A comprehensive test device for control rod drive system with multi-stress coupling

Abstract

The invention discloses a comprehensive test device for a control rod drive system with multiple stress couplings, comprising a control rod drive mechanism, a test body, a high-temperature and high-pressure dynamic water test pipeline, a rod control rod position system test piece, an environmental chamber, a rod position detector, a control rod drive mechanism stator, a rod control rod position control host and a control room; the control rod drive mechanism is located in the test body, and the test body is connected to the high-temperature and high-pressure dynamic water test pipeline through a pipeline; the rod control rod position system test piece is located in the environmental chamber; the rod position detector and the control rod drive mechanism stator are arranged on the test body; the rod control rod position control host is located in the control room; the test body, the control room and the environmental chamber are connected by electrical connectors. The device can carry out environmental tests on the rod control rod position system while carrying out hot life tests on the drive line, and can obtain comprehensive reliability evaluation of the control rod drive system in a relatively short time by means of accelerated stress.

Description

Technical Field

[0001] The present invention relates to the field of nuclear reactor control technology, in particular to a comprehensive test device for a multi-stress coupled control rod drive system. Background Art

[0002] The reactor control rod drive system mainly includes control rod drive wires and rod control rod position system equipment. The control rod drive wires are used to realize the lifting, lowering and dropping of control rods through the drive mechanism; the rod control rod position system equipment is used to send a driving current of a certain frequency, phase sequence and current to the stator of the control rod drive mechanism according to external control instructions, so that the control rod drive mechanism can operate as required, and at the same time measure the operating position of the control rod to ensure the normal operation of the control rod drive system.

[0003] The reactor control rod drive system is a key system related to the safety of the nuclear reactor core. The long-term stable and reliable operation of the system is an important basis for the safe operation of the nuclear reactor. Through the reliability design of key components and systems, the optimization of structure and control from a theoretical perspective, and the verification, improvement and re-verification of the optimized design through experiments, it is an effective way to improve the reliability level of equipment and systems. In order to verify whether the system can operate stably for a long time in the reactor, whether the parameters such as stable operation time, stroke life, number of rod drops, and rod drop time can meet the requirements of engineering use, it is necessary to carry out system tests. In the past, life assessment tests for drive lines and drive mechanisms were carried out more frequently, usually simulating the operating environment of the drive line or drive mechanism in the reactor, and judging whether the life of the drive mechanism meets the stroke index requirements by carrying out continuous operation of a certain stroke, observing the operating waveform, and whether the specified action is completed smoothly; during the operation of the drive mechanism, the specified number of rod drops is completed and the rod drop time is obtained, and the stability of the rod drop time is used to judge whether the relevant structure affecting the rod drop time is reasonable and whether the function is reliable. For the rod control rod position system, simulated loads are often used to carry out relevant design function tests, and relevant verification tests are completed through drive mechanism or drive line tests. The simulated load is mainly based on the working parameters of the electromagnetic coils of the control rod drive mechanism of the actual nuclear power plant reactor, including the electromagnetic performance, inductance, impedance characteristics and current conduction capacity of the coil, so as to truly reflect and simulate the characteristics of the actual load. However, the simulated load does not take into account the high temperature and high pressure operating environment of the drive mechanism and the stress conditions in the medium, while the real reactor environment has a real impact on the stress state of the drive mechanism and the electrical performance of the rod control rod position system.

[0004] With the demand for improved reliability of nuclear power equipment, how to evaluate or verify the overall reliability and stability of the control rod drive system, a key system that affects core safety, has become a key focus of nuclear reactor design.

[0005] In view of this, this application is hereby filed. Summary of the invention

[0006] The technical problem to be solved by the present invention is that: at present, when the reliability and stability of the rod control rod position system are verified by simulating load, the high temperature and high pressure operating environment of the drive mechanism and the stress of the drive mechanism in the medium are not considered, which affects the verification result of the rod control rod position system. The purpose is to provide a comprehensive test device for the control rod drive system with multi-stress coupling, which can carry out environmental tests of the rod control rod position system while carrying out hot life tests of the drive line, and obtain the reliability verification results of the control rod drive system in a shorter time by accelerating stress method.

[0007] The present invention is achieved through the following technical solutions:

[0008] A comprehensive test device for a control rod drive system with multiple stress couplings comprises a control rod drive mechanism, a test body, a high-temperature and high-pressure dynamic water test pipeline, a rod control and rod position system test piece, an environmental chamber, a rod position detector, a control rod drive mechanism stator, a rod control and rod position control host and a control room; the control rod drive mechanism is located in the test body, and the test body is connected to the high-temperature and high-pressure dynamic water test pipeline through a pipeline; the rod control and rod position system test piece is located in the environmental chamber; the rod position detector and the control rod drive mechanism stator are arranged on the test body; the rod control and rod position control host is located in the control room; the test body, the control room and the environmental chamber are connected by electrical connectors.

[0009] Furthermore, when there is no need for dynamic water flushing, an electric heating element is also provided in the test body.

[0010] Furthermore, the high-temperature and high-pressure dynamic water test pipeline includes: a test branch and a main pump; one end of the test branch is connected to the inlet of the test body, and the other end of the test branch is connected to the outlet of the test body; the main pump is arranged on the test branch, and the main pump is located between the inlet and outlet of the test body.

[0011] Furthermore, the high-temperature and high-pressure dynamic water test pipeline also includes a bypass branch, one end of which is connected between the inlet of the test body and the main pump, and the other end of which is connected between the outlet of the test body and the main pump.

[0012] Furthermore, the high-temperature and high-pressure dynamic water test pipeline also includes an auxiliary system, and the auxiliary system is connected across both ends of the main pump.

[0013] Furthermore, the control rod drive mechanism is used for hot life test and provides real load for the rod control position system.

[0014] Furthermore, the environmental chamber is close to the test body.

[0015] Furthermore, the environmental box is used to provide a simulated environment for the rod-controlling rod position test piece, and the temperature and humidity in the environmental box are adjustable.

[0016] Furthermore, the environmental chamber is also used to provide accelerated stress for the rod-controlled rod position test piece, and the accelerated stress includes constant single stress, step single stress and temperature and humidity dual stress.

[0017] Furthermore, the environmental chamber includes a computing unit carrying an Arrhenius model, and the computing unit is used to convert the operating time of the rod control rod position system under the test conditions into an equivalent time under normal conditions.

[0018] Compared with the prior art, the present invention has the following advantages and beneficial effects: on the one hand, the control rod drive line / drive mechanism is placed in the test body, and the test body is connected to the high temperature and high pressure dynamic water test pipeline through a pipeline, so as to provide the drive line / drive mechanism with an environment simulating the reactor operation condition; on the other hand, the key components of the rod control rod position system are placed in an environmental box, and the environmental box can set different temperatures, humidity and their change curves, so as to provide an adjustable and controllable simulation environment for the environmental test of the key components of the rod control rod position; on the other hand, the rod position detector and the drive mechanism stator are installed on the test body, the key components of the rod control rod position are placed in the environmental box, and the rod control rod position control computer is placed in the test control, and the transmission of power supply control signals, rod position measurement and feedback signals is completed between the three through electrical connectors. Through the above three aspects of the setting, it is possible to complete the reliability related test of the rod control rod position while carrying out the hot life assessment test of the drive line / drive mechanism, and the environmental box can provide the required accelerated stress for the test piece of the rod control rod position system, so as to achieve the effect of completing the reliability test of the rod control rod position prototype in a relatively short time. In addition, in this device, the rod control and rod position control program is located outside the environmental chamber, and the drive mechanism and rod control and rod position signals can be controlled and monitored at any time. The drive line / drive mechanism and the rod control and rod position system can be jointly debugged and tested at the same time. During the test, the test can be suspended in time according to the fault situation, and the subsequent test can be continued after the test piece is optimized and improved. In addition, during the test, the performance of the drive mechanism can be checked and tested through the rod control and rod position test control cabinet. If the rod control and rod position test piece fails, the environmental chamber working conditions can be suspended in time to process the test piece. After the processing is completed, the test in the environmental chamber can be continued immediately, which is convenient to operate. Temperature measurement points can also be set for local areas of the rod control and rod position test piece, and they are led from the environmental chamber to the loop device measurement and control system, so as to facilitate timely monitoring and detection of abnormal phenomena of the test piece. The life test of the drive mechanism and the environmental test of the rod control and rod position test piece can be carried out at the same time, saving test costs and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A schematic diagram of a hot life test flow of a control rod drive line / drive mechanism provided in an embodiment of the present invention;

[0021] Figure 2 A schematic diagram of the connection relationship between the control rod drive system and the environmental chamber provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the experimental composition of a rod control rod position system provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0024] Example

[0025] With the demand for improved reliability of nuclear power equipment, how to evaluate or verify the overall reliability and stability of the control rod drive system, a key system that affects core safety, has become a focus of nuclear reactor design. However, at present, simulated loads are mostly used to carry out relevant design function tests for the rod control rod position system, and relevant verification tests are completed through drive mechanism or drive line tests. The simulated load is mainly based on the operating parameters of the electromagnetic coils of the control rod drive mechanism of the actual nuclear power plant reactor, including the electromagnetic properties, inductance, impedance characteristics and current conduction capacity of the coil, so as to truly reflect and simulate the characteristics of the actual load. However, the simulated load does not take into account the high temperature and high pressure operating environment of the drive mechanism and the stress conditions in the medium, and the actual reactor environment has a real impact on the stress state of the drive mechanism and the electrical performance of the rod control rod position system.

[0026] In view of the above technical problems, this embodiment provides a comprehensive test device for a control rod drive system with multiple stress couplings, which is used for comprehensive tests of a reactor control rod drive system. It can simultaneously carry out hot life tests of a drive mechanism / drive line and reliability growth tests of a rod control position, and can meet the high temperature, high pressure, and flow conditions of hot life tests of a drive mechanism / drive line, provide the rod control position system with actual operating electrical loads and temperature loads, and provide temperature and humidity stresses for the rod control position test piece through an environmental chamber, thus realizing a comprehensive test device with multiple stress couplings. By introducing a method of accelerated environmental stress, environmental tests are carried out on the rod control position system, and reliability evaluation of the rod control position system can be obtained in a relatively short time.

[0027] The device can inspect and test the performance of the drive mechanism in the life test on the rod control and rod position test control cabinet by arranging the measurement and control signals of the rod control and rod position system, and obtain characteristic parameters such as action current and operating waveform, so as to evaluate the performance of the drive mechanism. Temperature measurement points can be set for the areas of concern of the rod control and rod position test piece, and abnormal phenomena of the test piece can be monitored and discovered in time. The device can truly simulate the actual operating conditions of the reactor drive system, and the coupled accelerated stress method can detect defects in the rod control and rod position test piece in a relatively short time, which provides strong support for improving and evaluating the reliability of the equipment.

[0028] Specifically, a comprehensive test device for a control rod drive system with multiple stress coupling comprises a control rod drive mechanism, a test body, a high-temperature and high-pressure dynamic water test pipeline, a rod control and rod position system test piece, an environmental chamber, a rod position detector, a control rod drive mechanism stator, a rod control and rod position control host and a control room; the control rod drive mechanism is located in the test body, and the test body is connected to the high-temperature and high-pressure dynamic water test pipeline through a pipeline; the rod control and rod position system test piece is located in the environmental chamber; the rod position detector and the control rod drive mechanism stator are arranged on the test body; the rod control and rod position control host is located in the control room; the test body, the control room and the environmental chamber are connected by electrical connectors.

[0029] like Figure 1 As shown, a driving mechanism or driving line is installed in the test body. When there is no need for dynamic water flushing in the test, an electric heating element can be set in the test body to meet the requirements of hot working conditions. When there is a need for dynamic water flushing, the test body can be connected to the test branch through the inlet and outlet pipes, and the requirements of hot and flow conditions can be met through the main pump, auxiliary system, etc. Figure 1The high-temperature and high-pressure dynamic water test pipeline shown includes: a test branch and a main pump; one end of the test branch is connected to the inlet of the test body, and the other end of the test branch is connected to the outlet of the test body; the main pump is arranged on the test branch, and the main pump is located between the inlet and outlet of the test body. The high-temperature and high-pressure dynamic water test pipeline also includes a bypass branch and an auxiliary system, one end of the bypass branch is connected between the inlet of the test body and the main pump, and the other end of the bypass branch is connected between the outlet of the test body and the main pump. The auxiliary system is connected across the two ends of the main pump. It should be supplemented that the drive mechanism / drive line in the test body is a test piece for the hot life test, and also provides a real load for the rod control rod position system.

[0030] like Figure 2 As shown in the figure, during the test, the drive mechanism / drive line is installed in the hot test body, the rod control rod position test cabinet is placed in the control room, and the rod control rod position test piece is placed in the environmental chamber. The signal line between the rod control rod position test piece and the drive mechanism cannot be transmitted over long distances. Therefore, the environmental chamber where the rod control rod position test piece is placed should generally be as close to the drive mechanism of the test body as possible. The rod control rod position test cabinet has an operating system that can remotely control and display the rod position, so it can be placed in the control duty room in combination with the actual site. It should be noted that the environmental chamber can provide the required accelerated stress for the rod control rod position system test piece. The Arrhenius model can be used as the accelerated model for conversion, and the running time of the rod control rod position system under the test condition is converted to the equivalent time under normal conditions, so as to achieve the effect of completing the reliability test of the rod control rod position prototype in a shorter time. Regarding the selection of the accelerated stress of the rod control rod position system, the corresponding test plan can be formulated according to the running time of the drive line / drive mechanism, such as constant single stress, step single stress, temperature and humidity dual stress, etc., and finally the time required for the two tests is matched as much as possible.

[0031] like Figure 3 As shown, the signal connection relationship of the rod control and rod position system enables the rod control and rod position system as the measurement and control system of the driving mechanism to normally output control signals and receive sensing signals, while also enabling key components to be used as test pieces to carry out environmental tests in the environmental chamber.

[0032] In summary, the comprehensive test device for the control rod drive system with multi-stress coupling provided in this embodiment can carry out environmental tests of the rod control rod position system while carrying out the hot life test of the drive line, and can obtain comprehensive reliability evaluation of the control rod drive system in a relatively short time through the accelerated stress method. First, the control rod drive line / drive mechanism is placed in the test body, and the test body can be connected to the high-temperature and high-pressure dynamic water test pipeline through a pipeline to provide the drive line / drive mechanism with an environment simulating the operating conditions of the reactor, such as temperature, pressure, flow, etc. Second, the key components of the rod control rod position system are placed in an environmental box, and the environmental box can be set with different temperatures, humidity and their change curves to provide an adjustable and controllable simulation environment for the environmental test of the key components of the rod control rod position. Third, the rod position detector and the drive mechanism stator are installed on the test body, the key components of the rod control rod position are placed in the environmental box, and the rod control rod position control computer is placed in the test control, and the transmission of power control signals, rod position measurement and feedback signals is completed between the three through electrical connectors.

[0033] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A comprehensive test device for a control rod drive system with multiple stress couplings, characterized in that: It comprises a control rod drive mechanism, a test body, a high-temperature and high-pressure dynamic water test pipeline, a rod control and rod position system test piece, an environmental chamber, a rod position detector, a control rod drive mechanism stator, a rod control and rod position control host and a control room; the control rod drive mechanism is located in the test body, the test body is connected to the high-temperature and high-pressure dynamic water test pipeline through a pipeline; the rod control and rod position system test piece is located in the environmental chamber; the rod position detector and the control rod drive mechanism stator are arranged on the test body; the rod control and rod position control host is located in the control room; the test body, the control room and the environmental chamber are connected by electrical connectors; The environmental chamber is close to the test body and is used to provide a simulated environment for the rod-control-rod position test piece, and the temperature and humidity in the environmental chamber are adjustable; the environmental chamber is also used to provide accelerated stress for the rod-control-rod position test piece, and the accelerated stress includes constant single stress, step single stress and temperature and humidity double stress; the environmental chamber includes a calculation unit carrying the Arrhenius model, and the calculation unit is used to convert the operating time of the rod-control-rod position system under the test conditions into the equivalent time under normal conditions.

2. A comprehensive test device for a control rod drive system with multiple stress couplings according to claim 1, characterized in that: When there is no need for dynamic water flushing, an electric heating element is also provided in the test body.

3. The multi-stress coupling control rod drive system comprehensive test device according to claim 1, characterized in that: The high-temperature and high-pressure dynamic water test pipeline includes: a test branch and a main pump; one end of the test branch is connected to the inlet of the test body, and the other end of the test branch is connected to the outlet of the test body; the main pump is arranged on the test branch, and the main pump is located between the inlet and outlet of the test body.

4. The multi-stress coupling control rod drive system comprehensive test device according to claim 3, characterized in that: The high-temperature and high-pressure dynamic water test pipeline also includes a bypass branch, one end of which is connected between the inlet of the test body and the main pump, and the other end of which is connected between the outlet of the test body and the main pump.

5. A comprehensive test device for a control rod drive system with multiple stress couplings according to claim 3 or 4, characterized in that: The high-temperature and high-pressure dynamic water test pipeline also includes an auxiliary system, which is connected across both ends of the main pump.

6. The multi-stress coupling control rod drive system comprehensive test device according to claim 1, characterized in that: The control rod drive mechanism is used for hot life test and provides real load for the rod control position system.

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