Reactor irradiation oversight sample transfer device and method

Abstract

A reactor irradiation supervision sample transport device and method, including a CRUS machine cutting head, a CRUS mechanical arm, the CRUS mechanical arm is connected and fixed with the CRUS machine cutting head, the CRUS machine cutting head passes through the lifting lug hole of the irradiation supervision sample through a telescopic pin shaft, further including a fixed hanger, the fixed hanger is fixed with a pressure vessel through a pressure vessel matching bolt, the fixed hanger includes an X-direction slider and a Y-direction slider, the X-direction slider and the Y-direction slider are connected and control a loading bucket long rod, the loading bucket long rod is connected with a loading bucket head, the loading bucket long rod has a long rod lateral support, and an underwater camera is installed on the long rod of the fixed hanger.The application expands the application range of the reactor pressure vessel in-service inspection CRUS machine, uses the fixed hanger equipped with the necessary CRUS machine as a carrier, replaces the original Russian-supplied supervision sample extraction equipment service platform and mobile machinery, and avoids the complicated installation and removal of the working platform and the mobile machinery.

Description

Technical Field

[0001] This invention relates to the field of nuclear power plant maintenance, specifically to a reactor irradiation monitoring sample transfer device and method. Background Technology

[0002] The reactor pressure vessels of Units 1-4 at Tianwan Nuclear Power Plant contain 12 irradiation monitoring samples, which are fixed to the inner wall of the pressure vessels by 100mm long welds. The irradiation monitoring samples are 6795mm away from the flange face of the pressure vessels, and their external dimensions are 625x186x31.5mm. The heads have φ20 lifting lugs. The units periodically remove the irradiation monitoring samples and conduct performance tests on them to monitor the material properties of the pressure vessels. After the irradiation monitoring sample boxes are cut, they need to be transported to a special protective container. This operation involves the long-distance transport of Sievert-level high-radioactivity samples, which is high-risk and difficult.

[0003] The CRUS machine is a specialized piece of equipment used for the inspection of reactor pressure vessels. The inspection window for pressure vessels covers the window for extracting irradiation monitoring samples.

[0004] The current sample transport procedures and methods for irradiation monitoring devices are as follows:

[0005] 1) Install the clamping flange on the service platform;

[0006] 2) Check the reliable connection of the loading barrel long gripper. Connect the crane to the loading barrel long gripper, open the top cover of the shielded container, and connect the long gripper to the loading barrel inside the shielded container.

[0007] 3) The mobile crane will install and secure the long grab with the loading bucket onto the clamping flange of the service platform;

[0008] 4) Operate the mobile machinery to bring the cutting head with the irradiation monitoring sample close to the loading barrel, observe the relative position of the cutting head and the loading barrel through the camera, and finally irradiate the sample above the opening of the loading barrel.

[0009] 5) Slowly lower the moving machinery to allow the sample to enter the loading container;

[0010] 6) Dismantle the mobile machinery on the service platform and use a crane to lift the cutting head pole out;

[0011] 7) Remove the installation cover plate on the service platform, connect the crane to the special gripper for the shielding container, connect the shielding container with special tools, and install the special gripper and shielding container on the service platform;

[0012] 8) Connect the crane to the long grab, and control the crane to drive the long grab and loading bucket to enter the top of the shielded container from the side of the special grab for the shielded container;

[0013] 9) The hook descends, allowing the loading drum to fall completely into the shielded container. The long gripper is then disengaged from the loading drum and transported by the crane to the ground at a height of 34 meters.

[0014] 10) Use a crane to install the top cover of the shielding container onto the shielding container. After the shielding container has drained of water, use the crane to connect the special grab for the shielding container and lift the shielding container to the ground at a height of 34 meters.

[0015] 11) The special gripper for the shielding container is detached from the shielding container to complete the transfer of the irradiated sample.

[0016] The existing methods for transporting irradiated samples under supervision have the following problems:

[0017] 1) The preparation work is extensive and the transfer process is time-consuming. It is necessary to use a service platform as a temporary attachment point for the special gripper of the shielded container and mobile machinery as the moving mechanism for the long rod of the cutting head.

[0018] 2) The installation of equipment is time-consuming. The transfer process requires the installation of mobile machinery, clamping flanges, special grippers for shielded containers, shielded containers and other components on the service platform. All of these require the use of a ring crane, which occupies key equipment in the plant.

[0019] 3) The equipment gripper connections are complex, and the transfer process involves reliable connections between long grippers and clamping flanges, long grippers and loading barrels, and special grippers for shielded containers and shielded containers;

[0020] 4) Alignment is difficult and the operation is challenging. The transportation process involves aligning the irradiation monitoring sample with the loading container, aligning the loading container with the shielding container, and aligning the top cover of the shielding container with the shielding container. All of the above alignment processes require long-distance alignment using cranes and long working poles, resulting in a large workload for alignment operations.

[0021] Considering the high radioactivity of sievert-level samples from nuclear reactor irradiation monitoring and the harsh working environment during transport, it is necessary to research and invent an efficient and precise device and method for transporting irradiation monitoring samples. Summary of the Invention

[0022] The purpose of this invention is to provide a method for transporting nuclear reaction irradiation-monitored samples, thereby achieving efficient transport of irradiation-monitored samples, reducing operational risks, and improving operational efficiency.

[0023] The technical solution of the present invention is as follows: a reactor irradiation monitoring sample transfer device, comprising a CRUS machine cutting head and a CRUS robotic arm; the CRUS robotic arm is connected and fixed to the CRUS machine cutting head, and the CRUS machine cutting head passes through the lifting lug hole of the irradiation monitoring sample via a retractable pin.

[0024] It also includes a fixed bracket, which is fixed to the pressure vessel by bolts. The fixed bracket includes an X-axis slider and a Y-axis slider, which are connected to and control the loading barrel long rod. The loading barrel long rod is connected to the head of the loading barrel. The loading barrel long rod has a long rod lateral support. The fixed bracket is also equipped with a long rod, on which an underwater camera is installed.

[0025] It also includes a lifting beam and electric hoist, a lifting rod, and a shielding container. The lifting beam and electric hoist are connected to the lifting rod, the lifting rod is connected to the shielding container, and the upper cover of the shielding container is also installed on the lifting rod.

[0026] The CRUS robotic arm is connected and fixed to the CRUS machine cutting head through bolt holes on the mounting base plate.

[0027] The loading barrel's long rod is connected to the loading barrel's head via a buckle at the head.

[0028] The boom is connected to the top cover of the shielding container via a buckle at the head.

[0029] A method for transporting reactor irradiation monitoring samples includes the following steps:

[0030] S1: Transfer the irradiation monitoring sample from the CRUS machine cutting head into the loading container;

[0031] S1.1: The CRUS machine cutting tool head carries the irradiation monitoring sample underwater;

[0032] S1.2: A fixed bracket is installed on the pressure vessel, the loading barrel long rod is connected to the loading barrel, and the loading barrel long rod is connected to the fixed bracket;

[0033] S1.3: Lower the loading barrel rod into the pressure vessel, move the X-axis slider of the fixed bracket forward, and lower the loading barrel rod;

[0034] S1.4: Continue to lower the loading barrel rod so that the upper end of the loading barrel is below the water surface of the pressure vessel;

[0035] S1.5: Move the fixed bracket X-axis slider back to make the CRUS machine robotic arm and the loading barrel misalign in the vertical direction. After raising the CRUS machine robotic arm, rotate the CRUS robotic arm to make the monitoring sample and the loading barrel guide opening in a straight line.

[0036] S1.6: Adjust the X-axis slider on the fixed bracket until the loading bucket contacts the front of the CRUS machine cutting head;

[0037] S1.7: Open the lateral support of the loading barrel long rod, and the loading barrel long rod forms a lateral support on the inner wall of the pressure vessel;

[0038] S1.8: Adjust the angle and height of the CRUS robotic arm until the irradiation monitoring sample enters the loading bucket;

[0039] S1.9: Retract the retractable pin and allow the irradiation monitoring sample to fall into the loading bucket;

[0040] S2: Transfer the loading drum into the shielded container, install the top cover of the shielded container, and lift the shielded container out:

[0041] S2.1: Complete the assembly of the lifting beam and electric hoist, and open the top cover of the shielding container;

[0042] S2.2: Install a laser positioner on the long rod of the loading bucket;

[0043] S2.3: Move the X-axis slider of the fixed bracket forward to transport the loading bucket and the loading bucket rod to the center area of ​​the pressure vessel;

[0044] S2.4: The lifting beam and electric hoist are connected to the shielded container and enter the pressure vessel together, ensuring that the upper guide of the shielded container is lower than the lower end of the loading bucket;

[0045] S2.5: Adjust the boom to ensure that the loading bucket and the pressure vessel are aligned radially in the pressure vessel.

[0046] S2.6: Adjust the Y-axis slider on the fixed bracket to align the shielding container with the loading drum;

[0047] S2.7: Lower the boom to allow the loading bucket to fully enter the shielded container, and manually rotate the loading bucket rod to disengage the loading bucket rod from the loading bucket;

[0048] S2.8: Manually operate the loading barrel long rod to move upwards until it leaves the upper end face of the shielded container;

[0049] S2.9: Operate the electric hoist to lower the top cover of the shielded container and place it onto the shielded container to complete the closing of the cover;

[0050] S2.10: After the shielding container has drained, it is lifted out of the pressure vessel to complete the transfer of the irradiation monitoring sample.

[0051] In step S1.1, the CRUS machine cutting tool head carries the irradiation monitoring sample to a position 2m underwater.

[0052] In S1.3, during the lowering of the loading barrel rod, the minimum distance between the outer edge of the loading barrel and the inner wall of the pressure vessel is 432mm.

[0053] In step S1.4, the upper end face of the loading bucket is positioned 3000 mm below the water surface of the pressure vessel.

[0054] In step S1.8, an underwater camera is used to view the position of the irradiation monitoring sample and the guide port of the loading bucket from above.

[0055] In step S2.6, the shielding container and the loading barrel are aligned using an underwater camera and an underwater laser.

[0056] The significant advantages of this invention are:

[0057] The application scope of the reactor pressure vessel inspection CRUS machine has been expanded. The CRUS machine, which must be installed, is equipped with a fixed bracket as a transport vehicle to replace the original Russian-supplied supervision sample extraction equipment service platform and mobile machinery, thus avoiding the cumbersome installation and dismantling of the work platform and mobile machinery.

[0058] When used in conjunction with a CRUS machine with high positioning accuracy (up to 1mm), it moves and centers towards the loading drum, resulting in higher transfer efficiency;

[0059] Compared to the original service platform and clamping flange, the fixed rack has expanded its functions. The cross slide on the rack can adjust the position of the loading bucket in the X / Y direction, making it more adaptable.

[0060] The lifting beam with electric hoist optimizes the process of transferring the loading bucket to the shielded container, avoids the installation of the shielded container special gripper on the service platform, and makes the connection between the lifting beam and the ring crane simpler. While realizing the function of the original shielded container special gripper, it adds the function of directly disassembling and reassembling the top cover of the shielded container, reducing the occupation of the critical resource ring crane.

[0061] The lifting beam equipped with a laser emitter improves the alignment efficiency between the loading drum and the shielding container. Attached Figure Description

[0062] Figure 1 : A schematic diagram of the reactor irradiation monitoring sample transfer device provided by the present invention;

[0063] Figure 2 : A schematic diagram of the CRUS machine cutting head of the reactor irradiation monitoring sample transfer device provided by the present invention;

[0064] Figure 3 : A schematic diagram of the loading barrel provided by the present invention;

[0065] Figure 4 : A schematic diagram of the loading barrel long rod provided by the present invention;

[0066] In the diagram: 1. CRUS machine cutting head; 2. Irradiation monitoring sample; 3. Pressure vessel; 4. Fixed bracket; 5. Loading bucket long rod; 6. Loading bucket; 7. X-axis slider; 8. CRUS robotic arm; 9. Lifting beam and electric hoist; 10. Lifting rod; 11. Shielding container top cover; 12. Shielding container; 13. Pressure vessel matching bolts; 14. Bucket connecting bolts; 15. Mounting base plate; 16. Telescopic pin; 17. Underwater camera; 18. Y-axis slider; 19. Long rod lateral support. Detailed Implementation

[0067] The present invention will be further described in detail below with reference to the accompanying drawings and examples:

[0068] A reactor irradiation monitoring sample transfer device includes a CRUS machine cutting head 1 and a CRUS robotic arm 8. The CRUS robotic arm 8 is connected and fixed to the CRUS machine cutting head 1 through bolt holes on the mounting base plate 15. The CRUS machine cutting head 1 is fixed to the irradiation monitoring sample 2 by passing through the lifting lug hole of the irradiation monitoring sample 2 through a telescopic pin 16. The fixed bracket 4 is fixed in position by threaded engagement between the pressure vessel matching bolt 13 and the main bolt hole on the pressure vessel 3. The fixed bracket 4 includes an X-axis slider 7 and a Y-axis slider 18. The loading bucket long rod 5 is connected to the head of the loading bucket 6 through a buckle at the head. The lifting beam and electric hoist 9 are connected to the shielding container 12 through bolts 14. The lifting rod 10 is connected to the upper end cover 11 of the shielding container through a buckle at the head. The long rod with an underwater camera 17 is connected to the fixed bracket 4 through a clamp. The loading bucket long rod 5 has a long rod lateral support 19.

[0069] A method for transporting reactor irradiation monitoring samples includes the following steps:

[0070] S1: The irradiation monitoring sample 2 is transferred from the CRUS machine cutting head 1 to the loading bucket 6. This step is completed by the CRUS, the fixed bracket, the loading bucket long rod gripper, etc. The main equipment layout is as follows: Figure 1 As shown

[0071] S1.1: The CRUS machine cutting tool head 1, carrying the cut irradiation monitoring sample 2, moves to a position 2m underwater;

[0072] S1.2: Install a fixed bracket 4 on the pressure vessel 3, and connect the loading barrel long rod 5 to the loading barrel 6. The loading barrel long rod 5 is connected to the fixed bracket 4 through the stop at the end of the fixed bracket 4.

[0073] S1.3: Lower the loading barrel long rod 5 into the pressure vessel 3, and move the X-axis slider 7 of the fixed bracket forward. During the lowering process of the loading barrel long rod 5, the minimum distance between the outer edge of the loading barrel 6 and the inner wall of the pressure vessel 3 is 432mm.

[0074] S1.4: Continue to lower the loading barrel rod 5 so that the upper end of the loading barrel 6 is 3000mm below the water surface of the pressure vessel 3;

[0075] S1.5: Move the fixed bracket X-axis slider 7 back 450mm, and the CRUS machine robotic arm 8 and the loading barrel 6 will be misaligned in the vertical direction. After raising the CRUS machine robotic arm 8 by 4220mm, the bottom of the irradiation monitoring sample 2 will be 150mm away from the guide opening of the loading barrel 6. Rotate the CRUS robotic arm 8 to make the monitoring sample 2 and the guide opening of the loading barrel 6 in a straight line.

[0076] S1.6: Adjust the X-axis slider 7 on the fixed bracket so that the loading bucket 6 contacts the proximity switch at the front of the CRUS machine cutting head 1;

[0077] S1.7: Open the lateral support 19 of the loading barrel long rod 5, and the loading barrel long rod 5 forms a lateral support on the inner wall of the pressure vessel 3;

[0078] S1.8: Adjust the angle and height of the CRUS robotic arm 8, and use the underwater camera 17 to look down at the position of the irradiation monitoring sample 2 and the guide port of the loading barrel 6 until the irradiation monitoring sample 2 enters the loading barrel 6.

[0079] S1.9: Operate the CRUS machine to retract the retractable pin 16, allowing the irradiation monitoring sample 2 to fall into the loading bucket 6.

[0080] S2: Transfer the loading bucket 6 into the shielding container 12, install the upper cover 11 of the shielding container, and lift the shielding container 12 to the maintenance area. This step requires the use of the lifting beam 9, the loading bucket 6, and the lifting rod 10. The specific method is as follows:

[0081] S2.1: Complete the assembly of the lifting beam in the maintenance area, and use the manual lifting rod to open the upper cover 11 of the shielding container;

[0082] S2.2: Install a laser positioner on the loading barrel long rod 5.

[0083] S2.3: Move the X-axis slider 7 of the fixed bracket 4 forward by 450mm, and transport the loading bucket 6 and the loading bucket rod 5 to the central area of ​​the pressure vessel 3;

[0084] S2.4: The lifting beam is connected to the shielded container 12 and together they are lifted into the pressure vessel 3, ensuring that the upper end of the shielded container 12 is lower than the lower end of the loading bucket 6. The relative position of the shielded container 12 and the lifting beam is observed through the underwater camera 17.

[0085] S2.5: Manually adjust the lifting rods 10 on both sides of the lifting beam and the limiting rods on both sides of the fixed bracket 4 to ensure that the loading bucket 6 and the pressure vessel 3 are consistent in the radial direction of the pressure vessel 3;

[0086] S2.6: Adjust the Y-axis slider 18 on the fixed bracket to achieve alignment between the main shaft of the shielding container 12 and the center hole of the loading barrel 6 through the underwater camera 17 and the underwater laser. When the light spots formed by the laser are all within the light ring with a width of <6.5mm, it can be determined that the center hole of the loading barrel 6 and the main shaft of the shielding container 12 are aligned.

[0087] S2.7: Manually operate the loading barrel lifting rod 10 to lower it so that the loading barrel 6 is completely inserted into the shielded container 12. Manually rotate the loading barrel long rod 5 to disengage the loading barrel long rod 5 from the loading barrel 6 by means of friction.

[0088] S2.8: Manually operate the loading barrel long rod 5 to move upward until it leaves the upper end face of the shielded container 12, and move the crane towards the center of the pressure vessel to ensure that there is no interference during the falling of the upper end cover of the shielded container 12;

[0089] S2.9: Operate the electric hoist to lower the upper cover 11 of the shielding container and finally let it fall onto the shielding container 12 through the guide, thus completing the closing of the cover;

[0090] S2.10: After the shielding container 12 is drained of water, it is lifted out of the pressure vessel 3 to complete the transfer of the irradiation supervision sample.

[0091] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. A reactor irradiation monitoring sample transfer device, characterized in that: Includes a CRUS machine cutting head (1) and a CRUS robotic arm (8); the CRUS robotic arm (8) is connected and fixed to the CRUS machine cutting head (1), and the CRUS machine cutting head (1) passes through the lifting lug hole of the irradiation monitoring sample (2) through a telescopic pin (16). It also includes a fixed bracket (4), which is fixed to the pressure vessel (3) by pressure vessel matching bolts (13). The fixed bracket (4) includes an X-axis slider (7) and a Y-axis slider (18), which are connected to and control the loading barrel long rod (5). The loading barrel long rod (5) is connected to the head of the loading barrel (6). The loading barrel long rod (5) has a long rod lateral support (19). The fixed bracket (4) is also equipped with a long rod (20), and an underwater camera (17) is installed on the long rod (20). It also includes a lifting beam and electric hoist (9), a lifting rod (10), and a shielding container (12). The lifting beam and electric hoist (9) are connected to the lifting rod (10), the lifting rod (10) is connected to the shielding container (12), and the upper end cover (11) of the shielding container is also installed on the lifting rod (10).

2. The reactor irradiation monitoring sample transfer device according to claim 1, characterized in that: The CRUS robotic arm (8) is connected and fixed to the CRUS machine cutting head (1) through bolt holes on the mounting base plate (15).

3. The reactor irradiation monitoring sample transfer device according to claim 1, characterized in that: The loading barrel long rod (5) is connected to the head of the loading barrel (6) by a buckle at the head.

4. The reactor irradiation monitoring sample transfer device according to claim 1, characterized in that: The boom (10) is connected to the top cover (11) of the shielding container via a buckle at the head.

5. A method for using the reactor irradiation monitoring sample transfer device as described in claim 1, characterized in that: Includes the following steps: S1: Transfer the irradiation monitoring sample (2) from the CRUS machine cutting head (1) into the loading barrel (6); S1.1: The CRUS machine cutting head (1) carrying the irradiation monitoring sample (2) is moved underwater; S1.2: Install a fixed bracket (4) on the pressure vessel (3), connect the loading barrel long rod (5) to the loading barrel (6), and connect the loading barrel long rod (5) to the fixed bracket (4); S1.3: Lower the loading barrel rod (5) into the pressure vessel (3), move the X-axis slider (7) of the fixed bracket (4) forward, and lower the loading barrel rod (5); S1.4: Continue to lower the loading barrel rod (5) so that the upper end of the loading barrel (6) is below the water surface of the pressure vessel (3); S1.5: Operate the fixed bracket X-axis slider (7) to move back, so that the CRUS robotic arm (8) and the loading barrel (6) are misaligned in the vertical direction. After raising the CRUS robotic arm (8), rotate the CRUS robotic arm (8) so that the supervised sample (2) and the guide opening of the loading barrel (6) are in a straight line. S1.6: Adjust the X-axis slider (7) on the fixed bracket so that the loading bucket (6) contacts the front end of the CRUS machine cutting head (1); S1.7: Open the lateral support (19) of the loading barrel long rod (5), and the loading barrel long rod (5) forms a lateral support on the inner wall of the pressure vessel (3); S1.8: Adjust the angle and height of the CRUS robotic arm (8) until the irradiation monitoring sample (2) enters the loading bucket (6); S1.9: Retract the retractable pin (16) and the irradiation monitoring sample (2) falls into the loading bucket (6); S2: Transfer the loading bucket (6) into the shielding container (12), install the upper end cover (11) of the shielding container, and lift the shielding container (12) out: S2.1: Complete the assembly of the lifting beam and electric hoist (9), and open the upper cover (11) of the shielding container; S2.2: Install a laser positioner on the loading barrel rod (5); S2.3: Move the X-axis slider (7) of the fixed bracket (4) forward to transport the loading bucket (6) and the loading bucket rod (5) to the central area of ​​the pressure vessel (3); S2.4: The lifting beam and electric hoist (9) are connected to the shielded container (12) and enter the pressure vessel (3) together, ensuring that the upper end of the shielded container (12) is lower than the lower end of the loading bucket (6); S2.5: Adjust the boom (10) to ensure that the loading bucket (6) and the pressure vessel (3) are aligned radially in the pressure vessel (3); S2.6: Adjust the Y-axis slider (18) on the fixed bracket (4) to align the shielding container (12) with the loading barrel (6); S2.7: Move the boom (10) down so that the loading barrel (6) is completely inside the shielded container (12), and manually rotate the loading barrel rod (5) to disengage the loading barrel rod (5) from the loading barrel (6); S2.8: Manually operate the loading barrel rod (5) to move upward until it leaves the upper surface of the shielded container (12); S2.9: Operate the electric hoist (9) to lower the upper cover (11) of the shielding container and place it onto the shielding container (12) to complete the closing of the cover; S2.10: After the shielding container (12) is drained, it is lifted out of the pressure vessel (3) to complete the transfer of the irradiation supervision sample.

6. The reactor irradiation monitoring sample transport method according to claim 5, characterized in that: In S1.1, the CRUS machine cutting head (1) carries the irradiation monitoring sample (2) to a position 2m underwater.

7. The reactor irradiation monitoring sample transport method according to claim 5, characterized in that: In S1.3, during the lowering of the loading barrel rod (5), the minimum distance between the outer edge of the loading barrel (6) and the inner wall of the pressure vessel (3) is 432mm.

8. A method for transporting reactor irradiation monitoring samples according to claim 5, characterized in that: In S1.4, the upper end face of the loading bucket (6) is positioned 3000 mm below the water surface of the pressure vessel (3).

9. A method for transporting reactor irradiation monitoring samples according to claim 5, characterized in that: In S1.8, an underwater camera (17) is used to view the position of the irradiation monitoring sample (2) and the guide port of the loading bucket (6).

10. A method for transporting reactor irradiation monitoring samples according to claim 5, characterized in that: In S2.6, the shielding container (12) and the loading barrel (6) are aligned by an underwater camera (17) and an underwater laser.

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