Deuterium removal and volume reduction method and system for tritium production plant

Abstract

The present application relates to the field of tritium removal and radioactive waste liquid volume reduction of tritium-related plant accident exhaust, and discloses a tritium removal and volume reduction method and system for tritium-related plant, wherein the tritium removal and volume reduction method for tritium-related plant comprises the following steps: determining that the tritium concentration of the tritium-related plant reaches a set value, and then pumping the tritium-related plant; performing primary condensation and gas-liquid separation on the pumped air to obtain primary condensate and primary treatment gas, and separately collecting and storing the primary condensate; catalytically oxidizing the primary treatment gas; performing secondary condensation and gas-liquid separation on the primary treatment gas after catalytic oxidation to obtain secondary condensate and secondary treatment gas, and separately collecting and storing the secondary condensate. The tritium removal and volume reduction method for tritium-related plant can realize the classified management of low-activity large water volume and high-activity small water volume, reduce the capacity of low-level tritium-containing wastewater after an accident from the source, and reduce the whole-chain pressure of temporary storage, sampling detection, batch tracing, transportation and concentration, solidification and disposal of the wastewater after the accident.

Description

Technical Field

[0001] This invention relates to the field of tritium removal and volume reduction technology for tritium-containing facilities in fusion reactors, and particularly to a method and system for tritium removal and volume reduction in tritium-containing facilities. Background Technology

[0002] Currently, tritium is the core fuel in the deuterium-tritium fuel cycle of fusion reactors and a key nuclide for achieving self-sustaining fusion reactions. However, tritium is radioactive, and both gaseous tritium and tritium-containing water can migrate through air diffusion, material surface adsorption, condensate transport, and human ingestion. Therefore, the release, migration, collection, and waste forms of tritium must be strictly controlled within fusion reactor buildings, tritium process compartments, tritium laboratories, and tritium-related maintenance spaces.

[0003] During the fusion reactor fuel cycle, tritium storage and transfer, vacuum system evacuation, and equipment maintenance, leaks may occur in valves, pipelines, pump sets, joints, glove box interfaces, and local enclosure structures under abnormal or accidental conditions. This can release HT (hydrogen tritide), T2 (tritium gas), HTO (water tritide), T2O (tritium monoxide), and tritium-containing organic matter into the plant air. To prevent tritium-containing air from spreading into the environment, the tritium-containing plant is normally maintained at negative pressure through continuous evacuation. In accidental conditions, the evacuation rate is further increased, and the plant air is centrally sent to the tritium removal system for treatment.

[0004] However, existing accident tritium removal processes generally employ a "catalytic oxidation + capture" approach: first, tritium-containing air containing HT, T2, and tritium-containing organic matter is catalytically oxidized to HTO and T2O, and then tritium-containing water is captured through condensation, low-temperature adsorption, or molecular sieve adsorption. This strategy can effectively capture tritium, but when the accident exhaust carries a large amount of ordinary water vapor, the ordinary water will mix with the tritium-containing water generated by oxidation and enter the condensate or adsorption bed regeneration liquid. The ordinary water, which could originally be managed in stages, is diluted and mixed into low-level tritium-containing water, significantly increasing the pressure on the entire chain of wastewater storage, sampling and testing, batch traceability, transfer and concentration, and solidification disposal after the accident.

[0005] Taking a 100m³ tritium-contaminated plant as an example: under conditions of 20℃-24℃ and relative humidity of 40%-60%, the original water vapor in the enclosed space will only produce 0.7kg-1.3kg of water upon complete condensation. However, during the accident response phase, in order to maintain negative pressure, the plant will continuously pump air in, inevitably causing external air to seep in. If the external environment is 30℃, relative humidity 60%, and absolute humidity approximately 18g / m³, and the accident pumping rate is 1000m³ / h with air replenishment mainly from external air leakage, then the water load entering the tritium removal system can reach approximately 18kg / h. If the post-accident treatment continues for 10 hours, approximately 180kg of water will enter the oxidation-condensation or low-temperature adsorption regeneration process, and will all be included in the low-level tritium-containing wastewater management scope, greatly increasing the pressure on the entire chain after the accident.

[0006] Therefore, how to reduce the total amount of low-level tritium-containing wastewater after an accident and reduce the post-treatment pressure without sacrificing negative pressure containment capacity and tritium removal efficiency has become a key technical problem that urgently needs to be solved. Summary of the Invention

[0007] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of this invention is to propose a method for detritonation and volume reduction in tritium-containing wastewater treatment plants. This method can achieve classified management of large volumes of low-activity wastewater and small volumes of high-activity wastewater, thereby reducing the volume of low-level tritium-containing wastewater after an accident from the source and reducing the pressure on the entire chain of wastewater storage, sampling and testing, batch traceability, transfer concentration, and solidification disposal after an accident.

[0008] The present invention also aims to provide a tritium removal and volume reduction system for tritium-contaminated plants, so as to apply the above-mentioned tritium removal and volume reduction method for tritium-contaminated plants.

[0009] A tritium removal and volume reduction method for a tritium-contaminated plant according to an embodiment of the present invention includes: determining that the tritium concentration in the tritium-contaminated plant has reached a set value, and evacuating the tritium-contaminated plant; performing primary condensation and gas-liquid separation on the evacuated gas to obtain primary condensate and primary treated gas, and collecting and storing the primary condensate separately; catalytically oxidizing the primary treated gas; and performing secondary condensation and gas-liquid separation on the catalytically oxidized primary treated gas to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately.

[0010] According to the tritium removal and volume reduction method for tritium-containing plants according to embodiments of the present invention, the first step is to perform primary condensation and gas-liquid separation on the extracted HTO, T2O, and ordinary water vapor, and collect and store the primary condensate separately. This separates a large amount of ordinary water vapor before catalytic oxidation, preventing it from entering the low-temperature adsorption treatment waste liquid or unified condensate along with the tritium water after oxidation. This reduces the volume of low-level tritium-containing wastewater after an accident, and lowers the pressure on the entire chain of wastewater storage, sampling and testing, batch traceability, transfer concentration, and solidification disposal after an accident. Then, the uncondensed HT, T2, and tritium-containing organic gases are catalytically oxidized to HTO and T2O, and secondary condensation and collection are performed. The secondary condensate is collected and stored separately, concentrating the tritium water generated by catalytic oxidation in a smaller volume. This ensures that the batch source of tritium-containing wastewater requiring subsequent key management is clear, the volume is small, and the activity determination is clear, further reducing the pressure on the entire chain of wastewater storage, sampling and testing, batch traceability, transfer concentration, and solidification disposal after an accident.

[0011] In some embodiments of the present invention, before the step of determining that the tritium concentration in the tritium-contaminated plant has reached a set value and evacuating the tritium-contaminated plant, the method includes maintaining the tritium-contaminated plant under negative pressure.

[0012] In some embodiments of the present invention, the step of determining that the tritium concentration in the tritium-contaminated plant has reached a set value and evacuating the tritium-contaminated plant further includes: determining that the gas pressure inside the tritium-contaminated plant is lower than a set negative pressure value, and controlling the evacuation rate of the tritium-contaminated plant and the dry gas replenishment rate of the tritium-contaminated plant.

[0013] In some embodiments of the present invention, after the step of performing secondary condensation and gas-liquid separation on the primary treated gas after catalytic oxidation to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, the method further includes: detecting the dew point and tritium concentration of the secondary treated gas; if the detected values ​​of the dew point and the tritium concentration are less than or equal to a set value, the secondary treated gas is refluxed back to the tritium-contaminated plant as a drying gas; if the detected value of either the dew point or the tritium concentration is greater than the set value, the secondary treated gas is introduced into another branch.

[0014] In some embodiments of the present invention, the step of catalytic oxidation of the primary treatment gas further includes: detecting the inlet temperature, oxygen content and humidity of the catalytic bed for gas catalytic oxidation, and controlling the heater power for catalytic oxidation.

[0015] In some embodiments of the present invention, the method further includes: performing tritium chemical speciation detection or differential detection before and after the catalytic bed to determine that the catalytic efficiency is lower than the target value, and switching to a standby catalytic bed.

[0016] In some embodiments of the present invention, after the step of performing secondary condensation and gas-liquid separation on the primary treated gas after catalytic oxidation to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, the method includes: continuously performing the operations of evacuation, primary condensation and gas-liquid separation, catalytic oxidation, and secondary condensation and gas-liquid separation on the tritium-containing plant, detecting the tritium concentration in the tritium-containing plant, and if the tritium concentration is less than or equal to the target value, stopping the tritium removal process or switching to standby mode, and continuing to maintain negative pressure ventilation and monitoring of the tritium-containing plant according to safety requirements.

[0017] In some embodiments of the present invention, the step of performing primary condensation and gas-liquid separation on the extracted gas to obtain primary condensate and primary treated gas, and collecting and storing the primary condensate separately, further includes: sampling and testing the primary condensate and determining its activity, and classifying the primary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for graded management; and the step of performing secondary condensation and gas-liquid separation on the catalytically oxidized primary treated gas to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, further includes: sampling and testing the secondary condensate and determining its activity, and classifying the secondary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for graded management.

[0018] According to an embodiment of the present invention, a tritium removal and volume reduction system for a tritium-contaminated plant is also provided, implementing the tritium removal and volume reduction method for a tritium-contaminated plant described in any of the preceding claims. The system includes: a tritium-contaminated plant; an exhaust fan, the inlet of which is connected to the tritium-contaminated plant; a primary condensation and gas-liquid separation device, the primary condensation and gas-liquid separation device being connected to the outlet of the fan; a primary condensate collection device, the primary condensate collection device being connected to the primary condensation and gas-liquid separation device; a catalytic oxidation device, the inlet of which is connected to the primary condensation and gas-liquid separation device; a secondary condensation and gas-liquid separation device, the secondary condensate collection device being connected to the secondary condensation and gas-liquid separation device; and an exhaust gas treatment device, the exhaust gas treatment device being connected to the outlet of the secondary condensation and gas-liquid separation device.

[0019] The tritium removal and volume reduction system for tritium-containing plants according to embodiments of the present invention, through the rational arrangement of various functional units, can cooperate to achieve the tritium removal and volume reduction method described above. Under the premise of maintaining negative pressure containment in the tritium-containing plant and preventing tritium leakage to the outside, it can achieve the volume reduction target of ordinary water pre-separation and centralized collection of tritium water, effectively reducing the pressure of handling and managing tritium-containing waste after an accident, and improving the safety and economy of accident handling in tritium-containing plants.

[0020] In some embodiments of the present invention, the device further includes: a gas supply pipe connected to the tritium-contaminated plant; a return pipe connected to the tritium-contaminated plant and the exhaust gas treatment device; a monitoring device connected to at least the tritium-contaminated plant and used to detect at least the tritium concentration, pressure difference, and humidity of the tritium-contaminated plant; and a control device electrically connected to the monitoring device, the exhaust fan, the primary condenser and gas-liquid separator, the catalytic oxidation device, the secondary condenser and gas-liquid separator, and the exhaust gas treatment device.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a flowchart of a tritium removal and volume reduction method for a tritium-contaminated plant according to some embodiments of the present invention; Figure 2 A schematic diagram illustrating the control of air supply and external humid air infiltration in a tritium-containing plant, provided for some embodiments of the present invention. Figure 3This is a schematic flowchart illustrating a tritium removal and volume reduction method for a tritium-contaminated plant provided in some embodiments of the present invention. Figure 4 This is a schematic diagram of a tritium removal and volume reduction system for a tritium-contaminated plant, provided in some embodiments of the present invention.

[0023] Figure label: 100. Tritium removal and volume reduction systems for tritium-containing plants; 10. Tritium-containing plant; 11. Accidental tritium release source; 12. Gas replenishment device; 20. Exhaust fan; 30. Primary condensation and gas-liquid separation device; 40. Primary condensate collection device; 50. Catalytic oxidation device; 60. Secondary condensation and gas-liquid separation device; 70. Secondary condensate collection device; 80. Tail gas treatment device; 90. Gas replenishment pipeline; 110. Return pipeline; 120. Monitoring device; 130. Control device. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0026] Furthermore, features specified as "first" or "second" may explicitly or implicitly include one or more of the same feature, used to distinguish and describe features, without any order or distinction of importance.

[0027] In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0029] The following is for reference. Figures 1-2 This describes a tritium removal and volume reduction method for a tritium-contaminated plant 10 according to an embodiment of the present invention.

[0030] like Figures 1 to 2 As shown, the tritium removal and volume reduction method for the tritium-contaminated plant 10 according to an embodiment of the present invention includes: Step S1: Determine that the tritium concentration in the tritium-contaminated plant 10 has reached the set value, and then evacuate the tritium-contaminated plant 10.

[0031] The accidental tritium release source 11 is located inside the tritium-contaminated building 10, which serves as the containment space for the accidental release. The accidental tritium release source 11 can be a leak point in a valve, pipe section, glove box interface, pump unit, inspection port, or local enclosure structure. The accidental tritium release source 11 may leak under abnormal or accidental operating conditions, and the tritium release forms include HT, T2, HTO, T2O, and tritium-containing organic matter. Depending on the specific accidental tritium release source 11, it may release one or more of HT, T2, HTO, T2O, and tritium-containing organic matter. The setpoint refers to the tritium concentration value that determines a tritium leak within the tritium-contaminated building 10; this setpoint can be specifically set as needed. When the tritium concentration in the tritium-contaminated building 10 reaches the setpoint, the exhaust fan 20 immediately evacuates the tritium-contaminated building 10 to reduce the tritium concentration.

[0032] Step S2: The extracted gas undergoes primary condensation and gas-liquid separation to obtain primary condensate and primary treated gas. The primary condensate is collected and stored separately. If the tritium released from the accident tritium release source 11 includes HTO and / or T2O, it preferentially condenses with ordinary water vapor to form primary condensate. Gas-liquid separation is then performed to obtain primary condensate and primary treated gas. The primary condensate is collected independently and can be managed as extremely low activity water, water awaiting retesting, or tritium-containing waste liquid, depending on the activity detection (tritium concentration) results.

[0033] Step S3: Catalytically oxidize the primary treatment gas. If the tritium released from the accidental tritium release source 11 includes HT, T2, or tritium-containing organic matter, it is not condensed in step S2, forming the primary treatment gas after gas-liquid separation. In step S3, HT, T2, or tritium-containing organic matter are converted into HTO and T2O by the catalytic oxidizer. Since most of the ordinary water vapor has been separated before oxidation, the water carrying tritium activity after oxidation is no longer diluted and amplified by a large amount of ordinary water.

[0034] Step S4: The primary treated gas after catalytic oxidation undergoes secondary condensation and gas-liquid separation to obtain secondary condensate and secondary treated gas. The secondary condensate is collected and stored separately. Specifically, the HTO and T2O generated in step S3 are condensed to form secondary condensate, and gas-liquid separation is performed to obtain secondary condensate and secondary treated gas. The secondary condensate is collected separately, and this small volume with relatively concentrated activity is used for subsequent shielded storage, activity retesting, concentration treatment, isotope recovery, or emission disposal.

[0035] Understandably, during the detritium removal process following the accident at the tritium-contaminated plant, the tritium gas could be pre-cooled and collected via gas-liquid separation before catalytic oxidation. This would allow ordinary water vapor in the accident exhaust to be preferentially condensed and separated before tritium oxidation, reducing the amount of low-radioactive tritium-containing wastewater generated by uniform condensation after oxidation. Collecting the condensates from the two condensation processes separately avoids the mixing of water with different activities and from different sources.

[0036] According to the tritium removal and volume reduction method of the tritium-containing plant 10 of the present invention, the HTO, T2O and ordinary water vapor after extraction are first separated by primary condensation, and the primary condensate is collected and stored separately. This separates a large amount of ordinary water vapor before catalytic oxidation, preventing it from entering the low-temperature adsorption treatment waste liquid or unified condensate together with the tritium water after oxidation. This reduces the volume of low-level tritium-containing wastewater after an accident and lowers the pressure on the entire chain of wastewater storage, sampling and testing, batch traceability, transfer concentration, and solidification disposal after an accident. Then, the uncondensed HT, T2 and tritium-containing organic gases are catalytically oxidized to HTO and T2O, and the secondary condensate is collected and stored separately. This concentrates the tritium water generated by catalytic oxidation into a smaller volume, making the batch source of tritium-containing wastewater that needs to be managed clearly clear, the volume small, and the activity determination clear. This further reduces the pressure on the entire chain of wastewater storage, sampling and testing, batch traceability, transfer concentration, and solidification disposal after an accident.

[0037] In some embodiments of the present invention, before determining that the tritium concentration in the tritium-containing plant 10 has reached a set value and evacuating the tritium-containing plant 10, the method includes maintaining the tritium-containing plant 10 under negative pressure. In the above technical solution, maintaining the tritium-containing plant 10 under negative pressure can prevent tritium from diffusing and leaking into the environment outside the plant, prevent tritium leakage from causing environmental risks, and improve environmental safety during accident handling at the tritium-containing plant 10.

[0038] In some embodiments of the present invention, before determining that the tritium concentration in the tritium-containing plant 10 has reached a set value and evacuating the tritium-containing plant 10, the method further includes: determining that the gas pressure inside the tritium-containing plant 10 is lower than a set negative pressure value, and controlling the evacuation rate of the tritium-containing plant 10 and the dry gas replenishment rate of the tritium-containing plant 10.

[0039] During the evacuation process of the tritium-containing plant 10, the plant 10 can be connected to an independent gas supply device 12 to replenish dry air, dry nitrogen, dry inert gas, or a mixture thereof to ensure that the plant remains under negative pressure throughout the evacuation process, preventing tritium leakage to the external environment. For scenarios with a risk of flammable hydrogen isotopes, air or inert gas supply can be selected based on oxygen content control requirements. Maintaining a negative pressure within the tritium-containing plant 10 can be achieved by controlling the evacuation rate, the dry gas supply rate, or a combination of both. The set negative pressure value refers to the value at which the plant 10 is maintained under negative pressure, and can be specifically set as needed. For example, this set negative pressure value can be from -50 Pa to -200 Pa.

[0040] In the above technical solution, by controlling the extraction rate and the dry gas replenishment rate, a stable negative pressure state can be maintained within the tritium-contaminated plant 10, preventing tritium leakage. Simultaneously, the infiltration of external humid air can be reduced, lowering the total water vapor load entering subsequent treatment units. This further reduces the volume of low-activity wastewater generated by primary condensation, improving the volume reduction effect of the tritium removal process. Through the coordinated control of emergency extraction rate, dry gas replenishment rate, and plant pressure difference, the replenishment rate is kept lower than the extraction rate, and the plant pressure difference is kept within a preset negative pressure window, thus balancing dehumidification, tritium removal, and radioactive containment safety.

[0041] In some embodiments of the present invention, after the step of secondary condensation and gas-liquid separation of the primary treatment gas after catalytic oxidation to obtain secondary condensate and secondary treatment gas, and collecting and storing the secondary condensate separately, the method further includes: detecting the dew point and tritium concentration of the secondary treatment gas; if the detected values ​​of the dew point and tritium concentration are less than or equal to a set value, the secondary treatment gas is refluxed back to the tritium-containing plant 10 as a dry gas; if the detected value of either the dew point or the tritium concentration is greater than the set value, the secondary treatment gas is introduced into other branches.

[0042] When the detected values ​​of dew point and tritium concentration of the secondary treated gas are less than or equal to the set values, for example, refer to Figure 2 The tail gas from secondary condensation and separation (i.e., secondary treated gas) can be used as dry makeup gas in the tritium-contaminated plant 10. The dry makeup gas is a negative pressure replacement type, not a positive pressure replacement. That is, under the premise that the emergency extraction volume is always greater than the makeup gas volume, controlled dry tail gas is used to replace a portion of the external unorganized humid air leakage. The control relationship is as follows: Figure 2 As shown: Air is drawn from the tritium-contaminated plant 10 at a preset emergency flow rate Qex. External humid air infiltrates the plant at an unorganized leakage rate Qleak. Qualified exhaust gas is replenished to the tritium-contaminated plant 10 at a controlled flow rate Qdry. The control device 130, in conjunction with the pressure difference between the inside and outside of the plant, Qex, Qdry, Qleak, exhaust gas dew point, and exhaust gas tritium concentration, adjusts the replenishment gas valve group to ensure that Qdry is always less than Qex, and the plant pressure difference is stably maintained within a preset negative pressure window (e.g., -50Pa to -200Pa). Under quasi-steady-state conditions, the external unorganized leakage rate and the replenishment gas rate satisfy an approximate relationship: Qleak = Qex – Qdry – Qsrc – Qmargin, where Qsrc is the amount of gas released from the emergency source or replenished by the process, and Qmargin is the margin required to maintain negative pressure and safety margin.

[0043] Therefore, the core function of controlled drying and gas replenishment is to reduce the infiltration of high-humidity external air, rather than to weaken the efficiency of emergency gas extraction. As long as the replenishment volume is constrained by the extraction volume and the plant maintains a negative pressure window, a larger Qdry results in a smaller Qleak, a lower ordinary steam load entering the primary pre-condenser, and less management pressure on the primary low-activity condensate and subsequent low-level tritium-containing wastewater. The preset values ​​for exhaust gas humidity and tritium concentration can refer to the required gas humidity and tritium concentration within 10 minutes of the tritium-containing plant, and can be specifically set as needed.

[0044] If either the dew point or the tritium concentration of the secondary treated gas exceeds a set value, the secondary treated gas will not be used as supplementary gas for the tritium-contaminated plant 10 but will be treated separately, and the secondary treated gas will be collected or transported. The collection or transport of the secondary treated gas may refer to transferring the secondary treated gas to a standby tritium removal unit, a retention attenuation container, or a compliant emission unit.

[0045] Understandably, reference Figure 3 Prior to the accident, the differential pressure, humidity, tritium concentration, exhaust gas dew point, and collection tank status of the tritium-containing plant were continuously monitored. After the accident was triggered, the emergency extraction volume Qex was increased and primary pre-condensation was put into operation. After the tritium-containing gas underwent catalytic oxidation and secondary condensation, if the exhaust gas met the tritium concentration and humidity requirements for recirculation, drying and makeup gas were put into operation. If the exhaust gas did not meet the recirculation conditions, it was transferred to standby treatment or compliant emission path via the recirculation / emission switching unit. Figure 3The corresponding optimal control logic is as follows: when the absolute value of the negative pressure in the plant is too large and the exhaust gas meets the reflux conditions, the amount of dry air replenishment is gradually increased to reduce the infiltration of external humid air; when the plant pressure difference approaches 0 Pa, the tritium concentration in the exhaust gas exceeds the reflux threshold, the dew point in the exhaust gas exceeds the set value, or the emergency exhaust fan 20 is abnormal, the amount of replenishment is reduced, the reflux is cut off, or the system is switched to the backup treatment path; after the accident ends, the system continues to run the post-treatment cycle until the tritium concentration in the plant meets the shutdown conditions.

[0046] In summary, this invention transforms the traditional "unified water removal after catalytic oxidation" process into a volume-reducing process of "pre-condensation and dehumidification before oxidation, secondary condensation and small-volume tritium water collection after oxidation, and controlled gas replenishment for low-humidity tail gas" through the tritium removal and volume reduction method, negative pressure gas replenishment relationship, two-stage condensation and graded liquid collection path and operation process of the tritium-containing plant 10. This maintains the accident containment capacity and tritium removal efficiency while reducing the volume of low-level tritium-containing wastewater and the post-accident treatment pressure.

[0047] In the above technical solution, if the detected values ​​of dew point and tritium concentration of the secondary treated gas are less than or equal to the set values, the low-humidity tail gas after secondary condensation can be controlled to supplement the tritium-containing plant 10. This not only enables the recovery and reuse of the treated tail gas, but also reduces the amount of unorganized infiltration of external humid air, which is beneficial for controlling the humidity inside the tritium-containing plant 10. At the same time, the above solution can reduce the moisture load entering the tritium removal system during an accident while maintaining the negative pressure of the plant, promoting the transformation of the tritium removal system from "converting all moisture into low-level discharge water" to a volume-reducing mode of "first separating ordinary water and then centrally capturing tritium-containing water", reducing the volume of low-level tritium-containing wastewater and the post-accident treatment pressure. In addition, the reuse of low-humidity tail gas can also reduce the consumption of additional external drying gas and reduce treatment costs. Furthermore, the above solution can also use tail gas dew point, tail gas tritium concentration, plant tritium concentration, plant pressure difference, and condensate activity as interlocking variables to control recirculation, discharge, standby tritium removal, and condensate diversion. If the detected value of either the dew point or the tritium concentration of the secondary treatment gas exceeds the set value, the exhaust gas will be transferred to a standby treatment or compliant emission path. This can prevent the backflow of substandard exhaust gas from adversely affecting the tritium concentration and humidity within the tritium-related plant 10, ensuring the stable and reliable operation of the entire tritium removal and volume reduction process and maintaining the system's tritium removal and volume reduction effect.

[0048] In some embodiments of the present invention, the step of catalytic oxidation of the condensed and gas-liquid separated gas further includes: detecting the inlet temperature, oxygen content and humidity of the catalytic bed for gas catalytic oxidation, and controlling the heater power for catalytic oxidation.

[0049] In the above technical solution, by detecting the inlet temperature, oxygen content and humidity of the catalytic bed of gas catalytic oxidation, and controlling the heater power of catalytic oxidation, it is possible to ensure that HT, T2 and tritium-containing organic matter are fully oxidized, and to prevent unoxidized tritium-containing gas from entering subsequent stages, which would lead to excessively high tritium concentration in the exhaust gas after secondary condensation. This ensures that the exhaust gas meets the safety threshold requirements before recirculation or emission.

[0050] In some embodiments of the present invention, the step of catalytic oxidation of the primary treatment gas further includes: performing tritium chemical speciation detection or differential detection before and after the catalytic bed to determine that the catalytic efficiency is lower than the target value, and switching to a standby catalytic bed.

[0051] Differential detection refers to detecting the difference in gas composition before and after entering the catalytic bed to determine whether the catalytic oxidation reaction is fully completed. When the detection result shows that the catalytic efficiency is lower than the preset target value, the control system automatically triggers the switching logic, directing the gas flow to the backup catalytic bed to ensure the continuity and reliability of the tritium removal process. The backup catalytic bed can be a redundant unit set in parallel, filled with the same or optimized catalyst ratio, possessing equal or higher catalytic activity to cope with abnormal operating conditions such as deactivation, poisoning, or thermal runaway of the main catalytic bed.

[0052] In the above technical solution, by setting up a backup catalytic bed and a switching mechanism, the main catalytic bed can be replaced in a timely manner if its performance is substandard, ensuring the stable operation of the catalytic oxidation process, avoiding insufficient conversion of tritium-containing gas due to insufficient catalytic efficiency, and thus affecting the overall tritium removal effect, thereby improving the reliability and stability of the tritium removal and volume reduction method of the tritium-related plant 10.

[0053] In some embodiments of the present invention, after the primary treated gas following catalytic oxidation undergoes secondary condensation and gas-liquid separation to obtain secondary condensate and secondary treated gas, and the secondary condensate is collected and stored separately, the method includes: continuously performing extraction, primary condensation and gas-liquid separation, catalytic oxidation, and secondary condensation and gas-liquid separation operations on the tritium-containing plant 10; detecting the tritium concentration in the tritium-containing plant 10; if the tritium concentration is less than or equal to the target value, stopping the tritium removal process or entering standby mode; and continuing to maintain negative pressure ventilation and monitoring of the tritium-containing plant 10 according to safety requirements. It is understood that after stopping the tritium removal process or entering standby mode, the condensate is classified and recorded, the catalyst status is checked, and the system is reset.

[0054] In the above technical solution, the tritium concentration in the tritium-containing plant 10 can be gradually reduced through continuous cyclic treatment until a safe shutdown standard is reached, thus completely completing the tritium removal work after the accident, avoiding the subsequent safety risks caused by residual tritium, ensuring that the tritium-containing plant 10 can be restored to a safe and usable state, and improving the integrity and reliability of the entire treatment process.

[0055] In some embodiments of the present invention, the step of performing primary condensation and gas-liquid separation on the extracted gas to obtain primary condensate and primary treated gas, and collecting and storing the primary condensate separately, further includes: sampling and testing the primary condensate and determining its activity, and classifying the primary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for graded management; and the step of performing secondary condensation and gas-liquid separation on the primary treated gas after catalytic oxidation to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, further includes: sampling and testing the secondary condensate and determining its activity, and classifying the secondary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for graded management.

[0056] The tiered management of condensate allows for setting different thresholds based on the radioactive waste management regulations of different facilities. Primary and secondary condensate can be sent to temporary storage tanks, online monitoring tanks, concentration units, isotope recovery units, or solidification units, respectively.

[0057] In the above technical solution, by sampling and testing the primary and secondary condensates separately, and implementing differentiated treatment based on the actual tritium activity of the condensates, the mixing of water with different activities and from different sources can be avoided, reducing the pressure on waste storage, testing, and disposal after an accident.

[0058] According to embodiments of the present invention, a tritium removal and volume reduction system 100 for a tritium-contaminated plant is also provided, implementing the tritium removal and volume reduction method for the tritium-contaminated plant 10 described in any of the preceding embodiments. For example... Figure 2 As shown, the tritium removal and volume reduction system 100 for a tritium-contaminated plant according to an embodiment of the present invention includes: a tritium-contaminated plant 10, an exhaust fan 20, a primary condensation and gas-liquid separation device 30, a primary condensate collection device 40, a catalytic oxidation device 50, a secondary condensation and gas-liquid separation device 60, a secondary condensate collection device 70, and a tail gas treatment device 80. The inlet of the exhaust fan 20 is connected to the tritium-contaminated plant 10. The primary condensation and gas-liquid separation device 30 is connected to the outlet of the fan. The primary condensate collection device 40 is connected to the primary condensation and gas-liquid separation device 30. The inlet of the catalytic oxidation device 50 is connected to the primary condensation and gas-liquid separation device 30. The secondary condensation and gas-liquid separation device 60 is connected to the outlet of the catalytic oxidation device 50. The secondary condensate collection device 70 is connected to the secondary condensation and gas-liquid separation device 60. The tail gas treatment device 80 is connected to the outlet of the secondary condensation and gas-liquid separation device 60.

[0059] The primary condenser and gas-liquid separator 30 may include a primary condenser and a primary gas-liquid separator, and the secondary condenser and gas-liquid separator 60 may include a secondary condenser and a secondary gas-liquid separator. The primary and secondary condensers may employ mechanical refrigeration heat exchangers, cryogenic cold traps, heat pipe heat exchangers, solution dehumidifiers, membrane dehumidifiers, or combined condensation dehumidification equipment. Furthermore, for low-temperature frosting conditions, the primary and secondary condensers may employ a dual-condenser alternating defrosting, bypass defrosting, or online defrosting structure.

[0060] The catalytic oxidation device 50 may employ, but is not limited to, a fixed bed, a honeycomb bed, a coated heat exchange reactor, a hydrophobic catalytic bed, or a multi-bed switching structure, etc. The catalyst may be, but is not limited to, precious metal catalysts such as platinum and palladium, or other catalytic materials capable of promoting hydrogen isotope oxidation, etc.

[0061] After the accident, the exhaust fan 20 extracts the tritium-containing gas from the tritium-contaminated plant 10. The tritium-containing gas first enters the primary condensation and gas-liquid separation device 30, where HTO, T2O, and a large amount of ordinary water vapor are condensed and separated into gas and liquid. The resulting low-activity primary condensate is stored in the primary condensate collection device 40. The uncondensed HT, T2, and volatile tritium-containing organic matter are then treated as primary gas and enter the catalytic oxidation device 50, where HT, T2, and tritium-containing organic matter are catalytically oxidized into HTO and T2O. The catalytically oxidized primary gas is then sent to the secondary condensation and gas-liquid separation device 60, where high-activity tritium water is collected and condensed. The resulting secondary condensate is stored in the secondary condensate collection device 70. Finally, the remaining secondary gas enters the tail gas treatment device 80 for further treatment. The entire process can achieve the staged collection of tritium-containing condensate, reduce the volume of high-activity tritium-containing wastewater that needs to be controlled, and at the same time reduce the amount of low-activity wastewater generated, thus reducing the overall process treatment pressure.

[0062] The primary condensate collection device 40 and the secondary condensate collection device 70 can refer to storage devices used to store tritium-containing liquids. The primary condensate collection device 40 and / or the secondary condensate collection device 70 may be equipped with shielding protection, liquid level interlocking, sampling ports, inert gas covering, and backflow prevention structures to prevent leakage, evaporation, or backflow of radioactive condensate and ensure the radiation protection safety of operators.

[0063] According to the tritium removal and volume reduction system 100 of the tritium-containing plant according to the present invention, by rationally arranging the functional units, it can cooperate to realize the tritium removal and volume reduction method of the tritium-containing plant 10. Under the premise of maintaining the negative pressure containment of the tritium-containing plant 10 and avoiding tritium leakage to the outside, it can achieve the volume reduction target of ordinary water pre-separation and centralized collection of tritium water, effectively reduce the pressure of treatment and control of tritium-containing waste after an accident, and improve the safety and economy of accident handling of the tritium-containing plant 10.

[0064] In some embodiments of the present invention, reference is made to Figure 2The tritium removal and volume reduction system 100 for the tritium-containing plant also includes: a gas supply pipe 90, a return pipe 110, a monitoring device 120, and a control device 130. The gas supply pipe 90 is connected to the tritium-containing plant 10; the return pipe 110 is connected to the tritium-containing plant 10 and the exhaust gas treatment device 80; the monitoring device 120 is connected to at least the tritium-containing plant 10 and is used to detect the tritium concentration, pressure difference, and humidity of the tritium-containing plant 10; the control device 130 is electrically connected to the monitoring device 120, the exhaust fan 20, the primary condenser and gas-liquid separator 30, the catalytic oxidation device 50, the secondary condenser and gas-liquid separator 60, and the exhaust gas treatment device 80.

[0065] The gas supply pipe 90 is connected to the gas supply device 12 to supply dry gas to the tritium-processing plant 10. The return pipe 110 can be used as supplementary gas to supply dry gas to the tritium-processing plant 10 when the treated exhaust gas meets the return conditions.

[0066] The exhaust gas treatment device 80 can be used for recirculation or emission, enabling switching control of exhaust gas treatment. The exhaust gas treatment device 80 can be connected to the recirculation pipe 110 and an external exhaust gas treatment system. Optionally, the recirculation pipe 110 is equipped with a make-up gas regulating valve, which can adjust the flow rate of the dry make-up gas when the tritium concentration and humidity of the exhaust gas are within acceptable limits. The monitoring device 120 can at least detect and report plant pressure differential, exhaust gas humidity, and tritium concentration data. The control device 130 can adjust the opening of the make-up gas regulating valve in real time based on the plant pressure differential, exhaust gas humidity, and tritium concentration data reported by the monitoring device 120, ensuring that the make-up gas volume maintains a stable negative pressure in the plant under acceptable exhaust gas conditions. When the tritium concentration and humidity of the exhaust gas are unacceptable, the exhaust gas is introduced into the exhaust gas treatment system and transferred to the system's backup tritium removal unit, retention attenuation container, or compliant emission unit.

[0067] During normal operation, the primary pre-condenser and secondary condenser are in standby or low-load circulation mode. Monitoring device 120 continuously monitors the plant's tritium concentration, internal and external pressure difference, temperature and humidity, emergency exhaust fan status, exhaust gas tritium concentration, and liquid level in each condensate collection tank. During the detritium removal phase, monitoring device 120 continuously monitors tritium concentration, exhaust gas tritium concentration, internal and external pressure difference, dew point, key node flow rates (make-up gas flow and extraction gas flow), liquid level / activity in each collection tank, and temperature and humidity.

[0068] In the above technical solution, the control device 130 dynamically adjusts the operating status of each component according to the monitoring data to ensure that the system responds quickly under accident conditions, automatically maintains the negative pressure window of the plant and stable extraction efficiency, and automatically uses low-humidity exhaust gas recirculation to replenish gas when the exhaust gas meets the standards, reducing the infiltration of external humid air. If the exhaust gas does not meet the standards, it automatically cuts off the recirculation and switches to the standby treatment or emission path, ensuring that the entire system is always in a safe and controllable operating state without much human intervention, reducing the radiation exposure risk of operators, and improving the automation level and response efficiency of the tritium removal and volume reduction process.

[0069] The following is combined Figures 1 to 3 This describes a specific embodiment of the tritium removal and volume reduction method for the tritium-containing plant 10 of the present invention.

[0070] The detritonation and volume reduction methods for tritium-contaminated plant 10 include: Step 1: Maintain a negative pressure state within 10 minutes of the tritium-containing plant.

[0071] Step 2: Determine that the tritium concentration in the tritium-containing plant 10 has reached the set value, and then evacuate the tritium-containing plant 10. Specifically, this involves ensuring that the gas pressure inside the tritium-containing plant 10 is below the set negative pressure value, and controlling the evacuation rate and the rate of replenishment of dry gas to the tritium-containing plant 10.

[0072] Step 3: The extracted gas is condensed and separated into gas and liquid to obtain primary condensate and primary treated gas. The primary condensate is collected and stored separately. The collected primary condensate is then sampled for testing and activity determination. The primary condensate is classified and managed according to target activity liquid, liquid to be retested, or radioactive waste liquid.

[0073] Step 4: Catalytically oxidize the primary treated gas. During the catalytic process, monitor the inlet temperature, oxygen content, and humidity of the catalytic oxidation catalytic bed, and control the heater power to catalytically oxidize the primary treated gas. Simultaneously, perform tritium chemical speciation detection or differential detection before and after the catalytic bed. If the catalytic efficiency is determined to be lower than the target value, switch to a backup catalytic bed.

[0074] Step 5: Perform secondary condensation and gas-liquid separation on the primary treated gas after catalytic oxidation to obtain secondary condensate and secondary treated gas. Collect and store the secondary condensate separately. Sample the collected secondary condensate for testing and activity determination. Classify the secondary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for hierarchical management.

[0075] Step 6: Detect the dew point and tritium concentration of the secondary treatment gas. If the detected values ​​of the dew point and tritium concentration are less than or equal to the set values, the secondary treatment gas is returned to the tritium-related plant 10 as dry gas. If the detected value of either the dew point or the tritium concentration is greater than the set value, the secondary treatment gas is introduced into other branches.

[0076] Step 7: Continuously perform the following operations on the tritium-containing plant 10: evacuation, primary condensation and gas-liquid separation, catalytic oxidation, and secondary condensation and separation. Monitor the tritium concentration in the tritium-containing plant 10. If the tritium concentration is less than or equal to the target value, stop the tritium removal process or enter standby mode. Continue to maintain negative pressure ventilation and monitoring of the tritium-containing plant 10 according to safety requirements. Subsequently, complete the condensate classification and recording, catalyst status check, and system reset.

[0077] To further illustrate the effects and advantages of this invention, a 100m³ negative pressure tritium-contaminated cleanroom is used as an example. During normal operation, the indoor temperature is 20-24℃, and the relative humidity is 40%-60%, with the cleanroom maintaining a negative pressure of approximately -100Pa relative to the outside environment. Before the accident, only water vapor in the static air of the room is considered, with a total condensation volume of approximately 0.7-1.3 kg. After the accident, assuming the tritium release from the system is primarily in the forms of HT and T2, the emergency exhaust rate of the cleanroom is increased to 1000m³ / h; the external environment is 30℃, with a relative humidity of 60%, and an absolute humidity of approximately 18g / m³.

[0078] When using the traditional "catalytic oxidation + low-temperature adsorption / unified condensation" route, the emergency exhaust causes continuous leakage of external humid air into the plant. When the replenishment air is mainly supplied by external unorganized air leakage, the ordinary water load entering the tritium removal system is approximately 18 kg / h. If the emergency response and subsequent purification last for 10 hours, approximately 180 kg of ordinary water will enter the low-temperature adsorption, condensation, or regeneration stage after catalytic oxidation with the emergency exhaust air, mixing with the tritium-containing water generated by oxidation to form a large volume of low-level tritium-containing wastewater, requiring corresponding temporary storage, sampling, testing, and treatment procedures.

[0079] When using the scheme of this invention, the tritium-containing humid air from the accident undergoes primary condensation and gas-liquid separation. The primary pre-condenser cools the gas to -10~0℃, allowing ordinary water vapor to preferentially condense and be collected. Since the accident release is mainly HT and T2, the elemental tritium has not yet been oxidized to HTO during the primary pre-condensation stage. Therefore, the tritium activity of the primary condensate is significantly lower than that of conventional unified condensate. After online or offline activity measurement, the portion of the primary condensate that meets management requirements is included in the low-activity water or water to be retested path, and does not directly enter the low-level tritium-containing wastewater post-treatment chain; the portion exceeding the activity threshold is then managed as tritium-containing wastewater.

[0080] The primary treated gas, after primary pre-condensation and dehumidification, undergoes catalytic oxidation, converting the remaining HT and T2 into HTO and T2O. Subsequently, the catalytically oxidized primary treated gas enters the secondary condensation and gas-liquid separation stage, where the tritium water generated by oxidation and a small amount of residual moisture are collected. This secondary condensate has a much smaller volume than traditional uniform condensate, but its tritium activity is relatively concentrated, making it more suitable for subsequent shielded storage, isotope recovery, concentration, or solidification.

[0081] Meanwhile, if the secondary treated gas after secondary condensation meets the requirements for reflux tritium concentration and dew point, 600 m³ / h of it will be used as dry replenishment gas and returned to the plant. Under the condition that the emergency extraction rate remains unchanged at 1000 m³ / h and the plant maintains a negative pressure window, the unorganized leakage of external humid air can be approximately reduced to 400 m³ / h, with an external moisture load of approximately 7.2 kg / h. If the emergency response lasts for 10 hours, the ordinary moisture brought in by the external humid air will be approximately 72 kg, a reduction of approximately 108 kg compared to the condition without dry replenishment gas.

[0082] As demonstrated in this implementation example, this invention does not reduce the total amount of tritium captured, but rather optimizes the timing and collection location of water entering the tritium removal system: ordinary water is preferentially separated before oxidation, and the tritium-containing water generated by oxidation is collected in small volumes after oxidation. The low-humidity secondary treatment gas recirculation after secondary condensation reduces the introduction of external humid air. This significantly reduces the volume of low-level tritium-containing wastewater after an accident, and reduces the pressure on the entire chain of waste liquid storage, batch testing, transportation, and post-treatment.

[0083] In the description of this specification, references to terms such as "some embodiments," "optionally," "furthermore," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0084] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A method for detritonation and volume reduction in a tritium-containing factory, characterized in that, include: Once the tritium concentration in the tritium-contaminated plant is determined to have reached a set value, the plant will be evacuated. The extracted gas undergoes primary condensation and gas-liquid separation to obtain primary condensate and primary treated gas, and the primary condensate is collected and stored separately. The primary treated gas is catalytically oxidized; The primary treated gas after catalytic oxidation is subjected to secondary condensation and gas-liquid separation to obtain secondary condensate and secondary treated gas, and the secondary condensate is collected and stored separately.

2. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 1, characterized in that, Before the step of determining that the tritium concentration in the tritium-contaminated plant has reached a set value and evacuating the tritium-contaminated plant, the method includes: Maintain a negative pressure environment inside the tritium-containing plant.

3. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 2, characterized in that, The step of determining that the tritium concentration in the tritium-contaminated plant has reached a set value and then evacuating the tritium-contaminated plant further includes: If the gas pressure inside the tritium-contaminated plant is determined to be lower than a set negative pressure value, the pumping rate of the tritium-contaminated plant and the replenishment rate of the dry gas in the tritium-contaminated plant shall be controlled.

4. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 3, characterized in that, After the step of performing secondary condensation and gas-liquid separation on the primary treated gas after catalytic oxidation to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, the method further includes: The dew point and tritium concentration of the secondary treatment gas are detected. If the detected values ​​of the dew point and the tritium concentration are less than or equal to the set values, the secondary treatment gas is returned to the tritium-contaminated plant as a drying gas. If the detected value of either the dew point or the tritium concentration is greater than the set value, the secondary treatment gas is introduced into other branches.

5. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 1, characterized in that, The step of catalytically oxidizing the primary treated gas further includes: The inlet temperature, oxygen content, and humidity of the catalytic bed in gas catalytic oxidation are monitored to control the heater power of the catalytic oxidation process.

6. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 1, characterized in that, Also includes: Tritium chemical speciation detection or differential detection is performed before and after the catalytic bed to determine if the catalytic efficiency is lower than the target value, and then the backup catalytic bed is switched.

7. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 1, characterized in that, After the step of subjecting the primary treated gas after catalytic oxidation to secondary condensation and gas-liquid separation to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, the method includes: The detritium removal process is continuously performed on the tritium-containing plant, including extraction, primary condensation and gas-liquid separation, catalytic oxidation, and secondary condensation and gas-liquid separation. The tritium concentration in the plant is monitored. If the tritium concentration is less than or equal to the target value, the detritium removal process is stopped or the plant is put into standby mode. Negative pressure ventilation and monitoring of the tritium-containing plant are maintained according to safety requirements.

8. The tritium removal and volume reduction method for a tritium-contaminated plant according to claim 1, characterized in that, The step of performing primary condensation and gas-liquid separation on the extracted gas to obtain primary condensate and primary treated gas, and collecting and storing the primary condensate separately, further includes: sampling and testing the primary condensate and determining its activity, and classifying the primary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for hierarchical management. The step of performing secondary condensation and gas-liquid separation on the primary treated gas after catalytic oxidation to obtain secondary condensate and secondary treated gas, and collecting and storing the secondary condensate separately, further includes: sampling and testing the secondary condensate and determining its activity, and classifying the secondary condensate into target activity liquid, liquid to be retested, or radioactive waste liquid for hierarchical management.

9. A tritium removal and volume reduction system for a tritium-contaminated plant, characterized in that, The system for implementing the tritium removal and volume reduction method for a tritium-contaminated plant as described in any one of claims 1 to 8 comprises: Tritium-related factory buildings; An exhaust fan, the air inlet of which is connected to the tritium-contaminated plant; A primary condenser and gas-liquid separator is connected to the outlet of the fan. A primary condensate collection device, wherein the primary condensate collection device is connected to the primary condenser and gas-liquid separator; A catalytic oxidation device, the inlet of which is connected to the primary condenser and gas-liquid separator; A secondary condenser and gas-liquid separator is provided, wherein the secondary condenser and gas-liquid separator is connected to the outlet of the catalytic oxidation unit; A secondary condensate collection device, wherein the secondary condensate collection device is connected to the secondary condensation and gas-liquid separation device; An exhaust gas treatment device is provided, which is connected to the outlet of the secondary condenser and gas-liquid separator.

10. The tritium removal and volume reduction system for a tritium-contaminated plant according to claim 9, characterized in that, Also includes: A gas supply pipeline, which is connected to the tritium-contaminated plant; A return pipe, which connects the tritium-contaminated plant and the exhaust gas treatment device; A monitoring device, which is connected to at least the tritium-contaminated plant and is used to detect the tritium concentration, pressure difference, and humidity of the tritium-contaminated plant; A control device electrically connected to the monitoring device, the exhaust fan, the primary condenser and gas-liquid separator, the catalytic oxidation device, the secondary condenser and gas-liquid separator, and the exhaust gas treatment device.

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