A decontaminating agent for components of a pressurized water reactor nuclear power plant, a method of deployment and a decontamination device

Abstract

The present application relates to the technical field of nuclear facility radioactive chemical decontamination, and particularly relates to a pressurized water reactor nuclear power plant component decontaminant, a configuration method and a decontamination device, which comprises a dispensing assembly, including an ultrasonic motor, a frame arranged at the bottom end of the ultrasonic motor, a water pump mounted at the top end of the frame, a dispensing tank for containing dispensing raw materials mounted on the side wall of the water pump, and a delivery pipe arranged at the bottom end of the dispensing tank; and a decontamination assembly, including a water tank arranged at the top end of the frame, a decontamination piece for containing decontaminants mounted at the top end of the water tank, and a stirring box sealed by moving one half of the convex plate upwards, wherein the workpiece is cleaned by starting the cleaning piece at this time, and the workpiece is cleaned simultaneously from top to bottom, so that the cleaning efficiency of the workpiece is effectively improved, the composition of the decontaminant is simple, the decontaminant is easy to prepare, the raw materials are easy to obtain, the decontaminant is low-toxic or non-toxic, and the compounding performance of each component of the decontaminant is good.

Description

Technical Field

[0001] This invention relates to the field of radiochemical decontamination technology for nuclear facilities, and in particular to a decontamination agent, preparation method, and decontamination device for components of pressurized water reactor nuclear power plants. Background Technology

[0002] Nuclear power is a clean energy source with characteristics such as stability, high efficiency, and scalability. Pressurized water reactors (PWRs) have become the main reactor type for newly built nuclear power plants in my country due to their advantages such as compact structure, small size, high power density, deep average burnup, low risk of radioactive fission products escaping, good power self-stabilization and self-adjustment characteristics, and high safety and reliability. During the operation of a nuclear reactor, the reactor core will generate and gradually accumulate activation corrosion products, which will pass through the entire primary loop via cooling water. This will cause the pipes of the primary loop cooling system to be filled with radioactive nuclides, which will gradually deposit on stainless steel pipes and related equipment under high temperature and high pressure conditions, creating significant safety hazards. Chemical decontamination processes can effectively reduce the amount of radioactive deposits in the pipes of the primary loop cooling system, thereby reducing the risk of radiation damage to operators from the reactor's primary loop cooling system. Regular decontamination of the reactor's primary loop has become routine.

[0003] In reality, the environment inside the primary circuit pressure vessel is quite complex, resulting in a complex composition of deposited dirt. Currently, a single decontamination agent cannot completely remove dirt from the primary circuit equipment components of a pressurized water reactor nuclear power plant. Furthermore, removing oil from equipment components is quite troublesome during the rinsing process, and the rinsing time is long due to insufficient rinsing. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problem that the above-mentioned single decontamination reagents cannot completely remove contaminants from the primary loop equipment components of pressurized water reactor nuclear power plants, this invention is proposed.

[0006] Therefore, one of the objectives of this invention is to provide a decontaminant for pressurized water reactor nuclear power plant components.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: comprising, by weight, the following components: 3-8 parts citric acid, 1-3 parts glycolic acid, 0.2-4 parts ethanolamine, 0.1-1 parts polyacrylic acid, 0.5-2 parts diethylenetriaminepentaacetic acid and 82.0-95.2 parts water, wherein the above components are finally introduced into a mixing tank and mixed evenly.

[0008] The beneficial effects of the decontamination agent for pressurized water reactor nuclear power plant components described in this invention are as follows: The decontamination agent of this invention has a simple composition, is easy to prepare, and the raw materials are readily available, low in toxicity or non-toxic. Moreover, the components of the decontamination agent have good compatibility. The loaded polyacrylic acid and diethylenetriaminepentaacetic acid improve the decontamination effect of foam on particulate oxides and colloidal nuclides. At the same time, the decontamination agent has low corrosivity to materials, poses no risk of corrosion damage to equipment materials, and the decontamination agent is simple to use and easy to operate on site.

[0009] In practical use, there is still a problem that there is no corresponding decontamination agent for the decontamination of nuclear power plant components, resulting in poor decontamination effect.

[0010] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a method for preparing a decontamination agent for pressurized water reactor nuclear power plant components, comprising the above-mentioned decontamination agent for pressurized water reactor nuclear power plant components, and further comprising:

[0011] Diethylenetriaminepentaacetic acid was added to ultrapure water, followed by the addition of ethanolamine at a 1:1 mass ratio. The mixture was then poured into a mixing tank and stirred for 2–5 minutes with a rotating stirring rod to completely dissolve the diethylenetriaminepentaacetic acid.

[0012] The aqueous solution obtained in the previous step is then added to the mixing tank again, and the stirring rod is rotated and stirred for 1 to 2 minutes to completely dissolve the polyacrylic acid.

[0013] The aqueous solution obtained in the previous mixing tank is then added to the aqueous solution again. After slowly rotating the stirring rod, the citric acid and glycolic acid are completely dissolved.

[0014] Ethanolamine, citric acid, and glycolic acid were added to the solution obtained in the previous stirring tank to adjust the pH value of the solution. After adjusting the pH value to 1.5-2.5, an offline chemical decontaminant for primary loop equipment components of pressurized water reactor nuclear power plants was obtained.

[0015] The beneficial effects of the decontamination agent preparation method for pressurized water reactor nuclear power plant components described in this invention are as follows: This method involves adding diethylenetriaminepentaacetic acid (DTA) to ultrapure water, then adding ethanolamine in a certain proportion, followed by manual stirring to completely dissolve the DTA. Next, polyacrylic acid is added and stirred again to ensure complete dissolution. This stepwise dissolution process allows for thorough mixing of various components, enhancing the uniformity and stability of the decontamination agent. Adding citric acid and glycolic acid to the solution and adjusting the pH to 1.5–2.5 enhances the acidity of the decontamination agent, potentially making it more effective in removing stubborn stains and impurities. Due to the special nature of the primary loop equipment components in nuclear power plants, the use of offline chemical decontamination agents can effectively remove stains without damaging the equipment. This decontamination agent, utilizing the synergistic effect of various chemical components, may have a good removal effect on different types of stains.

[0016] In actual use, there are still problems such as the cumbersome rinsing process of the equipment parts for removing oil stains, and the long rinsing time due to insufficient rinsing.

[0017] To solve the above-mentioned technical problems, the present invention also provides the following technical solution: a decontamination device, including the above-mentioned decontamination agent preparation method for pressurized water reactor nuclear power plant components, and further including a dispensing component, including an ultrasonic motor and a frame disposed at the bottom of the ultrasonic motor, a water pump installed at the top of the frame, a dispensing tank for holding the agent raw materials installed on the side wall of the water pump, and a conveying pipe disposed at the bottom of the dispensing tank.

[0018] The decontamination assembly includes a water tank disposed at the top of the frame, a decontamination component for holding a decontamination agent is installed at the top of the water tank, and the water tank is used to import and store the decontamination agent that has been mixed inside the decontamination component. The top of the decontamination component is provided with a cleaning component for using the decontamination agent to decontaminate the workpiece.

[0019] In a preferred embodiment of the decontamination device of the present invention, the decontamination component includes a partition plate disposed inside the water tank, a protrusion plate for introducing the mixed decontamination agent into the water tank is installed at the top of the partition plate, and a telescopic cylinder is installed at the top of the protrusion plate, the top of the telescopic cylinder being connected to the frame.

[0020] As a preferred embodiment of the decontamination device of the present invention, the decontamination component further includes a baffle plate disposed at the end of the piston rod of the telescopic cylinder, a placement rod is installed at the top of the baffle plate, and a cover plate is provided on the circumferential side wall of the telescopic cylinder.

[0021] In a preferred embodiment of the decontamination device of the present invention, a connecting plate is provided at the top of the cover plate, a movable plate is installed at the bottom of the connecting plate, the bottom of the movable plate extends through the cover plate to the outside, so that the movable plate and the cover plate are slidably connected, and a through groove is installed at the top of the cover plate, a semi-circular block is installed inside the through groove, and a triangular block is installed on the side wall of the semi-circular block and connected to the cover plate.

[0022] In a preferred embodiment of the decontamination device of the present invention, a mixing tank for holding a decontamination agent is installed at the top of the connecting plate, a guide pipe is installed at the top of the mixing tank, a servo motor is installed at the top of the guide pipe, a fixed shaft is installed at the output end of the servo motor, and a stirring rod is installed on the side wall of the fixed shaft.

[0023] In a preferred embodiment of the cleaning device of the present invention, the cleaning component includes a spray pipe disposed inside the water tank, a water guide pipe installed at the bottom end of the cover plate, a branch pipe installed on the side wall of the water guide pipe, and a nozzle installed at the bottom end of both the branch pipe and the water guide pipe.

[0024] In a preferred embodiment of the cleaning device of the present invention, the cleaning component includes a water inlet pipe disposed at the top of the water guide pipe, an inclined groove disposed inside the water inlet pipe, a water wheel disposed at the bottom end of the water inlet pipe, and a toggle block installed at the bottom end of the water wheel.

[0025] In a preferred embodiment of the decontamination device of the present invention, the actuating block includes a connecting plate disposed at the bottom end of the water wheel, a connecting shaft is installed inside the connecting plate, an actuating plate is sleeved on the side wall of the connecting shaft, a torsion spring is disposed between the connecting shaft and the actuating plate, a fixing rod is installed on the side wall of the actuating plate, a limit plate is installed at the bottom end of the fixing rod, a moving rod is installed at the bottom end of the limit plate, and a telescopic spring is sleeved on the side wall of the moving rod.

[0026] The beneficial effects of the decontamination device described in this invention are as follows: By activating the decontamination component, the workpiece to be decontaminated is moved downwards. During the downward movement, the connecting plate is lifted upwards by the protruding plate, allowing the decontaminant prepared in the mixing tank to be introduced into the water tank to decontaminate the workpiece. When the workpiece needs to be cleaned, moving half of the protruding plate upwards can seal the mixing tank. At this time, the cleaning component is activated to clean the workpiece, and the workpiece is cleaned from top to bottom simultaneously, which can effectively improve the cleaning efficiency of the workpiece. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0028] Figure 1 This is a schematic diagram of the overall decontamination device.

[0029] Figure 2 This is a rear view of the overall structure of the decontamination device.

[0030] Figure 3 This is a bottom view of the overall structure of the decontamination device.

[0031] Figure 4 This is a schematic diagram of the decontamination component structure of a decontamination device.

[0032] Figure 5 This is a schematic diagram showing the disassembled structure of the decontamination component of the decontamination device.

[0033] Figure 6 This is a cross-sectional structural diagram of the decontamination component of the decontamination device.

[0034] Figure 7 This is a schematic diagram of the semi-circular block structure of the decontamination device.

[0035] Figure 8 This is a schematic diagram of the second cleaning structure of the cleaning component of the decontamination device.

[0036] Figure 9 This is a cross-sectional view of the first cleaning structure of the cleaning component of the decontamination device.

[0037] Figure 10 This is a schematic diagram of the inclined groove position of the second cleaning structure of the cleaning component of the decontamination device.

[0038] Figure 11 This is a bottom view of the position of the moving rod of the second cleaning structure in the decontamination device.

[0039] Figure 12 This is a schematic diagram of the internal structure of the water inlet pipe of the second cleaning structure of the decontamination device.

[0040] Figure 13 This is a schematic diagram of the disassembled structure of the second cleaning structure of the cleaning component of the decontamination device, which is the actuating block.

[0041] Figure 14 for Figure 13 Enlarged view of point A in the image.

[0042] Figure label:

[0043] 100. Dispensing assembly; 101. Ultrasonic motor; 102. Frame; 103. Water pump; 104. Dispensing tank; 105. Delivery pipe;

[0044] 200. Stain removal assembly; 201. Water tank; 202. Stain removal component; 202a. Partition; 202b. Raised plate; 202c. Telescopic cylinder; 202d. Baffle; 202e. Storage rod; 202f. Cover plate; 202g. Connecting plate; 202h. Moving plate; 202i. Through groove; 202j. Semicircular block; 202k. Triangular block; 202l. Mixing tank; 202m. Feed guide pipe; 202n. Servo motor; 202p. Fixed shaft; 202q. Mixing rod; 203, Cleaning component; 203a, Spray pipe; 203b, Water guide pipe; 203c, Branch pipe; 203d, Sprayer head; 203e, Water inlet pipe; 203f, Inclined trough; 203g, Water wheel; 203h, Actuating block; 203h-1, Connecting plate; 203h-2, Connecting shaft; 203h-3, Actuating plate; 203h-4, Torsion spring; 203h-5, Fixing rod; 203h-6, Limiting plate; 203h-7, Moving rod; 203h-8, Telescopic spring. Detailed Implementation

[0045] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0046] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0047] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0048] Example 1

[0049] Reference Figures 1-4 This is the first embodiment of the present invention. This embodiment provides a decontamination agent for pressurized water reactor nuclear power plant components, comprising, by weight, the following components: 3-8 parts citric acid, 1-3 parts glycolic acid, 0.2-4 parts ethanolamine, 0.1-1 parts polyacrylic acid, 0.5-2 parts diethylenetriaminepentaacetic acid, and 82.0-95.2 parts water. The above components are then introduced into a mixing tank and mixed evenly.

[0050] Example 2

[0051] This embodiment is the second embodiment of the present invention, which provides a method for preparing a decontamination agent for a pressurized water reactor nuclear power plant component, including adding diethylenetriaminepentaacetic acid to ultrapure water, then adding ethanolamine at a mass ratio of 1:1, and then pouring it into a mixing tank and stirring with a rotating stirring rod for 2 to 5 minutes to completely dissolve the diethylenetriaminepentaacetic acid.

[0052] The aqueous solution obtained in the previous step is then added to the mixing tank again, and the stirring rod is rotated and stirred for 1 to 2 minutes to completely dissolve the polyacrylic acid.

[0053] The aqueous solution obtained in the previous mixing tank is then added to the aqueous solution again. After slowly rotating the stirring rod, the citric acid and glycolic acid are completely dissolved.

[0054] Ethanolamine, citric acid, and glycolic acid were added to the solution obtained in the previous stirring tank to adjust the pH value of the solution. After adjusting the pH value to 1.5-2.5, an offline chemical decontaminant for primary loop equipment components of pressurized water reactor nuclear power plants was obtained.

[0055] Simulated oxide film removal rate and material corrosion rate of X3CrNiMo13-4 main pump impeller material.

[0056] Comparative Example 1: 2 parts citric acid, 3 parts glycolic acid, 0.1 parts ethanolamine, 0.1 parts polyacrylic acid, 0.5 parts diethylenetriaminepentaacetic acid and 94.3 parts water;

[0057] Experiments show that the simulated oxide film removal rate of the main pump impeller material X3CrNiMo13-4 in a specific ratio of detergent is 88%, and the material corrosion rate is 0.04 g / (m). 2 .h).

[0058] Comparative Example 2: 2 parts citric acid, 2 parts glycolic acid, 0.1 parts ethanolamine, 0.1 parts polyacrylic acid, 0.5 parts diethylenetriaminepentaacetic acid and 95.3 parts water;

[0059] Experiments show that the simulated oxide film removal rate of the main pump impeller material X3CrNiMo13-4 in a specific ratio of detergent is 90%, and the material corrosion rate is 0.03 g / (m). 2 .h).

[0060] Comparative Example 3: 8 parts citric acid, 2 parts glycolic acid, 3 parts ethanolamine, 0.1 parts polyacrylic acid, 2 parts diethylenetriaminepentaacetic acid and 84.9 parts water;

[0061] Experiments show that the simulated oxide film removal rate of the main pump impeller material X3CrNiMo13-4 in a specific ratio of detergent is 92%, and the material corrosion rate is 0.05 g / (m). 2 .h).

[0062] Simulated oxide film removal rate and material corrosion rate of ZG04Cr20Ni9 impeller material for top-charge pumps.

[0063] Comparative Example 1: 2 parts citric acid, 1 part glycolic acid, 2 parts ethanolamine, 1 part polyacrylic acid, 1 part diethylenetriaminepentaacetic acid and 93 parts water;

[0064] Experiments show that the simulated oxide film removal rate of ZG04Cr20Ni9 impeller material in a specific ratio of detergent is 95%, and the material corrosion rate is 0.02 g / (m). 2 .h).

[0065] Comparative Example 2: 2 parts citric acid, 2 parts glycolic acid, 0.1 parts ethanolamine, 0.1 parts polyacrylic acid, 0.5 parts diethylenetriaminepentaacetic acid and 95.3 parts water;

[0066] Experiments show that the simulated oxide film removal rate of ZG04Cr20Ni9 impeller material in a specific ratio of detergent is 93%, and the material corrosion rate is 0.03 g / (m).2 The corrosion rate of .h) has increased.

[0067] Comparative Example 3: 1 part citric acid, 1 part glycolic acid, 1 part ethanolamine, 1 part polyacrylic acid, 1 part diethylenetriaminepentaacetic acid and 95 parts water;

[0068] Experiments show that the simulated oxide film removal rate of ZG04Cr20Ni9 impeller material in a specific ratio of detergent is 92%, and the material corrosion rate is 0.04 g / (m). 2 .h).

[0069] Simulated oxide film removal rate and material corrosion rate of ZG06Cr13Ni4Mo impeller for waste heat discharge pump.

[0070] Comparative Example 1: 2 parts citric acid, 2 parts glycolic acid, 0.1 parts ethanolamine, 0.1 parts polyacrylic acid, 1 part diethylenetriaminepentaacetic acid and 94.8 parts water;

[0071] Experiments show that the simulated oxide film removal rate of the ZG04Cr20Ni9 impeller material in a specific ratio of detergent is 88%, and the material corrosion rate is 0.03 g / (m). 2 .h).

[0072] Comparative Example 2: 3 parts citric acid, 1 part glycolic acid, 3 parts ethanolamine, 1 part polyacrylic acid, 2 parts diethylenetriaminepentaacetic acid and 90 parts water;

[0073] Experiments show that the simulated oxide film removal rate of ZG04Cr20Ni9 impeller material in a specific ratio of detergent is 96%, and the material corrosion rate is 0.03 g / (m). 2 .h).

[0074] Comparative Example 3: 2 parts citric acid, 2 parts glycolic acid, 2 parts ethanolamine, 2 parts polyacrylic acid, 2 parts diethylenetriaminepentaacetic acid and 90 parts water;

[0075] Experiments show that the simulated oxide film removal rate of the ZG04Cr20Ni9 impeller material in a specific ratio of detergent is 93%, and the material corrosion rate is 0.04 g / (m). 2 .h).

[0076] Table 1. Simulated oxide film removal rate and material corrosion rate of X3CrNiMo13-4 main pump impeller material in Example 2.

[0077]

[0078] As can be seen from the test results in Table 1, the increase in the amount of citric acid added significantly improved the oxide film removal rate of the main pump impeller material, while the corrosion rate of the material did not differ much.

[0079] Table 2. Simulated oxide film removal rate and material corrosion rate of ZG04Cr20Ni9 impeller material in Example 2.

[0080]

[0081] As can be seen from the test results in Table 2, reducing the proportion of water significantly improves the oxide film removal rate of the impeller material of the charging pump.

[0082] Table 3. Simulated oxide film removal rate and material corrosion rate of ZG06Cr13Ni4Mo impeller in Example 2.

[0083]

[0084]

[0085] In summary, Comparative Example 3 showed the best results in terms of oxide film removal rate and corrosion rate of the main pump impeller material, Comparative Example 1 showed the best results in terms of oxide film removal rate and corrosion rate of the charging pump impeller material, and Comparative Example 2 showed the best results in terms of oxide film removal rate and corrosion rate of the waste heat discharge pump impeller material.

[0086] Operating Procedure: Place the workpiece to be cleaned in the storage rod 202e of the ultrasonic cleaning chamber, then lower the workpiece into the water tank 201. Add the prepared cleaning agent to the water tank 201, raise the temperature, and maintain it at 75-90℃. Turn on the ultrasonic switch to generate water flow vibration, and clean the workpiece immersed in the cleaning agent for 1-8 hours. Afterward, remove the workpiece, drain the cleaning agent from the ultrasonic cleaning chamber, add demineralized water, and then clean the workpiece through the cleaning component 203 to remove any remaining dirt, completing the cleaning process.

[0087] Example 3

[0088] Reference Figures 1-14 This is the second embodiment of the present invention. The difference from the previous embodiment is that the dispensing component 100 includes an ultrasonic motor 101, a frame 102 disposed at the bottom of the ultrasonic motor 101, a water pump 103 installed at the top of the frame 102, a dispensing tank 104 for holding the additive raw materials installed on the side wall of the water pump 103, and a conveying pipe 105 disposed at the bottom of the dispensing tank 104.

[0089] The cleaning component 200 includes a water tank 201 disposed at the top of the frame 102. A cleaning component 202 for holding cleaning agent is installed at the top of the water tank 201. The water tank 201 is used to import and store the cleaning agent that has been mixed inside the cleaning component 202. A cleaning component 203 for cleaning the workpiece using the cleaning agent is disposed at the top of the cleaning component 202.

[0090] Furthermore, the cleaning component 202 includes a partition 202a disposed inside the water tank 201. The top of the partition 202a is equipped with a protruding plate 202b for introducing the mixed cleaning agent into the water tank 201. The top of the protruding plate 202b is equipped with a telescopic cylinder 202c, and the top of the telescopic cylinder 202c is connected to the frame 102.

[0091] Furthermore, the cleaning component 202 also includes a baffle 202d disposed at the end of the piston rod of the telescopic cylinder 202c, a storage rod 202e is installed on the top of the baffle 202d, and a cover plate 202f is disposed on the circumferential side wall of the telescopic cylinder 202c.

[0092] Furthermore, a connecting plate 202g is provided at the top of the cover plate 202f, and a movable plate 202h is installed at the bottom of the connecting plate 202g. The bottom of the movable plate 202h extends through the cover plate 202f to the outside, so that the movable plate 202h is slidably connected to the cover plate 202f. A through groove 202i is installed at the top of the cover plate 202f, and a semi-circular block 202j is installed inside the through groove 202i. A triangular block 202k is installed on the side wall of the semi-circular block 202j and is connected to the cover plate 202f.

[0093] Furthermore, a mixing tank 202l for holding the desiccant is installed at the top of the connecting plate 202g, a guide pipe 202m is installed at the top of the mixing tank 202l, a servo motor 202n is installed at the top of the guide pipe 202m, a fixed shaft 202p is installed at the output end of the servo motor 202n, and a stirring rod 202q is installed on the side wall of the fixed shaft 202p.

[0094] Furthermore, the cleaning component 203 includes a spray pipe 203a disposed inside the water tank 201, a water guide pipe 203b installed at the bottom end of the cover plate 202f, a branch pipe 203c installed on the side wall of the water guide pipe 203b, and a nozzle 203d installed at the bottom end of both the branch pipe 203c and the water guide pipe 203b.

[0095] Furthermore, the cleaning component 203 includes an inlet pipe 203e disposed at the top of the water guide pipe 203b, an inclined groove 203f disposed inside the inlet pipe 203e, a water wheel 203g disposed at the bottom end of the inlet pipe 203e, and an actuating block 203h installed at the bottom end of the water wheel 203g.

[0096] Furthermore, the actuating block 203h includes a connecting plate 203h-1 disposed at the bottom end of the water turbine 203g. A connecting shaft 203h-2 is installed inside the connecting plate 203h-1. An actuating plate 203h-3 is sleeved on the side wall of the connecting shaft 203h-2. A torsion spring 203h-4 is disposed between the connecting shaft 203h-2 and the actuating plate 203h-3. One end of the torsion spring 203h-4 is connected to the connecting shaft 203h-2. The torsion spring 203h-4 is connected to the actuating plate 203h-3 at one end away from the connecting shaft 203h-2. A fixing rod 203h-5 is installed on the side wall of the actuating plate 203h-3. A limit plate 203h-6 is installed at the bottom end of the fixing rod 203h-5. A moving rod 203h-7 is installed at the bottom end of the limit plate 203h-6. A telescopic spring 203h-8 is sleeved on the side wall of the moving rod 203h-7.

[0097] The rest of the structure is the same as in Example 2.

[0098] Operation process: Before starting the telescopic cylinder 202c, the various components of the detergent need to be introduced into the mixing tank 202l. Then, the servo motor 202n is started, which effectively drives the fixed shaft 202p to rotate. The rotating fixed shaft 202p drives the stirring rod 202q to stir the reagent evenly. While stirring, the workpiece to be cleaned is placed on the top of the placement rod 202e. Then, the telescopic cylinder 202c is started, which effectively drives the baffle 202d to move towards the water tank 201. The moving baffle 202d can move the workpiece on the placement rod 202e downward into the water tank 201. During the movement, the downward pressure causes the protruding plate 202b to press against the moving plate 202h, thereby driving the connecting plate 202g to move upward. The discharge port detaches from the semi-circular block 202j, thereby introducing the prepared detergent in the mixing tank 202l into the water tank 201. Since the discharge port of the mixing tank 202l is sealed by a semi-circular block, the residue of the reagent can be effectively reduced. Furthermore, the semi-circular block 202j is connected to the cover plate 202f by a triangular block 202k, the side wall of which is inclined, which can also effectively reduce the residue of the reagent. This can effectively increase the amount of reagent introduced into the water tank 201 and reduce the waste of the reagent. After the workpiece is cleaned, the telescopic cylinder 202c is activated to move the height of the protruding plate 202b upward by half, thereby reducing the pressure of the protruding plate 202b on the moving plate 202h, so that the semi-circular block 202j seals the mixing tank 202l. At the same time, the spray pipe 203a and the nozzle 203d are activated from the top and bottom. Since the top water pipe 203b is equipped with two spraying methods:

[0099] The first spraying method is as follows: a branch pipe 203c is set on the side wall of the water guide pipe 203b, and a nozzle 203d is set at the bottom of both the branch pipe 203c and the bottom of the water guide pipe 203b. This method requires multiple nozzles 203d to ensure that there are no spray dead corners. If there are few nozzles 203d and there are no spray dead corners, it is easy to cause the workpiece cleaning to be slow. Setting multiple nozzles 203d will increase the cost.

[0100] The second spraying method involves installing multiple inlet pipes 203e at the top of the water guide pipe 203b, with the number of inlet pipes 203e corresponding to the number of nozzles 203d. The inlet pipes 203e then pour water into the water wheel 203g through the inclined groove 203f. The water flow drives the water wheel 203g to rotate, effectively moving the actuating block 203h. The moving actuating block actuates the fixed rod 203h-5, which in turn actuates the fixed rod 203h-5. The movable rod 203h-7 is moved. Since the movable rod 203h-7 is located at the bottom of the nozzle 203d, it can splash water in all directions to clean the workpiece. When the actuating block 203h disengages from the fixed rod 203h-5, the elastic force of the telescopic spring 203h-8 can effectively drive the movable rod 203h-7 to rebound, stirring the water back and forth to generate water splashes, thereby effectively cleaning the workpiece. Moreover, multiple nozzles are not required, reducing production costs.

[0101] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application). For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0102] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the best mode of carrying out the invention as currently considered, or those features that are not relevant to implementing the invention) may be omitted.

[0103] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0104] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A decontamination agent for components of a pressurized water reactor nuclear power plant, characterized in that: Composed of the following ingredients in parts by weight Composition: 3-8 parts citric acid, 1-3 parts glycolic acid, 0.2-4 parts ethanolamine, 0.1-1 parts polyacrylic acid, 0.5-2 parts diethylenetriaminepentaacetic acid and 82.0-95.2 parts water. Finally, add the above components into the mixing tank and mix evenly.

2. A method for preparing a decontamination agent for a pressurized water reactor nuclear power plant component, characterized in that: The decontamination agent for pressurized water reactor nuclear power plant components as described in claim 1 further includes: Diethylenetriaminepentaacetic acid was added to ultrapure water, followed by the addition of ethanolamine at a 1:1 mass ratio. The mixture was then poured into a mixing tank and stirred for 2–5 minutes with a rotating stirring rod to completely dissolve the diethylenetriaminepentaacetic acid. The aqueous solution obtained in the previous step is then added to the mixing tank again, and the stirring rod is rotated and stirred for 1 to 2 minutes to completely dissolve the polyacrylic acid. The aqueous solution obtained in the previous mixing tank is then added to the aqueous solution again. After slowly rotating the stirring rod, the citric acid and glycolic acid are completely dissolved. Ethanolamine, citric acid, and glycolic acid were added to the solution obtained in the previous stirring tank to adjust the pH value of the solution. After adjusting the pH value to 1.5-2.5, an offline chemical decontaminant for primary loop equipment components of pressurized water reactor nuclear power plants was obtained.

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