion; And a controller for manipulating the horizontal adjusting member, the conveying means, the articulated robot, and the inspecting means. It is made of but is not a decontamination apparatus, but inspection system is different from the present invention.

The remote control guide system for a nuclear reactor head through-pipe repair robot, which is disclosed in Korean Patent No. 10-0834686, is formed to be inserted into an interior of a nuclear reactor head restraint, and includes at least one base, a horizontal guide rail installed on the base, and A horizontal guide including a reactor head restraint inner wall support for supporting an inner wall of the reactor head restraint; A robot fixing part for fixing a repair robot for repairing the reactor head through-tube, a bogie including a first driving device and configured to move on the horizontal guide rail by operation of the first driving device, and fixed to the bogie A vertical guide including a vertical transfer driver having a second driving device to move the robot fixing part in a vertical direction; And a control unit for controlling the operation of the first and the second drive device so that the position of the bogie and the robot fixing portion can be adjusted, but different from the present invention.

The radioactive contaminant decontamination apparatus disclosed in Korean Patent No. 10-0638400 includes a decontamination tank installed with a plurality of washing nozzles installed in an inner space communicating with the outside of the first shielding door, the plurality of washing nozzles being installed on an upper portion of the ultrasonic water submerging portion of the decontamination tank; A water supply pipe and a drain pipe installed in the decontamination tank for access of ultrasonic water and washing water; Decontamination tank support tank in which the decontamination tank can be seated; A lifting lever capable of vertically moving in an inner space of the decontamination tank, the lifting lever being detachable from the stain race rack; A stainless rack connected to the lifting lever and having a second shielding door; A hot air passage through which hot air from an external hot air fan for drying is supplied to one side of a wall of the salt bath; It is not a device that can put the reactor upper head to remove the structure or the inside of the reactor upper head contamination, and is completely different from the present invention.

The present invention for solving the above problems is the upper part of the reactor in order to prevent the progress of the probe (probe), damage and excessive exposure of the operator during the volumetric and surface inspection to confirm the integrity of the reactor upper head through-pipe A decontamination apparatus for removing radioactive material and boric acid and other fine particles attached to the through tube installed in the head and the upper head, comprising: a decontamination unit for spraying high pressure into the upper head and through tube of the reactor; A drive unit for rotating the decontamination unit; A body part installed at the upper part of the decontamination part, the driving part built-in, and coupled to another device; It consists of a utility supply line consisting of a pure water supply line for supplying pure water to the decontamination unit, and a compressed air line for supplying compressed air to the drive unit, the decontamination unit is the upper head in the upper head of the reactor to which the open housing type through tube is applied A Korean injection nozzle unit which decontaminates the inside and the through tube and decontaminates the inside of the upper head and the outside of the through tube in the upper part of the reactor to which a heat transfer buffer sleeve tube is applied; Decontamination inside the upper head of the reactor with a gap spray nozzle to spray and depressurize the gap between the thermal sleeve and the through tube in three directions at the upper head of the reactor to which the transfer sleeve of the transfer sleeve is applied. In providing a device.

The decontamination apparatus of the present invention, inside the upper head and upper reactor of the reactor in order to prevent the disturbance of the probe (probe), damage and excessive exposure of the operator during the volumetric and surface inspection to confirm the integrity of the upper head through-tube of the reactor A decontamination unit serving to remove radioactive material and boric acid and other fine particles attached to the through tube installed in the head, and to spray high pressure in the upper head and the through tube; A drive unit for rotating the decontamination unit; A body part installed at the upper part of the decontamination part, the driving part built-in, and coupled to another device; It is composed of a utility supply line consisting of a pure water supply line for supplying pure water to the decontamination unit, and a compressed air line for supplying compressed air to the drive unit, an installation stand may be further added.

The decontamination unit is a Korean type injection that depressurizes the inside of the upper head and the outside of the through tube of the reactor upper head to which the through tube of the open housing type is applied, or the upper head of the reactor upper head to which the through tube of the thermal sleeve type is applied. A nozzle unit; A gap sprinkling nozzle portion for desalting by spraying with high pressure in three directions in a gap between a heat transfer buffer sleeve and a through tube in a reactor upper head to which a heat transfer buffer through tube is applied; The cap sprinkling nozzle portion is centered on the fallopian tube of the through pipe to spray the high pressure in the gap, and after centering on the fallopian tube, the decontamination device is coupled to the volumetric inspection equipment and descends downward when vertically raised. A center cone part which causes the cap spray nozzle part to be retracted, descends the decontamination apparatus, and releases the contact with the fallopian tube to the original position to spread the cap spray nozzle part, and the Korean spray nozzle part is installed at the center; The lower portion of the center cone portion is installed inside, the gap spray nozzle portion is installed on the side, is fixedly installed on the body portion, the belt is rotated in combination with the drive portion, the inside is composed of a hollow and cylindrical central shaft portion.

The driving unit includes an air motor driven by compressed air, a timing belt for transmitting the rotational force of the air motor to the decontamination unit, and a timing pulley coupled to the rotation shaft of the air motor to transmit the rotational force to the timing belt.

The Korean spray nozzle part is composed of a spray nozzle having a constant spray angle, and a flexible tube coupled to the pure water supply line and the spray nozzle and preventing the pure water supply even when the center cone part moves up and down. It is preferable to have an injection angle of 30 to 45 degrees.

The gap spray nozzle unit and the spray nozzle is pure water spray; A flow arm coupled to the water spray nozzle and having a pure water supply line passing therein and surrounding or releasing the outside of the through pipe by vertical movement of the center cone part; It is coupled to the lower end of the flow arm, and is fixed to the central axis portion is configured to a cam device for lifting and retracting the flow arm by the vertical movement of the center cone portion.

The center cone part has a conical pillar-shaped center cone which serves to center the fallopian tube of the through pipe in order to spray the cap spray nozzle with a high pressure in the gap; A cone cylinder coupled to a lower portion of the center cone to move up and down inside the center shaft portion to operate the cam device to surround the flow tube with the flow arm; It is mounted on the lower portion of the cylinder to reduce the cone cylinder to be lowered when the load is raised by the decontamination device so that the lower portion of the cylinder to operate the cam device, the load is lowered by the decontamination device It is composed of a center cone spring which causes the flow cylinder to be lifted upward by the elastic force that increases as it decreases, thereby releasing the flow arm from the through tube by the weight of the flow arm.

The central shaft portion includes two bearings inserted into a bearing housing of the body portion so that the decontamination portion can be rotated smoothly, a timing gear for transmitting the rotational force of the timing belt of the drive portion to the decontamination portion, and the cam device. A cam device insertion hole to be inserted and a spring seating portion to which the center cone spring is seated are formed,

The body portion has a structure in which a central shaft portion coupling portion to which the central shaft portion is coupled, a bearing housing to which the bearing of the center shaft portion is coupled, and a fastening device to which the decontamination device is fastened to the volumetric inspection equipment and the mounting stand are formed.

The pure water supply line is divided into a spray nozzle pure water supply line going from the main line to the Korean injection nozzle unit and a spray water nozzle unit pure supply line going to the cap spray nozzle unit, and the main pure water supply line has an open housing type through tube applied thereto. In the upper head of the reactor, a three-way valve can be remotely controlled to block the spraying nozzle pure water supply line or to block the spray nozzle pure water supply line when decontaminating the gap between the heat transfer buffer sleeve and the through pipe. Is installed.

The compressed air line is a structure that is provided with a pressure control valve that can remotely adjust the pressure of the compressed air to change the rotational speed of the decontamination unit.

The above-mentioned decontamination apparatus inside the upper head of a nuclear reactor can solve the problem to be solved of the present invention.

According to the decontamination apparatus of the upper head of the reactor of the present invention by spraying or sprinkling in the gap between the inside of the upper head of the through tube of the open housing type or the thermal sleeve buffer type and the through tube or the heat transfer buffer sleeve and the through tube During the volumetric and surface inspection to check the integrity of the upper head through-tube of the reactor, it prevents the interfering and damage of the probe and enables effective and accurate inspection. When performing the liquid penetrant inspection (PT) It has the effect of reducing the radiation dose of workers and preventing the spread of radioactive contamination.

1 is a schematic diagram of each type of through tube
2 is a physical photograph of each type of the volumetric probe
Figure 3 is an overall perspective view of the decontamination apparatus inside the reactor upper head of the present invention
Figure 4 is a perspective view of the decontamination section according to the decontamination apparatus inside the reactor upper head of the present invention
Figure 5 is a perspective view of the center cone portion according to the upper head decontamination apparatus of the present invention
Figure 6 is a perspective view of the central axis according to the reactor upper head decontamination apparatus of the present invention
7 is a perspective view of a driving unit according to the decontamination apparatus inside the reactor upper head of the present invention
Figure 8 is a schematic view of the body portion according to the reactor upper head decontamination apparatus of the present invention
Figure 9 is a schematic view of the mounting stand according to the reactor upper head decontamination apparatus of the present invention
10 is a perspective view of the decontamination apparatus mounted on the volume inspection equipment according to the decontamination apparatus inside the reactor upper head of the present invention
11 is a perspective view of a decontamination apparatus mounted on an installation stand according to the reactor upper head decontamination apparatus of the present invention.
12 is a state diagram of the decontamination apparatus when spraying the gap with the gap watering nozzle unit according to the decontamination apparatus inside the reactor upper head of the present invention.
FIG. 13 is a diagram illustrating the operation of each stage when decontaminating a heat transfer buffer sleeve (Thrumal Sleeve) type through tube according to an internal decontamination apparatus of the reactor upper head of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

In addition, the terms to be described below are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users or operators, and the definitions thereof describe "a reactor upper head decontamination apparatus" according to the present invention. It should be made based on the contents throughout the specification.

Hereinafter, a preferred embodiment of the "reactor upper head internal decontamination apparatus" according to the present invention will be described in detail with reference to the drawings. The following examples are merely illustrative of the present invention and are not intended to limit the scope of the present invention.

Figure 1 is a schematic diagram of each type of through-pipe, Figure 2 is a physical picture of the type of the probe for the volume inspection, Figure 3 is an overall perspective view of the upper head decontamination apparatus of the present invention, Figure 4 is a reactor of the present invention 5 is a perspective view of a center decontamination unit according to the upper head decontamination apparatus of the present invention, and FIG. 6 is a perspective view of a center shaft according to the inner decontamination apparatus of the reactor upper head of the present invention. 7 is a perspective view of a driving unit according to the reactor upper head decontamination apparatus of the present invention, Figure 8 is a schematic view of the body portion according to the reactor upper head decontamination apparatus of the present invention, Figure 9 is a reactor upper head decontamination apparatus of the present invention 10 is a schematic view of the installation stand, and FIG. 10 is a perspective view of a decontamination apparatus mounted on the volume inspection equipment according to the decontamination apparatus inside the reactor upper head of the present invention. 11 is a moving perspective view of the decontamination apparatus mounted on the mounting stand according to the reactor upper head decontamination apparatus of the present invention, Figure 12 is a decontamination when spraying the gap with the gap spray nozzle unit according to the reactor upper head decontamination apparatus of the present invention Fig. 13 is a state diagram of the apparatus, and Fig. 13 is a state diagram of each step when decontaminating the heat transfer buffer sleeve (Thirmal Sleeve) type through tube according to the reactor upper head decontamination apparatus of the present invention.

As shown in FIG. 1, FIG. 1-1 is a through tube of an open housing type, and FIG. 1-2 is a through tube of a heat transfer buffer sleeve type.

The reactor head is hemispherical, and a plurality of control rod drive mechanisms (CDRMs) through which control rods are moved up and down are vertically fixed to the reactor head.

The upper head through tube of the reactor is divided into a through tube of open housing type and a through tube of thermal sleeve type.

In the case of through-tube volume inspection with heat transfer buffer sleeve, if the boric acid is hardened in the sleeve gap, the probe will not move smoothly, and the failure will occur. Enter and exit the head to remove the deposited boric acid, remove the stuck probe and replace if necessary.

In case of replacement of probe (probe, probe), inspection equipment failure, and liquid penetrant inspection (PT) inside the upper head of high pollution, high radiation area, exposure dose increases according to the frequency of operator's entrance Pollution may occur or the radioactive material may scatter and spread.

Therefore, using the remote control decontamination apparatus that can decontaminate the inside of the upper head of the reactor, the open housing type (Korean type) through tube is decontaminated by the high pressure injection of the inside of the reactor head, and the type of thermal sleeve The through tube can partially pressurize boric acid in the gap and spray the entire inside of the reactor head to reduce the radiation dose of workers and prevent the spread of radioactive contamination.

Figure 2 is a real picture of the probe (probe, probe) of the open housing type (Korean type) through-tube and the upper head uses the open-type volumetric probe as shown in the left picture of Figure 2, the open-type volumetric probe is cylindrical and mechanical Breakdown has the advantage that it does not happen very well.

The through tube 6b and the reactor upper head D of the type of heat transfer buffer sleeve (Thermal Sleeve) use a thin sleeve type volumetric probe as shown in the right picture of FIG.

In the reactor upper head (D) to which the heat transfer buffer sleeve (6b) is applied, a gap is inserted into the gap between the heat transfer buffer sleeve and the through tube. Only by decontaminating the inside can there be no problem with the use of thin sleeve type volumetric probe, and it can prevent progression and reduce breakage.

As shown in FIG. 3, the decontamination apparatus A of the present invention is a blockage of the probe during the volume inspection and the surface inspection to confirm the integrity of the reactor upper head through tube, damage, and excessive exposure of the operator. In order to prevent this, it serves to remove the radioactive material and boric acid and other fine particles attached to the through tube 6 installed in the upper head (D) and the upper head of the reactor.

Decontamination apparatus (A) of the present invention includes a decontamination unit (1) for spraying high pressure in the reactor upper head (D) and through pipe (6); A drive unit 2 for rotating the decontamination unit 1; A body part (3) having the decontamination part (1) installed on the upper part, the driving part (2) embedded therein, and coupled to another device; It is composed of a utility supply unit 4 consisting of a pure water supply line 41 for supplying pure water to the decontamination unit 1, and a compressed air line 42 for supplying compressed air to the drive unit (2). .

The decontamination apparatus (A) is a decontamination apparatus (A) for decontaminating the inside and through tube of the reactor upper head (D) to which the through tube (6a) of the open housing type without using the volume inspection equipment (B) is applied. It is preferable that the installation stand 5 is further configured to be installed.

The decontamination unit 1 is the upper head of the reactor upper head (D) to which the through tube 6a of the open housing type is applied or the upper head of the reactor upper head (D) to which the through tube 6b of the Thermal Sleeve buffer type is applied. Korean-type injection nozzle unit 11 for depressurizing and spraying the inside and the outside of the through-tube by high-pressure injection; Gap for desalination by high-pressure spraying in the gap 64 between the heat transfer buffer sleeve and the through tube in the reactor upper head D to which the heat transfer buffer through tube 6b is applied. A spray nozzle 12; The gap spray nozzle part 12 centers the fallopian tube 63 of the through tube 6 in order to spray high pressure in the gap 64, and the center of the fallopian tube 63, and then volumetric inspection When the decontamination apparatus (A) is coupled to the equipment (B) and rises vertically, the gap spray nozzle unit (12) is retracted and the decontamination apparatus (A) is lowered to lower the lower fallopian tube (63). A center cone part 13 which raises the gap water spray nozzle part 12 when the contact with the air is released, and the Korean spray nozzle part 11 is installed at the center thereof; The lower portion of the center cone portion 13 is installed inside, the gap spray nozzle portion 12 is installed on the side, is fixed to the body portion 3, is rotated by belt coupling with the drive unit (2) It is composed of a central shaft portion 14 that is hollow and cylindrical inside.

Connection terminals 415 and 422 are formed at ends of the pure water supply line 41 and the compressed air line 42 to be connected to a line drawn from the outside.

The pure water supply line 41 is a spray nozzle portion pure water supply line 412 to the Korean spray nozzle unit 11 from the main pure water supply line 411 and the spraying nozzle unit pure water to the gap spray nozzle unit 12 Divided into a supply line 413.

The main pure water supply line 411 blocks the water spray nozzle pure water supply line 413 or heat transfer buffer sleeve 62 in the reactor upper head D to which the through housing 6a of the open housing type is applied. When decontaminating the gap 64 between the through pipe 6b, a 3way valve 414 capable of remote control is preferably installed to block the injection nozzle pure water supply line 412. The 3way valve 414 is preferably installed outside the decontamination apparatus (A).

The 3 way valve 414 is installed in the reactor upper head (D) to which the through-pipe 6a of the open housing type is applied, so the gap spray nozzle part 12 does not need to be used, and thus the spraying nozzle part pure supply line ( To block the 413, and to block the injection nozzle unit pure water supply line 412 to the Korean injection nozzle unit 11 when the gap spray nozzle unit 12 is used to decontaminate the gap 64. When the decontamination apparatus A is not used, it may be completely blocked.

The compressed air line 42 has a structure in which a pressure control valve 421 that can remotely adjust the pressure of the compressed air to change the rotational speed of the decontamination unit 1 is installed.

As shown in FIG. 4, the decontamination unit 1 is a reactor to which an upper housing D of an open housing type through tube 6a is applied, or a reactor to which a through tube 6b of a thermal sleeve buffer type is applied. A Korean injection nozzle unit 11 for depressurizing and spraying the inside of the upper head of the upper head D and the outside of the through tube by high-pressure injection; Gap for desalination by high-pressure spraying in the gap 64 between the heat transfer buffer sleeve and the through tube in the reactor upper head D to which the heat transfer buffer through tube 6b is applied. A spray nozzle 12; The gap spray nozzle part 12 centers the fallopian tube 63 of the through tube 6 in order to spray high pressure in the gap 64, and the center of the fallopian tube 63, and then volumetric inspection When the decontamination apparatus (A) is coupled to the equipment (B) and rises vertically, the gap spray nozzle unit (12) is retracted and the decontamination apparatus (A) is lowered to lower the lower fallopian tube (63). A center cone part 13 which raises the gap water spray nozzle part 12 when the contact with the air is released, and the Korean spray nozzle part 11 is installed at the center thereof; The lower portion of the center cone portion 13 is installed inside, the gap spray nozzle portion 12 is installed on the side, is fixed to the body portion 3, is rotated by belt coupling with the drive unit (2) It is composed of a central shaft portion 14 that is hollow and cylindrical inside.

The Korean injection nozzle unit 11 is coupled to the injection nozzle 111 having a constant injection angle, the pure water supply line 41 and the injection nozzle 111, even when the center cone portion 13 moves up and down It consists of the flexible tube 112 which prevents this obstacle.

The spray nozzle 111 preferably has a spray angle of 45 ~ 60 °.

Preferably, the flexible tube 112 is made of a high pressure rubber material and extends as a spring as shown in the drawing, but when the center cone portion 13 descends on the central shaft portion 14, the flexible tube 112 decreases as a spring. There should be no blockage when using (11).

The gap spray nozzle unit 12 includes a spray nozzle 121 for pure water spraying; The spraying nozzle 121 is coupled to the upper end and the pure water supply line 41 passes through the inside, the flow arm for wrapping or releasing the outside of the through-pipe 6 by the vertical movement of the center cone portion 13 ( 122); It is coupled to the lower end of the flow arm 122, and is fixed to the central shaft portion 14 is composed of a cam device 123 to retract and move the flow arm 122 by the vertical movement of the center cone portion (13) .

High pressure spraying in the present invention is to shoot the pure water to spread widely at a certain angle, it is preferable to spray the high pressure water spraying so as not to spread because the cap is narrow by shooting so as not to spread the pure water.

As shown in FIG. 5, the center cone part 13 is configured such that the gap spray nozzle part 12 centers on the fallopian tube 63 of the through pipe 6 so as to spray high pressure into the gap 64. Role and the center of the fallopian tube (63) and then combined with the decontamination apparatus (A) to the volumetric inspection equipment (B) to descend to the bottom when the vertical spraying nozzle portion 12 to retract When the decontamination apparatus (A) is lowered to release the contact with the fallopian tube (63), it rises to its original position and spreads the gap spray nozzle unit (12), and the Korean spray nozzle unit (11) is installed at the center.

The center cone portion 13 is a cone-shaped center that serves to center the gap spray nozzle portion 12 to the fallopian tube 63 of the through pipe 6 in order to spray high pressure in the gap 64. Cone 131; Cone cylinder 132 is coupled to the lower portion of the center cone 131 to move up and down in the central shaft portion 14 to operate the cam device 123 so that the flow arm 122 surrounds the through pipe (6). )Wow; Is mounted on the lower portion of the cylinder cylinder 132 is reduced so that the cone cylinder 132 can be lowered when the load is lifted by the decontamination device (A) so that the lower portion of the cylinder cylinder 132 is the cam device ( 123 is operated, and the load is reduced by the lowering of the decontamination apparatus (A), the cone cylinder 132 is raised to the upper by the elastic force that is increased by the weight of the flow arm 122 by the flow arm 122 It is composed of a center cone spring 133 to be released from the through-tube.

The center cone 131 is provided with a spray nozzle coupler 1311 for installing the spray nozzle 111.

The inclination of the cone portion of the center cone 131 coincides with the inclination of the fallopian tube 63 to allow the center to be aligned with the fallopian tube 63 of the through tube 6.

The cone cylinder 132 should be hollow inside and closed at the bottom.

The lower portion of the center cone spring 133 is formed with a spring support 1331 is seated and coupled to the spring seating portion 144 of the central shaft portion (14).

As shown in FIG. 6, the central shaft portion 14 has a lower portion of the center cone portion 13 installed therein, the gap spray nozzle portion 12 is installed on a side surface thereof, It is fixedly installed, and rotates by belt coupling with the drive unit 2, the inside is hollow and cylindrical.

The central shaft portion 14 has two bearings 141 inserted into the bearing housing 32 of the body portion 3 so that the decontamination portion 1 can be smoothly rotated, and the driving portion 2. A timing gear 142 for transmitting the rotational force of the timing belt 22 to the decontamination unit 1, three cam device insertion holes 143 into which the cam device 123 is inserted, and the center cone spring ( A ring-shaped spring seat 144 on which the 133 is seated is formed.

As shown in FIG. 7, the drive unit 2 includes an air motor 21 driven by compressed air, a timing belt 22 which transmits the rotational force of the air motor 21 to the decontamination unit 1, and Is coupled to the rotating shaft of the air motor 21 is a structure consisting of a timing pulley 23 for transmitting a rotational force to the timing belt (22).

The compressed air line 42 is preferably provided with a pressure control valve 421 that can remotely adjust the pressure of the compressed air in order to change the rotational speed of the decontamination unit (1).

As shown in FIG. 8, the body part 3 includes the decontamination part 1 installed on the upper part, the driving part 2 embedded therein, and the volume inspection equipment B or the installation stand 5. Combined.

The body part 3 has a decontamination unit coupling hole 31 to which the decontamination unit 1 is coupled, a bearing housing 32 to which the bearing 141 of the central shaft portion 14 is coupled, and the decontamination apparatus ( Utility A through which the fastening device 33 which A) is fastened to the volume inspection equipment B and the installation stand 5, and the pure water supply line 41 and the compressed air line 42 of the utility supply part 4 pass. The line passing hole 35 and the driving unit coupling hole 34 to which the driving unit 2 is coupled are formed.

As shown in FIG. 9, the installation stand 5 does not need to use the volumetric inspection equipment B in the reactor upper head D to which the through housing 6a of the open housing type is applied. ) Can be used after tightening.

The mounting stand 5 is formed with a body fastener 51 for fastening with the fastening device 33 of the body portion 3.

10 is a reactor upper head (D) to which a through pipe 6b of a thermal sleeve buffer type (Thermal Sleeve) is applied while fastening the decontamination apparatus (A) of the present invention to the volumetric inspection equipment (B) while watching a CCTV camera (D). It shows the state of high pressure spray decontamination by the whole injection type inside the upper head and the outside of the through tube of the).

The inside of the gap 64 also adjusts the volumetric inspection equipment (B) to insert the center cone part 13 into the fallopian tube 63 to align the center, and then operate the gap spray nozzle part 12 to spray high pressure. Can be decontaminated.

FIG. 11 shows that the upper head D of the reactor housing 6 through pen pen type penetrating tube 6a is fastened to the mounting stand 5 without using the volume inspection equipment B, thereby allowing the upper head and the outer tube to penetrate. It shows the state of high pressure spray decontamination by the whole injection type.

FIG. 12 shows the inside of the gap 64 between the heat transfer buffer sleeve 62 and the through tube 6b in the reactor upper head D to which the heat transfer buffer through tube 6b is applied. The flow arm 122 is retracted when decontaminated by high pressure spraying in three directions so that the spray nozzle 121 is sprayed with high pressure along a through-hole 6b of a heat transfer buffer sleeve, and the inside of the gap 64. Is a perspective view showing the state of the device when decontamination in three directions.

FIG. 13 shows the inside of the gap 64 between the heat transfer buffer sleeve 62 and the through pipe 6b in the reactor upper head D to which the heat transfer buffer through tube 6b is applied. 1 is a step-by-step operation diagram when decontamination by high pressure spraying in three directions as shown in FIG. 1, the position of the through pipe 6b of the decontamination apparatus A fastened to the volume inspection equipment B using the volume inspection equipment B. FIG. Step 2 is to match the center cone 131 and the fallopian tube (63) of the decontamination apparatus (A) with the volumetric test equipment (B), 3 to 4 is the volumetric test equipment (B) The decontamination apparatus A is a step of raising the decontamination apparatus A, and 5 is a step in which the flow arm 122 is retracted by raising the decontamination apparatus A while the center cone 131 and the fallopian tube 63 are in contact with each other. , 6 ~ 7 is the flow arm 122 is completely retracted and rotated and sprayed with the spray nozzle (121) of the fraud gap spray nozzle unit 12 to remove the inside of the gap A phase diagram of the steps you can take.

According to the decontamination apparatus of the upper head of the reactor of the present invention by spraying or sprinkling in the gap between the inside of the upper head of the through tube of the open housing type or the thermal sleeve buffer type and the through tube or the heat transfer buffer sleeve and the through tube During the volumetric and surface inspection to check the integrity of the upper head through-tube of the reactor, it prevents the interfering and damage of the probe and enables effective and accurate inspection. When performing the liquid penetrant inspection (PT) It has the effect of reducing the radiation dose of workers and preventing the spread of radioactive contamination.

A: Decontamination device B: Volumetric inspection equipment
C: CCTV camera D: Reactor upper head
1: decontamination unit 11: Korean injection nozzle unit
111: injection nozzle 112: flexible tube
12: gap spray nozzle unit 121: spray nozzle
122: flow arm 123: cam device
13: center cone part 131: center cone
1311: injection nozzle coupler 132: cone cylinder
133: center cone spring 1331: spring support
14: central axis portion 141: bearing
142: timing gear 143: cam device insertion port
144: spring seat
2:
21: air motor 22: timing belt
23: timing pulley
3: body portion 31: decontamination fitting
32: bearing housing 321: bearing housing support frame
33: fastening device 34: drive coupling
35: Utility line through hole
4: utility supply part 41: pure water supply line
411: Main pure water supply line 412: Pure water injection line
413: Spraying nozzle part pure supply line 414: 3way valve
415: connection connector 42: compressed air line
421: Pressure regulating valve 422: Connection connector
5: mounting stand 51: body fasteners
6: through tube
6a: through tube of open housing type
6b: Heat transfer buffer sleeve tube
61: through-tube body 62: heat transfer buffer sleeve
63: fallopian tube 64: gap

Claims (5)

Pipes installed inside and in the upper part of the reactor upper head (D) to prevent disturbance of the probe, damage and excessive exposure of workers during the volumetric and surface inspection to confirm the integrity of the upper head through tube of the reactor. In the reactor upper head decontamination apparatus (A) for removing radioactive material, boric acid and fine particles attached to the clearance (6),
The decontamination apparatus (A) includes a decontamination unit (1) for spraying high pressure in the reactor upper head (D) and through pipe (6);
A drive unit 2 for rotating the decontamination unit 1;
A body part (3) having the decontamination part (1) installed on the upper part, the driving part (2) embedded therein, and coupled to another device;
It is composed of a utility supply unit 4 consisting of a pure water supply line 41 for supplying pure water to the decontamination unit 1, and a compressed air line 42 for supplying compressed air to the drive unit (2) ,
The decontamination unit 1 is the upper head of the reactor upper head (D) to which the through tube 6a of the open housing type is applied or the upper head of the reactor upper head (D) to which the through tube 6b of the Thermal Sleeve buffer type is applied. Korean injection nozzle unit 11 for decontamination by high-pressure spraying the inside and the outside of the through pipe (6a, 6b);
In the nuclear reactor upper head (D) to which the heat sleeve shock absorbing tube 6b is applied, the gap 64 between the heat transfer buffer sleeve 62 and the through pipe 6b in three directions. A gap spray nozzle unit 12 for spraying and decontaminating under high pressure;
The gap spray nozzle part 12 centers the fallopian tube 63 of the through tube 6 in order to spray high pressure in the gap 64, and the center of the fallopian tube 63, and then volumetric inspection When the decontamination apparatus (A) is coupled to the equipment (B) and rises vertically, the gap spray nozzle unit (12) is retracted and the decontamination apparatus (A) is lowered to lower the lower fallopian tube (63). A center cone part 13 which raises the gap water spray nozzle part 12 when the contact with the air is released, and the Korean spray nozzle part 11 is installed at the center thereof;
The lower portion of the center cone portion 13 is installed inside, the gap spray nozzle portion 12 is installed on the side, is fixed to the body portion 3, is rotated by belt coupling with the drive unit (2) , The inside is composed of a hollow and cylindrical central shaft portion 14,
The driving unit 2 is an air motor 21 driven by compressed air, a timing belt 22 that transmits the rotational force of the air motor 21 to the decontamination unit 1, and a rotation shaft of the air motor 21. A decontamination apparatus inside the upper head of the reactor having a structure consisting of a timing pulley (23) coupled to and transmitting rotational force to the timing belt (22).
The method of claim 1,
The decontamination apparatus (A) is a decontamination apparatus (A) for decontaminating the inside and through tube of the reactor upper head (D) to which the through tube (6a) of the open housing type without using the volume inspection equipment (B) is applied. Decontamination apparatus inside the upper head of the reactor, characterized in that the installation stand (5) is further configured to be installed
The method of claim 2,
The Korean injection nozzle unit 11 is coupled to the injection nozzle 111 having a constant injection angle, the pure water supply line 41 and the injection nozzle 111, even when the center cone portion 13 moves up and down It is composed of a flexible tube 112 to avoid this obstacle,
The gap spray nozzle unit 12 includes a spray nozzle 121 for pure water spraying;
The spraying nozzle 121 is coupled to the upper end and the pure water supply line 41 passes through the inside, the flow arm for wrapping or releasing the outside of the through-pipe 6 by the vertical movement of the center cone portion 13 ( 122);
It is coupled to the lower end of the flow arm 122, and is fixed to the central shaft portion 14 is composed of a cam device 123 to retract and move the flow arm 122 by the vertical movement of the center cone portion 13 ,
The center cone portion 13 is a cone-shaped center that serves to center the gap spray nozzle portion 12 to the fallopian tube 63 of the through pipe 6 in order to spray high pressure in the gap 64. Cone 131;
Cone cylinder 132 is coupled to the lower portion of the center cone 131 to move up and down in the central shaft portion 14 to operate the cam device 123 so that the flow arm 122 surrounds the through pipe (6). )Wow;
Is mounted on the lower portion of the cylinder cylinder 132 is reduced so that the cone cylinder 132 can be lowered when the load is lifted by the decontamination device (A) so that the lower portion of the cylinder cylinder 132 is the cam device ( 123 is operated, and the load is reduced by the lowering of the decontamination apparatus (A), the cone cylinder 132 is raised to the upper by the elastic force that is increased by the weight of the flow arm 122 by the flow arm 122 Consists of the center cone spring 133 to be released from the through-pipe,
The central shaft portion 14 has two bearings 141 inserted into the bearing housing 32 of the body portion 3 so that the decontamination portion 1 can be smoothly rotated, and the driving portion 2. A timing gear 142 for transmitting the rotational force of the timing belt 22 to the decontamination unit 1, a cam device insertion hole 143 into which the cam device 123 is inserted, and the center cone spring 133. A spring seating portion 144 to be seated is formed,
The body part 3 has a decontamination unit coupling hole 31 to which the decontamination unit 1 is coupled, a bearing housing 32 to which the bearing 141 of the central shaft portion 14 is coupled, and the decontamination apparatus ( A) is a decontamination apparatus inside the upper head of the reactor, characterized in that the fastening device 33 is fastened to the volume inspection equipment (B) and the mounting stand (5) is formed
The method of claim 3, wherein
The spray nozzle 111 is a decontamination apparatus inside the upper head of the reactor, characterized in that having an injection angle of 45 ~ 60 °
The method of claim 1,
Connection terminals 415 and 422 are formed at ends of the pure water supply line 41 and the compressed air line 42 so as to be connected to a line drawn from the outside.
The pure water supply line 41 is a spray nozzle portion pure water supply line 412 to the Korean spray nozzle unit 11 from the main pure water supply line 411 and the spraying nozzle unit pure water to the gap spray nozzle unit 12 Divided into a supply line 413,
The main pure water supply line 411 blocks the water spray nozzle pure water supply line 413 or heat transfer buffer sleeve 62 in the reactor upper head D to which the through housing 6a of the open housing type is applied. And when decontaminating in the gap 64 between the through pipe 6b is provided with a three-way valve 414 that can be remotely controlled to block the injection nozzle pure water supply line 412,
The compressed air line 42 has a structure in which a pressure control valve 421 is provided to remotely adjust the pressure of the compressed air in order to change the rotational speed of the decontamination unit 1. Decontamination device

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