High-temperature gas cooled reactor fuel loading and unloading system and fuel loading and unloading method

Abstract

The invention provides a high-temperature gas cooled reactor fuel loading and unloading system and a fuel loading and unloading method, and belongs to the technical field of nuclear power equipment.The high-temperature gas cooled reactor fuel loading and unloading system is provided with at least two circulation systems arranged side by side, and each circulation system comprises a blanking pipeline, a first storage tank, a lifting pipeline and a second storage tank which are communicated in sequence; the blanking pipeline is communicated with an outlet of a reactor, an inlet of the first storage tank is provided with a first isolating valve, an outlet of the second storage tank is provided with a second isolating valve, and the lifting pipeline is used for lifting a fuel element in the first storage tank into the second storage tank when the first isolating valve and the second isolating valve are closed; according to the fuel loading and unloading system of the high-temperature gas cooled reactor, the pressure in the lifting pipeline is reduced when the lifting pipeline lifts the fuel element, so that the circulating speed of the fuel element is remarkably increased, the problem that the operating power of the reactor is reduced due to insufficient fuel is avoided, and the economical efficiency of the high-temperature gas cooled reactor is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear power equipment, and in particular to a high temperature gas-cooled reactor fuel loading and unloading system and a fuel loading and unloading method. Background Art

[0002] In the high-temperature gas-cooled reactor fuel loading and unloading system, the core pressure is 7MPa. During the process of transporting fuel elements into the core, the lifting pipeline used to transport the fuel elements needs to be consistent with the pressure in the core.

[0003] However, when the fuel elements are lifted in the 7MPa lifting pipeline, vibrations are likely to occur, which increases the fuel element lifting time and even affects the full-load operation capacity of the high-temperature reactor. Specifically, when the fuel elements are lifted in the 4MPa lifting pipeline, about 300 fuel elements can be circulated per hour, and when the fuel elements are lifted in the 7MPa lifting pipeline, about 220 fuel elements can be circulated per hour.

[0004] Therefore, during normal operation, the fuel cycle capacity may be insufficient, requiring power reduction. Summary of the invention Therefore, the technical problem to be solved by the present invention is to overcome the power reduction defect caused by insufficient fuel circulation capacity during normal operation of a high temperature gas-cooled reactor fuel loading and unloading system in the prior art, thereby providing a high temperature gas-cooled reactor fuel loading and unloading system and a fuel loading and unloading method.

[0005] In order to solve the above technical problems, the present invention provides a high temperature gas-cooled reactor fuel loading and unloading system, which has at least two circulation systems arranged in parallel, and the circulation system comprises: a material dropping pipeline, a first storage tank, a lifting pipeline and a second storage tank connected in sequence; The material dropping pipeline is connected with the outlet of the reactor; The first storage tank is used to store the fuel elements output from the blanking pipeline, and the inlet of the first storage tank is provided with a first isolation valve; The second storage tank is arranged above the reactor, the outlet of the second storage tank is communicated with the inlet of the reactor, and the outlet of the second storage tank is provided with a second isolation valve; The lifting pipeline is used to lift the fuel elements in the first storage tank into the second storage tank when the first isolation valve and the second isolation valve are closed.

[0006] Optionally, the reactor is connected to the material-dropping pipeline via an integrated material-dropping device, and the material-dropping pipeline has at least two paths arranged in parallel, and the upper end of each path of the material-dropping pipeline is respectively connected to the integrated material-dropping device.

[0007] Optionally, the lower end of each of the material dropping pipelines is connected to the first storage tank via a crushed material separation device.

[0008] Optionally, there are at least two first storage tanks arranged in parallel, the inlet of each first storage tank is respectively connected to each of the crushing separation devices, and the first isolation valve is respectively arranged between the inlet of the first storage tank and the outlet of each of the crushing separation devices.

[0009] Optionally, a third isolation valve is provided at the outlet of the first storage tank. When the fuel element is transported into the first storage tank, the third isolation valve is closed first and then the first isolation valve is opened.

[0010] Optionally, a third unloading device is provided at the outlet of the first storage tank, and the outlet of the third unloading device is respectively connected to at least two unloading pipelines, each of the unloading pipelines is respectively connected to one of the lifting pipelines, and the third isolation valve is respectively provided on the connecting pipeline between the outlet of the third unloading device and each of the unloading pipelines.

[0011] Optionally, each of the unloading pipelines is connected to a burnup measurement and sorting device, and the burnup measurement and sorting device 10 has a spent fuel outlet.

[0012] Optionally, the lifting pipeline has at least two routes arranged in parallel, the second storage tank has at least two routes arranged in parallel, each of the second storage tanks is respectively connected to each route of the lifting pipeline, and a fourth isolation valve is respectively provided between the inlet of the second storage tank and each route of the lifting pipeline.

[0013] Optionally, the outlet of the second storage tank has a plurality of second isolation valves arranged in sequence.

[0014] The present invention provides a fuel loading and unloading method, which adopts a high temperature gas-cooled reactor fuel loading and unloading system according to any one of the above schemes, comprising the following steps: First, the fuel elements in the reactor are received through the first circulation system, and the first isolation valve at the inlet of the first storage tank in the first circulation system is opened to allow the fuel elements in the reactor to fall into the first storage tank; when the fuel elements in the first storage tank are full, the first isolation valve at the inlet of the first storage tank of the first circulation system is closed, and the fuel elements in the reactor are continuously received through the second circulation system; Then, the fuel elements are transferred from the first storage tank to the second storage tank in the first circulation system. During the transfer, the first isolation valve at the inlet of the first storage tank and the second isolation valve at the outlet of the second storage tank are first closed, and then the pressure in the lifting pipeline between the first storage tank and the second storage tank is reduced to be lower than the reactor pressure. Under this pressure, the fuel elements in the first storage tank are transferred to the second storage tank through the lifting pipeline; Finally, the fuel elements are transported toward the reactor through the first circulation system, and the second isolation valve on the outlet pipeline of the second storage tank is opened to make the pressure in the outlet pipeline of the second storage tank consistent with the reactor pressure. Under the action of gravity, the fuel elements in the second storage tank are transported to the reactor.

[0015] Optionally, when transporting fuel elements toward the reactor through the second storage tank, the third isolation valve at the outlet of the first storage tank is closed, and the fourth isolation valve at the inlet of the second storage tank is closed to keep the lifting pipeline closed.

[0016] The technical solution of the present invention has the following advantages: 1. The high-temperature gas-cooled reactor fuel loading and unloading system provided by the present invention reduces the pressure in the lifting pipeline when the fuel element is lifted by the lifting pipeline through the arrangement of the first storage tank, the second storage tank and the first isolation valve and the second isolation valve, thereby significantly improving the circulation speed of the fuel element by reducing the lifting pipeline pressure, thereby avoiding the problem of reducing the operating power of the reactor due to insufficient fuel, and improving the economy of the high-temperature gas-cooled reactor.

[0017] 2. The fuel loading and unloading method provided by the present invention has all the advantages of the above-mentioned high-temperature gas-cooled reactor fuel loading and unloading system because it adopts the above-mentioned high-temperature gas-cooled reactor fuel loading and unloading system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a front view of a specific implementation manner of a high temperature gas-cooled reactor fuel loading and unloading system provided in an embodiment of the present invention.

[0020] Description of reference numerals: 1. Reactor; 2. Integrated unloading device; 3. Unloading pipeline; 4. Crushed material separation device; 5. First storage tank; 6. Third unloading device; 7. Unloading pipeline; 8. Lifting pipeline; 9. Second storage tank; 10. Fuel consumption measurement and sorting device; 11. First isolation valve; 12. Second isolation valve; 13. Third isolation valve; 14. Fourth isolation valve; 15. Spent fuel outlet. DETAILED DESCRIPTION

[0021] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0023] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0025] like Figure 1As shown, a specific implementation of the high-temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment includes: two circulation systems arranged in parallel, each of which includes: a blanking pipeline 3, a first storage tank 5, a lifting pipeline 8 and a second storage tank 9 connected in sequence; the blanking pipeline 3 is connected to the outlet of the reactor 1; the first storage tank 5 is used to store the fuel elements output from the blanking pipeline 3, and the inlet of the first storage tank 5 is provided with a first isolation valve 11; the second storage tank 9 is arranged above the reactor 1, the outlet of the second storage tank 9 is connected to the inlet of the reactor 1, and the outlet of the second storage tank 9 is provided with a second isolation valve 12; the lifting pipeline 8 is used to lift the fuel elements in the first storage tank 5 into the second storage tank 9 when the first isolation valve 11 and the second isolation valve 12 are closed.

[0026] When in use, firstly, the first storage tank 5 of the first circulation system is used to receive the outlet discharge of the reactor 1. During this process, the fuel elements in the first storage tank 5 of the second circulation system are lifted to the second storage tank 9 of the circulation system through the lifting pipeline 8 at a relatively low pressure. Then, the second circulation system is switched to receive the fuel elements of the reactor 1. The first storage tank 5 of the second circulation system is used to receive the outlet discharge of the reactor 1. During this process, the fuel elements in the first storage tank 5 of the first circulation system are lifted to the second storage tank 9 of the circulation system through the lifting pipeline 8 at a relatively low pressure. In this way, the two circulation systems are alternately operated to realize continuous material replacement. Of course, the above description is not restrictive. In some alternative embodiments, the circulation system can also be provided with more circuits.

[0027] The high-temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment realizes that when the fuel element is lifted by the lifting pipeline 8, the pressure in the lifting pipeline 8 is reduced, through the arrangement of the first storage tank 5, the second storage tank 9, and the first isolation valve 11 and the second isolation valve 12, so that the circulation speed of the fuel element is significantly improved by reducing the pressure in the lifting pipeline 8, thereby avoiding the problem of reducing the operating power of the reactor 1 due to insufficient fuel, and improving the economy of the high-temperature gas-cooled reactor.

[0028] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, the reactor 1 is connected to the blanking pipeline 3 through the integrated unloading device 2, and the blanking pipeline 3 has two paths arranged in parallel, and the upper end of each path of the blanking pipeline 3 is respectively connected to the integrated unloading device 2. Through the integrated unloading device 2, the switching of the two-path circulation system is realized, and the two paths of the blanking pipeline 3 belong to the two-path circulation system. Through the separate unloading of the integrated unloading device 2, the switching of the two-path circulation system is realized.

[0029] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, the lower end of each of the drop pipes 3 is connected to the first storage tank 5 through a crushed material separation device 4. In this way, the crushed materials generated by the fuel elements in each circulation system during the transportation process can be separated and transported out through the crushed material separation device 4, so as to ensure the accuracy of the statistics during the transportation of the fuel elements.

[0030] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, there are two first storage tanks 5 arranged in parallel, and the inlet of each first storage tank 5 is respectively connected to each of the blanking pipelines 3, and a first isolation valve 11 is respectively arranged between the inlet of the first storage tank 5 and the outlet of each of the crushing separation devices 4. Through this arrangement, it is possible to transport the fuel elements in the blanking pipeline 3 of the first circulation system to the first storage tank 5 of the second circulation system, thereby avoiding the problem that the system cannot operate normally when a certain blanking pipeline 3 fails; specifically, by opening or closing a plurality of the first isolation valves 11, the switching between the first storage tank 5 and each of the blanking pipelines 3 is achieved. Of course, the above description is not restrictive. In some alternative embodiments, more first storage tanks 5 can also be arranged to achieve the parallel arrangement of more circulation systems.

[0031] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, the outlet of the first storage tank 5 is provided with a third isolation valve 13. When the fuel element is transported into the first storage tank 5, the third isolation valve 13 is closed first, and then the first isolation valve 11 is opened. Through this arrangement, the lifting pipeline 8 behind the third isolation valve 13 can be isolated, so that the low pressure state in the lifting pipeline 8 can be maintained when the fuel element is transported into the first storage tank 5. It avoids repeatedly reducing the pressure in the lifting pipeline 8, or reduces the time required to reduce the pressure in the lifting pipeline 8, and improves the time for performing the fuel element transfer step.

[0032] like Figure 1As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, the outlet of the first storage tank 5 is provided with a third unloading device 6, and the outlet of the third unloading device 6 is respectively connected to two unloading pipelines 7, each of which is respectively connected to one lifting pipeline 8, and the third isolation valve 13 is respectively provided on the connecting pipeline between the outlet of the third unloading device 6 and each of which is respectively connected to the lifting pipeline 8. When in use, by selecting to open or close some of the third isolation valves 13, the discharge of the first storage tank 5 is closed, so that one of the first storage tanks 5 receives the incoming material of the reactor 1, and the other first storage tank 5 transfers the fuel elements to the second storage tank 9. Of course, the above description is not restrictive. In some alternative embodiments, more unloading pipelines 7 can also be provided to achieve the parallel arrangement of more circulation systems.

[0033] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, each of the unloading pipelines 7 is connected to a burnup measurement and sorting device 10, and the burnup measurement and sorting device 10 is provided with a spent fuel outlet 15. Through burnup measurement, low-burnup components are re-entered into the core, and the spent fuel is transported to the spent fuel storage system. Specifically, the burnup measurement and sorting device 10 is used to measure and sort spent fuel components, and the spent fuel outlet 15 is used to dock with the spent fuel storage system.

[0034] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided by this embodiment, the lifting pipeline 8 has two routes arranged in parallel, and the second storage tank 9 has at least two arranged in parallel, each of the second storage tanks 9 is respectively connected to each of the lifting pipelines 8, and a fourth isolation valve 14 is respectively provided between the inlet of the second storage tank 9 and each of the lifting pipelines 8. Through this arrangement, the two lifting pipelines 8 can be used to transport fuel elements to multiple second storage tanks 9 respectively, so that when one of the lifting pipelines 8 fails, or when one of the second storage tanks 9 fails, the normal operation of the system can be not affected. Specifically, the switching can be performed by selecting to open or close the fourth isolation valve 14. Of course, the above description is not restrictive. In some alternative embodiments, the two second storage tanks 9 can also be respectively connected to only one of the lifting pipelines 8.

[0035] like Figure 1 As shown, in the high temperature gas-cooled reactor fuel loading and unloading system provided in this embodiment, the outlet of the second storage tank 9 has a plurality of second isolation valves 12 arranged in sequence. Through this arrangement, the reliability of system operation can be improved. Of course, the above description is not restrictive, and in some alternative embodiments, only one or two second isolation valves 12 can be arranged.

[0036] like Figure 1 As shown, this embodiment also provides a fuel loading and unloading method, using the above-mentioned high temperature gas-cooled reactor fuel loading and unloading system, including the following steps: First, the fuel elements in the reactor 1 are received through the first circulation system, the first isolation valve 11 at the inlet of the first storage tank 5 in the first circulation system is opened, and the third isolation valve 13 at the outlet of the first storage tank 5 is closed, so that the fuel elements in the reactor 1 fall into the first storage tank 5.

[0037] When the fuel elements in the first storage tank 5 are full, the first isolation valve 11 at the inlet of the first storage tank 5 of the first circulation system is closed, and the fuel elements in the reactor 1 continue to be received through the second circulation system.

[0038] Then, the fuel elements are transferred from the first storage tank 5 to the second storage tank 9 in the first circulation system, the third isolation valve 13 at the outlet of the first storage tank 5 of the first circulation system is opened, and the second isolation valve 12 at the outlet of the second storage tank 9 of the first circulation system is closed, and the first isolation valve 11 at the inlet of the first storage tank 5 of the first circulation system remains closed, so that the first circulation system is isolated from the reactor 1 by the first isolation valve 11 and the second isolation valve 12.

[0039] Then, the pressure in the lifting pipeline 8 between the first storage tank 5 and the second storage tank 9 of the first circulation system is reduced to be lower than the pressure of the reactor 1. Specifically, the pressure in the lifting pipeline can be 4 MPa. Under this pressure, the fuel elements in the first storage tank 5 are transported to the second storage tank 9 through the lifting pipeline 8.

[0040] Finally, the fuel elements are transported toward the reactor 1 through the first circulation system, and the second isolation valve 12 on the outlet pipeline of the second storage tank 9 is opened to make the pressure in the outlet pipeline of the second storage tank 9 consistent with the pressure of the reactor 1. Under the action of gravity, the fuel elements in the second storage tank 9 are transported to the reactor 1.

[0041] When the fuel elements are transported to the reactor 1 through the second storage tank 9, the third isolation valve 13 on the outlet pipeline of the first storage tank 5 is closed, and the fourth isolation valve 14 at the inlet of the second storage tank 9 is closed. In this way, the lifting pipeline 8 section of the first circulation system is closed, so that when the fuel elements are transferred next time, the time for reducing the pressure in the lifting pipeline 8 can be saved, thereby improving the transfer efficiency.

[0042] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the present invention.

Claims

1. A high temperature gas-cooled reactor fuel loading and unloading system, characterized in that: It has at least two circulation systems arranged in parallel, the circulation systems comprising: a material dropping pipeline (3), a first storage tank (5), a lifting pipeline (8) and a second storage tank (9) which are connected in sequence; The material discharge pipeline (3) is connected to the outlet of the reactor (1); The first storage tank (5) is used to store the fuel elements output from the material discharge pipeline (3), and the inlet of the first storage tank (5) is provided with a first isolation valve (11); The second storage tank (9) is arranged above the reactor (1), the outlet of the second storage tank (9) is connected to the inlet of the reactor (1), and the outlet of the second storage tank (9) is provided with a second isolation valve (12); The lifting pipeline (8) is used to lift the fuel elements in the first storage tank (5) into the second storage tank (9) when the first isolation valve (11) and the second isolation valve (12) are closed.

2. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 1, characterized in that: The reactor (1) is connected to the material discharge pipeline (3) via an integrated discharge device (2); the material discharge pipeline (3) has at least two paths arranged in parallel, and the upper end of each path of the material discharge pipeline (3) is respectively connected to the integrated discharge device (2).

3. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 2, characterized in that: The lower end of each of the material dropping pipelines (3) is connected to the first storage tank (5) via a crushed material separation device (4).

4. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 3, characterized in that: The first storage tanks (5) have at least two arranged in parallel, the inlet of each of the first storage tanks (5) is respectively connected to each of the crushing separation devices (4), and the first isolation valve (11) is respectively arranged between the inlet of the first storage tank (5) and the outlet of each of the crushing separation devices (4).

5. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 1, characterized in that: The outlet of the first storage tank (5) is provided with a third isolation valve (13). When the fuel element is transported into the first storage tank (5), the third isolation valve (13) is first closed and then the first isolation valve (11) is opened.

6. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 5, characterized in that: The outlet of the first storage tank (5) is provided with a third unloading device (6), and the outlet of the third unloading device (6) is respectively connected to at least two unloading pipelines (7), each of the unloading pipelines (7) is respectively connected to one of the lifting pipelines (8), and the third isolation valve (13) is respectively provided on the connecting pipeline between the outlet of the third unloading device (6) and each of the unloading pipelines (7).

7. The high temperature gas-cooled reactor fuel loading and unloading system according to claim 6, characterized in that: Each of the discharge pipelines (7) is connected to a burnup measurement and sorting device (10), and the burnup measurement and sorting device (10) has a spent fuel outlet (15).

8. The high temperature gas-cooled reactor fuel loading and unloading system according to any one of claims 1 to 7, characterized in that: The lifting pipeline (8) has at least two paths arranged in parallel, and the second storage tank (9) has at least two paths arranged in parallel, each of the second storage tanks (9) is respectively connected to each path of the lifting pipeline (8), and a fourth isolation valve (14) is respectively provided between the inlet of the second storage tank (9) and each path of the lifting pipeline (8).

9. The high temperature gas-cooled reactor fuel loading and unloading system according to any one of claims 1 to 7, characterized in that: The outlet of the second storage tank (9) has a plurality of second isolation valves (12) arranged in sequence.

10. A fuel loading and unloading method, characterized in that: The high temperature gas-cooled reactor fuel loading and unloading system according to any one of claims 1 to 9 comprises the following steps: Firstly, the fuel elements in the reactor (1) are received through the first circulation system, and the first isolation valve (11) at the inlet of the first storage tank (5) in the first circulation system is opened, so that the fuel elements in the reactor (1) fall into the first storage tank (5); when the fuel elements in the first storage tank (5) are full, the first isolation valve (11) at the inlet of the first storage tank (5) in the first circulation system is closed, and the fuel elements in the reactor (1) continue to be received through the second circulation system; Then, the fuel elements are transferred from the first storage tank (5) to the second storage tank (9) in the first circulation system. During the transfer, the first isolation valve (11) at the inlet of the first storage tank (5) and the second isolation valve (12) at the outlet of the second storage tank (9) are first closed, and then the pressure in the lifting pipeline (8) between the first storage tank (5) and the second storage tank (9) is reduced to be lower than the pressure of the reactor (1). Under this pressure, the fuel elements in the first storage tank (5) are transferred to the second storage tank (9) through the lifting pipeline (8); Finally, the fuel elements are transported toward the reactor (1) through the first circulation system, and the second isolation valve (12) on the outlet pipeline of the second storage tank (9) is opened, so that the pressure in the outlet pipeline of the second storage tank (9) is consistent with the pressure of the reactor (1), and the fuel elements in the second storage tank (9) are transported to the reactor (1) under the action of gravity.

11. The fuel loading and unloading method according to claim 10, characterized in that: When the fuel elements are transported toward the reactor (1) through the second storage tank (9), the third isolation valve (13) at the outlet of the first storage tank (5) is closed, and the fourth isolation valve (14) at the inlet of the second storage tank (9) is closed to keep the lifting pipeline (8) closed.

Images