Special Performance Testing Device and Testing Method for Thermocouples in Reactor Core Measurement System of Nuclear Power Plant

Abstract

The present invention relates to the technical field of overhaul of in-core thermocouples, and particularly to a special performance testing device and testing method for thermocouples in a nuclear power plant in-core measurement system. The testing device includes: a thermocouple testing terminal block connected to a testing thermocouple; a channel selection switch respectively connected to the thermocouple testing terminal block and a testing mode selection switch; the testing mode selection switch respectively connected to a connectivity measurement interface and an insulation resistance measurement interface; one end of the insulation resistance measurement interface is connected to a ground wire. The testing method is as follows: the testing device sequentially selects channels of the thermocouple through the measurement channel selection switch and records the measurement data of the continuity measuring instrument; the measurement mode selection switch is placed in the insulation resistance measurement mode; the channels of the thermocouple are sequentially selected through the measurement channel selection switch and the measurement data of the insulation resistance measuring instrument is recorded. The present invention uses one-time connection and does not require frequent wire replacement operations to improve the work execution efficiency and shorten the overhaul working hours.

Description

Technical Field

[0001] The present invention relates to the technical field of core thermocouple maintenance, and particularly to a special performance testing device and testing method for thermocouples in the core measurement system of nuclear power plants. Background Art

[0002] The thermocouples in the core measurement system are used to continuously monitor the temperature of the reactor coolant outlet, and provide information such as subcooling margin and saturation temperature to the operator to reflect the reactor temperature situation. A total of 40 thermocouples are installed in the system, divided into two columns A / B, with 20 thermocouples in each column. After each major overhaul, continuity and insulation resistance performance tests need to be carried out on the thermocouples to ensure the availability of the thermocouples, to identify and discover possible equipment failures in advance, and to provide guarantee for the reliable operation of the equipment in the next cycle.

[0003] According to the current working method, it is necessary to remove all the thermocouple wirings and measure continuity and insulation resistance one by one. During the measurement process, it is necessary to arrange personnel to verify the equipment code, confirm the correct test connection, and operate the instrument for measurement. For one column of thermocouples, 40 operations need to be repeated, and the overall operation time is relatively long, and there is also a certain risk of human error. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a special performance testing device and testing method for thermocouples in the core measurement system of nuclear power plants, which uses one-time connection and does not require frequent wire replacement operations to improve work execution efficiency and shorten maintenance man-hours.

[0005] The present invention provides a special performance testing device for thermocouples in the core measurement system of nuclear power plants, including: a thermocouple test terminal block, a test mode selection switch, a channel selection switch, a continuity measurement interface, and an insulation resistance measurement interface;

[0006] The thermocouple test terminal block is connected to the test thermocouple;

[0007] The channel selection switch is respectively connected to the thermocouple test terminal block and the test mode selection switch;

[0008] The test mode selection switch is respectively connected to the connectivity measurement interface and the insulation resistance measurement interface;

[0009] One end of the insulation resistance measurement interface is connected to the ground wire.

[0010] Preferably, the thermocouple test terminal block is composed of thermocouple test terminal interfaces.

[0011] Preferably, the thermocouple test terminal interface adopts an SCM interface.

[0012] Preferably, a plurality of thermocouple terminal block interfaces are provided.

[0013] The channel selection switch selects to connect with the thermocouple terminal block interface, and one corresponding thermocouple channel is selected each time it is switched.

[0014] Preferably, 20 to 30 thermocouple terminal block interfaces are provided.

[0015] Preferably, the test mode selection switch, the continuity channel selection switch, the channel selection switch, the continuity measurement interface and the insulation resistance measurement interface are arranged in the test box.

[0016] Preferably, the connectivity measurement interface is also connected to a continuity measuring instrument;

[0017] The insulation resistance measurement interface is also connected to an insulation resistance measuring instrument.

[0018] The present invention also provides a special performance test method for thermocouples of a nuclear power plant core measurement system, including the following steps:

[0019] S1: Connect the thermocouple to the thermocouple test terminal block;

[0020] S2: Connect the continuity measuring instrument to the continuity measurement interface;

[0021] S3: Connect the insulation resistance measuring instrument to the insulation resistance measurement interface;

[0022] S4: Place the measurement mode selection switch in the continuity measurement mode;

[0023] S5: Sequentially select thermocouple channels through the measurement channel selection switch and record the measurement data of the continuity measuring instrument;

[0024] S6: Place the measurement mode selection switch in the insulation resistance measurement mode;

[0025] S7: Sequentially select thermocouple channels through the measurement channel selection switch and record the measurement data of the insulation resistance measuring instrument.

[0026] Preferably, a plurality of thermocouple terminal block interfaces are provided,

[0027] The channel selection switch selects to connect with the thermocouple terminal block interface, and one corresponding thermocouple channel is selected each time it is switched.

[0028] Preferably, 20 to 30 thermocouple terminal block interfaces are provided.

[0029] Compared with the prior art, the special performance test device for thermocouples of the core measurement system of a pressurized water reactor nuclear power plant of the present invention has the following beneficial effects:

[0030] 1. By connecting all thermocouples to a dedicated performance testing device, thermocouple and continuity measurements can be achieved, enabling the convenient and rapid completion of testing work;

[0031] 2. Compared with traditional measurement methods, the time required for testing can be significantly shortened;

[0032] 3. The efficiency of the thermocouple performance test for the core measurement system of nuclear power plants is effectively improved, the operation and maintenance costs of the power station are reduced, and the economic benefits of the power station are increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It shows a schematic diagram of a dedicated performance testing device for thermocouples in the core measurement system of a pressurized water reactor nuclear power plant;

[0034] In the figure, 1. Thermocouple test terminal block; 2. Channel selection switch; 3. Measurement mode selection switch; 4. Continuity measurement interface; 5. Insulation resistance measurement interface. DETAILED DESCRIPTION OF THE INVENTION

[0035] To further understand the present invention, the implementation scheme of the present invention will be described below in conjunction with embodiments. However, it should be understood that these descriptions are only for further explaining the features and advantages of the present invention, rather than limiting the present invention.

[0036] An embodiment of the present invention discloses a dedicated performance testing device for thermocouples in the core measurement system of a nuclear power plant, as Figure 1 shown, including: a thermocouple test terminal block 1, a test mode selection switch 3, a channel selection switch 2, a continuity measurement interface 4, and an insulation resistance measurement interface 5;

[0037] The thermocouple test terminal block 1 is connected to the test thermocouple;

[0038] The channel selection switch 2 is respectively connected to the thermocouple test terminal block 1 and the test mode selection switch 3;

[0039] The test mode selection switch 3 is respectively connected to the connectivity measurement interface 4 and the insulation resistance measurement interface 5;

[0040] One end of the insulation resistance measurement interface 5 is connected to the ground wire.

[0041] According to the present invention, the thermocouple test terminal block 1 is composed of thermocouple test terminal interfaces, and the thermocouple test terminal interfaces adopt SCM interfaces, which are convenient for direct plugging and unplugging.

[0042] A number of the thermocouple terminal block interfaces are provided, which can be 20 to 30. The channel selection switch selects to connect to the thermocouple terminal block interfaces, and each time it is switched, a corresponding thermocouple channel is selected.

[0043] Matched with the existing nuclear power plant design, 20 thermocouple terminal block interfaces are provided. A channel selection switch is used to select the corresponding thermocouple channel for thermocouple continuity and insulation resistance measurement. The switch can select 20 channels, and each time it is switched, a corresponding thermocouple channel is selected.

[0044] A test mode selection switch is used to select the insulation resistance or continuity measurement mode. After the mode is selected, only one test can be performed each time.

[0045] A continuity measurement interface is connected to a continuity test instrument to measure the value of thermocouple continuity, and a standard continuity measurement interface is adopted.

[0046] An insulation resistance measurement interface is connected to an insulation resistance test instrument to measure the value of thermocouple insulation resistance, and a standard insulation resistance measurement interface is adopted.

[0047] The advantages of the present invention are:

[0048] Standard thermocouple test connection terminal blocks are adopted, and the thermocouple can be directly plugged and unplugged on site to realize the connection and disconnection of the thermocouple, without the need for wire removal operation.

[0049] The measurement functions of thermocouple continuity and insulation resistance are switched in real time through the test mode switch.

[0050] Through the channel selection switch, each channel test is executed each time, avoiding the interference of other channels.

[0051] Universal continuity and insulation resistance measurement interfaces are adopted, which can facilitate the connection of standard measurement equipment for data measurement.

[0052] An embodiment of the present invention discloses a special performance test method for thermocouples in a nuclear power plant core measurement system, including the following steps:

[0053] S1: Connect the thermocouple to the thermocouple test terminal block 1;

[0054] S2: Connect the continuity measuring instrument to the continuity measurement interface 4;

[0055] S3: Connect the insulation resistance measuring instrument to the insulation resistance measurement interface 5;

[0056] S4: Place the measurement mode selection switch in the continuity measurement mode;

[0057] S5: Sequentially select the thermocouple channels through the measurement channel selection switch and record the measurement data of the continuity measuring instrument;

[0058] Several thermocouple terminal block interfaces are provided, which can be 20 to 30;

[0059] The channel selection switch selects to connect with the thermocouple terminal block interface, and one corresponding thermocouple channel is selected each time of switching.

[0060] S6: Set the measurement mode selection switch 3 to the insulation resistance measurement mode.

[0061] S7: Sequentially select the thermocouple channels through the measurement channel selection switch 3 and record the measurement data of the insulation resistance measuring instrument.

[0062] The description of the above embodiments is only used to help understand the method and its core idea of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0063] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A special performance test method for thermocouples in the core measurement system of a nuclear power plant, characterized in that Including the following steps: S1: Connect the thermocouple to the thermocouple test terminal block; S2: Connect the continuity measuring instrument to the continuity measurement interface; S3: Connect the insulation resistance measuring instrument to the insulation resistance measurement interface; S4: Place the measurement mode selection switch in the continuity measurement mode; S5: Select the thermocouple channels in sequence through the measurement channel selection switch and record the measurement data of the continuity measuring instrument; S6: Place the measurement mode selection switch in the insulation resistance measurement mode; S7: Select the thermocouple channels in sequence through the measurement channel selection switch and record the measurement data of the insulation resistance measuring instrument; The above method is based on a special performance test device for thermocouples of the nuclear power plant core measurement system. The special performance test device for thermocouples of the nuclear power plant core measurement system includes: a thermocouple test terminal block, a test mode selection switch, a channel selection switch, a continuity measurement interface, and an insulation resistance measurement interface; The thermocouple test terminal block is connected to the test thermocouple; The channel selection switch is respectively connected to the thermocouple test terminal block and the test mode selection switch; The test mode selection switch is respectively connected to the connectivity measurement interface and the insulation resistance measurement interface; One end of the insulation resistance measurement interface is connected to the ground wire.

2. The special performance test method for the thermocouple of the nuclear power plant core measurement system according to claim 1, characterized in that, The thermocouple test terminal block is composed of thermocouple test terminal interfaces, and a number of the thermocouple test terminal interfaces are provided; The channel selection switch is selected to be connected to the thermocouple test terminal interface, and each time it is switched, a corresponding thermocouple channel is selected.

3. The special performance test method for the thermocouple of the nuclear power plant core measurement system according to claim 1, characterized in that The thermocouple test terminal test row interfaces are provided with 20 to 30.

4. The special performance test method for thermocouples of the nuclear power plant core measurement system according to claim 1, characterized in that, The thermocouple test terminal interface adopts an SCM interface.

5. The special performance test method for thermocouples of the nuclear power plant core measurement system according to claim 1, characterized in that, The test mode selection switch, the continuity channel selection switch, the channel selection switch, the continuity measurement interface, and the insulation resistance measurement interface are arranged in the test box body.

6. The special performance test method for the thermocouple of the nuclear power plant core measurement system according to claim 1, characterized in that, The connectivity measurement interface is also connected to the continuity measuring instrument; The insulation resistance measurement interface is also connected to the insulation resistance measuring instrument.

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