CN113436764A - High-temperature gas cooled reactor fuel ball blocking detection and protection method - Google Patents
High-temperature gas cooled reactor fuel ball blocking detection and protection method Download PDFInfo
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- CN113436764A CN113436764A CN202110746151.1A CN202110746151A CN113436764A CN 113436764 A CN113436764 A CN 113436764A CN 202110746151 A CN202110746151 A CN 202110746151A CN 113436764 A CN113436764 A CN 113436764A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/003—Remote inspection of vessels, e.g. pressure vessels
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/003—Remote inspection of vessels, e.g. pressure vessels
- G21C17/013—Inspection vehicles
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/14—Period meters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses a method for detecting and protecting fuel ball blockage of a high-temperature gas cooled reactor, which comprises the following steps: (1) the control system sends out an instruction to enable the inspection operation robot to move along the operation guide rail, and the pipeline through which the fuel ball passes is inspected through the detection assembly on the inspection operation robot; (2) when the inspection operation robot detects that the radiation value of a pipeline through which the fuel ball passes at certain positions reaches a set threshold value, the inspection operation robot indicates that the fuel ball is blocked, and radiation detection information is transmitted to the control system; the control system judges the received radiation detection information and determines whether the fuel ball is blocked at the corresponding position; when the control system determines that the fuel ball passes through the pipeline and is blocked, the control system sends an instruction to the inspection operation robot; the inspection operation robot puts shielding materials in the shielding protection chamber into a shielding section corresponding to the protection guide rail above the pipeline through which the fuel balls pass. The method and the device have important significance for protecting the environment and maintaining the national safety.
Description
Technical Field
The application relates to the field of radiation protection, in particular to the field of radiation protection and safe operation of a nuclear power station, and specifically relates to a fuel ball blockage detection and protection method for a high-temperature gas cooled reactor.
Background
The development and utilization of nuclear technology and nuclear energy bring new power to the development of human society, and the capability of human beings for understanding and transforming the world is greatly enhanced. Nuclear energy development is accompanied by nuclear security risks and challenges. For human beings to better utilize nuclear energy and realize greater development, nuclear technology must be innovated, nuclear safety is ensured, and nuclear emergency is well made. The nuclear safety is a life line for the continuous and healthy development of the nuclear energy industry, and the nuclear emergency is an important guarantee for the continuous and healthy development of the nuclear energy industry.
High Temperature Gas Cooled Reactor (HTGR) is a graphite moderated helium Cooled Reactor design. The HTR-PM built in China at present is actually one of high-temperature gas cooled reactors, namely a Pebble bed reactor (Pebble bed reactor). The concept of a high temperature gas cooled pebble bed reactor was first proposed by Farrington Danielst from oak ridge laboratories, but was only envisaged, and was later implemented by professor Rudolf Schulten in germany, an exemplary engineering AVR was designed and incorporated into the grid for power generation in 1967, followed by the construction of THTR-300, and PBMR in south africa. In 2003, HTR-10 was successfully critically incorporated into the grid.
The high temperature gas cooled Pebble bed reactor is very different in fuel design from the conventional pressurized water reactor/boiling water reactor, the most special point being that it does not use a fuel bulb but rather a fuel Pebble. Each fuel sphere is a sphere of 60mm diameter, the outermost layer of the sphere is a 5mm graphite layer and within the graphite layer are the TRISO particles dispersed in graphite, each fuel sphere containing about 8000 to 11,000 TRISO particles, depending on the design. TRISO is a particle with a diameter of about 0.9mm made of a multilayer material, and the center of the particle is UO2 fuel with a diameter of 0.5 mm. The design of graphite nodules enables the reactor core to have high heat conduction coefficient, large heat capacity and good thermal stability. The fission products are well retained in the fuel sphere below 1600 ℃.
Since the reactor is of the pebble bed type, the refueling can be carried out while the reactor is in operation, and new fuel pebbles are filled into the reactor from the top of the reactor and discharged from the bottom of the reactor. The fuel spheres move downwards gradually in the reactor, and the fuel consumption is increased gradually until finally discharged from the bottom of the reactor. The discharged fuel spheres will go through burnup detection and re-load into the stack through the refueling system if the Gao burnup did not reach the design specification (different refueling schemes are designed). Because the material is changed on line, the reactor does not need to consider extra reactivity when charging, and the safety is correspondingly improved.
Compared with other reactor types, the novel high-temperature gas cooled reactor is qualitatively improved in the aspect of safe operation, but still faces the potential risk that fuel balls block material conveying pipelines, and the research on the high-temperature gas cooled reactor fuel ball blocking solving technology is not slow.
Disclosure of Invention
The invention of the present application aims to: aiming at the problem that the high-temperature gas cooled reactor is qualitatively improved in the aspect of safe operation relative to other reactor types, but still faces the potential risk that a fuel ball blocks a material conveying pipeline, a fuel ball blocking detection and protection method for the high-temperature gas cooled reactor is provided.
In order to achieve the purpose, the following technical scheme is adopted in the application:
the method for detecting and protecting the blockage of the fuel ball of the high-temperature gas cooled reactor comprises the following steps:
(1) daily inspection
The control system sends out an instruction to enable the inspection operation robot to move along the operation guide rail, and the pipeline through which the fuel ball passes is inspected through the detection assembly on the inspection operation robot;
(2) jam protection
When the inspection operation robot detects that the radiation value of a pipeline through which the fuel ball passes at certain positions reaches a set threshold value, the inspection operation robot indicates that the fuel ball is blocked, and radiation detection information is transmitted to the control system;
the control system judges the received radiation detection information and determines whether the fuel ball is blocked at the corresponding position; when the control system determines that the fuel ball passes through the pipeline and is blocked, the control system sends an instruction to the inspection operation robot; the inspection operation robot puts shielding substances in the shielding protection chamber into a shielding section corresponding to the protection guide rail above the pipeline through which the fuel balls pass;
in the process that the inspection operation robot puts shielding materials into the shielding section, a detection assembly on the inspection operation robot continuously detects the position and transmits the obtained radiation detection information to a control system; when the measured radiation detection information is reduced to a set value, the radiation protection of the position is realized, the control system sends an instruction to the inspection operation robot, the inspection operation robot stops throwing shielding materials into the shielding section, and the protection operation is completed.
The shielding substance is lead particles or a bag filled with the lead particles.
When the shielding material is a bag filled with lead particles, the inspection operation robot cuts the bag to improve the contact area between the lead particles and the inner surface of the shielding section after putting the shielding material in the shielding protection chamber into the shielding section; when the placement is completed, the operation is repeated until the radiation detection information falls to a set value.
After the fuel ball blockage problem is solved, the inspection operation robot continues to inspect and prepare for next protection; lead particles in the shielding section are put back into the shielding protection chamber, so that the effect of long-term protection is achieved.
The device used for the method comprises a guide rail mounting bracket used for providing support for the operation guide rail, an inspection operation robot, a support bracket, a protection guide rail, a shielding protection chamber used for placing shielding substances and a control system;
the inspection operation robot is connected with the operation guide rail and can move relatively along the operation guide rail;
the inspection operation robot comprises a track walking mechanism matched with an operation guide rail, a telescopic sleeve capable of stretching along the vertical direction, a joint mechanical arm, a mechanical jaw and a detection assembly;
the telescopic sleeve is connected with the rail travelling mechanism, the rail travelling mechanism can drive the telescopic sleeve to move synchronously, the joint mechanical arm is connected with the telescopic sleeve and can drive the joint mechanical arm to move along the vertical direction, the mechanical clamping jaw is connected with the joint mechanical arm and can realize corresponding clamping operation, the detection assembly is connected with the rail travelling mechanism, and the rail travelling mechanism can drive the detection assembly to move synchronously so as to realize detection of the fuel balls passing through the pipeline;
the protection guide rail is a groove with an opening at the upper end, the protection guide rail is arranged on a support bracket, the support bracket can provide support for the protection guide rail, the bottom surface of the protection guide rail is composed of bottom plate side sections and bottom plate middle sections, the bottom plate side sections are in a group, the bottom plate side sections are arranged on two sides of the bottom plate middle section, the section of the bottom plate middle section along the vertical direction is arc-shaped, the lower end surface of the bottom plate middle section is arranged on a pipeline through which fuel balls pass, the section of the bottom surface of the protection guide rail along the vertical direction is in an omega shape, and the lower end surface of the bottom plate middle section can coat the pipeline through which the fuel balls pass;
the protective guide rail is internally provided with a plurality of partition plates, and the partition plates divide the groove in the protective guide rail into a plurality of shielding sections for containing shielding materials;
the inspection operation robot can move the shielding material in the shielding protection chamber into a set shielding section to realize radiation shielding of the pipeline at the fuel ball blockage position;
and the inspection operation robot is connected with the control system.
The bottom surface of the protective guide rail is in an omega shape along the vertical section, and the height of the lower end surface of the middle section of the bottom plate is larger than the diameter of a pipeline through which the fuel ball passes.
The shielding material is arranged in the shielding protection chamber.
The shielding substance is lead particles or a bag filled with the lead particles.
The operation guide rail is an I-shaped aluminum alloy guide rail.
The inspection robot gets electricity through the operation guide rail, and the inspection robot and the control system transmit sensor data and control commands through wireless communication.
The operation guide rail is provided with a power transmission slide rail, and the control system is provided with a sliding contact current collector matched with the power transmission slide rail.
The protection guide rail further comprises guide rail side plates which are in a group, the guide rail side plates are respectively arranged on two sides of the bottom surface of the protection guide rail, and the section of the protection guide rail in the vertical direction forms a groove with an upward opening.
The detection assembly comprises a radiation-resistant guide rail camera, an illumination light supplement lamp, a collision detection sensor, a radiation detection head and a radiation-resistant pan-tilt camera;
the radiation-resistant guide rail camera, the illumination light supplement lamp and the collision detection sensor are respectively connected with the operation guide rail, the operation guide rail can provide support for the radiation-resistant guide rail camera, the illumination light supplement lamp and the collision detection sensor, the radiation detection head is connected with the joint mechanical arm, the joint mechanical arm can drive the radiation detection head to move synchronously and can realize radiation monitoring on the grabbing position of the mechanical jaw, and the radiation-resistant pan-tilt camera is connected with the joint mechanical arm and can acquire an image of the grabbing position of the mechanical jaw;
the radiation-resistant guide rail camera, the lighting light supplement lamp, the collision detection sensor, the radiation detection head and the radiation-resistant pan-tilt camera are respectively connected with the control system.
The joint mechanical arm is a six-degree-of-freedom mechanical arm.
Under the limitation of strong ionizing radiation, toxicity and pollution control in the nuclear reactor, before the blocking position in the reactor is ascertained and the blocked pipeline is shielded, workers cannot enter the accident site to perform accident handling work, and great difficulty is brought to the analysis and emergency treatment (handling) of the nuclear accident site conditions.
Therefore, the solving of the fuel ball blockage of the high-temperature gas cooled reactor mainly relates to two aspects of detection and disposal. The detection task mainly aims at detecting the blocking position in a high-temperature gas cooled reactor material conveying pipeline by adopting a radiation detector; the main task of the disposal is to correspondingly protect the blocking position after the blocking position is ascertained. For this reason, this application proposes, utilize the terminal mechanical jack catch of patrolling and examining work robot to carry the lead sand to the card stifled position to realize corresponding pipeline shielding's means.
By adopting the method and the device, the fuel ball can be detected and shielded and protected through the pipeline, an operator is replaced to execute tasks such as detection, processing and disposal in a radiation environment, and technical bases are provided for finding out the accident position, evaluating the accident influence consequence, deciding emergency protection actions, formulating a processing disposal scheme, taking recovery measures and the like. The method is used as a means for controlling, relieving and lightening nuclear accidents, and has important significance for protecting the public, protecting the environment, guaranteeing the social stability and maintaining the national security.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
fig. 1 is an overall schematic diagram of the system in embodiment 1.
Fig. 2 is a front view of the inspection robot in embodiment 1.
Fig. 3 is an axial view of the inspection robot in embodiment 1.
The labels in the figure are: 1. guide rail installing support, 2, operation guide rail, 3, patrol and examine operation robot, 4, shielding guard room, 20, rail running gear, 21, telescopic sleeve, 22, joint arm, 23, mechanical claw.
Detailed Description
All of the features disclosed in this specification, or all of the steps in any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
Any feature disclosed in this specification may be replaced by alternative features serving equivalent or similar purposes, unless expressly stated otherwise. That is, unless expressly stated otherwise, each feature is only an example of a generic series of equivalent or similar features.
Example 1
The application aims to develop a whole set of radiation-resistant robot system and a detection and protection method, and the detection assembly carried by the inspection robot can be used for accurately judging the blocking position of a fuel ball outside a pipe, so that accurate data support is provided for further treatment decision. After the blocking position is detected, the lead sand is conveyed to the blocking position by using a detection assembly at the tail end of the inspection robot, so that the corresponding position of the pipeline is shielded.
The device of this embodiment includes guide rail installing support, operation guide rail, patrols and examines operation robot, support holder, protection guide rail, shielding protection room, control system. The guide rail mounting bracket is used for providing support for the operation guide rail, and the operation guide rail is preferably an I-shaped aluminum alloy guide rail; the shielding protection chamber is used for placing shielding substances.
In this embodiment, the operation guide rail links to each other with the guide rail installing support, and it links to each other with the operation guide rail to patrol and examine work robot. In this structure, the guide rail installing support can provide the support for the operation guide rail, and it then can follow operation guide rail relative motion to patrol and examine operation robot. In one particular example, the work rail is telescopically adjustable in length.
In this embodiment, patrol and examine work robot include with operation guide rail matched with track running gear, can follow the flexible telescope tube of vertical direction, joint arm, mechanical claw, determine module.
The telescopic sleeve is connected with the rail travelling mechanism, the joint mechanical arm is connected with the telescopic sleeve, the mechanical clamping jaw is connected with the joint mechanical arm, and the detection assembly is connected with the rail travelling mechanism. In the structure, the track travelling mechanism can drive the telescopic sleeve to move synchronously, the telescopic sleeve can drive the joint mechanical arm to move along the vertical direction, and the mechanical clamping jaw is used for realizing corresponding clamping operation; the rail travelling mechanism can drive the detection assembly to move synchronously so as to realize the detection of the fuel balls passing through the pipeline.
In this embodiment, telescopic sleeve adopts tertiary telescopic machanism, and the motor drive is adopted in the lift, and the motor is gear motor. The wire rope coiling mechanism is installed at the tail end of the speed reducing motor, the other end of the wire rope is connected with the last section of the telescopic sleeve, the wire coiling mechanism is driven to rotate through the driving motor, and then the telescopic sleeve can be lifted. The cylinder wall of the telescopic sleeve is guided by a linear guide rail, and the linear guide rail has high lubrication and rigidity, so that the lifting stability of the telescopic sleeve is ensured. The cutting tool is installed to one side of mechanical jack catch, and this mechanical jack catch possesses two functions simultaneously, realizes that lead bag (the sack that is equipped with the lead button promptly) presss from both sides and gets the transport, and second utilizes the cutting tool who carries to rip lead bag.
In this embodiment, the detection component includes resistant radiation guide rail camera, illumination light filling lamp, collision detection sensor, radiation detection head, resistant radiation cloud platform camera. The radiation-resistant guide rail camera, the lighting light supplement lamp and the collision detection sensor are respectively connected with the operation guide rail; the radiation detection head is connected with the joint mechanical arm, and the joint mechanical arm can drive the radiation detection head to move synchronously and can realize radiation monitoring on the grabbing position of the mechanical clamping jaw; the radiation-resistant pan-tilt camera is connected with the joint mechanical arm and can acquire images of the grabbing positions of the mechanical clamping jaws. In this embodiment, the joint robot arm is a six-degree-of-freedom robot arm. In this embodiment, install resistant radiation guide rail camera, illumination light filling lamp, collision detection sensor on rail running gear's shell, left and right sides symmetrical arrangement for patrol and examine the safety of work robot when patrolling and examining and carrying out the operation automatically. The radiation-resistant guide rail camera forms high-definition colors, and the high-brightness illumination light supplement lamp can meet all-weather working requirements in daytime and at night.
In this embodiment, the protection guide rail is upper end open-ended recess, and the protection guide rail setting is on the support holder. The bottom surface of the protective guide rail is composed of bottom plate side sections and bottom plate middle sections, the bottom plate side sections are in a group, and the bottom plate side sections are arranged on two sides of the bottom plate middle section; the section of the middle section of the bottom plate along the vertical direction is arc-shaped, and the lower end surface of the middle section of the bottom plate is arranged on a pipeline through which the fuel balls pass; the bottom surface of the protection guide rail is in an omega shape along the vertical section, and the lower end surface of the middle section of the bottom plate can coat the pipeline through which the fuel balls pass (in the embodiment, the height of the lower end surface of the middle section of the bottom plate is greater than the diameter of the pipeline through which the fuel balls pass). Furthermore, the protection guide rail also comprises guide rail side plates which are in a group, the guide rail side plates are respectively arranged on two sides of the bottom surface of the protection guide rail, and the section of the protection guide rail along the vertical direction forms a groove with an upward opening.
In this embodiment, be provided with a plurality of partition plate in the protection guide rail, the recess that partition plate will protect in the guide rail is cut apart into a plurality of shielding section that is used for holding shielding material. The inspection robot can move shielding materials in the shielding protection chamber into a set shielding section so as to realize radiation shielding of a pipeline at the blockage position of the fuel ball.
In this embodiment, a shielding material is placed in the shielding chamber. The shielding substance is preferably a bag containing lead shot.
In this embodiment, resistant radiation guide rail camera, illumination light filling lamp, collision detection sensor, radiation detection head, resistant radiation cloud platform camera, patrol and examine operation robot and link to each other with control system respectively.
And furthermore, the inspection operation robot gets electricity through the operation guide rail, and the inspection operation robot and the control system transmit sensor data and control commands by utilizing wireless communication. In one embodiment, the operation guide rail is provided with a power transmission slide rail, and the control system is provided with a sliding contact current collector matched with the power transmission slide rail.
After the inspection is finished, the inspection robot returns to the lead protection chamber preset at the fixed point of the operation guide rail to be standby, and the electric control system of the inspection robot is just in the lead protection chamber. By the method, the radiation-resistant total dose upper limit of the inspection operation robot can be improved, and the service life of the inspection operation robot is prolonged.
Based on the device, the method for detecting and protecting the blockage of the fuel ball of the high-temperature gas cooled reactor comprises the following steps.
(1) Daily inspection
The control system sends out an instruction to enable the inspection operation robot to move along the operation guide rail, and the pipeline through which the fuel balls pass is inspected through the detection assembly on the inspection operation robot.
(2) Jam protection
When the inspection operation robot detects that the radiation value of a pipeline through which the fuel ball passes at certain positions reaches a set threshold value, the inspection operation robot indicates that the fuel ball is blocked, and radiation detection information is transmitted to the control system.
The control system judges the received radiation detection information and determines whether the fuel ball is blocked at the corresponding position. When the control system determines that the fuel ball passes through the pipeline and is blocked, the control system sends an instruction to the inspection operation robot; the inspection operation robot puts shielding materials in the shielding protection chamber into a shielding section corresponding to the protection guide rail above the pipeline through which the fuel balls pass.
In the process of putting shielding materials into the shielding section by the inspection operation robot, the detection assembly on the inspection operation robot continuously detects the position and transmits the obtained radiation detection information to the control system. When the measured radiation detection information is reduced to a set value, the radiation protection of the position is realized, the control system sends an instruction to the inspection operation robot, the inspection operation robot stops throwing shielding materials into the shielding section, and the protection operation is completed.
After the inspection operation robot puts shielding materials in the shielding protection chamber into the shielding section, the inspection operation robot cuts the bag open to increase the contact area between the lead particles and the inner surface of the shielding section; when the placement is completed, the operation is repeated until the radiation detection information falls to a set value.
After the fuel ball blockage problem is solved, the inspection operation robot continues to inspect and prepare for next protection; lead particles in the shielding section are put back into the shielding protection chamber, so that the effect of long-term protection is achieved.
In a specific example, the inspection operation robot needs to convey lead shielding materials and has working time limitation, 400Kg of lead shielding materials are conveyed in 8 hours in a primary plan, and the grabbing capacity and the running speed of the inspection operation robot influence the working efficiency. In this embodiment, the grabbing capacity of the inspection robot is 5 kg.
The transportation process of the lead bag comprises the following steps:
1) when the inspection operation robot detects and finds the specific position of the blockage of the radioactive substance in the pipeline, the inspection operation robot sends alarm information and immediately starts to execute operation;
2) the inspection operation robot moves to the position above the shielding protection room, and the lead bag is taken out from the inspection operation robot and moves to the position above the corresponding shielding section;
3) the lead bag is placed in the shielding section by the inspection operation robot, and the lead bag is cut open by the cutting tool, so that lead particles are guided into the shielding section;
4) the implementation is repeated, and when the lead particles fill the whole shielding section, the radiation source blocked in the pipeline can be prevented from emitting radioactive substances to the outside, so that the safety of the external environment is ensured;
5) then, the protection suit is worn by related workers and enters the plant, and the problem of pipeline blockage is further solved;
6) after the worker solves the problem, the inspection operation robot continues to perform inspection and prepare for next protection; lead shot in the shielding protection chamber is stored in a specific position, so that the effect of long-term protection can be achieved.
In this example, the lead pellets were packaged in individual packages of 5 kg/bag. After the quality of the lead bags is determined, three shielding sections can be estimated, the number of the lead bags needing to be transported at most is about 80, and the transportation time for completing one-time protection of the lead bags (lead shot) is about 6 minutes by taking the total transportation work time of 8 hours as an estimation standard.
The time required for one cycle is calculated as follows.
The length of operation guide rail is taken to be 10m, and the functioning speed of patrolling and examining work robot is 0.25m/s, then patrols and examines the operating time of work robot on the operation guide rail and be: 10 ÷ 0.25=40 s.
The telescopic speed of the telescopic sleeve is 0.1m/s, the limit stroke of the telescopic sleeve is about 650mm, and the time required by the telescopic sleeve is as follows: 0.65 ÷ 0.1=6.5 s.
Joint mechanical arm extension time: the joint mechanical arm keeps a folded state in non-working time, the joint movement speed of the joint mechanical arm is the same, each joint moves simultaneously when the joint mechanical arm is extended, and the tail end of the mechanical arm is kept to move downwards along the vertical direction; at the moment, the time when the main arm joint of the joint mechanical arm rotates by 90 degrees is the time when the tail end is completely stretched. The joint rotation angular velocity of the joint robot arm is taken to be 0.3rad/s, and the time required for the tail end of the joint robot arm to be fully extended is as follows: pi/2 ÷ 0.3 ≈ 5 s.
Similarly, the time required for retracting the joint mechanical arm is also 5 s.
The process to be passed in one cycle is as follows: the inspection operation robot reciprocates on the operation guide rail once; the inspection operation robot stretches out twice and retracts twice; the telescopic sleeve extends twice and retracts twice; the tail end of the inspection operation robot takes and discharges materials once (the expected time is 90 s); the total time required for one cycle is then: 40 × 2+6.5 × 4+5 × 4+90=216 s.
In summary, an operation cycle is about 216s, and a certain gap is reserved between the operation cycle and the specified time of 300s, so that the robot can be guaranteed to complete the task within 8 hours.
The method and the device can be used for detecting and protecting the blockage of the fuel ball of the high-temperature gas cooled reactor, reduce the risk and working strength of personnel irradiated by strong radioactivity, and reduce the risk of human error. The method and the device are favorable for ensuring safe operation and application of the high-temperature gas cooled reactor pipeline device, effectively promote and guarantee safe operation of the nuclear power device, reduce damage of a strong radiation environment to operation and maintenance personnel of the nuclear power station, and greatly improve the nuclear power operation guarantee capability.
The invention is not limited to the foregoing embodiments. The invention extends to any novel feature or any novel combination of features disclosed in this specification and any novel method or process steps or any novel combination of features disclosed.
Claims (5)
1. The method for detecting and protecting the blockage of the fuel ball of the high-temperature gas cooled reactor is characterized by comprising the following steps of:
(1) daily inspection
The control system sends out an instruction to enable the inspection operation robot to move along the operation guide rail, and the pipeline through which the fuel ball passes is inspected through the detection assembly on the inspection operation robot;
(2) jam protection
When the inspection operation robot detects that the radiation value of a pipeline through which the fuel ball passes at certain positions reaches a set threshold value, the inspection operation robot indicates that the fuel ball is blocked, and radiation detection information is transmitted to the control system;
the control system judges the received radiation detection information and determines whether the fuel ball is blocked at the corresponding position; when the control system determines that the fuel ball passes through the pipeline and is blocked, the control system sends an instruction to the inspection operation robot; the inspection operation robot puts shielding substances in the shielding protection chamber into a shielding section corresponding to the protection guide rail above the pipeline through which the fuel balls pass;
in the process that the inspection operation robot puts shielding materials into the shielding section, a detection assembly on the inspection operation robot continuously detects the position and transmits the obtained radiation detection information to a control system; when the measured radiation detection information is reduced to a set value, the radiation protection of the position is realized, the control system sends an instruction to the inspection operation robot, the inspection operation robot stops throwing shielding materials into the shielding section, and the protection operation is completed.
2. The method of claim 1, wherein the shielding substance is lead shot, or a bag containing lead shot.
3. The method according to claim 1 or 2, characterized in that when the shielding material is a bag filled with lead shot, after the inspection operation robot puts the shielding material in the shielding protection chamber into the shielding section, the inspection operation robot cuts the bag to increase the contact area between the lead shot and the inner surface of the shielding section; when the placement is completed, the operation is repeated until the radiation detection information falls to a set value.
4. The method according to claim 1 or 2, characterized in that after the fuel ball blockage problem is solved, the inspection operation robot continues to inspect to prepare for the next protection; lead particles in the shielding section are put back into the shielding protection chamber, so that the effect of long-term protection is achieved.
5. The method of claim 3, wherein after the fuel ball jam problem is resolved, the inspection robot continues to inspect in preparation for the next protection; lead particles in the shielding section are put back into the shielding protection chamber, so that the effect of long-term protection is achieved.
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| CN116137189A (en) * | 2023-02-24 | 2023-05-19 | 华能山东石岛湾核电有限公司 | Method and device for judging whether fuel element overtime is dropped |
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