Control driving method and system of nuclear reactor control rod driving system

Abstract

The invention discloses a control driving method and system of a nuclear reactor control rod driving system, and relates to the field of nuclear power stations. The method comprises the following steps: arranging a lifting cabinet for a lifting coil of a driving mechanism, and arranging an independent transmission holding cabinet for a transmission coil and a holding coil of the driving mechanism of each rod group; a one-driving-four-driving-mechanism control mode is adopted, and one set of control driving power supply provides time sequence current for similar coils of four driving mechanisms at the same time so as to drive the driving mechanisms to operate. The method can be applied to various types of pressurized water reactor nuclear power plant control rod driving systems and equipment, and the application range is wide; the system topology can be greatly simplified, the equipment scale is reduced, the stability and reliability of system operation and maintenance in the whole life period are improved, the effective function utilization rate of the equipment is improved, and remarkable economic benefits are achieved.

Description

Technical Field

[0001] The present invention relates to the field of nuclear power plants, and particularly to a control driving method and system for a control rod drive system of a nuclear reactor. Background Art

[0002] The reactor control rod drive system of a nuclear power plant consists of a control rod drive mechanism and a rod control system. The rod control system is responsible for logical control and directly provides timing current for the drive mechanism, so as to realize the lifting, insertion and holding of the control rod; when an emergency shutdown of the nuclear power plant is required, the current of the drive mechanism can be quickly and effectively cut off, so that the control rod bundle falls into the reactor core under the action of gravity.

[0003] The currently used control driving mode of the drive mechanism is "one-to-one", that is, each drive mechanism is controlled and driven by a set of independent rod control power supply circuits, and the three coils (lifting coil, transfer coil, holding coil) of each drive mechanism are controlled by independent control driving modules for power supply. Taking the third-generation nuclear power high-power version reactor type as an example, that is, 69 drive mechanisms require a total of 207 sets (69×3) of independent control driving modules. When the reactor of the nuclear power plant is operating, a rod control power supply cabinet controls the simultaneous operation of four bundles of a single subgroup. Under extreme operating conditions, no more than three rod groups operate simultaneously (that is, in the most extreme case, the shutdown rod group SA (9 bundles) and the power rod groups N2 / N1 (16 bundles) overlap and operate), and most of the other rod groups are in a stationary state (held at a certain height). At this time, as many as 88 sets ((69 - 25)×2) of control driving modules are in a state of no current output.

[0004] Therefore, adopting the "one-to-one" control driving mode and respectively configuring independent rod control power supply circuits for the drive mechanism coils of each control rod bundle will make the system equipment scale large, some modules in the equipment are in a state of no current output for a long time, the effective function utilization rate of the equipment is low, and it is impossible to conduct a comprehensive fault diagnosis on the modules that have not been operating for a long time without moving the rods, and the maintainability is not high.

[0005] In view of this, the present application is specifically proposed. Summary of the Invention

[0006] The technical problem to be solved by the present invention is that the existing reactor control rod drive system of a nuclear power plant adopts the "one-to-one" drive mechanism control method (that is, a set of control driving power supply provides timing current for the coils of one drive mechanism to drive the drive mechanism to operate), and respectively configures independent rod control power supply circuits for the drive mechanism coils of each control rod bundle, which will make the system equipment scale large, some modules in the equipment are in a state of no current output for a long time, the effective function utilization rate of the equipment is low, and it is impossible to conduct a comprehensive fault diagnosis on the modules that have not been operating for a long time without moving the rods, and the maintainability is not high.

[0007] The object of the present invention is to provide a control driving method and system for a control rod drive system of a nuclear reactor. The present invention adopts a "one driving four" driving mechanism control method (that is, a set of control driving power supply provides timing current for the same type of coils of four driving mechanisms to drive the driving mechanisms to operate), and conducts overall framework optimization and equipment control function optimization design of the rod control system, as well as redundant control design of the driving structure, etc. The present invention can be applied to the control rod drive systems and equipment of various types of pressurized water reactor nuclear power plants, with a wide range of applications; it can greatly simplify the system topology, reduce the equipment scale, improve the stability and reliability of system operation and maintenance during the whole life cycle, and increase the effective function utilization rate of the equipment, having significant economic benefits.

[0008] The present invention is realized through the following technical solutions:

[0009] In the first aspect, the present invention provides a control driving method for a control rod drive system of a nuclear reactor, and the method includes:

[0010] A lifting cabinet is provided for the lifting coils of the driving mechanism, and independent preservation and transfer cabinets are provided for the transfer coils and holding coils of the driving mechanisms of each rod group.

[0011] Adopt the "one driving four" driving mechanism control method to realize that a set of control driving power supply simultaneously provides timing current for the same type of coils of four driving mechanisms to drive the driving mechanisms to operate.

[0012] Further, adopting the "one driving four" driving mechanism control method to realize that a set of control driving power supply simultaneously provides timing current for the same type of coils of four driving mechanisms includes:

[0013] Provide timing current for the four lifting coils of the same subgroup through the three-phase half-wave controlled rectifier module in the lifting cabinet;

[0014] Provide timing current for the four transfer holding and / or holding coils of the same subgroup through the three-phase half-wave controlled rectifier module in the preservation and transfer cabinet.

[0015] In the second aspect, the present invention further provides a control driving system for a control rod drive system of a nuclear reactor, and the system includes a first lifting cabinet and several preservation and transfer cabinets;

[0016] The first lifting cabinet is used to provide timing current for the lifting coils of two groups of driving mechanisms docked, with four driving mechanisms in each group, a total of eight driving mechanisms;

[0017] The preservation and transfer cabinet is used to provide timing current for the transfer coils and / or holding coils of two groups of driving mechanisms docked, with four driving mechanisms in each group, a total of eight driving mechanisms.

[0018] Further, the system further includes a second lifting cabinet, and the second lifting cabinet has the same structure as the first lifting cabinet;

[0019] The second lifting cabinet and the first lifting cabinet are redundant devices for each other. When one of them fails, the second lifting cabinet and the first lifting cabinet are switched through contactors.

[0020] Furthermore, both the first lifting cabinet and the second lifting cabinet use a time-division multiplexing method to provide timing current for the lifting coils of all drive mechanisms.

[0021] Furthermore, a single-step correction single-selection module is provided in both the first lifting cabinet and the second lifting cabinet. The single-step correction single-selection module includes four single-selection power switches;

[0022] The four single-selection power switches are used to connect or disconnect from the corresponding lifting coils respectively, providing timing current for the specified single or multiple lifting coils, and realizing the operation of locking single or multiple control rod bundles in the single-step correction mode.

[0023] Furthermore, the first lifting cabinet includes a first sub-group unit and a first second sub-group unit with the same structure; each preservation and transmission cabinet includes a second sub-group unit and a second second sub-group unit with the same structure;

[0024] The first sub-group unit is connected to the second sub-group unit, and provides timing current for the corresponding coils of a one-to-four drive mechanism through a three-phase half-wave controlled rectifier module and a selection switch module;

[0025] The first second sub-group unit is connected to the second second sub-group unit, and provides timing current for the corresponding coils of a one-to-four drive mechanism through a three-phase half-wave controlled rectifier module and a selection switch module.

[0026] Furthermore, fuse buses are provided in the main circuits of the second sub-group unit and the second second sub-group unit of the preservation and transmission cabinet, and the fuse buses are connected; the phase lines A, B, and C of each sub-group unit are connected to the fuse buses, the fuse buses are connected to four holding coils, and the holding coils are connected to the neutral line N;

[0027] The fuse buses are used to monitor the current of the holding coils. When the current value of the holding coils drops by more than the set threshold due to reasons such as the loss of power of the upstream power supply or the failure of the control drive unit of the local cabinet, the fuse bus power switch is closed (i.e., turned on), and the current is provided by the main circuit of the holding coils of another sub-group unit of the preservation and transmission cabinet to prevent the control rod from dropping.

[0028] Furthermore, for the rod group with 8 control rods, the second sub-group unit and the second second sub-group unit of the preservation and transmission cabinet are interconnected by fuse buses, forming a redundant fuse bus form;

[0029] For the rod group with 4 control rods and the rod group with only 1 control rod, the fuse buses are interconnected to form a redundant fuse bus form.

[0030] Further, the first sub-group unit and the second sub-group unit in the first lifting cabinet are powered by independent power sources;

[0031] The second sub-group unit and the second second sub-group unit in the preservation and transmission cabinet are powered by independent power sources.

[0032] Further, the main power supply for the control drive main circuit of the transfer coil and the holding coil in the preservation and transmission cabinet adopts a cross-power supply method.

[0033] Further, for the first lifting cabinet and the preservation and transmission cabinet of the system, when the upstream power supply input is AC, three-phase half-wave controlled rectification is directly performed through a three-phase half-wave controlled rectification module;

[0034] When the upstream power supply input is DC, direct-AC conversion is performed through an interface conversion module, isolated and voltage-boosted by a transformer, and then three-phase half-wave controlled rectification is performed through a three-phase half-wave controlled rectification module.

[0035] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0036] 1. For the control drive method and system of a nuclear reactor control rod drive system of the present invention, adopting the "one driving four" drive mechanism control method of the present invention, 207 sets of control drive modules in traditional equipment can be optimized to 40 sets. The present invention greatly reduces the number of control drive modules, can significantly simplify the system topology, reduce the equipment scale, and improve the stability and reliability of system operation and maintenance during the whole life cycle, with remarkable economic benefits. The present invention can be applied to the control rod drive systems and equipment of various types of pressurized water reactor nuclear power plants, with a wide range of applications, and effectively improves the availability, reliability and economy of the rod control system equipment.

[0037] 2. For the control drive method and system of a nuclear reactor control rod drive system of the present invention, to meet the rod bundle locking function in the out-of-step correction mode, a single-selection power switch is respectively set for the corresponding four lifting coils in each lifting cabinet to form an out-of-step correction single-selection module, so as to ensure that the normal operation of other rod bundles is not affected when a single control rod bundle or multiple control rod bundles are locked.

[0038] 3. For the control drive method and system of a nuclear reactor control rod drive system of the present invention, to further improve the reliability and maintainability of the rod control system equipment, an insurance busbar design is added to the main circuit, and the control drive main circuits of the holding coils for sub-group 1 (i.e., the second sub-group unit) and sub-group 2 (i.e., the second second sub-group unit) in the preservation and transmission cabinet are designed for cross-backup with each other, so as to prevent the current holding coil from losing power due to a single set of holding main circuit failure. In addition, the power supply of a single preservation and transmission cabinet can be cut off according to the actual operation and maintenance requirements on site for in-depth maintenance.

[0039] 4. The control driving method and system of a control rod drive system of the present invention design diversified power interfaces. The upstream power supply system can be powered by three-phase AC input or DC power input, thereby effectively improving the reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, form a part of this application, and do not limit the embodiments of the present invention. In the drawings:

[0041] Figure 1 is the overall topological architecture diagram of the control driving system of the present invention;

[0042] Figure 2 is a schematic diagram of a one-to-four drive mechanism control method of the present invention;

[0043] Figure 3 is a schematic diagram of the fuse bus design of the present invention;

[0044] Figure 4 is a schematic diagram of the cross-power supply design of the power supply of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] In the following, the term "comprising" or "may comprise" that can be used in various embodiments of the present invention indicates the presence of the functions, operations, or elements of the present invention, and does not limit the addition of one or more functions, operations, or elements. In addition, as used in various embodiments of the present invention, the terms "comprising", "having", and their cognates are only intended to represent specific features, numbers, steps, operations, elements, components, or combinations of the foregoing items, and should not be construed as first excluding the existence or addition of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing items.

[0046] In various embodiments of the present invention, the expression "or" or "at least one of A or / and B" includes any combination or all combinations of the words listed simultaneously. For example, the expression "A or B" or "at least one of A or / and B" may include A, may include B, or may include both A and B.

[0047] In various embodiments of the present invention, expressions (such as "first", "second", etc.) used may modify various constituent elements in the various embodiments, but do not limit the corresponding constituent elements. For example, the above expressions do not limit the order and / or importance of the elements. The above expressions are only for the purpose of distinguishing one element from other elements. For example, the first user device and the second user device indicate different user devices, although both are user devices. For example, without departing from the scope of the various embodiments of the present invention, the first element may be referred to as the second element, and similarly, the second element may also be referred to as the first element.

[0048] It should be noted that: if it is described that one constituent element is "connected" to another constituent element, the first constituent element may be directly connected to the second constituent element, and a third constituent element may be "connected" between the first constituent element and the second constituent element. On the contrary, when one constituent element is "directly connected" to another constituent element, it can be understood that there is no third constituent element between the first constituent element and the second constituent element.

[0049] The terms used in the various embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the various embodiments of the present invention. As used herein, the singular form is intended to also include the plural form, unless the context clearly indicates otherwise. Unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the various embodiments of the present invention pertain. The terms (such as those defined in a commonly used dictionary) will be interpreted as having the same meaning as the contextual meaning in the relevant technical field and will not be interpreted as having an idealized meaning or an overly formal meaning, unless clearly defined in the various embodiments of the present invention.

[0050] To make the objectives, technical solutions, and advantages of the present invention more clear and understandable, the present invention will be further described in detail below in conjunction with embodiments and drawings. The illustrative embodiments and descriptions of the present invention are only for explaining the present invention and do not serve as a limitation to the present invention.

[0051] The existing reactor control rod drive system of nuclear power plants adopts a "one-for-one" drive mechanism control method (that is, a set of control drive power supplies provides timing current for the coil of one drive mechanism to drive the drive mechanism to operate), and independent rod control power supply circuits are configured for the coil of the drive mechanism of each control rod bundle respectively, which will result in a large scale of system equipment. Some modules in the equipment are in a state of no current output for a long time, the effective function utilization rate of the equipment is low, and a full-range fault diagnosis cannot be carried out on the modules that have not been operating for a long time without moving the rods, and the maintainability is not high.

[0052] In view of the above problems, the present invention designs a control drive method and system for a nuclear reactor control rod drive system. The present invention makes technical innovations in aspects such as optimizing the design of the power drive mode of the drive mechanism, optimizing the overall architecture of the rod control system and optimizing the design of the equipment control function, designing redundant control of the drive structure, and diversifying the power supply interface, so as to effectively improve the availability, reliability and economy of the rod control system equipment.

[0053] The overall topological structure of the control drive system of the present invention is shown in FIG. Figure 1 As shown, the main innovations include the following:

[0054] (1) Optimization design of the power supply driving mode of the driving mechanism

[0055] The present invention adopts a "one belt four" drive mechanism control method (such as Figure 2 As shown), a set of control drive power supplies provides timing current for similar coils of four drive mechanisms to drive the drive mechanisms to operate; this control method reduces the number of control drive modules in a single power cabinet to one-fourth of the previous traditional control drive method.

[0056] In addition, the traditional dual-set power switch control topology is optimized to a single-set power switch control topology. Figure 1 It can be seen that after the ABC three-phase power supply is input, it is connected to the drive mechanism coil through a single set of three-phase half-wave controlled rectifier modules (power switch topology); while the traditional one requires two sets of such power switch topologies. The present invention reduces the complexity of the circuit and improves reliability.

[0057] (2) Optimization of the overall structure of the rod control system and optimization design of the equipment control function

[0058] On the basis of adopting the "one belt four" drive mechanism control method, the control drive modules used for lifting are functionally centralized and allocated using a time-sharing multiplexing design method, that is, a lifting cabinet specifically designed for the driving mechanism lifting coil is designed.

[0059] In order to prevent all corresponding rod groups from failing to operate when a time-sharing multiplexing lifting cabinet fails, the present invention provides two sets of redundant power supply lifting cabinets to switch to the hot standby lifting cabinet when a single set of lifting cabinet fails.

[0060] To ensure that each rod group can freely choose which one to act on when in different operating states, the present invention provides an independent power supply cabinet, i.e., a transmission cabinet, for the transmission coil and holding coil of the driving mechanism of each rod group (a total of 9 rod groups).

[0061] To meet the requirements of the rod bundle locking function in the out-of-step correction mode (especially the overlapping operation of the power rod group in the out-of-step correction state 2), a single-selection power switch will be set for each of the corresponding four lifting coils in each lifting cabinet to form an out-of-step correction single-selection module, so as to ensure that the normal operation of other rod bundles is not affected when one or more control rod bundles are locked.

[0062] (3) Redundant control of the drive mechanism

[0063] To further improve the reliability and maintainability of the rod control system equipment, an insurance busbar design is added to the main circuit (such as Figure 3 ), and the control drive main circuits of the holding coils for subgroup 1 (i.e., the second first subgroup unit) and subgroup 2 (i.e., the second second subgroup unit) in the protection and transmission cabinet are designed for cross-backup, so as to prevent the power loss of the current holding coil caused by the failure of a single set of holding main circuits. In addition, the power supply of a single protection and transmission cabinet can be cut off according to the actual on-site operation and maintenance requirements for in-depth maintenance.

[0064] For the rod group with 8 control rods, the insurance busbars are interconnected between subgroup 1 (i.e., the second first subgroup unit) and subgroup 2 (i.e., the second second subgroup unit) to form a redundant insurance busbar form; in addition, the rod group with 4 control rods and the rod group with only 1 control rod are interconnected with the insurance busbars to form a redundant insurance busbar form.

[0065] (4) Diversified power supply interfaces

[0066] Both subgroup 1 (i.e., the first first subgroup unit) and subgroup 2 (i.e., the first second subgroup unit) in the lifting cabinet, and subgroup 1 (i.e., the second first subgroup unit) and subgroup 2 (i.e., the second second subgroup unit) in the protection and transmission cabinet are powered by two independent power sources, and the power sources of the transmission coil and the holding coil control drive main circuits in the protection and transmission cabinet are cross-powered (such as Figure 4 ), thereby reducing the risk of accidental rod drop of the control rod due to equipment failure, and effectively improving the reliability of the system.

[0067] When the upstream power supply system is three-phase AC input (RAM motor form), three-phase half-wave controlled rectification is directly performed through power switch devices (this state is industrial frequency).

[0068] When the upstream power supply system is DC power input (static rod power form), a corresponding interface power conversion module is designed for each power cabinet to achieve DC-AC conversion, then isolation and voltage boost are performed through a transformer, and finally three-phase half-wave controlled rectification is performed by power switch devices (the frequency is adjustable in this state).

[0069] Embodiment 1

[0070] A control drive method for a control rod drive system of a nuclear reactor according to the present invention, the method comprising:

[0071] A lifting cabinet is provided for the lifting coil of the drive mechanism, and independent protection and transmission cabinets are provided for the transmission coil and the holding coil of the drive mechanism of each rod group.

[0072] Adopt a one-driving-four drive mechanism control method to enable a set of control drive power supply to provide timing current for the same type of coils of four drive mechanisms simultaneously, so as to drive the operation of the drive mechanism.

[0073] As a further implementation, adopt a one-driving-four drive mechanism control method to enable a set of control drive power supply to provide timing current for the same type of coils of four drive mechanisms simultaneously, including:

[0074] Provide timing current for four lifting coils of the same subgroup through the three-phase half-wave controlled rectifier module in the lifting cabinet;

[0075] Provide timing current for four transmission holding and / or holding coils of the same subgroup through the three-phase half-wave controlled rectifier module in the protection and transmission cabinet.

[0076] The present invention mainly adopts a one-driving-four drive mechanism control method (such as Figure 2 ), reducing the number of control drive modules of a single power cabinet to one-fourth of the previous traditional control drive method.

[0077] Embodiment 2

[0078] The difference between this embodiment and Embodiment 1 is that the present invention further provides a control drive system for a nuclear reactor control rod drive system. This system is an architecture designed based on the control drive method of a nuclear reactor control rod drive system in Embodiment 1, such as Figure 1 shown, Figure 1 is the overall topological architecture diagram of the control drive system of the present invention; this system includes a first lifting cabinet (lifting cabinet 1), a second lifting cabinet (lifting cabinet 2) and several protection and transmission cabinets (including protection and transmission cabinets 1 to 9); the lifting cabinet 2 has the same structure as the lifting cabinet 1, and the lifting cabinet 2 and the lifting cabinet 1 are redundant devices for each other. When one of them fails, the lifting cabinet 2 and the lifting cabinet 1 are switched through a contactor;

[0079] The first lifting cabinet is used to provide timing current for the lifting coils of two sets of docked drive mechanisms, with four drive mechanisms in each group, a total of eight drive mechanisms; the first lifting cabinet includes a first subgroup unit (subgroup 1 unit) and a first second subgroup unit (subgroup 2 unit) with the same structure; each sub-unit supplies power to the lifting coils of a group of 4 drive mechanisms (one-driving-four drive mechanism control method). When it is necessary to generate current on the corresponding lifting coil, the selection switch module in the corresponding protection and transmission cabinet is controlled by the upstream logic control total system to close (i.e., turn on), forming a current path.

[0080] The preservation and transmission cabinet is used to provide timing current for the transfer coils and / or holding coils of two sets of docking drive mechanisms, with four drive mechanisms in each set and a total of eight drive mechanisms; each preservation and transmission cabinet includes a second first subgroup unit (subgroup 1 unit SA1) and a second second subgroup unit (subgroup 2 unit SA2) with the same structure; each subunit supplies power to the transfer coils and holding coils of a set of 4 drive mechanisms (one - with - four drive mechanism control mode). A reactor with 69 control rods can be divided into 18 subgroups, which are exactly distributed into 9 preservation and transmission cabinets to provide timing current for their transfer coils and holding coils respectively;

[0081] The first first subgroup unit of the first lifting cabinet is connected and cooperates with the second first subgroup unit of the preservation and transmission cabinet to supply power to the drive mechanisms belonging to the subgroup 1 unit, that is, to provide timing current for the corresponding coils of the one - with - four drive mechanisms through the three - phase half - wave controlled rectifier module and the selection switch module; the first second subgroup unit of the first lifting cabinet is connected and cooperates with the second second subgroup unit of the preservation and transmission cabinet to supply power to the drive mechanisms belonging to the subgroup 2 unit, that is, to provide timing current for the corresponding coils of the one - with - four drive mechanisms through the three - phase half - wave controlled rectifier module and the selection switch module.

[0082] The first lifting cabinet and the preservation and transmission cabinet are uniformly controlled by the upstream logic control total system to coordinate the work of the three - phase half - wave controlled rectifier module and the selection switch module in the first lifting cabinet and the cabinet, and finally provide the timing current that meets the requirements of the moving rod for the drive mechanism coils.

[0083] In this embodiment, both the first lifting cabinet and the second lifting cabinet use the time - sharing multiplexing method to provide timing current for the lifting coils of all drive mechanisms.

[0084] In this embodiment, an out - of - step correction single - selection module is provided in both the first lifting cabinet and the second lifting cabinet, and the out - of - step correction single - selection module includes four single - selection power switches;

[0085] The four single - selection power switches are used to connect or disconnect with the corresponding lifting coils respectively to provide timing current for specific single or multiple lifting coils, so as to realize that single or multiple control rod bundles can be locked during the out - of - step correction mode, and the normal operation of other rod bundles is not affected when single or multiple rod bundles are locked.

[0086] In this embodiment, fuse buses are provided in the main circuits of the second first subgroup unit and the second second subgroup unit of the preservation and transmission cabinet, and the fuse buses are connected; the phase lines A, B, and C of each subgroup unit are connected to the fuse bus, the fuse bus is connected to four holding coils, and the holding coils are connected to the neutral line N;

[0087] The insurance busbar is used to monitor the current of the holding coil. When the upstream power supply loses power or the control drive unit of the local cabinet fails, etc., resulting in the holding coil current value dropping by more than the set threshold, the insurance busbar unit is controlled to work through the upstream logic control master system, that is, the insurance busbar power switch is closed (i.e., connected), so that the holding coil connected to this faulty unit is powered by the holding coil main circuit of another subgroup unit in this protection and transmission cabinet, preventing the control rod from dropping.

[0088] In this embodiment, for the rod group with 8 control rods, the insurance busbars are interconnected between the second first subgroup unit and the second second subgroup unit of the protection and transmission cabinet, forming a redundant insurance busbar form with each other;

[0089] The insurance busbars of the rod group with 4 control rods and the rod group with only 1 control rod are interconnected to form a redundant insurance busbar form with each other.

[0090] In this embodiment, the first first subgroup unit and the first second subgroup unit in the first lifting cabinet are powered by independent power supplies;

[0091] The second first subgroup unit and the second second subgroup unit in the protection and transmission cabinet are powered by independent power supplies.

[0092] In this embodiment, the power supplies of the control drive main circuits of the transfer coil and the holding coil in the protection and transmission cabinet adopt a cross-power supply method.

[0093] In this embodiment, in the first lifting cabinet and the protection and transmission cabinet of the system, when the input of the upstream power supply is AC, three-phase half-wave controlled rectification is directly carried out through the three-phase half-wave controlled rectification module (this state is the power frequency);

[0094] When the input of the upstream power supply is DC, direct-to-AC conversion is carried out through the interface conversion module, and isolation and voltage boost are carried out by the transformer, and then three-phase half-wave controlled rectification is carried out through the three-phase half-wave controlled rectification module (the frequency is adjustable in this state).

[0095] Figure 2 It is a one-to-four drive mechanism control method. In a single lifting cabinet or a single three-phase half-wave controlled rectification module in the protection and transmission cabinet, 4 lifting coils or transfer / holding coils of the same subgroup are supplied with power in parallel, so that a set of control drive circuit can provide timing current for 4 drive mechanism similar coils at the same time.

[0096] As shown in Figure 3, it is a schematic design diagram of the fuse busbar. The fuse busbar circuit monitors the current of the holding coil. When the upstream power supply loses power or the control drive unit of the local cabinet fails, etc., resulting in the current value of the holding coil dropping by more than the set threshold, the fuse busbar power switch is closed (i.e., turned on), and the current is provided by the main circuit of the holding coil of another subgroup unit of the cabinet to prevent the control rod from dropping. Specifically, the threshold setting of the fuse busbar is related to the current magnitude when the CRDM holding claw opens, and the threshold is set to 0.5A.

[0097] Figure 4 It is a schematic design diagram of cross-power supply for the power supply. The power supply adopts the cross-power supply method, that is, the two-way power supplies of each protection and transmission cabinet are divided into two paths after entering the cabinet. One path supplies power to the holding coil of its own subgroup unit, and the other path supplies power to the transfer coil of the adjacent subgroup unit.

[0098] Taking the third-generation nuclear power high-power version reactor type as an example, if the traditional "one-to-one" drive mechanism control method is adopted, that is, a total of 207 sets (69×3) of independent control drive modules are required for 69 drive mechanisms. When the nuclear power plant reactor is operating, one rod control power cabinet controls four bundles of a single subgroup to operate simultaneously. Under extreme operating conditions, no more than three rod groups will operate simultaneously (that is, in the most extreme case, the shutdown rod group SA (9 bundles) and the power rod groups N2 / N1 (16 bundles) overlap and operate), and most of the other rod groups are in a stationary state (held at a certain height). At this time, as many as 88 sets ((69 - 25)×2) of control drive modules are in a state of no current output.

[0099] While adopting the "one-to-four" drive mechanism control method of the present invention, that is, a total of 40 sets (9×2×2 + 4) of control drive modules are required for 69 drive mechanisms. Specifically, through the above design, 69 sets of control drive modules for lifting in the traditional design can be optimized and concentrated into 2 sets of redundant modules (in a single set, module 1 is used for lifting of subgroup 1 unit, and module 2 is used for lifting of subgroup 2 unit), and only 4 sets (2×2) of corresponding lifting control drive modules are needed. In addition, cabinets designed to supply power to the transfer coil and the holding coil are provided, with one cabinet corresponding to each rod group (the double cabinets are arranged back to back, half for subgroup 1 and half for subgroup 2), that is, 9 protection and transmission cabinets, and only 36 sets (9×2×2) of corresponding transfer / holding control drive modules are needed. Through the above optimization design, 207 sets of control drive modules in the traditional equipment can be optimized into 40 sets (36 + 4).

[0100] It can be seen from this that the present invention greatly reduces the number of control drive modules, can significantly simplify the system topology, reduce the equipment scale, improve the stability and reliability of system operation and maintenance during the whole life cycle, and has significant economic benefits. The present invention can be applied to the control rod drive systems and equipment of various types of pressurized water reactor nuclear power plants, has a wide range of applications, and effectively improves the availability, reliability and economy of the rod control system equipment.

[0101] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0102] The present application is described with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to the embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, as well as the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing devices to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing devices generate means for implementing the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0103] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0104] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, so that the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one Figure 1 flow or multiple flows and / or blocks Figure 1 or multiple blocks.

[0105] The specific embodiments described above further elaborate on the objectives, technical solutions, and beneficial effects of the present invention. It should be understood that the above are only specific embodiments of the present invention and are not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A control driving method for a nuclear reactor control rod drive system, characterized in that: The method includes: A lifting cabinet is provided for the lifting coil of the driving mechanism, and an independent transmission cabinet is provided for the transmission coil and the holding coil of the driving mechanism of each rod group; A one-belt four-drive mechanism control method is adopted to realize that one set of control drive power supply can provide timing current for the same type of coils of four drive mechanisms at the same time to drive the drive mechanisms to operate.

2. A control and driving method for a nuclear reactor control rod drive system according to claim 1, characterized in that: Adopting one belt four drive mechanism control mode, a set of control drive power supply can provide timing current for the same type of coils of four drive mechanisms at the same time, including: The three-phase half-wave controllable rectifier module in the lifting cabinet provides a timing current for four lifting coils of the same subgroup; The three-phase half-wave controllable rectifier module in the transmission and protection cabinet provides timing current for four transmission holding and / or holding coils of the same subgroup.

3. A control drive system of a control drive method for a nuclear reactor control rod drive system according to any one of claims 1 to 2, characterized in that: The system includes a first lifting cabinet and a plurality of transmission-preserving cabinets; The first lifting cabinet is used to provide timing current for the lifting coils of two connected groups of drive mechanisms, each group of four drive mechanisms, a total of eight drive mechanisms; The transmission cabinet is used to provide timing current for the transmission coils and / or holding coils of two connected groups of drive mechanisms, each group of four drive mechanisms, a total of eight drive mechanisms.

4. The control drive system according to claim 3, characterized in that: The system also includes a second lifting cabinet having the same structure as the first lifting cabinet; The second lifting cabinet and the first lifting cabinet are redundant devices. When one of them fails, the second lifting cabinet and the first lifting cabinet are switched through a contactor.

5. The control drive system according to claim 3, characterized in that: The first lifting cabinet adopts a time-division multiplexing method to provide timing current for the lifting coils of all driving mechanisms.

6. The control drive system according to claim 3, characterized in that: The first lifting cabinet is provided with an out-of-step correction single-select module, and the out-of-step correction single-select module includes four single-select power switches; Four single-select power switches are used to connect or disconnect the corresponding lifting coils respectively, provide timing current for the specified single or multiple lifting coils, and realize the operation of locking a single or multiple control rod bundles in the out-of-step correction mode.

7. The control drive system according to claim 3, characterized in that: The first lifting cabinet comprises a first sub-group unit and a first second sub-group unit of the same structure; each transmission-preserving cabinet comprises a second sub-group unit and a second sub-group unit of the same structure; The first subgroup unit is connected to the second subgroup unit, and provides sequential current to the corresponding coils of the one-belt four-drive mechanism through a three-phase half-wave controllable rectifier module and a selection switch module; The first two subgroup units are connected to the second two subgroup units, and provide timing currents for corresponding coils of the one-belt four-drive mechanism through a three-phase half-wave controllable rectifier module and a selection switch module.

8. The control drive system according to claim 7, characterized in that: The second sub-group unit and the second sub-group unit of the transmission cabinet are both provided with a fuse bus in the main circuit, and the fuse bus is connected; the phase lines A, B, and C of each sub-group unit are connected to the fuse bus, the fuse bus is connected to four holding coils, and the holding coils are connected to the neutral line N; The fuse bus is used to monitor the current of the holding coil. When the current value of the holding coil drops beyond a set threshold, the fuse bus power switch is closed, and the current is provided by the holding coil main circuit of another sub-group unit of the protection cabinet.

9. The control drive system according to claim 8, characterized in that: For a rod group with eight control rods, the second subgroup unit and the second subgroup unit of the control cabinet are interconnected by a safety bus to form a redundant safety bus; The rod group with four bundles of control rods and the rod group with only one bundle of control rods are interconnected by insurance busbars to form a redundant insurance busbar form.

10. The control drive system according to claim 7, characterized in that: The first sub-group unit and the first second sub-group unit in the first lifting cabinet are powered by independent power supplies; The second first subgroup unit and the second second subgroup unit in the transmission protection cabinet are powered by independent power supplies.

11. The control drive system according to claim 3, characterized in that: The control driving main circuit power supply of the transmission coil and the holding coil in the transmission cabinet adopts a cross power supply mode.

12. The control drive system according to claim 3, characterized in that: The first lifting cabinet and the transmission protection cabinet directly perform three-phase half-wave controlled rectification through the three-phase half-wave controlled rectification module when the upstream power supply input is AC; When the upstream power supply input is DC, the DC-AC conversion is performed through the interface conversion module, and the transformer is used for isolation and voltage boosting, and then the three-phase half-wave controlled rectification is performed through the three-phase half-wave controlled rectifier module.

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