Containment vessel integral seal test apparatus

Abstract

The utility model relates to a kind of containment integral sealing test equipment, including a collector and the external computer connected with collector;The collector includes a shielding shock attenuation cabinet, and the shielding shock attenuation cabinet includes a LXI machine case, pressure acquisition module, temperature and humidity acquisition module and power supply module;LXI machine case is also connected with LXI machine case controller;Wherein, LXI machine case one end connects temperature and humidity acquisition module, and the other end is connected to external computer by a ethernet switch;Pressure acquisition module is connected to external computer by a serial device networking server and ethernet switch in turn;The power supply module is connected with serial device networking server and pressure acquisition module respectively.The utility model when containment pressure test integral sealing evaluation, from acquisition temperature, humidity, pressure signal, to real-time data analysis, gives containment integral sealing test evaluation result, realizes complete automation throughout, need not manual intervention, guarantees the objectivity of evaluation result.

Description

Technical Field

[0001] This utility model relates to the overall sealing performance evaluation of the containment pressure test in nuclear power plants, specifically to a containment overall sealing test device. Background Technology

[0002] The containment vessel is a crucial component of the nuclear safety barrier, serving as the last line of defense between the nuclear power plant and the public. To ensure the integrity of the containment vessel and public safety, regulations stipulate that nuclear power units must undergo periodic containment vessel tightness tests after construction.

[0003] The containment overall sealing test acquisition system and related products and equipment currently used in nuclear power plants have been in use for more than ten years, and the equipment is showing significant signs of aging. The system architecture and functions are relatively simple, especially the insulation test, which still requires on-site test personnel to manually test with handheld insulation meters.

[0004] With the continuous commissioning of nuclear power units in China, in order to adapt to various reactor types and application scenarios, and to further improve the reliability, stability and localization rate of test equipment, the containment pressure test related equipment urgently needs to be upgraded. Summary of the Invention

[0005] To address the limitations of existing data acquisition systems and equipment that are limited in functionality and unable to adapt to the needs of various reactor types and application scenarios, this invention provides a new testing device that not only meets the basic requirements for multi-channel temperature, humidity, and pressure measurement, but also adds automatic insulation and continuity checks, audible and visual alarm functions, and improves the automation capability of the overall sealing performance evaluation of containment pressure tests.

[0006] The technical solution of this utility model is as follows: An integral containment sealing test device includes a data acquisition unit and an external computer connected to the data acquisition unit. The data acquisition unit includes a shielded and vibration-damped cabinet, which includes an LXI chassis, a pressure acquisition module, a temperature and humidity acquisition module, and a power supply module. The LXI chassis is also connected to an LXI chassis controller. One end of the LXI chassis is connected to the temperature and humidity acquisition module, and the other end is connected to the external computer via an Ethernet switch. The pressure acquisition module is connected to the external computer via a serial port device networking server and an Ethernet switch. The power supply module is connected to both the serial port device networking server and the pressure acquisition module.

[0007] The LXI chassis includes several multiplexer modules and a matrix switch module; the multiplexer modules are arranged in parallel, and their input terminals are connected to the temperature and humidity acquisition module; one end of the matrix switch module is connected to the output terminal of the multiplexer module, and the other end is connected to an external computer through a digital multimeter; the matrix switch module is also connected to the external computer in sequence through the LXI chassis controller and an Ethernet switch.

[0008] It also includes an insulation resistance tester, one end of which is connected to the matrix switch module, and the other end is connected to an external computer via a serial port device network server and an Ethernet switch.

[0009] The temperature and humidity acquisition module includes a temperature and humidity signal adapter board located inside the shielded and vibration-damped cabinet, and a temperature probe and a humidity probe located outside the shielded and vibration-damped cabinet; both the temperature probe and the humidity probe are connected to the multiplexer module through the temperature and humidity signal adapter board.

[0010] The pressure acquisition module includes a pressure signal adapter board located inside the shielded and vibration-damping cabinet and a digital pressure transmitter located outside the shielded and vibration-damping cabinet; one end of the pressure signal adapter board is connected to the digital pressure transmitter, and the other end is connected to an external computer via a serial port device network server and an Ethernet switch.

[0011] The power supply module is a power distributor, which is connected to a serial port device network server and a pressure signal adapter board. The power distributor is also connected to a flashing buzzer.

[0012] The digital multimeter is connected to an external computer via a USB interface. The LXI chassis controller is connected to the Ethernet switch via LAN1, and the serial port device network server is connected to the Ethernet switch via LAN2. The Ethernet switch is connected to the external computer via LAN3.

[0013] The insulation resistance tester is connected to the serial device network server via RS232, the power distributor is connected to the serial device network server via RS485, and the pressure signal adapter board is connected to the serial device network server via 6 RS422 channels.

[0014] The external computer includes a data acquisition computer and an analysis computer; the digital multimeter, LXI chassis controller, and Ethernet switch are all connected to the data acquisition computer; the analysis computer is connected to the data acquisition computer in sequence via LAN4, Ethernet switch, and LAN3.

[0015] The temperature probe is a PT100 resistance temperature detector, the humidity probe is a 4~20mA current output humidity probe, and the digital pressure transmitter is a digital pressure transmitter that communicates via RS422 serial port.

[0016] The technical advantages of this utility model are as follows: This invention achieves full automation in the overall sealing performance evaluation of the containment pressure test, from collecting temperature, humidity, and pressure signals to real-time data analysis and finally providing the overall sealing performance evaluation results. No manual intervention is required, and the objectivity of the evaluation results is also guaranteed. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the system composition of a containment overall sealing performance testing device according to this utility model.

[0018] Figure 2 This is a schematic diagram of the system structure of a containment integral sealing performance testing device according to the present invention; Where a represents the front of the cabinet; b represents the back of the cabinet.

[0019] Figure 3 This utility model presents a schematic diagram of the temperature and humidity signal acquisition and continuity check principle of an integral sealing test device for containment.

[0020] Figure 4 This is a schematic diagram of the pressure signal acquisition principle of a containment integral sealing performance testing device according to this utility model.

[0021] Figure 5 This is a schematic diagram of the insulation inspection principle of a containment overall sealing test device according to this utility model.

[0022] Figure 6 This is a schematic diagram of the audible and visual alarm principle of a containment overall sealing performance testing device according to this utility model. Detailed Implementation

[0023] Example 1 An integral containment sealing test device includes a data acquisition unit and an external computer connected to the data acquisition unit. The data acquisition unit includes a shielded and vibration-damped cabinet, which includes an LXI chassis, a pressure acquisition module, a temperature and humidity acquisition module, and a power supply module. The LXI chassis is also connected to an LXI chassis controller. One end of the LXI chassis is connected to the temperature and humidity acquisition module, and the other end is connected to the external computer via an Ethernet switch. The pressure acquisition module is connected to the external computer via a serial port device networking server and an Ethernet switch. The power supply module is connected to both the serial port device networking server and the pressure acquisition module.

[0024] The specific implementation process of this embodiment is as follows: the temperature and humidity acquisition module and the pressure acquisition module acquire information. The information acquired by the temperature and humidity acquisition module is transmitted sequentially to an external computer via the LXI chassis and an Ethernet switch. The information acquired by the pressure acquisition module is transmitted sequentially to an external computer via a serial port device network server and an Ethernet switch. The external computer processes the information. The LXI chassis controller is used to switch between the temperature and humidity signals in the temperature and humidity acquisition module.

[0025] Example 2 Based on Example 1, it also includes: The LXI chassis includes several multiplexer modules and a matrix switch module; the multiplexer modules are connected in parallel, and their input terminals are connected to the temperature and humidity acquisition module; one end of the matrix switch module is connected to the output terminal of the multiplexer modules, and the other end is connected to an external computer through a digital multimeter; the matrix switch module is also connected to the external computer in sequence through the LXI chassis controller and an Ethernet switch; the LXI chassis controller controls the matrix switch module to switch the temperature signal and humidity signal in the temperature and humidity acquisition module.

[0026] It also includes an insulation resistance tester, one end of which is connected to the matrix switch module, and the other end is connected to an external computer via a serial port network server and an Ethernet switch. The insulation resistance tester is used for automatic insulation checks of the channel; by measuring the insulation resistance value between two sets of insulated wires, it determines whether there is a fault of low insulation resistance or short circuit between the insulated wires.

[0027] Example 3 Based on Example 2, it also includes: The temperature and humidity acquisition module includes a temperature and humidity signal adapter board located inside the shielded and vibration-damped cabinet, and a temperature probe and a humidity probe located outside the shielded and vibration-damped cabinet; both the temperature probe and the humidity probe are connected to the multiplexer module through the temperature and humidity signal adapter board.

[0028] The pressure acquisition module includes a pressure signal adapter board located inside the shielded and vibration-damping cabinet and a digital pressure transmitter located outside the shielded and vibration-damping cabinet; one end of the pressure signal adapter board is connected to the digital pressure transmitter, and the other end is connected to an external computer via a serial port device network server and an Ethernet switch.

[0029] The power supply module is a power distributor, which is connected to a serial port device network server and a pressure signal adapter board. The power distributor is also connected to a flashing buzzer.

[0030] Example 4 Based on Example 3, it also includes: The digital multimeter is connected to an external computer via a USB interface; the LXI chassis controller is connected to the Ethernet switch via LAN1; the serial port device networking server is connected to the Ethernet switch via LAN2; and the Ethernet switch is connected to the external computer via LAN3. The insulation resistance tester is connected to the serial device network server via RS232, the power distributor is connected to the serial device network server via RS485, and the pressure signal adapter board is connected to the serial device network server via 6 RS422 channels. The external computer includes a data acquisition computer and an analysis computer; the digital multimeter, LXI chassis controller, and Ethernet switch are all connected to the data acquisition computer; the analysis computer is connected to the data acquisition computer via LAN4, the Ethernet switch, and LAN3 in sequence. The temperature probe is a PT100 resistance temperature detector, the humidity probe is a 4~20mA current output humidity probe, and the digital pressure transmitter is a digital pressure transmitter that communicates via RS422 serial port.

[0031] The main performance indicators of this utility model are as follows: a) Interface: 1) Temperature and humidity probes use 7-pin aviation connectors, while digital pressure transmitters use 9-pin D-SUB connectors; 2) The communication interface between the data acquisition unit and the external computer is USB and LAN, and the communication interface with the digital pressure transmitter is DB9; 3) Each DB9 provides 12VDC power and RS422 communication for the digital pressure transmitter; b) Number of channels: 112 for temperature and humidity acquisition modules and 6 for pressure acquisition modules; c) Acquisition period: The acquisition period of the temperature and humidity acquisition module is 1 min to 5 min, and the acquisition period of the pressure acquisition module is 1 s to 5 min. The specific acquisition period is adjusted according to the actual working conditions. d) Accuracy: The error of the temperature channel in the range of 0 to 100℃ shall not exceed 0.1%, the error of the humidity channel in the range of -20℃ to +100℃ (relative humidity expressed in dew point temperature) shall not exceed 0.1%, and the error of the pressure channel in the range of 0 to 7000mbar shall not exceed 0.01%FS; e) Repeatability: Using a four-wire standard resistor (100Ω, accuracy 0.02%) to simulate a sensor, the maximum deviation (difference between the average value and the maximum or minimum value) of 50 sets of data is less than 0.01Ω, and the standard deviation is less than 0.005Ω; f) Stability: It has the ability to operate stably for more than two weeks, and the system works normally for 24 × 14 = 336 hours; g) It has comprehensive system self-testing, calibration, testing, analysis, and channel management functions; h) It has automatic insulation and continuity checks for each channel from the data acquisition unit to the sensor network, with a measured voltage of 50V, a resistance value greater than 1GΩ between contacts, and a resistance value greater than 1MΩ between the shield and the contact.

[0032] The system provides 112 channels for four-wire PT100 resistance temperature measurement, 4-20mA humidity measurement, and 6 channels for RS422 pressure measurement. Among them, the resistance and current measurement channels reserve 6 switch resources to facilitate future system upgrades, maintenance, and expansion.

[0033] All signal ports of the data acquisition unit use high-reliability connectors to ensure secure installation, stable signal transmission, and smooth assembly and disassembly. The temperature and humidity measurement channels use 7-pin aviation connectors, which are matched with the 7-pin Jarger / AVIC Optoelectronics interface of the EPP cabinet via the data acquisition unit connection cable. The pressure acquisition module uses a 9-pin D-SUB interface. For different models of digital pressure transmitters, the 9-pin D-SUB interface can be directly connected to the data acquisition unit, and the 6-pin M8 interface can be converted to a 9-pin D-SUB via a cable to adapt to the data acquisition unit interface.

[0034] The data acquisition unit's communication interface adopts a standardized design, supporting standard LAN, USB, RS232 / 422 / 485 and other communication methods. Communication modules using different communication methods are interchangeable, allowing users to switch between them at will.

[0035] All major equipment in the system uses mature and stable shelving products, capable of continuous trouble-free operation for more than two weeks, and can work normally for 24 x 14 = 336 hours. The functions of each module are as follows: a) External computer: As the management center of the system, the data acquisition and analysis software of the containment overall sealing assessment system runs on an external computer, which controls all instruments and equipment in the data acquisition unit (equipped with a USB to LAN expansion dock). b) LXI chassis: Provides a high-speed Ethernet data transmission channel between external computers and multiplexer modules and matrix switch modules, with 3 reserved slots; c) Multiplexing switch module: Provides a 49-to-1 four-pole switch, which is used for channel switching of the four-wire resistance signal of the PT100 temperature probe and the 4-20mA current signal of the humidity probe respectively; d) Matrix switch module: Provides a 24×8 matrix switch for channel switching of resistance and current measurement and automatic insulation and continuity checks; e) Ethernet switch: Provides high-speed data transmission between external computers and LAN devices, with 4 reserved interfaces; f) Serial port device networking server: provides 8 RS232 / 422 / 485 serial communication ports to integrate insulation resistance testers and digital pressure transmitters into the LXI bus system; g) Digital multimeter: accuracy 8½, main measurement functions are four-wire resistance, DC current, etc., used for data acquisition of temperature probe and humidity probe; h) Insulation resistance tester: used for automatic insulation checks of the measuring channel; i) Flashing buzzer: an audible and visual alarm device used to warn users when data collection is abnormal; j) Power distributor: The system power distribution unit provides 220VAC / 50Hz power to AC electrical equipment, 24VDC power to the flashing buzzer, and 12VDC power to the digital pressure transmitter; k) Temperature and humidity signal adapter board / pressure signal adapter board: The temperature and humidity signal adapter board provides 112 7-pin aviation connectors to the outside and connects to multiplexer modules internally; the pressure signal adapter board provides 6 9-pin D-SUB interfaces to the outside and connects to serial port devices, network servers and power distributors internally for signal conversion between the inside and outside of the data acquisition unit. l) Shielded and vibration-damping cabinet: A movable cabinet that provides installation space for the data acquisition equipment.

[0036] like Figure 2 As shown, all the equipment of this utility model is arranged in one 14U cabinet.

[0037] The front of the cabinet, from top to bottom, consists of: a fan plate (2U), an expansion board (4U, which houses an LXI chassis), a glass panel (6U, which houses a digital multimeter and an insulation resistance tester), and a power distributor (2U); the back of the cabinet, from top to bottom, consists of: signal adapter board I (5.5U), signal adapter board II (5.5U), and signal adapter board III (3U).

[0038] (1) Temperature and humidity signal acquisition like Figure 3 As shown, the digital multimeter is an 8½ high-precision digital multimeter used to acquire data from the sensor terminals (temperature probe and humidity probe). At the same time, a matrix switch module and a multiplexer switch module are used to switch the sensor signal channels of the temperature probe and humidity probe, ensuring that only one sensor signal channel is connected to the digital multimeter at any given time, while the other sensor channels are disconnected.

[0039] The temperature probe has a measurement range of 0–100℃ and a signal range of 100–138.5Ω. It uses a four-wire resistance measurement method for data acquisition, which requires switching four signal lines simultaneously. Its advantage is that it can eliminate the test error caused by the resistance of the test leads, thereby improving the accuracy of resistance measurement.

[0040] The humidity probe has a range of -20℃ to +100℃ (relative humidity is expressed as dew point temperature), a signal range of 4 to 20mA, and uses DC current measurement method for data acquisition. It requires switching two signal lines simultaneously.

[0041] All signal lines are switched between multiplexed channels via three multiplexer modules and one matrix switch module, providing up to 147 switching resources. Of these, 112 channels are used for temperature and humidity signal acquisition, 29 for insulation checks, and 6 are reserved. The system is designed so that the multiplexer modules switch two channels per second, allowing for the sequential acquisition of 112 channels per minute. Depending on the number of channels acquired, the acquisition cycle can be adjusted from 1 minute to 5 minutes.

[0042] In the topology of the multiplexer module, each multiplexer module CH1 to CH38 serves as a signal contact switching channel. For four-wire resistance measurement, COM1 and COM3 of the first module are connected as one end of the resistance signal to the LO and LO-SENSE terminals of the digital multimeter, while COM2 and COM4 of the second module are connected as the other end of the resistance signal to the HI and HI-SENSE terminals of the digital multimeter. Both switches must be closed simultaneously during measurement. For two-wire current measurement, COM1 and COM3 are connected as current signal acquisition terminals to the LO and mA terminals of the digital multimeter. Only one switch needs to be closed during measurement.

[0043] (2) Pressure signal acquisition like Figure 4 As shown, this utility model completes the data acquisition of the digital pressure transmitter through a serial port device network server, uses the RS422 communication protocol for data transmission, and the acquisition cycle can be adjusted from 1 second to 5 minutes. At the same time, the digital pressure transmitter is powered by the 12VDC switching power supply built into the power distributor.

[0044] (3) Automatic insulation and continuity check The measurement channel, from the data acquisition unit to the sensor, requires automatic insulation and continuity checks. The signal transmission in the measurement channel uses a multi-core cable; the continuity resistance of each core and the insulation resistance between any two cores must be checked. A dedicated measurement device is connected to each core of the multi-core cable via a multiplexer module. By controlling the switching of each channel in the multiplexer module, the detection of different cable cores can be achieved.

[0045] Continuity testing employs a four-wire resistance measurement method, using a four-wire standard resistor (100Ω, accuracy 0.02%) to simulate a temperature probe. The measurement principle is the same as that for temperature and humidity signal acquisition. Figure 3 As shown.

[0046] Insulation inspection employs the insulation resistance measurement method. By measuring the insulation resistance between two or more insulated conductors, it determines whether there are faults such as low insulation resistance or short circuits. This system uses a programmable insulation resistance tester to measure insulation resistance. A 50V voltage is applied between the insulators under test, and the insulation resistance value between them is measured using specialized equipment. The working principle is as follows: Figure 5 As shown.

[0047] In the topology of the switching module, each multiplexed switching module CH1~CH38 is a signal contact switching channel, and CH40~CH49 is a shielded contact switching channel. The switching modules work together to complete the switching control of all 112 measurement channels.

[0048] Taking channel 1 as an example, when checking the insulation between contacts, 2-3, 2-4, 2-5, 3-4, 3-5, and 4-5 are connected in sequence, and the switching control is achieved through CH1.1 / CH1.3 of multiplexer module 1, CH1.2 / CH1.4 of multiplexer module 2, and X1, X3, X6, and X8 of matrix switch module. When checking the insulation between shielding and contacts, 1-2, 1-3, 1-4, and 1-5 are connected in sequence, where one core is the shielding contact, and the switching control is achieved through CH40.1 of multiplexer module 3 and X9 of matrix switch module.

[0049] (4) Audible and visual alarm like Figure 6 As shown, all acquisition channels in the system can have safety thresholds set via software. When the acquired value exceeds the set threshold, the control matrix switch module sequentially connects the flashing buzzer through the serial port device network server and power distributor to issue an audible and visual alarm to the on-site test personnel.

Claims

1. A containment integrity test apparatus, characterized by, The system includes a data acquisition unit and an external computer connected to the data acquisition unit. The data acquisition unit includes a shielded and vibration-damping cabinet, which includes an LXI chassis, a pressure acquisition module, a temperature and humidity acquisition module, and a power supply module. The LXI chassis is also connected to an LXI chassis controller. One end of the LXI chassis is connected to the temperature and humidity acquisition module, and the other end is connected to the external computer via an Ethernet switch. The pressure acquisition module is connected to the external computer via a serial port device networking server and an Ethernet switch. The power supply module is connected to both the serial port device networking server and the pressure acquisition module.

2. The containment overall sealing performance testing equipment according to claim 1, characterized in that, The LXI chassis includes several multiplexer modules and a matrix switch module; the multiplexer modules are arranged in parallel, and their input terminals are connected to the temperature and humidity acquisition module; one end of the matrix switch module is connected to the output terminal of the multiplexer module, and the other end is connected to an external computer through a digital multimeter; the matrix switch module is also connected to the external computer in sequence through the LXI chassis controller and an Ethernet switch.

3. The containment overall sealing performance testing equipment according to claim 2, characterized in that, It also includes an insulation resistance tester, one end of which is connected to the matrix switch module, and the other end is connected to an external computer via a serial port device network server and an Ethernet switch.

4. The containment overall sealing performance testing equipment according to claim 3, characterized in that, The temperature and humidity acquisition module includes a temperature and humidity signal adapter board located inside the shielded and vibration-damped cabinet, and a temperature probe and a humidity probe located outside the shielded and vibration-damped cabinet; the temperature probe and the humidity probe are both connected to the multiplexer module through the temperature and humidity signal adapter board.

5. The containment integrity test apparatus of claim 4, wherein The pressure acquisition module includes a pressure signal adapter board located inside the shielded and vibration-damping cabinet and a digital pressure transmitter located outside the shielded and vibration-damping cabinet; one end of the pressure signal adapter board is connected to the digital pressure transmitter, and the other end is connected to an external computer via a serial port device network server and an Ethernet switch.

6. The containment integrity test apparatus of claim 5, wherein, The power supply module is a power distributor, which is connected to a serial port device network server and a pressure signal adapter board. The power distributor is also connected to a flashing buzzer.

7. The containment overall sealing performance testing equipment according to claim 2, characterized in that, The digital multimeter is connected to an external computer via a USB interface. The LXI chassis controller is connected to the Ethernet switch via LAN1, and the serial port device network server is connected to the Ethernet switch via LAN2. The Ethernet switch is connected to the external computer via LAN3.

8. The containment integrity test apparatus of claim 6, wherein, The insulation resistance tester is connected to the serial device network server via RS232, the power distributor is connected to the serial device network server via RS485, and the pressure signal adapter board is connected to the serial device network server via 6 RS422 channels.

9. The containment integrity test apparatus of claim 1, wherein The external computer includes a data acquisition computer and an analysis computer; the digital multimeter, LXI chassis controller, and Ethernet switch are all connected to the data acquisition computer; the analysis computer is connected to the data acquisition computer in sequence via LAN4, Ethernet switch, and LAN3.

10. The containment integrity test apparatus of claim 4, wherein The temperature probe is a PT100 resistance temperature detector, the humidity probe is a 4~20mA current output humidity probe, and the digital pressure transmitter is a digital pressure transmitter that communicates via RS422 serial port.

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