Heavy water reactor core flux detector mounting device and mounting method

Abstract

The invention belongs to the technical field of heavy water reactor core flux detectors, and aims to solve the problems that the manual flux detector installation speed is low, the personnel irradiation dose is high, and the detector is easy to damage. The invention discloses a heavy water reactor core flux detector installation device and method, the device comprises a front guide pipe and a rear guide pipe which are coaxially arranged, the rear end of the front guide pipe is installed at a reserved installation position of a driving system shell, and a driving pair wheel set is arranged between the front guide pipe and the rear guide pipe; the driving pair wheel set is in transmission connection with the driving motor; the rear guide pipe is in butt joint with a detector reel bin, a reel is installed in the detector reel bin, the tail of the flux detector is clamped into the reel, and a flux detector cable is wound on the reel. According to the method, components of the device are used for installing the device, the heavy water reactor core flux detector installation device is removed, and flux detector installation is completed. The installation speed of the flux detector can be increased, the radiation dose of personnel is reduced, and the probability that the detector is prone to damage is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of heavy water reactor core flux detectors, and in particular, relates to a heavy water reactor core flux detector installation device and installation method. Background Art

[0002] The CANDU6 heavy water reactor uses 188 self-powered detectors as detection instruments for the neutron flux density in various areas of the nuclear reactor core. It can achieve accurate and rapid measurement and spatial calibration in the high power range, and provide signals for the first shutdown system, the second shutdown system and the reactor power regulation system.

[0003] 188 self-powered core flux detectors are inserted into the reactor core through 26 vertical neutron flux measurement assemblies and 7 horizontal vertical neutron flux measurement assemblies. The vertical neutron flux measurement assemblies and the horizontal neutron flux measurement assemblies have the same structure. Each assembly contains 12 capillary detector tubes. Each capillary tube has an inner diameter of 3.4mm and a length of about 13m, which runs through the core in a spiral shape. The flux detector has a diameter of about 3mm and a length of about 90mm. The flux detector is connected to the tail of the cable, which has a diameter of about 1mm and a length of about 12m. The detector and cable enter the core by inserting all the capillaries of the flux measurement assembly.

[0004] The CANDU6 heavy water reactor carries out flux detector maintenance every two years and replaces all of them every ten years. The irradiation dose rate in the core flux detector installation area is high, and detector replacement is a high-risk operation for radiation protection. The flux detector is thin and long, easy to bend, and the new flux detector needs to be inserted slowly along the capillary mouth manually. In addition, the on-site installation space is small, and it takes dozens of minutes to install each flux detector. The replacement of a large number of flux detectors requires several operators to take turns to share the work intensity and personal radiation dose. Summary of the invention

[0005] The purpose of the present application is to provide a heavy water reactor core flux detector installation device and installation method to solve the problems of slow manual installation of flux detectors, high radiation dose for personnel, and easy damage to the detectors.

[0006] In order to achieve the above objectives, this application provides the following technical solutions:

[0007] In the first aspect, the present application provides a heavy water reactor core flux detector installation device, comprising a coaxially arranged front guide tube and a rear guide tube, the rear end of the front guide tube is installed in a reserved installation position of a drive system housing, a driving wheel pair is arranged between the front guide tube and the rear guide tube, and the driving wheel pair is connected to a driving motor in a driving manner; the rear guide tube is connected to a detector reel bin, a reel is installed in the detector reel bin, the tail of the flux detector is inserted into the reel, and the flux detector cable is wound on the reel.

[0008] In some embodiments, the front guide tube is a flexible conical tube, the front end of which is docked with the capillary port of the flux detector assembly, and the rear end is arranged in front of the driving wheel pair.

[0009] In some embodiments, the rear end of the flexible conical tube is a bell-shaped structure.

[0010] In some embodiments, a locking nut is provided at the front end of the front guide tube, and the front guide tube is fixed to the capillary of the flux detector assembly by the locking nut. A quick connector is provided at the rear end of the front guide tube, and the quick connector is connected to the device body.

[0011] In some embodiments, the front guide tube is a bellows, the side wall of the bellows is slit, and a slit nut is provided outside the tube wall.

[0012] In some embodiments, an extension tube is provided in the middle portion of the front guide tube.

[0013] In some embodiments, the rear guide tube is a rigid circular tube with bell mouths at both ends.

[0014] In some embodiments, the rear guide tube is installed in a slot of the device body, the front end of the rear guide tube is arranged behind the driving wheel set, and the rear end of the rear guide tube is connected to the detector reel bin.

[0015] In some embodiments, a slit is formed on the side wall of the rear guide tube, and a sliding door is provided outside the slit.

[0016] In some embodiments, the reel is mounted on the shaft of the detector reel bin, and the flux detector is wound on the reel.

[0017] In some embodiments, a guide groove is provided in the detector reel bin to guide the flux detector to smoothly enter the rear guide tube.

[0018] In some embodiments, the door of the detector reel bin is a hollow structure.

[0019] In some embodiments, the driving wheel set includes a front-drive wheel set and a rear-drive wheel set, and each wheel set includes two rubber rollers.

[0020] In some embodiments, the upper rubber roller of the driving pair of wheels is arranged to be able to move in the vertical direction, and is pressed against the lower rubber roller below by a spring, and the lower rubber roller is driven by the driving motor; the lower rubber roller serves as a driving wheel, and the upper rubber roller serves as a driven wheel. The two upper rubber rollers rotate towards each other under the drive of the two lower rubber rollers, and the front-drive pair of wheels and the rear-drive pair of wheels clamp the flux detector cable and rotate synchronously to realize the insertion or lifting of the flux detector.

[0021] In some embodiments, the driving motor is a servo motor, which is connected to the main shaft of the pair of wheel assemblies through a reducer and gears.

[0022] In some embodiments, the device further comprises a control box, which comprises a PLC, a motion controller, and a power module, and the movement mode of the servo motor and the speed and position of the flux detector insertion are controlled by the PLC program.

[0023] In some embodiments, the device also includes a control screen, which provides an operator with a control instruction sending interface and real-time feedback information through a graphical human-computer interaction interface.

[0024] In some embodiments, the device further includes a drive system housing, the rear guide tube is disposed within the drive system housing, and the detector reel bin is docked with the drive system housing.

[0025] In a second aspect, the present application provides a method for installing a heavy water reactor core flux detector, comprising:

[0026] Step 1: Install the flux detector cable into the reel;

[0027] Step 2: Connect the front guide tube to the capillary of the flux detector assembly and lock it;

[0028] Step 3: Check the driving wheel assembly, the detector reel bin, and the rear guide pipe;

[0029] Step 4: According to the installation position of the flux detector in the reactor, set the installation position and speed parameters on the control panel;

[0030] Step 5: inserting the end of the flux detector into the front guide tube, holding the flux detector cable to send the flux detector through the front guide tube into the capillary of the flux detector assembly;

[0031] Step 6: Install the reel into the detector reel bin;

[0032] Step 7: Connect the front guide tube to the device body and fix the heavy water reactor core flux detector installation device in the operating position;

[0033] Step 8: Start the control system and install the flux detector;

[0034] Step 9: Release the heavy water reactor core flux detector installation device to complete the flux detector installation.

[0035] Compared with the prior art, the heavy water reactor core flux detector installation device and installation method provided by the present application have the following beneficial effects:

[0036] The heavy water reactor core flux detector installation device provided in the present application can speed up the installation of the flux detector, reduce the radiation dose of personnel, and alleviate the susceptibility of the detector to damage.

[0037] The operator remotely controls the device of the present invention through a handheld control panel, uses the driving wheel set to simulate the action of manually inserting the detector, and uses the mechanical device to quickly and smoothly insert the more than ten-meter-long cable and flux detector into the specified position of the reactor core.

[0038] The present application reduces the number of operators from 4 to 2, and reduces the time for inserting a single detector from 20 minutes to 5 minutes. At the same time, the radiation dose of the operators and the damage rate of the detectors are reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for the technical description.

[0040] Figure 1 A schematic diagram of the structure of the heavy water reactor core flux detector installation device provided in this application;

[0041] Figure 2 A flow chart of a method for installing a heavy water reactor core flux detector provided in this application.

[0042] Description of reference numerals:

[0043] 1. Front guide tube; 2. Driving wheel set; 3. Driving motor; 4. Driving system housing; 5. Rear guide tube; 6. Detector reel bin; 7. Reel; 8. Control panel. DETAILED DESCRIPTION

[0044] The following is further explained in detail through specific implementation methods.

[0045] like Figure 1As shown, the present application provides a heavy water reactor core flux detector installation device, including a guidance system, a driving system and a control system, the guidance system includes a front guide tube 1, a rear guide tube 5 and a detector reel bin 6, the driving system includes a driving wheel pair 2 and a driving motor 3, the control system includes a control box and a control panel 8, and the driving wheel pair 2 includes a front drive wheel pair and a rear drive wheel pair.

[0046] The front guide tube 1 is a flexible conical tube, the front end of which is aligned with the capillary port of the flux detector assembly, and then the capillary tubes of the remaining flux detector assemblies are connected and fixed by tightening the nut, and the rear end of the flexible conical tube is in a flared shape close to the front drive wheel set. The front guide tube 1 is installed on the female quick connector of the drive system housing 4 to guide the flux detector wound on the reel 7 to smoothly enter the capillary of the flux detector assembly.

[0047] A locking nut is provided at the front end of the front guide tube 1, and the front guide tube 1 is fixed to the capillary of the flux detector assembly through the locking nut. A quick connector male is provided at the rear end of the front guide tube 1, and the quick connector male is connected to the quick connector female of the drive system housing 4.

[0048] In one embodiment, the front guide tube 1 is a corrugated tube, and the bending angle can be flexibly adjusted within the range of 0-90 degrees. The side wall of the tube is slit, and the flux detector cable can be taken out through the slit of the tube wall. A slit nut is provided outside the tube wall. When inserting the flux detector, the slit nut is rotated so that the closed end of the slit nut overlaps with the opening of the tube wall to prevent the detector cable from accidentally slipping out. When detaching, the opening of the nut overlaps with the opening of the tube wall to facilitate the removal of the flux detector cable.

[0049] Optionally, an extension tube is provided in the middle of the front guide tube 1 , and the extension tube connects the left and right sections of the front guide tube 1 .

[0050] The rear guide tube 5 is a rigid round tube with flared ends, which is installed in the card slot of the device body. The front end of the rear guide tube 5 is close to the rear drive wheel set, close to but not in contact with the rear drive wheel set, and the rear end is docked with the detector reel bin 6. The flared ends facilitate the entry and exit of the flux detector. The side wall of the rear guide tube 5 is slit for the disassembly and assembly of the flux detector cable. A sliding door is provided outside the wall slit to prevent the flux detector cable from slipping out.

[0051] The detector reel bin 6 is a square flat box with a shaft in the middle. The detector reel (reel 7) is installed on the shaft. The detector reel reels the flux detector. The detector reel bin 6 is docked with the detector reel bin 6 and the drive system housing 4. When the flux detector is pulled, the reel 7 rotates accordingly to transport the flux detector and its cable.

[0052] The opening of the detector reel bin 6 is aligned and close to the opening of the rear guide tube 5, and a guide groove is provided in the bin. The opening of the guide groove of the detector reel bin 6 is aligned and close to the opening of the rear guide tube 5, so as to guide the flux detector to smoothly enter the rear guide tube 5. The detector reel bin 6 is provided with a fixed card slot, and the drive system housing 4 is connected to the fixed card slot and fixed with a pin.

[0053] In one embodiment, the door of the detector reel compartment 6 is hollowed out so that the rotation of the reel 7 can be observed.

[0054] A reel 7 is installed in the detector reel bin 6 . The reel 7 has a limiting groove. The tail of the flux detector is inserted into the limiting groove of the reel 7 . The reel 7 is rotated to reel the flux detector cable onto the reel 7 .

[0055] The driving wheel set 2 includes a front-drive wheel set and a rear-drive wheel set, and each wheel set includes two rubber rollers. The rubber rollers are installed inside the driving system housing 4. The upper rubber roller is configured to move in the vertical direction and is pressed against the lower rubber roller below by a spring. The lower rubber roller is driven by the driving motor 3, and the lower rubber roller serves as the driving wheel. The upper rubber roller rotates in opposite directions driven by the driving wheel (lower rubber roller), and the upper rubber roller serves as the driven wheel. The front and rear rubber wheel sets clamp the flux detector cable and rotate synchronously to realize the insertion or removal operation of the flux detector.

[0056] The lower rubber roller rotates counterclockwise, driving the upper rubber roller to rotate clockwise, and the upper and lower rubber rollers jointly push the flux detector cable sandwiched in the middle to insert into the capillary of the flux detector assembly; the lower rubber roller rotates clockwise, driving the upper rubber roller to rotate counterclockwise, and the upper and lower rubber rollers jointly push the flux detector cable sandwiched in the middle to be pulled out of the capillary of the flux detector assembly.

[0057] In one embodiment, the driving motor 3 is a servo motor, which is connected to a main shaft of the lower rubber roller through a reducer and a bevel gear, and the two main shafts of the lower rubber roller are driven through an intermediate gear.

[0058] In one embodiment, the control box mainly includes a PLC, a motion controller, and a power module. The PLC program controls the motion mode of the servo motor, as well as the speed and position of the flux detector insertion.

[0059] In one embodiment, the control screen 8 is a handheld touch screen that provides a control instruction sending interface and real-time feedback information to the operator through a graphical human-computer interaction interface.

[0060] The heavy water reactor core flux detector installation device integrates the alignment, plugging, unplugging, and coiling of the detector and the capillary of the flux detector assembly. The clamped rubber wheel group simulates the human hand clamping action, and the private service motor drives the wheel group to rotate clockwise or counterclockwise to simulate the insertion and unplugging action. At the same time, the handheld touch screen can flexibly control the plugging and unplugging speed, position and operating distance.

[0061] In addition, based on the above-mentioned heavy water reactor core flux detector installation device, the present application also provides a heavy water reactor core flux detector installation method, such as Figure 2 As shown, including:

[0062] Step 1: Install the flux probe cable onto reel 7.

[0063] Take the flux detector out of the packaging box, insert the tail of the flux detector into the limiting groove of the reel 7, rotate the reel 7 to reel the flux detector cable onto the reel 7 until it reaches the end of the flux detector.

[0064] Step 2: Fix the front guide tube 1.

[0065] Observe the equipment layout around the flux detector assembly, design the path of the front guide tube 1 according to the equipment layout around the flux detector assembly, select the front guide tube 1 of appropriate length, dock and lock the front guide tube 1 with the capillary of the flux detector assembly. The flux detector assembly is a component installed on the reactor for measuring flux. Each component contains 12 capillary channels, each with an inner diameter of 3.4mm. These channels run through the reactor core, and most of them are more than 10 meters long. The flux detector is like a wire, and people need to insert the wire-like detector deep into the capillary.

[0066] Step 3: Assemble the guidance system, drive system and control system.

[0067] Check the guide system, drive system and control system. Check the rubber wheels in the drive wheel set 2 for damage and degeneration; check whether the wheel set bearings rotate normally; check whether the rear guide tube 5 and the drive system housing 4 are intact; check whether the servo motor is normal; check whether the appearance of the detector reel bin 6 is intact; check whether the bin door opens and closes smoothly; check whether the reel bearings rotate normally; check whether the handheld control panel and PLC control program are normal.

[0068] Connect the drive system housing 4 to the fixed slot of the detector reel bin 6 and fix it with a pin. Fix the servo motor in the fixed slot of the drive system housing 4 and fix it with a pin. Connect the front guide tube 1 to the quick connector of the drive system housing 4.

[0069] Step 4: Set the detector installation parameters.

[0070] According to the installation position of the flux detector in the reactor, set the installation "position" and "speed" parameters on the handheld control screen.

[0071] Step 5: Insert the flux probe into the capillary of the flux probe assembly.

[0072] Insert the end of the flux detector into the front guide tube 1, hold the flux detector cable and send the flux detector through the front guide tube 1 into the capillary of the flux measurement component.

[0073] Step 6: Install on reel.

[0074] Open the side cover of the drive housing 4, the side cover of the rear guide tube 5, the drive wheel set 2 and the cover of the detector reel compartment 6, put the flux detector cable into the drive wheel set 2 and the rear guide tube 5, put the center hole of the reel on the reel shaft, and close the compartment door.

[0075] Step 7: Fix the device in operating position.

[0076] The front guide tube 1 is connected to the driving system housing 4, and an operator (device fixing operator) is responsible for fixing the device on the operating platform, or fixing the operating device at the operating position in a handheld manner.

[0077] Step 8: Start the control system and install the flux detector.

[0078] Another operator (control panel operator) first confirms that the communication with the device fixer is smooth, and then holds the control panel 8 and clicks the "forward" button. The device fixer operator confirms that the device is running smoothly and the flux detector is inserted smoothly. The control panel operator monitors that the flux detector insertion speed is consistent with the set speed and is installed to the set position.

[0079] Step 9: Install the Flux Detector.

[0080] Take out the flux detector cable from the limit groove of the reel 7, operate the control panel 8 to continue to install the target to the set position, release the locking nuts of the front guide tube 1 and the capillary, disconnect the front guide tube 1 from the drive system housing 4, retrieve the device body and the front guide tube 1 respectively, and complete the flux detector wiring.

[0081] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A heavy water reactor core flux detector installation device, characterized in that: The invention comprises a front guide tube (1) and a rear guide tube (5) which are coaxially arranged, wherein the rear end of the front guide tube (1) is mounted on a quick connector of a drive system housing (4), a driving wheel set (2) is arranged between the front guide tube (1) and the rear guide tube (5), and the driving wheel set (2) is drivingly connected to a drive motor (3); the rear guide tube (5) is connected to a detector reel bin (6), a reel (7) is installed in the detector reel bin (6), the tail of the flux detector is inserted into the reel (7), and the flux detector cable is wound on the reel (7).

2. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The front guide tube (1) is a flexible conical tube, the front end of which is butted against the capillary port of the flux detector assembly, and the rear end of which is arranged in front of the driving wheel pair (2).

3. The heavy water reactor core flux detector installation device according to claim 2, characterized in that: The rear end of the flexible conical tube is a trumpet-shaped structure.

4. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The front end of the front guide tube (1) is provided with a locking nut, through which the front guide tube (1) and the capillary of the flux detector assembly are fixed, and the rear end of the front guide tube (1) is provided with a quick connector, which is connected to the device body.

5. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The front guide tube (1) is a corrugated tube, the side wall of the corrugated tube is slit, and a slit nut is arranged outside the tube wall.

6. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: An extension tube is provided in the middle of the front guide tube (1).

7. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The rear guide tube (5) is a rigid circular tube with bell mouths at both ends.

8. The heavy water reactor core flux detector installation device according to claim 1 or 7, characterized in that: The rear guide tube (5) is installed in a slot of the device body, the front end of the rear guide tube (5) is arranged behind the driving wheel set (2), and the rear end of the rear guide tube (5) is connected to the detector reel bin (6).

9. The heavy water reactor core flux detector installation device according to claim 1 or 8, characterized in that: The side wall of the rear guide tube (5) is slotted, and a sliding door is provided outside the slot.

10. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The reel (7) is installed on the shaft of the detector reel bin (6), and the reel (7) is used to reel up the flux detector.

11. The heavy water reactor core flux detector installation device according to claim 1 or 10, characterized in that: The detector receiving reel bin (6) is provided with a guide groove in the bin for guiding the flux detector to smoothly enter the rear guide tube (5).

12. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The door of the detector reel bin (6) is a hollow structure.

13. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The driving wheel set (2) comprises a front-drive wheel set and a rear-drive wheel set, and each wheel set comprises two rubber rollers.

14. The heavy water reactor core flux detector installation device according to claim 13, characterized in that: The upper rubber roller of the driving wheel pair (2) is arranged to be movable in a vertical direction, and is pressed against the lower rubber roller below by a spring, and the lower rubber roller is driven by the driving motor (3); the lower rubber roller serves as a driving wheel, and the upper rubber roller serves as a driven wheel, and the two upper rubber rollers rotate towards each other under the drive of the two lower rubber rollers, and the front-drive wheel pair and the rear-drive wheel pair clamp the flux detector cable and rotate synchronously, so that the flux detector can be inserted downward or lifted upward.

15. The heavy water reactor core flux detector installation device according to claim 13 or 14, characterized in that: The driving motor (3) is a servo motor, which is connected to the main shaft of the pair of wheel sets via a reducer and a gear.

16. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The device also includes a control box, which includes a PLC, a motion controller, and a power module. The motion mode of the servo motor and the speed and position of the flux detector insertion are controlled by the PLC program.

17. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The device also includes a control screen (8) which provides an operator with a control instruction sending interface and real-time feedback information through a graphical human-computer interaction interface.

18. The heavy water reactor core flux detector installation device according to claim 1, characterized in that: The device further comprises a driving system housing (4), the rear guide pipe (5) is arranged in the driving system housing (4), and the detector reel bin (6) is docked with the driving system housing (4).

19. A method for installing a heavy water reactor core flux detector, characterized in that: include: Step 1: Install the flux detector cable into the reel (7); Step 2: dock the front guide tube (1) with the capillary of the flux detector assembly and lock it; Step 3: Check the driving wheel assembly (2), the detector reel bin (6), and the rear guide tube (5); Step 4: According to the installation position of the flux detector in the reactor, set the installation position and speed parameters on the control panel (8); Step 5: inserting the end of the flux detector into the front guide tube (1), holding the flux detector cable and sending the flux detector through the front guide tube (1) into the capillary of the flux detector assembly; Step 6: Install the reel (7) into the detector reel bin (6); Step 7: Connecting the front guide tube (1) to the drive system housing (4), and fixing the heavy water reactor core flux detector mounting device in an operating position; Step 8: Start the control system and install the flux detector; Step 9: Release the heavy water reactor core flux detector installation device to complete the flux detector installation.

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