System, method and device for treating organic matter in boron-containing water of nuclear power plant

Abstract

The present invention belongs to the field of nuclear power plant water treatment, specifically relating to a system, method, and apparatus for treating organic matter in boron-containing water in a nuclear power plant. The system comprises: the output end of a first boron-containing water pool is connected to the input end of a spent fuel water pool; the spent fuel pool stores used spent fuel, and the coolant in the spent fuel water generates oxidizing properties upon contact with air. The irradiation and oxidizing properties of the spent fuel are used to decompose organic matter in the input liquid. Without increasing system equipment or modification costs, the system creatively employs a process of oxidation and irradiation outside the primary loop to decompose organic matter, and a combined purification bed to purify the decomposition products. This allows for the safe, efficient, and rapid removal of organic matter and its decomposition products from the primary boron-containing system, ensuring safe and stable operation of the unit.

Description

Technical Field

[0001] The present application belongs to the field of water treatment in nuclear power plants, and specifically relates to a system, method, and device for treating organic matter in boron-containing water in nuclear power plants. Background Art

[0002] The boron-containing water in the primary circuit system of a nuclear power plant contains some unavoidable organic matter, such as resin degradation products, sealing strip leachate, and residual grease from maintenance. Once these enter the main circuit, the organic acids produced by their decomposition may corrode important components such as heat transfer pipes and fuel cladding. High-temperature decomposition of organic matter containing halogens and sulfur produces highly corrosive impurity ions such as chloride ions and sulfate ions, which may create stress corrosion risks. This can lead to deviations in main circuit control and diagnostic indicators, affecting the safe and stable operation of the nuclear power plant. Therefore, targeted measures are needed to address these issues, or changes are needed in the process to reduce the risks and keep them within a safe and reasonable range. Summary of the Invention

[0003] The purpose of this application is to provide a system, method and device for treating organic matter in boron-containing water in nuclear power plants, so as to solve the problem that some inevitably generated organic matter in the boron-containing water in the primary circuit system of nuclear power plants affects the safe and stable operation of nuclear power plants.

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

[0005] In a first aspect, the present application provides a system for treating organic matter in boron-containing water in a nuclear power plant, comprising: a spent fuel pool and a first boron-containing water pool;

[0006] The output end of the first boron-containing water pool is connected to the input end of the spent fuel water pool;

[0007] The spent fuel pool stores used spent fuel. The coolant in the spent fuel water produces oxidizing properties when it comes into contact with air. The irradiation and oxidizing properties of the spent fuel are used to decompose organic matter in the input liquid.

[0008] Optionally, the system further comprises: a booster pump and a purification bed;

[0009] The output end of the spent fuel pool is connected to the input end of the purification bed via a booster pump;

[0010] The output end of the purification bed is connected to the input end of the spent fuel pool;

[0011] Purification bed, used to purify impurity ions.

[0012] Optionally, the system further includes: a plurality of valves;

[0013] Multiple valves are used to control the output of liquid from the first boron-containing water pool, and to control the flow of liquid into and out of the spent fuel pool, the booster pump and the purification bed.

[0014] Optionally, the system further comprises: a second boron-containing water pool;

[0015] The output end of the second boron-containing water pool is connected to the input end of the spent fuel pool, and the input end of the second boron-containing water pool is connected to the output end of the purification bed.

[0016] Optionally, the system further includes: a valve for controlling the flow of liquid into and out of the second boron-containing water pool.

[0017] A second aspect of the present application provides a method for treating organic matter in boron-containing water in a nuclear power plant, which is applied to the system for treating organic matter in boron-containing water in a nuclear power plant provided in the first aspect of the present application; the method comprises:

[0018] analyzing a first boron-containing water pool for a first concentration of organic matter;

[0019] Determining a first time required to decompose organic matter in the first boron-containing water pool according to the first concentration;

[0020] According to the first time consumption, the liquid in the first boron-containing water pool is controlled to be output to the spent fuel pool.

[0021] Optionally, determining a first time required to decompose the organic matter in the first boron-containing water pool according to the first concentration specifically includes:

[0022] The first time consumption is determined according to the first concentration and the exponential decay law.

[0023] Optionally, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump and a purification bed, the liquid in the first boron-containing water pool is controlled to be output to the spent fuel pool according to the first time consumption, and then the method further includes:

[0024] analyzing the organic matter in the first boron-containing water pool and the concentration of the first impurity ion produced after digestion;

[0025] When the first impurity ion concentration is less than a first preset threshold, disconnecting the flow of liquid from the first boron-containing water pool to the spent fuel pool;

[0026] When the first impurity ion concentration is greater than or equal to a first preset threshold, the spent fuel pool is controlled to output liquid to the purification bed via the booster pump, so that the purification bed purifies the impurity ions.

[0027] Optionally, the system controls the output of liquid from the spent fuel pool to the purification bed via a booster pump, and further includes:

[0028] When the first impurity ion concentration is less than a first preset threshold, the flow of liquid from the first boron-containing water pool to the spent fuel pool and the flow of liquid from the spent fuel pool to the purification bed via the booster pump are cut off.

[0029] Optionally, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump, a purification bed, and a second boron-containing water pool; the method further includes:

[0030] analyzing a second boron-containing water pool for a second concentration of organic matter;

[0031] determining a second time required to digest the organic matter in the second boron-containing water pool according to the second concentration;

[0032] According to the second time consumption, the circulation flow of liquid among the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed is controlled.

[0033] Optionally, determining a second time required to digest the organic matter in the second boron-containing water pool based on the second concentration specifically includes:

[0034] The second time consumption is determined according to the second concentration and the exponential decay law.

[0035] Optionally, controlling the circulation of liquid among the liquid in the second boron-containing water pool, the spent fuel pool, the booster pump, and the purification bed, and then further comprising:

[0036] Analyzing the concentration of organic matter in the second boron-containing water pool and the second impurity ion generated after digestion;

[0037] When the second impurity ion concentration is less than a second preset threshold, the liquid circulation flow among the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed is disconnected.

[0038] A third aspect of the present application provides a device for treating organic matter in boron-containing water in a nuclear power plant, which is applied to the system for treating organic matter in boron-containing water in a nuclear power plant provided in the first aspect of the present application; the device comprises:

[0039] a first analysis module, configured to analyze a first concentration of organic matter in the first boron-containing water pool;

[0040] A first determining module is configured to determine a first time required to decompose the organic matter in the first boron-containing water pool according to the first concentration;

[0041] A first control module is configured to control the liquid in the first boron-containing water pool to be output to the spent fuel water pool according to the first time consumption.

[0042] Optionally, the first determination module is specifically configured to determine the first time consumption according to the first concentration and an exponential decay law.

[0043] Optionally, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump and a purification bed, the device further includes:

[0044] a second analysis module, configured to analyze the concentration of organic matter in the first boron-containing water pool and the first impurity ion produced after digestion;

[0045] a second control module, configured to cut off the flow of liquid from the first boron-containing water pool to the spent fuel water pool when the first impurity ion concentration is less than a first preset threshold;

[0046] a third control module, configured to control the spent fuel pool to output liquid to the purification bed via the booster pump when the first impurity ion concentration is greater than or equal to the first preset threshold, so that the purification bed purifies the impurity ions.

[0047] Optionally, the device further includes:

[0048] a fourth control module, configured to cut off the flow of liquid from the first boron-containing water pool to the spent fuel pool and the flow of liquid from the spent fuel pool to the purification bed via the booster pump when the first impurity ion concentration is less than the first preset threshold.

[0049] Optionally, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump, a purification bed, and a second boron-containing water pool; the device further includes:

[0050] a third analysis module, configured to analyze a second concentration of organic matter in the second boron-containing water pool;

[0051] a second determining module, configured to determine a second time required to decompose the organic matter in the second boron-containing water pool according to the second concentration;

[0052] and a fifth control module, configured to control the circulation of liquid among the second boron-containing water pool, the spent fuel water pool, the booster pump, and the purification bed according to the second time consumption.

[0053] Optionally, the second determining module is specifically configured to:

[0054] The second time consumption is determined according to the second concentration and an exponential decay law.

[0055] Optionally, the device further includes:

[0056] a fourth analysis module, configured to analyze the concentration of organic matter in the second boron-containing water pool and second impurity ions generated after digestion;

[0057] and a sixth control module, configured to disconnect the liquid circulation between the second boron-containing water pool, the spent fuel water pool, the booster pump, and the purification bed when the second impurity ion concentration is less than a second preset threshold.

[0058] In a fourth aspect, the present application provides a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the processor executes the method for treating organic matter in boron-containing water in a nuclear power plant provided in the second aspect of the present application.

[0059] The beneficial technical effects of this application are:

[0060] (1) This application conducts an in-depth analysis of the sources of organic matter in the water quality of nuclear power plants, fully studies the properties and characteristics of organic matter, comprehensively compares various conventional methods for treating organic matter, and combines the design characteristics of the primary circuit system of nuclear power plants. Without increasing system equipment and modification costs, it creatively adopts a process method of oxidation and irradiation decomposition of organic matter outside the main circuit and purification of decomposition products by a combined purification bed, so as to safely, efficiently and quickly remove organic matter and its decomposition products in the boron-containing system of the primary circuit, thereby ensuring the safe and stable operation of the unit.

[0061] (2) Through the above-mentioned operation mode, the content of organic matter in boron-containing water and the content of inorganic anions produced after its decomposition can be effectively controlled and reduced. Moreover, the primary boron-containing system can be transferred through a medium or poured into the spent fuel water for oxidation and irradiation decomposition, which solves the problem that the organic matter is high after boric acid contamination and cannot be removed by the purification bed. Ultimately, the purpose of safely, efficiently and quickly removing the organic matter and its decomposition products in the primary boron-containing system is achieved, especially in the face of high-concentration oil, a large amount of resin degradation product pollution events and the like.

[0062] (3) The embodiments of the present application fundamentally solve the technical difficulties in treating organic matter in boron-containing water in the primary circuit of a nuclear power plant, avoid the waste of resin purification beds, reduce the generation of radioactive boric acid waste liquid, and ensure the safe and stable operation of the nuclear power unit. The embodiments of the present application do not require changes to the system design, the addition of additional system facilities, or the addition of additional chemical reagents, and pose no risk to the unit's safety.

[0063] (4) The oxidative irradiation method employed in the embodiments of the present application is universally applicable to all primary circuit systems. It can directly resolve the degradation challenges of organic matter such as rubber strips, resin degradation products, and grease in boron-containing water systems such as spent fuel pools, in-core component inspection wells, and primary circuit boron storage tanks through oxidative irradiation decomposition, while simultaneously utilizing the spent fuel water purification system to purify impurity ions. This is the first time in China and abroad that the oxidative and irradiative properties of spent fuel pools have been utilized to degrade organic matter. This allows for the broad and effective removal of various types of organic matter from various boron-containing water systems in the primary circuit without increasing operating costs or risks.

[0064] (5) A method for calculating the oxidation and irradiation decomposition rates of organic matter was explored to effectively evaluate the decomposition time and provide theoretical guidance for practical work.

[0065] (6) Using oxidative irradiation and a variety of purification cycle methods, while reducing the organic matter content in the primary circuit system, it also removes harmful impurity ions produced by the degradation of organic matter. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 A schematic structural diagram of a system for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application;

[0067] Figure 2 A schematic structural diagram of another system for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application;

[0068] Figure 3 A schematic flow chart of a method for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application;

[0069] Figure 4 A schematic flow chart of another method for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application;

[0070] Figure 5 A schematic flow chart of another method for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application;

[0071] Figure 6 A schematic structural diagram of a device for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application. DETAILED DESCRIPTION

[0072] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only part of the embodiments of the present application, not all of them. Based on the embodiments recorded in this application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of this application.

[0073] After investigating and studying the sources of organic matter in boron-containing water in nuclear power plants, the inventors of this application found that the organic matter mainly comes from the boric acid dissolution of rubber strips and gaskets, the aging and oxidation of purification system resins, and the grease produced during maintenance. The sources of organic matter are relatively complex, and the properties of the source substances vary. After degradation, these substances may produce high concentrations of chloride ions, sulfate radicals, and organic oleic acid, etc. If they enter the main loop coolant system directly, they will have a serious impact on the safe operation of the system. In response to the above situation, firstly, it is necessary to take broad-spectrum and effective measures to degrade these organic substances before they enter the main loop coolant system, and secondly, it is necessary to remove the harmful impurity ions produced by the degradation of these organic substances.

[0074] However, the inventors of the present application found in their research that, currently, the treatment of organic matter in water is generally carried out through a single technology or a combination of multiple technologies such as activated carbon adsorption, ultrafiltration reverse osmosis process, oxidant oxidation, and medium-pressure ultraviolet decomposition. These methods either require the addition of additional equipment or have the risk of introducing new impurity ions after treatment, and are not suitable for direct application in the treatment of organic matter in boron-containing water in nuclear power plants.

[0075] To this end, the inventors of this application discovered that the oxidative irradiation method is universally applicable across all primary circuit systems, directly addressing the degradation challenges of organic matter such as rubber strips, resin degradation products, and grease in boron-containing water systems such as spent fuel pools, in-core component inspection wells, and primary circuit boron storage tanks. Furthermore, given that spent fuel pools contain spent fuel, its high radioactivity can provide irradiation energy, and the coolant in the spent fuel water is in direct contact with air, continuously producing highly oxidizing hydrogen peroxide (H2O2) and hydroxyl radicals (OH). Under these strong oxidative and irradiation conditions, various organic substances undergo continuous and rapid decomposition to form products such as inorganic ions and inorganic carbohydrates.

[0076] Because oxidation and irradiation methods can be used as a broad-spectrum and effective solution to the problem of through-degradation of organic matter such as rubber strips and gaskets, resin degradation products, and grease, the technical solution provided in the embodiments of the present application is formulated: using the boron-containing water in each water tank (pool) to establish a dynamic or static water quality circulation with the spent fuel pool, utilizing the strong oxidation and strong irradiation conditions in the spent fuel pool to decompose the organic matter in the boron-containing water; at the same time, the impurity ions generated by the decomposition are removed through the purification system of the purification bed.

[0077] Through the above-mentioned operating mode, the content of organic matter in boron-containing water and the content of inorganic anions produced after its decomposition can be effectively controlled and reduced. In addition, the primary boron-containing system can be transferred through a medium or poured into the spent fuel water for oxidative irradiation decomposition, solving the problem of high organic matter content after boric acid contamination and the inability to remove it through the purification bed. Ultimately, the goal of safely, efficiently and quickly removing organic matter and its decomposition products in the primary boron-containing system is achieved, especially in the face of high-concentration oil and large-scale resin degradation product contamination incidents.

[0078] The embodiments of the present application conduct an in-depth analysis of the sources of organic matter in the water quality of nuclear power plants, fully study the properties and characteristics of organic matter, comprehensively compare various conventional organic matter treatment methods, and combine the design characteristics of the primary circuit system of nuclear power plants. Without increasing system equipment and modification costs, the invention creatively adopts a process method of oxidation and irradiation decomposition of organic matter outside the main circuit and purification of decomposition products by a combined purification bed, thereby safely, efficiently and quickly removing organic matter and its decomposition products from the primary circuit boron-containing system, thereby ensuring safe and stable operation of the unit.

[0079] Based on the above content, in order to clearly and in detail illustrate the above advantages of the embodiments of the present application, the specific implementation methods of the present application will be described below with reference to the accompanying drawings.

[0080] See also Figure 1 , which is a structural schematic diagram of a system for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application.

[0081] The embodiment of the present application provides a system for treating organic matter in boron-containing water in a nuclear power plant, comprising: a spent fuel pool 10 and a first boron-containing water pool 20;

[0082] The output end of the first boron-containing water pool 20 is connected to the input end of the spent fuel water pool 10;

[0083] The spent fuel pool 10 stores used spent fuel. The coolant in the spent fuel water generates oxidizing properties when in contact with air. The irradiation and oxidizing properties of the spent fuel are used to decompose organic matter in the input liquid.

[0084] It should be noted that the spent fuel pool 10 of a nuclear power plant stores used fuel, which has high radioactivity and can provide irradiation energy. Furthermore, the coolant in the spent fuel water is in direct contact with air, continuously producing H₂O₂ and ·OH, both of which are highly oxidizing. Hydrogen peroxide experiments have shown that the oxidizing property of the spent fuel pool 10, measured as H₂O₂ concentration, is 2-10 mg / L. Under these strong oxidizing and irradiation conditions, various organic compounds continuously and rapidly decompose to form products such as inorganic ions and inorganic carbohydrates. Therefore, the spent fuel pool 10 can be directly used to decompose the organic compounds in the liquid input to the first boron-containing water pool 20, eliminating the need for additional equipment and reducing modification costs.

[0085] In some possible implementations of the embodiments of the present application, in order to reduce impurity ions generated after decomposition of organic matter, the system may further include: a booster pump 30 and a purification bed 40;

[0086] The output end of the spent fuel pool 10 is connected to the input end of the purification bed 40 via a booster pump 30;

[0087] The output end of the purification bed 40 is connected to the input end of the spent fuel pool 10;

[0088] The purification bed 40 is used to purify impurity ions.

[0089] The embodiment of the present application can reduce the organic matter content in the primary loop system while also removing harmful impurity ions generated by the degradation of the organic matter.

[0090] In some possible implementations of the embodiments of the present application, the system may further include: a plurality of valves;

[0091] A plurality of valves are used to control the output of liquid from the first boron-containing water pool 20 , and to control the flow of liquid into and out of the spent fuel pool 10 , the booster pump 20 and the purification bed 30 .

[0092] It is understandable that the valve can be used to control the flow of liquid, thereby controlling the purification progress of organic matter and degrading the organic matter in the first boron-containing water pool as needed.

[0093] In some possible implementations of the present application, such as Figure 2 As shown, the system may further include: a second boron-containing water tank 50;

[0094] The output end of the second boron-containing water pool 50 is connected to the input end of the spent fuel water pool 10 , and the input end of the second boron-containing water pool 50 is connected to the output end of the purification bed 40 .

[0095] The system provided in the embodiment of the present application can digest organic matter in multiple boron-containing water pools. The specific digestion principles are similar and will not be repeated here.

[0096] In some possible implementations of the embodiments of the present application, the system may further include: a valve for controlling the flow of liquid into and out of the second boron-containing water pool.

[0097] This application conducts an in-depth analysis of the sources of organic matter in the water quality of nuclear power plants, fully studies the properties and characteristics of organic matter, comprehensively compares various conventional organic matter treatment methods, and combines the design characteristics of the primary circuit system of nuclear power plants. Without increasing system equipment and modification costs, it creatively adopts a process method of oxidation and irradiation decomposition of organic matter outside the main circuit and purification of decomposition products by a combined purification bed, so as to safely, efficiently and quickly remove organic matter and its decomposition products in the primary circuit boron-containing system, thereby ensuring safe and stable operation of the unit.

[0098] Based on the system for treating organic matter in boron-containing water in nuclear power plants provided in the above embodiments, an embodiment of the present application also provides a method for treating organic matter in boron-containing water in nuclear power plants, which is applied to any of the systems for treating organic matter in boron-containing water in nuclear power plants provided in the above embodiments.

[0099] See also Figure 3 , which is a flow chart of a method for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application.

[0100] The method for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application comprises:

[0101] S301: Analyze a first concentration of organic matter in a first boron-containing water pool.

[0102] S302: Determine a first time required to decompose organic matter in the first boron-containing water pool according to the first concentration.

[0103] In some possible implementations of the embodiment of the present application, step S302 may specifically include:

[0104] The first time consumption is determined according to the first concentration and the exponential decay law.

[0105] It should be noted that the exponential decay law can be specifically expressed as follows:

[0106] dc=λCdt (1)

[0107] C=C0e -λt (2)

[0108] Where dc is the change in total organic carbon (TOC) concentration per unit time, λ is the radiation decomposition rate, C is the organic matter concentration, dt is the unit time, and C0 is the initial organic matter concentration.

[0109] S303: According to the first time consumption, control the liquid in the first boron-containing water pool to be output to the spent fuel pool.

[0110] This application conducts an in-depth analysis of the sources of organic matter in the water quality of nuclear power plants, fully studies the properties and characteristics of organic matter, comprehensively compares various conventional organic matter treatment methods, and combines the design characteristics of the primary circuit system of nuclear power plants. Without increasing system equipment and modification costs, it creatively adopts a process method of oxidation and irradiation decomposition of organic matter outside the main circuit to safely, efficiently and quickly remove organic matter and its decomposition products in the primary circuit boron-containing system, thereby ensuring safe and stable operation of the unit.

[0111] In some possible implementations of the present application, such as Figure 4 As shown, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump and a purification bed, step S303 may further include:

[0112] S304: analyzing the concentration of organic matter in the first boron-containing water pool and the first impurity ion generated after digestion;

[0113] S305: When the first impurity ion concentration is less than a first preset threshold, shutting off the flow of liquid from the first boron-containing water pool to the spent fuel pool;

[0114] S306: When the first impurity ion concentration is greater than or equal to a first preset threshold, controlling the spent fuel pool to output liquid to the purification bed via the booster pump, so that the purification bed purifies the impurity ions.

[0115] The embodiment of the present application can reduce the organic matter content in the primary loop system while utilizing the purification bed to remove harmful impurity ions generated by the degradation of the organic matter.

[0116] In one example, step S306 may further include:

[0117] When the first impurity ion concentration is less than a first preset threshold, the flow of liquid from the first boron-containing water pool to the spent fuel pool and the flow of liquid from the spent fuel pool to the purification bed via the booster pump are cut off.

[0118] In some possible implementations of the present application, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump, a purification bed, and a second boron-containing water pool, as shown in FIG. Figure 5 As shown, the method may further include:

[0119] S501: Analyze a second concentration of organic matter in a second boron-containing water pool.

[0120] S502: Determine a second time required to decompose the organic matter in the second boron-containing water pool according to the second concentration.

[0121] S503: According to the second time consumption, controlling the circulation of liquid among the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed.

[0122] It can be understood that the spent fuel pool is connected in series with the purification bed through a booster pump. The purified water enters the second boron-containing water pool for mixing and then returns to the spent fuel pool to digest organic matter. The specific digestion principle has been explained in the above content and will not be repeated here.

[0123] In some possible implementations of the embodiments of the present application, S502 may specifically include:

[0124] The second time consumption is determined according to the second concentration and the exponential decay law.

[0125] It is understandable that the exponential decay law can be specifically expressed as above formula (1) and formula (2), which will not be described in detail here.

[0126] In some possible implementations of the embodiment of the present application, S503 may further include:

[0127] Analyzing the concentration of organic matter in the second boron-containing water pool and the second impurity ion generated after digestion;

[0128] When the second impurity ion concentration is less than a second preset threshold, the liquid circulation flow among the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed is disconnected.

[0129] Through the above-mentioned operating mode, the content of organic matter in boron-containing water and the content of inorganic anions produced after its decomposition can be effectively controlled and reduced. In addition, the primary boron-containing system can be transferred through a medium or poured into the spent fuel water for oxidative irradiation decomposition, solving the problem of high organic matter content after boric acid contamination and the inability to remove it through the purification bed. Ultimately, the goal of safely, efficiently and quickly removing organic matter and its decomposition products in the primary boron-containing system is achieved, especially in the face of high-concentration oil and large-scale resin degradation product contamination incidents.

[0130] Based on the method for treating organic matter in boron-containing water in nuclear power plants provided in the above embodiments, the embodiments of the present application also provide a device for treating organic matter in boron-containing water in nuclear power plants, which is applied to any of the systems for treating organic matter in boron-containing water in nuclear power plants provided in the above embodiments.

[0131] See also Figure 6 , which is a structural schematic diagram of a device for treating organic matter in boron-containing water in a nuclear power plant provided in an embodiment of the present application.

[0132] An embodiment of the present application provides a device for treating organic matter in boron-containing water in a nuclear power plant, comprising:

[0133] A first analysis module 601 is used to analyze a first concentration of organic matter in a first boron-containing water pool;

[0134] A first calculation module 602 is used to determine a first time required to decompose organic matter in the first boron-containing water pool according to the first concentration;

[0135] The first control module 603 is configured to control the liquid in the first boron-containing water pool to be output to the spent fuel water pool according to the first time consumption.

[0136] In some possible implementations of the embodiments of the present application, the first determination module may be specifically configured to determine the first time consumption based on the first concentration and an exponential decay law.

[0137] In some possible implementations of the embodiments of the present application, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump and a purification bed, the device may further include:

[0138] a second analysis module, configured to analyze the concentration of organic matter in the first boron-containing water pool and the first impurity ion produced after digestion;

[0139] a second control module, configured to cut off the flow of liquid from the first boron-containing water pool to the spent fuel water pool when the first impurity ion concentration is less than a first preset threshold;

[0140] a third control module, configured to control the spent fuel pool to output liquid to the purification bed via the booster pump when the first impurity ion concentration is greater than or equal to the first preset threshold, so that the purification bed purifies the impurity ions.

[0141] In some possible implementations of the embodiments of the present application, the apparatus may further include:

[0142] a fourth control module, configured to cut off the flow of liquid from the first boron-containing water pool to the spent fuel pool and the flow of liquid from the spent fuel pool to the purification bed via the booster pump when the first impurity ion concentration is less than the first preset threshold.

[0143] In some possible implementations of the embodiments of the present application, when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump, a purification bed, and a second boron-containing water pool; the device may further include:

[0144] a third analysis module, configured to analyze a second concentration of organic matter in the second boron-containing water pool;

[0145] a second determining module, configured to determine a second time required to decompose the organic matter in the second boron-containing water pool according to the second concentration;

[0146] and a fifth control module, configured to control the circulation of liquid among the second boron-containing water pool, the spent fuel water pool, the booster pump, and the purification bed according to the second time consumption.

[0147] In some possible implementations of the embodiments of the present application, the second determining module may be specifically configured to:

[0148] The second time consumption is determined according to the second concentration and an exponential decay law.

[0149] In some possible implementations of the embodiments of the present application, the apparatus may further include:

[0150] a fourth analysis module, configured to analyze the concentration of organic matter in the second boron-containing water pool and second impurity ions generated after digestion;

[0151] and a sixth control module, configured to disconnect the liquid circulation between the second boron-containing water pool, the spent fuel water pool, the booster pump, and the purification bed when the second impurity ion concentration is less than a second preset threshold.

[0152] Based on the system and method for treating organic matter in boron-containing water in nuclear power plants provided in the above embodiments, the embodiments of the present application also provide a computer-readable storage medium, in which a computer program is stored. When the computer program is executed by a processor, the processor executes any one of the methods for treating organic matter in boron-containing water in nuclear power plants provided in the embodiments of the present application.

[0153] Through the above-mentioned operating mode, the content of organic matter in boron-containing water and the content of inorganic anions produced after its decomposition can be effectively controlled and reduced. In addition, the primary boron-containing system can be transferred through a medium or poured into the spent fuel water for oxidative irradiation decomposition, solving the problem of high organic matter content after boric acid contamination and the inability to remove it through the purification bed. Ultimately, the goal of safely, efficiently and quickly removing organic matter and its decomposition products in the primary boron-containing system is achieved, especially in the face of high-concentration oil and large-scale resin degradation product contamination incidents.

[0154] The oxidative irradiation method employed in the embodiments of this application is universally applicable to all primary circuit systems. It can directly address the degradation challenges of organic matter such as rubber strips, resin degradation products, and grease in boron-containing water systems such as spent fuel pools, in-core inspection wells, and primary circuit boron storage tanks through oxidative irradiation, while simultaneously utilizing the spent fuel water purification system to purify impurity ions. Taking the treatment of rubber strips in the spent fuel pool as an example, the method provided in the embodiments of this application rapidly reduced the organic matter generated by the rubber strips and gaskets in the spent fuel pool from a level of 2 mg / L to a detection limit of less than 20 μg / L in a short period of time, achieving essentially 100% decomposition. Simultaneously, a significant amount of derivative chloride ions and a certain amount of sulfate ions were generated, which were quickly reduced to local levels by operating a purification bed. Similar results were observed in the in-core inspection wells and primary circuit boron storage systems. After being connected to the spent fuel pool and operated simultaneously with the purification bed, organic matter was rapidly reduced and anions were also controlled to low levels, ensuring the safe and stable operation of the primary circuit system.

[0155] The embodiments of the present application fundamentally solve the technical difficulties in treating organic matter in boron-containing water in the primary circuit of a nuclear power plant, avoid the waste of resin purification beds, reduce the generation of radioactive boric acid waste liquid, and also ensure the safe and stable operation of the nuclear power unit. The embodiments of the present application do not require changes to the system design, do not require the addition of additional system facilities, do not require the addition of additional chemical reagents, and are risk-free to the safety of the unit. Taking a certain nuclear power unit as an example, without considering the cost of resin waste caused by organic contamination in traditional resin purification, only considering the recovery of boric acid after removing high-concentration organic matter, each unit saves an average of 40 tons of boric acid each year, reducing procurement costs by 600,000 yuan, and also saving economic costs such as waste liquid distillation, radioactive solid waste treatment, and desalted water production, and also has good social and environmental benefits.

[0156] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the purpose of the present application. Any content not described in detail in the present application may be based on existing technologies.

Claims

1. A method for treating organic matter in boron-containing water in a nuclear power plant, characterized in that: The invention relates to a system for treating organic matter in boron-containing water in a nuclear power plant. The system comprises a spent fuel pool and a first boron-containing water pool. The output end of the first boron-containing water pool is connected to the input end of the spent fuel pool. The spent fuel pool stores used spent fuel. The coolant in the spent fuel water generates oxidizing properties when in contact with air. The irradiation and oxidizing properties of the spent fuel are used to decompose organic matter in the input liquid. The method comprises: analyzing a first concentration of organic matter in the first boron-containing water pool; determining a first time required to decompose the organic matter in the first boron-containing water pool according to the first concentration; According to the first time consumption, the liquid in the first boron-containing water pool is controlled to be output to the spent fuel water pool.

2. The method for treating organic matter in boron-containing water in a nuclear power plant according to claim 1, characterized in that: Determining a first time required to decompose the organic matter in the first boron-containing water pool according to the first concentration specifically includes: The first time consumption is determined according to the first concentration and an exponential decay law.

3. The method for treating organic matter in boron-containing water in a nuclear power plant according to claim 1 or 2, characterized in that: The system further includes: a booster pump and a purification bed; the output end of the spent fuel pool is connected to the input end of the purification bed via the booster pump; the output end of the purification bed is connected to the input end of the spent fuel pool; the purification bed is used to purify impurity ions; when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump and a purification bed, the liquid in the first boron-containing water pool is controlled to be output to the spent fuel pool according to the first time consumption, and then the following is further included: analyzing the concentration of organic matter and first impurity ions generated after digestion in the first boron-containing water pool; When the first impurity ion concentration is less than a first preset threshold, shutting off the flow of liquid from the first boron-containing water pool to the spent fuel water pool; When the first impurity ion concentration is greater than or equal to the first preset threshold, the spent fuel pool is controlled to output liquid to the purification bed via the booster pump, so that the purification bed purifies the impurity ions.

4. The method for treating organic matter in boron-containing water in a nuclear power plant according to claim 3, characterized in that: The step of controlling the spent fuel pool to output liquid to the purification bed via the booster pump further includes: When the first impurity ion concentration is less than the first preset threshold, the flow of liquid from the first boron-containing water pool to the spent fuel pool and the flow of liquid from the spent fuel pool to the purification bed through the booster pump are disconnected.

5. The method for treating organic matter in boron-containing water in a nuclear power plant according to claim 1, characterized in that: The system further includes: a booster pump and a purification bed; the output end of the spent fuel pool is connected to the input end of the purification bed via the booster pump; the output end of the purification bed is connected to the input end of the spent fuel pool; the purification bed is used to purify impurity ions; the system further includes: a second boron-containing water pool; the output end of the second boron-containing water pool is connected to the input end of the spent fuel pool, and the input end of the second boron-containing water pool is connected to the output end of the purification bed; when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump, a purification bed, and a second boron-containing water pool; the method further includes: analyzing a second concentration of organic matter in the second boron-containing water pool; determining a second time required to digest the organic matter in the second boron-containing water pool according to the second concentration; According to the second time consumption, the circulation of liquid among the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed is controlled.

6. The method for treating organic matter in boron-containing water in a nuclear power plant according to claim 5, characterized in that: Determining a second time required to digest the organic matter in the second boron-containing water pool according to the second concentration specifically includes: The second time consumption is determined according to the second concentration and an exponential decay law.

7. The method for treating organic matter in boron-containing water in a nuclear power plant according to claim 6, characterized in that: The controlling of the circulation of liquid among the liquid in the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed further includes: analyzing the concentration of organic matter and second impurity ions generated after digestion in the second boron-containing water pool; When the second impurity ion concentration is less than a second preset threshold, the liquid circulation flow among the second boron-containing water pool, the spent fuel water pool, the booster pump and the purification bed is disconnected.

8. A device for treating organic matter in boron-containing water in a nuclear power plant, characterized in that: The invention relates to a system for treating organic matter in boron-containing water in a nuclear power plant. The system comprises a spent fuel pool and a first boron-containing water pool. The output end of the first boron-containing water pool is connected to the input end of the spent fuel pool. The spent fuel pool stores used spent fuel. The coolant in the spent fuel water generates oxidizing properties when in contact with air. The irradiation and oxidizing properties of the spent fuel are used to decompose organic matter in the input liquid. The device comprises: a first analysis module, configured to analyze a first concentration of organic matter in the first boron-containing water pool; A first determining module is configured to determine a first time required to decompose the organic matter in the first boron-containing water pool according to the first concentration; A first control module is configured to control the liquid in the first boron-containing water pool to be output to the spent fuel water pool according to the first time consumption.

9. The device for treating organic matter in boron-containing water in a nuclear power plant according to claim 8, characterized in that: The first determining module is specifically configured to determine the first time consumption according to the first concentration and an exponential decay law.

10. The device for treating organic matter in boron-containing water in a nuclear power plant according to claim 8 or 9, characterized in that: The system further includes: a booster pump and a purification bed; the output end of the spent fuel pool is connected to the input end of the purification bed via the booster pump; the output end of the purification bed is connected to the input end of the spent fuel pool; the purification bed is used to purify impurity ions; when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump and a purification bed, the device further includes: a second analysis module, configured to analyze the concentration of organic matter in the first boron-containing water pool and the first impurity ion produced after digestion; a second control module, configured to cut off the flow of liquid from the first boron-containing water pool to the spent fuel water pool when the first impurity ion concentration is less than a first preset threshold; a third control module, configured to control the spent fuel pool to output liquid to the purification bed via the booster pump when the first impurity ion concentration is greater than or equal to the first preset threshold, so that the purification bed purifies the impurity ions.

11. The device for treating organic matter in boron-containing water in a nuclear power plant according to claim 10, characterized in that: The device further comprises: a fourth control module, configured to cut off the flow of liquid from the first boron-containing water pool to the spent fuel pool and the flow of liquid from the spent fuel pool to the purification bed via the booster pump when the first impurity ion concentration is less than the first preset threshold.

12. The device for treating organic matter in boron-containing water in a nuclear power plant according to claim 8, characterized in that: The system further includes: a booster pump and a purification bed; the output end of the spent fuel pool is connected to the input end of the purification bed via the booster pump; the output end of the purification bed is connected to the input end of the spent fuel pool; the purification bed is used to purify impurity ions; the system further includes: a second boron-containing water pool; the output end of the second boron-containing water pool is connected to the input end of the spent fuel pool, and the input end of the second boron-containing water pool is connected to the output end of the purification bed; when the system for treating organic matter in boron-containing water in a nuclear power plant includes a booster pump, a purification bed, and a second boron-containing water pool; the device further includes: a third analysis module, configured to analyze a second concentration of organic matter in the second boron-containing water pool; a second determining module, configured to determine a second time required to decompose the organic matter in the second boron-containing water pool according to the second concentration; and a fifth control module, configured to control the circulation of liquid among the second boron-containing water pool, the spent fuel water pool, the booster pump, and the purification bed according to the second time consumption.

13. The device for treating organic matter in boron-containing water in a nuclear power plant according to claim 12, characterized in that: The second determining module is specifically configured to: The second time consumption is determined according to the second concentration and an exponential decay law.

14. The device for treating organic matter in boron-containing water in a nuclear power plant according to claim 13, characterized in that: The device further comprises: a fourth analysis module, configured to analyze the concentration of organic matter in the second boron-containing water pool and second impurity ions generated after digestion; and a sixth control module, configured to disconnect the liquid circulation between the second boron-containing water pool, the spent fuel water pool, the booster pump, and the purification bed when the second impurity ion concentration is less than a second preset threshold.

15. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the processor executes the method for treating organic matter in boron-containing water in a nuclear power plant according to any one of claims 1 to 7.

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