KR100294167B1 - Apparatus for remote slitting of spent nuclear fuel rods - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spent nuclear fuel rod remote cutting device, the purpose of which is to easily separate the spent fuel rod cladding and spent fuel, and to limit the space within a limited space, such as a hot cell, to handle high radioactive material. To provide a modular fuel rod remote cutting device for remote operation by a master / slave manipulator.

The present invention relates to a remote cutting device installed in a hot cell for cutting a spent fuel rod in a longitudinal direction by a master / slave manipulator; It is installed on the upper side of the bearing housing, the spent fuel rod injection portion of the funnel shape in which the spent fuel rod is injected, and is installed to be located below the spent fuel rod injection portion, and has a predetermined depth in the circumferential direction in the middle portion. A knurled roller portion having a guide formed therein, a cut portion installed at a lower portion of the knurled roller portion to cut a spent fuel rod in a longitudinal direction, a power portion installed to be connected to the knurled roller portion and the cut portion, the power portion and A master / slave manipulator comprising a bearing housing installed at an upper part and including a cover tube of spent fuel rods separated by a cutting part, a collecting part for collecting spent fuel, and a fixing part for fixing the power part to the collecting part. To provide a spent fuel rod remote cutting device remotely operated by.

Description

Apparatus for remote slitting of spent nuclear fuel rods}

The present invention relates to a spent fuel rod remote cutting device, a hot cell for treating a high radioactive material in order to obtain a spent fuel required for fuel rod manufacturing (DUPIC: Direct Use of PWR spent fuel In CANDU) The present invention relates to a spent fuel rod remote cutting device that separates spent fuel rods burned by remote operation by a master / slave manipulator into a sheath of spent fuel rods and spent fuel.

Combusted light-water reactor spent fuel used as raw material for DUPIC fuel is a highly radioactive material and is stored in special shielding facilities. Since it cannot be handled directly by the operator, it should be handled in consideration of the risk of worker's radiation exposure and safety of work. As a result, the manufacture of DUPIC fuels must be handled remotely using remote control devices, manipulators, and handling tools in hot cells, specially shielded specialty facilities, as they must handle spent fuel in light water. After cutting the spent fuel rods into a fixed length from the hot cell with light water, and then separating the spent fuel rod cladding and the fuel, the separated spent fuel is powdered, and the powder is pulverized and mixed. Then reused as DUPIC fuel.

Conventionally, in order to separate the spent fuel rod cladding tube and the spent fuel rod made of Zircloy-4 material as the first step to obtain the spent fuel powder, the spent fuel is separated by dissolving the cladding tube using a chemical solvent. Alternatively, the spent fuel rods are shortly cut in the horizontal direction, dissolved in nitric acid solution to separate the nitric acid solution from the coated tube, or a hole is formed in the spent fuel rod using a laser to shake off the spent fuel in the coated tube. Using a die and a piston, the cladding and spent fuel were separated by compression, or the cladding dimensions were extended radially with respect to the spent fuel and the cladding and spent fuel were separated by a forced force.

However, since the separation of the spent fuel rod cladding and the spent fuel is performed by remote operation in a limited space of a hot cell, the chemical method reduces the process efficiency, and the mechanical and chemical bonding methods increase the contamination. Let's do it. In addition, mechanical methods such as crimping or expanding are difficult to install in a hot cell because they use a hydraulic device to utilize a large force, and are difficult to maintain due to leakage of oil. In addition, when using a laser, a laser installation space is required separately, and the economic burden is increased due to the expensive installation cost, and a lot of working time is required because a lot of holes are formed in the spent fuel rod by the laser, thereby resulting in efficient work. This was degraded.

In addition, all the structures and parts of the cladding pipe of the spent fuel rod and the machinery used to separate the spent fuel are integrally fastened by bolts and nuts, which makes remote operation by a manipulator or a handling tool difficult in a hot cell. In case of abnormality in the machinery during operation, the operator must wear special equipment and enter the hot cell directly to repair and replace the parts within a limited time, but the safety of the operator cannot be guaranteed due to the inherent high radioactivity of the spent fuel. There have been a number of problems, such as the maintenance and repair of machinery within the machine becomes almost impossible.

The present invention has been made in view of the above problems, and an object thereof is to easily separate the spent fuel rod cladding tube and the spent fuel, and the master / slave manipulator in a limited space such as a hot cell that handles high radioactive material. The present invention provides a modular fuel rod remote cutting device for remote operation.

The present invention is installed on the upper side of the bearing housing, the spent fuel rod injection portion of the funnel shape in which the spent fuel rod is injected, and is installed to be located below the spent fuel rod injection portion, the middle portion at a constant depth in the circumferential direction A knurled roller portion having a guide having a guide portion, a cut portion installed to be positioned below the knurled roller portion to cut a spent fuel rod in a longitudinal direction, and a power portion installed to be connected to the knurled roller portion and the cut portion; Master / slave is provided with a power unit and a bearing housing installed on the upper part, including a cover tube of spent fuel rods separated by a cutting unit, a collecting unit for collecting spent fuel, and a fixing unit for fixing the power unit to the collecting unit. The present invention provides a spent fuel rod remote cutting device remotely operated by a manipulator.

1 is a front view showing the configuration according to the present invention

Figure 2 is a side view showing a configuration according to the present invention

3 is a cross-sectional view taken along the line A-A of FIG.

Figure 4 is an exemplary installation example of a cutter showing a configuration according to the present invention

Figure 5 is an exemplary slide bottom view showing a configuration according to the present invention

Figure 6 is a plan view of a fixed guide showing a configuration according to the present invention

* Explanation of symbols for the main parts of the drawings

(1): spent nuclear fuel (2): nuclear fuel injection

(3): Knurled Roller Section (4): Cutting Section

(5): power unit (6): collector

(7): fixing part (8): bearing housing

21: injection part inlet 22: injection part outlet

(31): drive roller (32): driven roller

(33): power transmission shaft (34): guide

(41): driven cutting roller (42): driven cutting roller

43: cutter 44: spur gear

(45): Chain (46): Cutting Roller Cap

(51): rotary shaft 61: collector housing

(62): retractable door 63: collection box

(64): Handle (65): Lock

66: Recruitment 71: Slide

(72): Fixed guide (73): Fastening bar

711: first inserting portion 712: second inserting portion

713: third insertion portion 714: bearing

(715): Guide Hall (716): Hall

717: fastening hole 721: first support portion

722: second support 723: first guard

724: second guard 725: fastening hole

(726): Hall (727): Guide Hall

(731): head

1 is a front view showing a configuration according to the invention, Figure 2 is a side view showing a configuration according to the invention, Figure 3 is a cross-sectional view of the AA line of Figure 2, the present invention is used A spent fuel rod injection unit 2 into which the post-fuel fuel rod 1 is injected, a knurled roller unit 3 which guides and transports the spent fuel rod injected into the injection unit 2 downward; A cutting part 4 for cutting the spent fuel rod guided by the knurling roller part 3 in the longitudinal direction, a power part 5 for operating the roller part 3 and the cutting part 4, and the cutting part ( It consists of a cover tube of spent fuel rods separated by 4), a collection section 6 for collecting spent fuel, and a fixing section 7 for fixing the power section 5 to the collection section housing 61. .

The spent fuel rod injecting part 2 is a place where the spent fuel rods 1 cut to a predetermined length are injected, and a funnel-shaped inlet 21 is provided on the bearing housing 8 and an outlet 22 is provided on the lower portion thereof. ) Is installed to locate.

The knurled roller portion 3 transfers and guides the spent fuel rod injected into the spent fuel rod injection portion 2 to the cutting portion 4, and transmits the driving force of the power portion 5 to the power transmission shaft 33. It consists of a drive roller (31) directly transmitted by the drive roller 32, the driven roller (32) having the same height as the drive roller (31) and installed in close proximity. In the middle portions of the driving roller 31 and the driven roller 32, guides 34 having a predetermined depth in the circumferential direction are formed, respectively.

That is, when the spent fuel rod 1 is inserted between the guide 34 of the driving roller 31 and the guide 34 of the driven roller 32, the driving roller operated by the driving force of the power unit 5 ( 31) the spent fuel rod (1) is transported downwards. At this time, the driven roller 32 is rotated in the opposite direction to the driving roller 31 by the spent fuel rod (1) to be inserted to facilitate the transfer of the spent fuel rod (1).

The cutting portion 4 is to cut the spent fuel rods conveyed by the knurling roller portion 3 in the longitudinal direction, the chain 45 to drive the driving force of the power portion 5 transmitted by the power transmission shaft 33. The driving cutting roller 41 and the driven cutting roller 42 receives the driving force of the power unit 5 transmitted by the chain 45 by the spur gear 44. The driving cutting roller 41 and the driven cutting roller 42 have the same height and are installed in close proximity to each other, and end portions of the driving cutting roller 41 and the driven cutting roller 42 are shown in FIG. 4. The cutter 43 is provided by the cutting roller cap 46.

That is, the injection part 2, the knurled roller part 3 and the cutting roller part 4 are sequentially installed so that the spent fuel rod has a straight line and is transported and cut, and the guide of the knurled roller part 3 is provided. 34 and the cutter 43 of the cutting part 4 are formed and provided so that it may be located in the same plane.

The power unit 5 operates the knurling roller unit 3 and the cutting unit 4, and the rotation shaft 51 of the power unit 5 is coupled to the power transmission shaft 33, and the collection unit housing ( It is fixed by the fixing | fixed part 7 so that separation and joining are easy to 61).

The fixing part 7 is to fix the power unit 5 to the collector housing 61, as shown in FIGS. 5 and 6, the slide 71 to which the power unit 5 is fixed, and the collecting unit It consists of a fixing guide (72) fixed to the housing (61), and a fastening rod (73) for fastening the slide (71) and the fixing guide (72).

The slide 71 is connected to the power unit 5, and the first, second, third insertion parts 711, 712, 713 are installed in parallel with each other, and the first and second insertion parts 711, 712 face each other. A plurality of bearings 714 are installed at one side, and a guide tube 715 connected to a hole 716 formed at each of the third inserting parts 713 is installed at one side of the third inserting part 713. A fastening hole 717 having a screw thread is formed at one side of the insertion portion 711.

The fixing guide 72 is installed in the collecting part housing 61 to fix the slide 71 by the fastening rod 73, and the second support part 722 is inserted between the second and third inserting parts 712 and 713. Is installed, and the first support part 721 is installed to contact the side surface of the first insertion part 711 of the slide 71 in which the bearing 714 is not installed, and both ends of the first and second support parts 721 and 722 are provided. First and second guards 723 and 724 having different heights are provided to prevent over-entry or over-separation of the slide 71. In addition, a fastening hole 725 is formed in the second support part 722 so as to correspond to the hole 716 formed in the third insertion part 713, and a first support part 721 on one side of the first support part 721. The guide pipe 727 is connected to the hole 726 formed in the.

The hole 726 and the guide tube 727 of the first support portion have the same center line as the fastening hole 717 formed in the first insertion portion 711, and the hole 716 and the guide tube 715 of the third insertion portion. ) Has the same center line as the fastening hole 725 formed in the second support portion 722.

The fastening bar 73 is to fasten the slide 71 and the fixing guide 72, a screw portion (not shown) is formed on one side, the head 731 of the hexagon is formed on the other side. That is, the fastening rods 73 are inserted along the guide tube 715 of the slide 71 and the guide tube 727 of the fixed guide 72 so that the second support portion 722 and the slide ( Screws (not shown) are fastened to the fastening holes 717 and 725 formed in the first insertion portion 711 of the 71 to fix the slide 71 to which the power unit 5 is connected and installed to the fixing guide 72. .

The collecting part 6 collects spent fuel rods cut by the cutting part 4, in which a bearing housing 8 and a fixing part 7 are installed at an upper side thereof, and an openable door 62 is installed at one side thereof. It consists of a collector housing 61 and a collector 63 slidingly inserted into the collector housing 61. A plurality of handles 64 and a locking device 65 protrude from one side of the retractable door 62 and the collection box 63 of the collecting unit housing 61 to allow remote operation by a master / slave manipulator. It is.

In addition, a funnel-shaped recruitment portion 66 is provided between the collecting portion housing 61 and the cutting portion 4 to prevent scattering of the used spent fuel during cutting of the spent fuel rod by the cutting portion 4, It is to be inserted and stored in a predetermined position of the spent fuel rod storage and spent fuel collection (63). That is, the upper portion of the recruitment portion 66 is installed in a 'ω' shape so as to be close to the outer circumferential surfaces of the driving cutting roller 41 and the driven cutting roller 42 of the cutting portion 4, and after use by the cutting portion 4 Prevents spent fuel from scattering when cutting fuel rods.

When using the present invention configured as described above to remotely cut the spent fuel rods in the longitudinal direction using a master / slave manipulator in a hot cell, first dismantle the spent fuel assembly with a hard water stored in a special shielding facility. After disassembling, take out the spent fuel rods needed for manufacturing DUPIC fuel rods, cut them to a certain length, seal them with encapsulated spent fuel rods, load them in a transport container, and transport them to a hot cell.

When the spent fuel rod transported into the hot cell is remotely gripped by the master / slave manipulator and inserted into the injection portion, the spent fuel rod is transferred to the cutting portion with a straight line by a knurled roller part operated by the power unit. The conveyed spent fuel rod is cut longitudinally by the cutting portion and then inserted into the collecting vessel installed in the collecting housing through the collecting portion.

When the cutting operation of the spent fuel rod is finished, the power unit is stopped, the door of the collecting unit housing is opened by remote operation using a master / slave manipulator, the collecting box is taken out, and then transferred to the next step.

Thus, the present invention is to cut the spent fuel rods in the longitudinal direction to facilitate the separation of the spent fuel rod cladding and the spent fuel, and the parts can be used in a limited space, such as a hot cell by simple and modularized, Since the handle is formed to protrude on each part, all operations can be performed by remote operation using a master / slave manipulator.

Claims (5)

A remote cutting device installed in a hot cell, the remote cutting device for longitudinally cutting spent fuel rods by remote operation by a master / slave manipulator; The remote cutting device is installed on one side of the bearing housing, the spent fuel rod injection portion of the funnel shape is injected spent fuel rod, A knurled roller part installed at a lower portion of the spent fuel rod injection part and having a guide having a predetermined depth in a circumferential direction at an intermediate part thereof; A cutting part installed to be positioned below the knurling roller part to cut the spent fuel rod in a longitudinal direction; A power unit installed to be connected to the knurled roller part and the cutting part; A collection part in which the power part and the bearing housing are installed on the upper part, and used fuel rods cut by the cutting part are collected; A spent fuel rod remote cutting device, characterized in that it comprises a fixing part for fixing the power unit to the collection. The method of claim 1; The knurled roller portion is a remote control device for the spent fuel rods, characterized in that consisting of a drive roller that is directly transmitted by the power transmission shaft driving force of the power unit, and a driven roller having the same height as the drive roller and installed close to each other. The method of claim 1; The cutting unit is a driving cutting roller that receives the driving force of the power unit transmitted by the power transmission shaft, and the driving force of the power unit installed and provided with the same height as the driving cutting roller and transmitted by the chain by spur gears. A spent fuel rod remote cutting device comprising a driven cutting roller and a cutter installed by a cutting roller cap at an end of the driven cutting roller and the driven cutting roller. The method of any one of claims 1 to 3; The fuel injection rod remote cutting device, characterized in that the lower portion of the injection portion and the guide of the knurled roller and the cutter of the cutting portion is installed on the same plane. The method of claim 1; The fixing part is fixed to the power unit is installed in the upper portion, the first, second and third insertion portions are installed in parallel to each other, a plurality of bearings are installed on one side of the first and second insertion portions facing each other, the third insertion A slide having a plurality of guide pipes connected to holes formed in the third inserting portion at one side thereof, and a fastening hole having a screw thread formed at one side of the first inserting portion; A second support part is installed to be inserted between the second and third insertion parts of the slide, and a first support part is installed to contact the side of the first insertion part of the slide without bearings, and both ends of the first and second support parts are provided. A plurality of fastening holes are formed in the second support part to correspond to the holes formed in the third insertion part, and the holes and the guide tube having the same center line on one side of the first support part are installed at the same time. Formed guides, The screw is fastened to the fastening hole of the fixed guide and the slide is formed on one side end, and consists of a fastening rod formed with a hexagonal head portion on the other end, the slide with the fixed power unit is installed remotely by the master / slave manipulator A spent fuel rod remote cutting device, characterized in that separated from the fixed guide by the operation.