A device and method for automatically sampling and analyzing gamma nuclides in a primary loop of a nuclear power plant

Abstract

This invention belongs to the field of nuclear power plant chemistry, specifically relating to an automated sampling and analysis device and method for primary loop gamma nuclides in nuclear power plants. The device includes an automated sampling unit and an automated analysis unit. The automated sampling unit automatically sweeps the coolant in the glove box of the primary loop sampling system, discharging the waste liquid generated during sweeping to the three-waste system glove box, and automatically sampling the coolant in the glove box of the primary loop sampling system. The automated analysis unit automatically receives the coolant sample taken by the automated sampling unit and automatically analyzes the coolant sample. This invention enables automated sweeping and sampling, ensuring accurate quantification of the sample, and automatically analyzing and storing the sample, effectively reducing the labor costs of sampling and analysis and lowering the radiation dose to personnel.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant chemistry, specifically relating to an automatic sampling and analysis device and method for primary loop gamma nuclides in nuclear power plants. Background Technology

[0002] According to the radiochemical technical specifications for pressurized water reactor nuclear power plants, it is necessary to sample and analyze gamma nuclides in the primary coolant of the nuclear power plant weekly. The existing method is to manually collect samples and send them to the laboratory for analysis, which has the problems of low work efficiency and high radiation dose to personnel. To solve the above problems, an automated primary coolant gamma nuclide analysis device and method for nuclear power plants have been developed. Summary of the Invention

[0003] The purpose of this invention is to provide an automated sampling and analysis device and method for primary loop gamma nuclides in nuclear power plants. This device can automatically scan liquids and collect samples, ensuring accurate quantification of samples, and automatically analyze and store samples, effectively reducing the labor costs of sampling and analysis and lowering the radiation dose to personnel.

[0004] Technical solution to achieve the purpose of this invention:

[0005] An automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants is disclosed. The device comprises: an automated sampling unit and an automated analysis unit. The automated sampling unit is used to automatically sweep the coolant in the glove box of the primary loop sampling system, discharge the waste liquid generated from the sweeping to the three wastes system glove box, and automatically sample the coolant in the glove box of the primary loop sampling system. The automated analysis unit is used to automatically receive the coolant sample taken by the automated sampling unit and automatically analyze the coolant sample.

[0006] Furthermore, the device also includes a sample storage unit for storing coolant samples analyzed by the automated analysis unit.

[0007] Furthermore, the automated sampling unit includes a metering pump, a balance sensor, a solenoid valve, and a sampling bottle; the automated analysis unit includes a gamma-ray nuclide analyzer, a computer, and a robotic arm. The glove box of the primary sampling system is connected to the metering pump via a sampling pipeline. A solenoid valve is connected to the outlet of the metering pump. A sampling bottle is positioned below the solenoid valve, and a balance sensor is positioned below the sampling bottle. The balance sensor is connected to the metering pump and the solenoid valve. The balance sensor measures the coolant sample content in the sampling bottle and sends the measurement signal to the metering pump and the solenoid valve to control their opening and closing. A robotic arm, an intelligent robotic arm, is positioned outside the sampling bottle to grasp the sampling bottle and place it inside or remove it from the gamma-ray nuclide analyzer. The gamma-ray nuclide analyzer is connected to the computer to automatically analyze the coolant sample in the sampling bottle and generate analysis results. The analysis results are then sent to the computer, which summarizes the analysis results.

[0008] Furthermore, the metering pump outlet is also connected to a sweeping pipeline, and the three wastes system glove box is connected to the metering pump outlet via the sweeping pipeline; the waste liquid generated by sweeping the primary loop sampling system glove box is discharged to the three wastes system glove box via the sampling pipeline, metering pump, and sweeping pipeline.

[0009] Furthermore, the sample storage unit includes a sample storage device for storing sample vials removed from the gamma nuclide analyzer by the robotic arm after analysis.

[0010] Furthermore, the automated sampling unit also includes a cap tightening device. The cap tightening device is located above the sampling bottle and is connected to a balance sensor. The cap tightening device receives the measurement signal sent by the balance sensor. After the coolant sampling is completed, the cap tightening device tightens the cap of the sampling bottle to the sampling bottle.

[0011] Furthermore, the robotic arm can automatically identify the analysis progress of the sample in the sampling bottle, accurately place the sampling bottle containing the coolant sample that needs to be analyzed multiple times into the gamma nuclide analyzer, and perform multiple sample analyses on the coolant sample in the same sampling bottle.

[0012] Furthermore, the gamma nuclide analyzer is equipped with a sealed lead chamber, and a lead chamber door is provided on the lead chamber.

[0013] Furthermore, the automated sampling unit also includes a three-way valve, and the primary sampling system glove box is connected to a sampling pipeline via the three-way valve.

[0014] An automated sampling and analysis method for primary loop gamma nuclides in nuclear power plants, the method comprising:

[0015] Step 1: Before taking coolant samples, clean the glove box of the primary loop sampling system.

[0016] Step 2: The coolant in the glove box of the primary loop sampling system is collected into the sampling bottle. The coolant sample content in the sampling bottle is measured by the balance sensor, and the measurement signal is sent to the metering pump and the solenoid valve. When the measurement signal meets the preset coolant sample sampling requirement, the metering pump stops, the solenoid valve closes, and the coolant sampling is completed.

[0017] Step 3: The bottle cap tightening device receives the measurement signal sent by the balance sensor and tightens the bottle cap of the sampling bottle to the sampling bottle.

[0018] Step 4: The robotic arm picks up the sampling bottle and places it inside the gamma nuclide analyzer;

[0019] Step 5: The gamma nuclide analyzer automatically analyzes the coolant sample in the sampling bottle and generates analysis results. The analysis results are then sent to the computer, and the computer's data platform summarizes the analysis results.

[0020] Step 6: The robotic arm picks up the sampling bottle from the gamma nuclide analyzer and places it in the sample storage device to store the sampling bottle.

[0021] Step 7: The robotic arm accurately places the sampling bottle containing the coolant sample that needs to be analyzed multiple times into the gamma nuclide analyzer, and performs multiple sample analyses on the coolant sample in the same sampling bottle.

[0022] The beneficial technical effects of this invention are as follows:

[0023] 1. The present invention provides an automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants. By adding a sampling pipeline to the glove box of the primary loop sampling system and a liquid sweeping pipeline to the glove box of the three waste systems, and installing a metering pump, the device realizes the automatic liquid sweeping function of the glove box of the primary loop sampling system. The metering pump can realize quantitative liquid sweeping, ensuring the representativeness of the sampling and reducing the generation of highly radioactive waste liquid.

[0024] 2. The automatic sampling and analysis device for primary loop gamma nuclides provided by the present invention is suitable for the automated sampling structure of nuclear power plants. By setting a balance sensor below the sampling bottle, the measurement signal is fed back to the metering pump and the outlet solenoid valve to ensure accurate and quantitative sampling.

[0025] 3. The present invention provides an automatic sampling and analysis device for γ nuclides in a primary loop of a nuclear power plant. In the analysis unit, the instrument analysis results are automatically captured by an intelligent robotic arm and transmitted to a computer data platform for aggregation via a 5G network.

[0026] 4. The present invention provides an automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants. In the storage unit, a sample storage device with more than 36 sampling bottle storage points is designed to meet the requirement of storing multiple samples at the same time. The lead material used in the storage part reduces the radiation dose to personnel.

[0027] 5. The present invention provides an automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants, which realizes automated transfer of samples between the sampling unit, the analysis unit and the sample storage unit through an intelligent robotic arm.

[0028] 6. The automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants provided by this invention can effectively improve work efficiency and reduce personnel radiation dose. According to the radiochemical technical specifications for pressurized water reactor nuclear power plants, gamma nuclides need to be sampled and analyzed twice a week in the primary loop coolant of the nuclear power plant, with each sampling requiring approximately 2 μSv of radiation. Considering that the same sample needs to be analyzed three times, at T0, T0+3d, and T0+7d, with each analysis lasting 1 hour, this invention will reduce labor costs by at least 6 hours per week and reduce radiation exposure by 4 μSv; annually, it will reduce labor costs by at least 312 hours and reduce radiation exposure by 208 μSv. Attached Figure Description

[0029] Figure 1 A schematic diagram of an automated sampling and analysis device for γ nuclides in a primary loop of a nuclear power plant, provided by the present invention;

[0030] In the diagram: 1- Glove box for primary loop sampling system; 2- Glove box for waste system; 3- Metering pump; 4- Balance sensor; 5- Sample storage device; 6- Gamma nuclide analyzer; 7- Computer; 8- Robotic arm; 9- Bottle cap tightening device; 10- Solenoid valve; 11- Three-way valve; 12- Sampling bottle; 13- Lead chamber door. Detailed Implementation

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0032] like Figure 1 As shown, the present invention provides an automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants. The device includes: a primary loop sampling system glove box 1, a waste system glove box 2, a metering pump 3, a balance sensor 4, a sample storage device 5, a gamma nuclide analyzer 6, a computer 7, a robotic arm 8, a bottle cap tightening device 9, a solenoid valve 10, a three-way valve 11, a sampling bottle 12, and a lead chamber door 13.

[0033] An automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants includes an automated sampling unit, an automated analysis unit, and a sample storage unit. The automated sampling unit is used to automatically sweep the coolant in the glove box 1 of the primary loop sampling system, discharge the waste liquid generated from the sweeping to the three-waste system glove box 2, and automatically sample the coolant in the glove box 1 of the primary loop sampling system. The automated analysis unit is used to automatically receive the coolant sample taken by the automated sampling unit and automatically analyze the coolant sample. The sample storage unit is used to store the coolant sample after analysis by the automated analysis unit.

[0034] The automated sampling unit includes: metering pump 3, balance sensor 4, bottle cap tightening device 9, solenoid valve 10, three-way valve 11, and sampling bottle 12; the automated analysis unit includes: gamma nuclide analyzer 6, computer with 5G network 7, robotic arm 8, and gamma nuclide analyzer lead chamber door 13; the sample storage unit includes: sample storage device 5.

[0035] The primary sampling system glove box 1 is connected to a sampling pipeline via a three-way valve 11. The primary sampling system glove box 1 is connected to a metering pump 3 via the sampling pipeline. The outlet of the metering pump 3 is connected to a solenoid valve 10 and a liquid sweeping pipeline. The waste system glove box 2 is connected to the outlet of the metering pump 3 via a liquid sweeping pipeline.

[0036] Before taking coolant samples, the glove box 1 of the primary loop sampling system is scavenged. The waste liquid generated during scavenging is discharged to the glove box 2 of the three waste systems via the sampling pipeline, metering pump 3, and scavenging pipeline.

[0037] A sampling bottle 12 is located below the solenoid valve 10, and a balance sensor 4 is located below the sampling bottle 12. The balance sensor 4 is connected to the metering pump 3 and the solenoid valve 10. After the glove box 1 of the primary loop sampling system is emptied, the coolant in the glove box 1 of the primary loop sampling system is sampled. The coolant sample is collected in the sampling bottle 12 through the sampling pipeline, the metering pump 3, and the solenoid valve 10. The coolant sample content in the sampling bottle 12 is measured by the balance sensor 4, and the measurement signal is sent to the metering pump 3 and the solenoid valve 10. When the measurement signal meets the preset coolant sample sampling requirement, the metering pump 3 stops, the solenoid valve 10 closes, and the coolant sampling is completed.

[0038] A cap tightening device 9 is provided above the sampling bottle 12. The cap tightening device 9 is connected to the balance sensor 4. The cap tightening device 9 receives the measurement signal sent by the balance sensor 4. After the coolant sampling is completed, the cap tightening device 9 tightens the cap of the sampling bottle 12 to the sampling bottle 12.

[0039] The gamma nuclide analyzer 6 is a high-purity gamma spectrometer. The gamma nuclide analyzer 6 is equipped with a sealed lead chamber, and the lead chamber has a lead chamber door 13.

[0040] A robotic arm 8 is installed on the outside of the sampling bottle 12. The robotic arm 8 is an intelligent robotic arm that can automatically identify the sampling bottle 12. After the sampling bottle 12 has finished sampling and the cap of the sampling bottle 12 has been tightened, the robotic arm 8 grabs the sampling bottle 12, pushes open the lead chamber door 13, places the sampling bottle 12 into the lead chamber of the gamma nuclide analyzer 6, and closes the lead chamber door 13.

[0041] The gamma nuclide analyzer 6 is connected to the computer 7. After receiving the sampling bottle 12, the gamma nuclide analyzer 6 automatically analyzes the coolant sample in the sampling bottle 12 and generates analysis results. The analysis results are then sent to the computer 7, and the data platform of the computer 7 summarizes the analysis results.

[0042] After the coolant sample in the sampling bottle 12 is analyzed, the robotic arm 8 pushes open the lead chamber door 13, grabs the sampling bottle 12 from the lead chamber of the gamma nuclide analyzer 6, and places the sampling bottle 12 in the sample storage device 5 to store the sampling bottle 12.

[0043] The robotic arm 8 can automatically identify the analysis progress of the sample in the sampling bottle 12 and accurately place the sampling bottle 12 containing the coolant sample that needs to be analyzed multiple times into the lead chamber of the gamma nuclide analyzer 6, and perform multiple sample analyses on the coolant sample in the same sampling bottle 12.

[0044] According to the radiochemical technical specifications for pressurized water reactor nuclear power plants, primary loop gamma nuclides need to be analyzed once each at T0 (the day of sampling), T0+3d (the third day after sampling), and T0+7d (the seventh day after sampling) to promote the decay of short-half-life nuclides and improve the accuracy of measurements. Therefore, the robotic arm 8 can automatically identify the analytical progress of the sample in the sampling vial 12. After the coolant sample in the sampling vial 12 is analyzed on day T0, the sampling vial 12 is placed in the sample storage device 5 for storage. On T0+3d and T0+7d, the same sampling vial 12 is retrieved from the sample storage device 5 and taken to the lead chamber of the gamma nuclide analyzer 6 for analysis of the coolant sample on T0+3d and T0+7d.

[0045] The automatic sampling and analysis device for primary loop gamma nuclides provided by this invention is used to perform automatic sampling and analysis of primary loop gamma nuclides, specifically including the following steps:

[0046] Step 1: Before taking the coolant sample, the glove box 1 of the primary loop sampling system is scavenged. The waste liquid generated by scavenging is discharged to the glove box 2 of the three waste systems through the sampling pipeline, metering pump 3, and scavenging pipeline.

[0047] Step 2: After the primary loop sampling system glove box 1 is scavenged, the coolant in the primary loop sampling system glove box 1 is sampled. The coolant sample is collected into the sampling bottle 12 through the sampling pipeline, metering pump 3, and solenoid valve 10. The coolant sample content in the sampling bottle 12 is measured by the balance sensor 4, and the measurement signal is sent to the metering pump 3 and solenoid valve 10. When the measurement signal meets the preset coolant sample sampling requirement content, the metering pump 3 stops, the solenoid valve 10 closes, and the coolant sampling is completed.

[0048] Step 3: After the coolant sampling is completed, the cap tightening device 9 receives the measurement signal sent by the balance sensor 4 and tightens the cap of the sampling bottle 12 to the sampling bottle 12.

[0049] Step 4: After tightening the cap of the sampling bottle 12, the robotic arm 8 grabs the sampling bottle 12, pushes open the lead chamber door 13, places the sampling bottle 12 into the lead chamber of the gamma nuclide analyzer 6, and closes the lead chamber door 13.

[0050] Step 5: After receiving the sampling bottle 12, the gamma nuclide analyzer 6 automatically analyzes the coolant sample in the sampling bottle 12 and generates analysis results. The analysis results are then sent to the computer 7, and the data platform of the computer 7 summarizes the analysis results.

[0051] Step 6: After the coolant sample in the sampling bottle 12 has been analyzed, the robotic arm 8 pushes open the lead chamber door 13, grabs the sampling bottle 12 from the lead chamber of the gamma nuclide analyzer 6, and places the sampling bottle 12 in the sample storage device 5 to store the sampling bottle 12.

[0052] Step 7: The robotic arm 8 accurately places the sampling bottle 12 containing the coolant sample that needs to be analyzed multiple times into the lead chamber of the gamma nuclide analyzer 6, and performs multiple sample analyses on the coolant sample in the same sampling bottle 12.

[0053] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments, and various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. All contents not described in detail in the present invention can be derived from existing technologies.

Claims

1. An automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants, characterized in that, The device includes: an automated sampling unit and an automated analysis unit; the automated sampling unit is used to automatically sweep the coolant in the glove box (1) of the primary sampling system, discharge the waste liquid generated by the sweeping to the glove box (2) of the three wastes system, and automatically sample the coolant in the glove box (1) of the primary sampling system; the automated analysis unit is used to automatically receive the coolant sample taken by the automated sampling unit and automatically analyze the coolant sample. The device also includes a sample storage unit for storing coolant samples analyzed by the automated analysis unit. The automated sampling unit includes: a metering pump (3), a balance sensor (4), a solenoid valve (10), and a sampling bottle (12). The automated analysis unit includes: a gamma nuclide analyzer (6), a computer (7), and a robotic arm (8). The glove box (1) of the primary sampling system is connected to the metering pump (3) via a sampling pipeline. The outlet of the metering pump (3) is connected to the solenoid valve (10). A sampling bottle (12) is placed below the solenoid valve (10). A balance sensor (4) is placed below the sampling bottle (12). The balance sensor (4) is connected to the metering pump (3) and the solenoid valve (10). The balance sensor (4) is used to measure the coolant sample in the sampling bottle (12). The content is measured and the measurement signal is sent to the metering pump (3) and the solenoid valve (10) to control the opening or closing of the metering pump (3) and the solenoid valve (10); a robotic arm (8) is provided on the outside of the sampling bottle (12). The robotic arm (8) is an intelligent robotic arm used to grab the sampling bottle (12) and place the sampling bottle (12) in the γ-nucleoside analyzer (6) or take the sampling bottle (12) out of the γ-nucleoside analyzer (6); the γ-nucleoside analyzer (6) is connected to the computer (7) to automatically analyze the coolant sample in the sampling bottle (12) and generate analysis results, and send the analysis results to the computer (7). The computer (7) summarizes the analysis results.

2. The automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants according to claim 1, characterized in that, The metering pump (3) outlet is also connected to a sweeping pipeline, and the three waste system glove box (2) is connected to the metering pump (3) outlet via the sweeping pipeline; the waste liquid generated by sweeping the primary loop sampling system glove box (1) is discharged to the three waste system glove box (2) via the sampling pipeline, metering pump (3), and sweeping pipeline.

3. The automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants according to claim 1, characterized in that, The sample storage unit includes a sample storage device (5) for storing the sample vials (12) taken out of the gamma nuclide analyzer (6) by the robotic arm (8) after analysis by the gamma nuclide analyzer (6).

4. The automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants according to claim 1, characterized in that, The automated sampling unit also includes a cap tightening device (9). The cap tightening device (9) is provided above the sampling bottle (12). The cap tightening device (9) is connected to the balance sensor (4). The cap tightening device (9) receives the measurement signal sent by the balance sensor (4). After the coolant sampling is completed, the cap tightening device (9) tightens the cap of the sampling bottle (12) to the sampling bottle (12).

5. The automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants according to claim 1, characterized in that, The robotic arm (8) can automatically identify the analysis progress of the sample in the sampling bottle (12), accurately place the sampling bottle (12) containing the coolant sample that needs to be analyzed multiple times into the γ-nucleoside analyzer (6), and perform multiple sample analyses on the coolant sample in the same sampling bottle (12).

6. The automatic sampling and analysis device for primary loop gamma nuclides in nuclear power plants according to claim 1, characterized in that, The gamma nuclide analyzer (6) is equipped with a sealed lead chamber, and a lead chamber door (13) is opened on the lead chamber.

7. The automated sampling and analysis device for primary loop gamma nuclides in nuclear power plants according to claim 1, characterized in that, The automated sampling unit also includes a three-way valve (11), and the primary sampling system glove box (1) is connected to a sampling pipeline through the three-way valve (11).

8. An automated sampling and analysis method for γ-nuclides in the primary loop of a nuclear power plant, characterized in that, The method includes: Step 1: Before taking the coolant sample, the glove box (1) of the primary loop sampling system is swabbed. Step 2: The coolant in the glove box (1) of the primary sampling system is collected into the sampling bottle (12). The coolant sample content in the sampling bottle (12) is measured by the balance sensor (4), and the measurement signal is sent to the metering pump (3) and the solenoid valve (10). When the measurement signal meets the preset coolant sample sampling requirement content, the metering pump (3) stops, the solenoid valve (10) closes, and the coolant sampling is completed. Step 3: The cap tightening device (9) receives the measurement signal sent by the balance sensor (4) and tightens the cap of the sampling bottle (12) to the sampling bottle (12); Step 4: The robotic arm (8) picks up the sampling bottle (12) and places the sampling bottle (12) into the γ-nucleoside analyzer (6); Step 5: The γ-nucleoside analyzer (6) automatically analyzes the coolant sample in the sampling bottle (12) and generates analysis results. The analysis results are sent to the computer (7), and the data platform of the computer (7) summarizes the analysis results. Step 6: The robotic arm (8) grabs the sampling bottle (12) from the γ-nucleoside analyzer (6) and places the sampling bottle (12) in the sample storage device (5) to store the sampling bottle (12). Step 7: The robotic arm (8) accurately places the sampling bottle (12) containing the coolant sample that needs to be analyzed multiple times into the γ-nucleoside analyzer (6) and performs multiple sample analyses on the coolant sample in the same sampling bottle (12).

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