A redundant architecture for a nuclear power plant rod control system and a rod control system comprising the same.

Abstract

This invention discloses a redundant architecture for a nuclear power plant rod control system and a rod control system including the same, comprising: a power supply, a control power supply, a first rectifier module, a second rectifier module, a main control module, and a control drive module. The first rectifier module includes rectifier module A1 and rectifier module A2; the second rectifier module includes rectifier module B1 and rectifier module B2; and the main control module includes main control module 1 and main control module 2. This invention separates the power supply function from the control function by setting up a power supply and a control power supply, and reduces the probability of power supply failure affecting the entire device by setting up redundant power supplies and control power supplies. Furthermore, by setting up a first rectifier module, a second rectifier module, and a main control module with a redundant architecture, this invention achieves redundancy in the power supply and control functions of the control drive module, improving the reliability and safety of the drive mechanism operation.

Description

Technical Field

[0001] This invention relates to the field of nuclear power control technology, specifically to a redundant architecture for a nuclear power plant rod control system and a rod control system including the same. Background Technology

[0002] The control rod drive mechanism (CRDM) in a reactor is the mechanism that moves the control rods up and down or holds them at a certain height. The rod control system provides sequential current to the lift coil (LC), move coil (MC), and hold coil (SC) of the drive mechanism, enabling the control rod drive mechanism to lift, hold, or insert the reactor control rods, thereby achieving reactor start-up, load operation, and shutdown functions. The main function of the rod control system is to control the output current magnitude and timing of the drive module by controlling the LC, MC, and SC, thus receiving lift, hold, or insert commands from the host computer to the drive mechanism.

[0003] The reliability of the rod control system directly affects the operational reliability of the control rods within the reactor, playing a crucial role in the safety of nuclear power plants. The commonly used single-circuit power supply and single-circuit control designs in system design have certain safety hazards and are difficult to meet the safety and reliability requirements of nuclear power plants. Summary of the Invention

[0004] The technical problem to be solved by this invention is the insufficient reliability of the current rod control system. The purpose is to provide a redundant architecture for the rod control system of a nuclear power plant and a rod control system including the architecture. The redundant architecture design of the rod control system from both the power supply and control functions is beneficial to improving the operational safety and reliability of the control rod drive mechanism.

[0005] This invention is achieved through the following technical solution:

[0006] A redundant architecture for a nuclear power plant rod control system includes: a power supply, a control power supply, a first rectifier module, a second rectifier module, a main control module, and a control drive module. The power supply is electrically connected to the control drive module through the first rectifier module, and the control power supply is electrically connected to the control drive module through the second rectifier module and the main control module.

[0007] Specifically, the control power supply includes an uninterruptible power supply and a normal power supply, and the power supply includes a rod power supply, which is itself designed with redundancy.

[0008] Optionally, the power supply for the rod is a three-phase 260VAC or 220VDC power supply, and both the uninterruptible power supply and the normal power supply are powered by 220VAC.

[0009] Specifically, the first rectifier module includes rectifier module A1 and rectifier module A2; the second rectifier module includes rectifier module B1 and rectifier module B2; the main control module includes main control module 1 and main control module 2; and the control drive module includes LC control drive module, MC control drive module and SC control drive module.

[0010] Optionally, the rectifier module A1 has an output voltage of 140VDC-220VDC and an output current of 0A-42A;

[0011] The rectifier module A2 has an output voltage of 140VDC-220VDC and an output current of 0A-9A.

[0012] The output voltages of rectifier module B1 and rectifier module B2 are 15VDC and 24VDC, respectively.

[0013] Specifically, the input terminals of both rectifier module A1 and rectifier module A2 are electrically connected to the output terminal of the rod power supply; the output terminal of rectifier module A1 is electrically connected to the LC control drive module and the MC control drive module, and the output terminal of rectifier module A2 is electrically connected to the SC control drive module.

[0014] The input terminal of the rectifier module B1 is electrically connected to the output terminal of the uninterruptible power supply and the output terminal of the normal power supply, and the input terminal of the rectifier module B2 is electrically connected to the output terminal of the uninterruptible power supply and the output terminal of the normal power supply.

[0015] The output terminal of the rectifier module B1 is electrically connected to the input terminal of the main control module 1, the input terminal of the main control module 2, the LC control drive module, the MC control drive module, and the SC control drive module;

[0016] The output terminal of the rectifier module B2 is electrically connected to the input terminal of the main control module 1, the input terminal of the main control module 2, the LC control drive module, the MC control drive module, and the SC control drive module;

[0017] The output terminals of both the main control module 1 and the main control module 2 are electrically connected to the LC control drive module, the MC control drive module, and the SC control drive module.

[0018] Furthermore, a first independent switch is provided between the rectifier module A1 and the rod power supply, and a second independent switch is provided between the rectifier module A2 and the rod power supply.

[0019] A first non-independent switch is provided between the uninterruptible power supply and the rectifier module B1 and the rectifier module B2;

[0020] A second non-independent switch is provided between the normal power supply and the rectifier module B1 and the rectifier module B2;

[0021] The first non-independent switch simultaneously controls the connection and disconnection between the uninterruptible power supply and the rectifier module B1 and the rectifier module B2;

[0022] The second non-independent switch simultaneously controls the connection and disconnection between the uninterruptible power supply and the rectifier module B1 and the rectifier module B2.

[0023] A nuclear power plant rod control system includes a redundant architecture as described above.

[0024] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0025] This invention separates the power supply function from the control function by setting up a power supply and a control power supply, and reduces the probability of power supply failure affecting the entire device by setting up a power supply and control power supply with redundancy.

[0026] This invention also achieves redundancy in the power supply and control functions of the control and drive module by setting up a first rectifier module, a second rectifier module, and a main control module with a redundant architecture, thereby improving the reliability and safety of the drive mechanism. Furthermore, it saves production costs while fully meeting the power supply and control functions of the control and drive module. Attached Figure Description

[0027] The accompanying drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the principles of the invention. These drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, but do not constitute a limitation on the embodiments of the present invention.

[0028] Figure 1 This is a schematic diagram of the redundant architecture of a nuclear power plant rod control system according to the present invention. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention.

[0030] It should also be noted that, for ease of description, only the parts relevant to the present invention are shown in the accompanying drawings.

[0031] Where there is no conflict, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0032] Example 1

[0033] Based on the fundamental design principle of "defense in depth" for nuclear power plants, in order to prevent accidents as much as possible, the rod control system is designed with a redundant architecture in terms of both power supply and control functions, which is conducive to improving the operational safety and reliability of the control rod drive mechanism.

[0034] like Figure 1 As shown, a redundant architecture for a nuclear power plant rod control system is provided, including: a power supply, a control power supply, a first rectifier module, a second rectifier module, a main control module, and a control drive module. The power supply is electrically connected to the control drive module through the first rectifier module, and the control power supply is electrically connected to the control drive module through the second rectifier module and the main control module. By implementing a redundant architecture design using the power supply, control power supply, first rectifier module, second rectifier module, and main control module, and controlling the output current and current timing of the control drive module, dual redundancy functions for power supply and timing control of the drive mechanism are achieved.

[0035] The power supply includes a redundant power supply unit, which is powered by three-phase 260VAC or 220VDC. The control power supply includes an uninterruptible power supply (UPS) and a normal operating power supply, both of which are powered by 220VAC.

[0036] In this embodiment, as Figure 1 As shown, the first rectifier module includes rectifier module A1 and rectifier module A2; the second rectifier module includes rectifier module B1 and rectifier module B2; the main control module includes main control module 1 and main control module 2; and the control drive module includes LC control drive module, MC control drive module and SC control drive module.

[0037] The specific connection structure is as follows: the input terminals of rectifier module A1 and rectifier module A2 are both electrically connected to the output terminal of the rod power supply; the output terminal of rectifier module A1 is electrically connected to the LC control drive module and the MC control drive module, and the output terminal of rectifier module A2 is electrically connected to the SC control drive module.

[0038] The input terminal of rectifier module B1 is electrically connected to the output terminal of the uninterruptible power supply and the output terminal of the normal power supply, and the input terminal of rectifier module B2 is electrically connected to the output terminal of the uninterruptible power supply and the output terminal of the normal power supply.

[0039] The output terminal of rectifier module B1 is electrically connected to the input terminal of main control module 1, the input terminal of main control module 2, the LC control drive module, the MC control drive module, and the SC control drive module; the output terminal of rectifier module B2 is electrically connected to the input terminal of main control module 1, the input terminal of main control module 2, the LC control drive module, the MC control drive module, and the SC control drive module.

[0040] The output terminals of both main control module 1 and main control module 2 are electrically connected to the LC control drive module, MC control drive module and SC control drive module.

[0041] The drive control module is equipped with redundant power supply. The power supply converts the three-phase 260VAC to 140VDC-220VDC through rectifier modules A1 and A2. Rectifier module A1 outputs a voltage of 140VDC-220VDC and an output current of 0A-42A; rectifier module A2 outputs a voltage of 140VDC-220VDC and an output current of 0A-9A. When the drive mechanism needs to operate, the LC control drive module, MC control drive module, and SC control drive module output current according to the instructions from the host computer.

[0042] The control power supply for the control drive module is redundantly supplied, consisting of two redundant 220VAC power supplies converted to 15VDC and 24VDC via rectifier modules B1 and B2. Rectifier modules B1 and B2 have identical functional designs and outputs, providing redundancy. Both rectifier modules B1 and B2 output voltages of 15VDC and 24VDC, respectively. The 15VDC output from rectifier modules B1 and B2 powers the IGBTs of the control drive module, while the 24VDC output powers other control circuits within the control drive module.

[0043] The logic control redundancy design of the control drive module is implemented by two identical and redundant main control modules 1 and 2, and both main control modules 1 and 2 are powered by 24VDC output from rectifier modules B1 and B2.

[0044] To address the redundant power supply for the control and drive module, on one hand, a redundantly designed rod power supply is used to improve the reliability of the power supply head. On the other hand, in the event of a power system failure, to prevent non-human-caused rod slippage or drop events, the rod control system triggers the MC and SC control drive modules to execute a dual-holding command. This means that both modules simultaneously output the current required to maintain the current rod position. In this embodiment, the redundant power supply design of the control and drive module, with the MC and SC control drive modules powered by rectifier modules A1 and A2 respectively, provides redundant power to maintain the current rod position in the dual-holding state, improving the reliability of the dual-holding action. Furthermore, the different current output designs of rectifier modules A1 and A2 can fully meet the different current requirements of the LC, MC, and SC control drive modules. Additionally, since the output current of rectifier module A2 is lower than that of rectifier module A1, smaller capacitor modules can be used in rectifier module A2 to meet the power supply requirements, thus saving production costs.

[0045] For the control drive module, redundant power supply is provided. On the one hand, two redundant 220VAC power supplies are used; on the other hand, redundant rectifier modules B1 and B2 are used to improve the reliability of the control power supply.

[0046] A redundant logic control design is implemented for the control drive module. Two identically configured, redundant main control modules, 1 and 2, are used, and both are redundantly powered by rectifier modules B1 and B2, improving the reliability of the system control function.

[0047] Example 2

[0048] In addition, switches are added to control each module. A first independent switch is set between rectifier module A1 and the rod power supply, and a second independent switch is set between rectifier module A2 and the rod power supply.

[0049] A first non-independent switch is provided between the uninterruptible power supply and rectifier modules B1 and B2; a second non-independent switch is provided between the normal power supply and rectifier modules B1 and B2.

[0050] The first non-independent switch simultaneously controls the connection and disconnection between the uninterruptible power supply and rectifier modules B1 and B2; the second non-independent switch simultaneously controls the connection and disconnection between the uninterruptible power supply and rectifier modules B1 and B2.

[0051] Example 3

[0052] A nuclear power plant rod control system is provided, including the redundant architecture of the nuclear power plant rod control system described above.

[0053] In the description of this specification, the references to terms such as "one embodiment and method," "some embodiments and methods," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment and method or example is included in at least one embodiment and method or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment and method or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments and methods or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments and methods or examples described in this specification, as well as the features of different embodiments and methods or examples.

[0054] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0055] Those skilled in the art should understand that the above embodiments are merely for illustrating the present invention and are not intended to limit the scope of the invention. Those skilled in the art can make other changes or modifications based on the above invention, and these changes or modifications still fall within the scope of the present invention.

Claims

1. A redundant architecture for a nuclear power plant rod control system, characterized in that, include: The system includes a power supply, a control power supply, a first rectifier module, a second rectifier module, a main control module, and a control drive module. The power supply is electrically connected to the control drive module through the first rectifier module, and the control power supply is electrically connected to the control drive module through the second rectifier module and the main control module. The control power supply includes an uninterruptible power supply and a normal power supply, and the power supply includes a rod power supply, which itself is redundantly designed. The first rectifier module includes rectifier module A1 and rectifier module A2; the second rectifier module includes rectifier module B1 and rectifier module B2; the main control module includes main control module 1 and main control module 2; the control drive module includes LC control drive module, MC control drive module and SC control drive module; The input terminal of the rectifier module B1 is electrically connected to the output terminal of the uninterruptible power supply and the output terminal of the normal power supply, and the input terminal of the rectifier module B2 is electrically connected to the output terminal of the uninterruptible power supply and the output terminal of the normal power supply. The output terminal of the rectifier module B1 is electrically connected to the input terminal of the main control module 1, the input terminal of the main control module 2, the LC control drive module, the MC control drive module, and the SC control drive module; The output terminal of the rectifier module B2 is electrically connected to the input terminal of the main control module 1, the input terminal of the main control module 2, the LC control drive module, the MC control drive module, and the SC control drive module; The output terminals of both the main control module 1 and the main control module 2 are electrically connected to the LC control drive module, the MC control drive module, and the SC control drive module.

2. The redundant architecture of a nuclear power plant rod control system according to claim 1, characterized in that, The power supply for the rod is a three-phase 260VAC or 220VDC power supply, and both the uninterruptible power supply and the normal power supply are powered by 220VAC.

3. The redundant architecture of a nuclear power plant rod control system according to claim 1, characterized in that, The rectifier module A1 has an output voltage of 140VDC-220VDC and an output current of 0A-42A. The rectifier module A2 has an output voltage of 140VDC-220VDC and an output current of 0A-9A. The output voltages of rectifier module B1 and rectifier module B2 are 15VDC and 24VDC, respectively.

4. The redundant architecture of a nuclear power plant rod control system according to claim 1, characterized in that, The input terminals of both rectifier module A1 and rectifier module A2 are electrically connected to the output terminal of the rod power supply; the output terminal of rectifier module A1 is electrically connected to the LC control drive module and the MC control drive module, and the output terminal of rectifier module A2 is electrically connected to the SC control drive module.

5. The redundant architecture of a nuclear power plant rod control system according to claim 1, characterized in that, A first independent switch is provided between the rectifier module A1 and the rod power supply, and a second independent switch is provided between the rectifier module A2 and the rod power supply.

6. The redundant architecture of a nuclear power plant rod control system according to claim 1, characterized in that, A first non-independent switch is provided between the uninterruptible power supply and the rectifier module B1 and the rectifier module B2; A second non-independent switch is provided between the normal power supply and the rectifier module B1 and the rectifier module B2; The first non-independent switch simultaneously controls the connection and disconnection between the uninterruptible power supply and the rectifier module B1 and the rectifier module B2; The second non-independent switch simultaneously controls the connection and disconnection between the uninterruptible power supply and the rectifier module B1 and the rectifier module B2.

7. A nuclear power plant rod control system, characterized in that, Includes a redundant architecture for a nuclear power plant rod control system as described in any one of claims 1-6.

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