Integrated treatment apparatus for liquid radioactive waste generated during decommissioning of nuclear power plant

Abstract

The present invention relates to an integrated treatment apparatus for liquid radioactive waste generated during decommissioning of a nuclear power plant. The purpose of the disclosure is to efficiently treat liquid radioactive waste generated during decommissioning of a nuclear power plant by applying processes suitable for respective properties and conditions of liquid radioactive waste, thereby significantly reducing radioactive waste after treatment and reducing treatment costs. The integrated treatment apparatus comprises: a liquid radioactive waste storage unit (20) for separately classifying and temporarily storing low-concentration, high-concentration, and organic liquid radioactive waste; a pre-treatment unit (30) for separating and collecting foreign substances, oil, impurities, precipitates, and solids contained in the low-concentration, high-concentration, and organic liquid radioactive waste, classifying the separated foreign substances as miscellaneous solid radioactive waste to treat the classified miscellaneous solid radioactive waste, and decomposing organic compounds; a main treatment unit (40) for removing radioactive contaminants contained in the liquid radioactive waste; a post-treatment unit (50) for purifying exhaust gas and exhaust liquid; and a control panel (60) for controlling the operation of the liquid radioactive waste storage unit (20), the pre-treatment unit (30), the main treatment unit (40), and the post-treatment unit (50).

Description

Integrated treatment system for liquid radioactive waste generated during the decommissioning of nuclear power plants

[0001] The present invention relates to an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, and more specifically, to an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant that can treat a large amount of liquid radioactive waste generated during the decommissioning of a nuclear power plant using a suitable treatment process according to each property and condition, thereby significantly improving the treatment efficiency of liquid radioactive waste and reducing treatment costs, as well as significantly reducing the amount of secondary radioactive waste such as radioactive waste resin.

[0002]

[0003] Generally, during the decommissioning of nuclear power plants, decontamination processes are performed to remove radioactive materials from systems and equipment contaminated by radioactive substances. Various physical and chemical methods exist for decontamination, and the execution of these processes generates large quantities of liquid radioactive waste with diverse properties and conditions.

[0004] Referring to the attached drawing Fig. 1, conventionally, liquid radioactive waste of various properties and conditions is treated using an ion exchange resin or by evaporating the liquid radioactive waste using a waste liquid evaporator, and the resulting radioactive concentrated waste liquid is treated by solidification.

[0005] The details regarding the conventional method for treating liquid radioactive waste as described above are specifically disclosed in the publications of Korean Published Patent No. 10-1999-0017159 (March 15, 1999) and Korean Registered Patent No. 10-1224725 (January 15, 2013).

[0006] Conventional methods for treating liquid radioactive waste involve treating liquid radioactive waste in the form of suspensions, slurries, and solutions containing chelate compounds using ion exchange resins, or treating the radioactive concentrated waste liquid generated after evaporation using an evaporator by solidifying it.

[0007] However, the above-mentioned conventional method for treating liquid radioactive waste has the problem that when using ion exchange resin, a large amount of filtrate adheres to the surface of the ion exchange resin, significantly reducing the ion exchange rate within a short period and shortening the replacement cycle of the ion exchange resin, thereby greatly increasing the amount of secondary radioactive waste, radioactive waste resin, and when using an evaporator, it takes a long time to evaporate and treat a large amount of liquid radioactive waste, which not only significantly reduces work productivity but also generates a large amount of solidified radioactive concentrated waste liquid and incurs high treatment costs for processing the solidified radioactive concentrated waste liquid.

[0008]

[0009] The applicant has made various efforts to solve the aforementioned conventional problems, and as a result, has developed an integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant. As clearly shown in the attached drawing Fig. 2, the composition comprises: a liquid radioactive waste classification and storage step (S100) in which liquid radioactive waste generated during the decommissioning of a target nuclear power plant is classified into low-concentration liquid radioactive waste, high-concentration liquid radioactive waste, and organic liquid radioactive waste according to their properties and conditions, and stored separately in respective storage tanks; and a pretreatment step (S200) in which, during the liquid radioactive waste classification and storage step, foreign substances, oil, impurities, precipitates, and solids contained in the liquid radioactive waste stored in each storage tank are separated and collected, and organic matter is decomposed. It comprises a main treatment step (S300) for removing radioactive contaminants contained in the liquid radioactive waste that has passed through the above pretreatment step (S200), separating the condensate from which radioactive contaminants have been removed into gas and liquid, and generating exhaust gas and discharge liquid; and a post-treatment step (S400) for purifying the exhaust gas and discharge liquid discharged after gas and liquid separation in the above main treatment step (S300) and discharging the purified exhaust gas and discharge liquid into the exhaust and drainage system of a building.

[0010] The present applicant’s integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant, having such a configuration, classifies the large amount of liquid radioactive waste generated during the decommissioning of a nuclear power plant into low-concentration liquid radioactive waste in a solution state, high-concentration liquid radioactive waste in a solution state containing suspension and slurry, and organic liquid radioactive waste in an organic solvent system, and ensures that each of the classified low-concentration, high-concentration, and organic liquid radioactive wastes can be safely and reliably treated according to a designated treatment process, thereby having the advantage of significantly reducing the amount of radioactive waste resulting from the treatment and secondary radioactive waste generated during treatment, while simultaneously significantly improving work productivity for the treatment of liquid radioactive waste.

[0011] Therefore, the applicant had a need to develop an integrated treatment device for liquid radioactive waste generated during the decommissioning of operating nuclear power plants and nuclear power plants subject to decommissioning, which can efficiently implement the applicant’s integrated treatment method for liquid radioactive waste generated during the decommissioning of operating nuclear power plants and nuclear power plants subject to decommissioning that has these advantages, and can be operated very easily even by unskilled personnel.

[0012]

[0013] The present invention was devised in accordance with the applicant's development needs as described above, and its purpose is to provide an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant that can efficiently implement an integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant, which classifies the large amount of liquid radioactive waste generated during the decommissioning of a nuclear power plant into low-concentration liquid radioactive waste in a solution state, high-concentration liquid radioactive waste in a solution state containing suspension and slurry, and organic liquid radioactive waste in an organic solvent system, and ensures that each of the classified low-concentration, high-concentration, and organic liquid radioactive wastes can be safely and reliably treated according to a designated treatment process, thereby significantly reducing the amount of secondary radioactive waste generated during the treatment of radioactive waste and liquid radioactive waste as a result of treatment, while simultaneously significantly improving work productivity for the treatment of liquid radioactive waste.

[0014]

[0015] The objective of the present invention is to provide a liquid radioactive waste sorting storage step in which liquid radioactive waste generated during the decommissioning of a nuclear power plant is classified and stored in separate storage tanks as low-concentration liquid radioactive waste, high-concentration liquid radioactive waste, and organic liquid radioactive waste; a pretreatment step in which, in the liquid radioactive waste sorting storage step, foreign substances, oil, impurities, precipitates, and solids contained in the liquid radioactive waste stored in each storage tank are separated and collected, and organic matter is decomposed; and a main treatment step in which radioactive contaminants contained in the liquid radioactive waste that has passed through the pretreatment step are removed, the condensate from which radioactive contaminants have been removed is gas-liquid separated, and exhaust gas and discharge liquid are generated. In an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant for implementing an integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant, comprising a post-treatment step of purifying the exhaust gas and effluent discharged by gas-liquid separation in the above-mentioned main treatment step and discharging the purified exhaust gas and effluent into the exhaust and drainage system of a building, the treatment device comprises: a liquid radioactive waste storage unit composed of a plurality of storage tanks that separately store low-concentration, high-concentration, and organic liquid radioactive waste and discharge the stored liquid radioactive waste when necessary; A pretreatment unit connected to the discharge port of each storage tank of the liquid radioactive waste storage unit, which separates and collects foreign substances, oil, impurities, precipitates, and solids contained in low-concentration, high-concentration, and organic liquid radioactive waste transported from each storage tank, decomposes organic compounds contained in the organic liquid radioactive waste, classifies and processes the separated foreign substances, oil, impurities, precipitates, and solids as miscellaneous solid radioactive waste, and decomposes organic compounds contained in the organic liquid radioactive waste; and a main treatment unit that removes radioactive contaminants contained in the liquid radioactive waste transported through the pretreatment unit and separates the exhaust gas containing liquid vapor from which radioactive contaminants have been removed into exhaust gas and discharge liquid.This can be achieved by an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by comprising: a post-treatment unit that purifies the exhaust gas and effluent transported through the main treatment unit and discharges the purified exhaust gas and effluent into the exhaust and drainage system of a building; and a control panel that is respectively connected to the various sensing means, driving and opening / closing auxiliary devices of the liquid radioactive waste storage unit, pre-treatment unit, main treatment unit, and post-treatment unit, controls the operation of each auxiliary device, and inputs control commands from an operator.

[0016]

[0017] The integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention classifies the liquid radioactive waste generated during the decommissioning of a nuclear power plant into low-concentration, high-concentration, and organic liquid radioactive waste according to each property and condition, and performs pretreatment and main treatment processes suitable for each liquid radioactive waste to remove radioactive contaminants contained in each liquid radioactive waste, and sequentially performs a post-treatment process to purify the exhaust gas and discharge liquid generated during the main treatment process, thereby having the effect of significantly improving the treatment efficiency of liquid radioactive waste and reducing treatment costs, as well as significantly reducing the amount of secondary radioactive waste, such as radioactive waste resin generated during the treatment process of liquid radioactive waste and radioactive waste, which are the results of the treatment of liquid radioactive waste.

[0018]

[0019] FIG. 1 is a schematic process diagram illustrating a conventional liquid radioactive waste treatment process for liquid radioactive waste generated at a nuclear power plant, and

[0020] FIG. 2 is a block diagram illustrating the configuration of an integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant of the present applicant, and

[0021] FIG. 3 is a block diagram schematically illustrating the configuration of an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention and the mutual organic correlation between each component, and

[0022] FIG. 4 is a block diagram illustrating the detailed configuration of the pretreatment unit and the mutual organic correlation between each component of the integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention as exemplified in FIG. 3.

[0023] FIG. 5 is a schematic cross-sectional view illustrating a coagulation sedimentation tank in the configuration of the pretreatment unit of the integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention as exemplified in FIG. 4.

[0024] FIG. 6 is a block diagram illustrating the detailed configuration of the main processing unit and the mutual organic correlation between each component among the components of the integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention as exemplified in FIG. 3.

[0025] FIG. 7 is a block diagram illustrating the detailed configuration of the post-treatment unit and the mutual organic correlation between each component of the integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention as exemplified in FIG. 3.

[0026] FIG. 8 is a schematic cross-sectional view illustrating a liquid radioactive waste storage section in the configuration of an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention as exemplified in FIG. 3.

[0027] FIG. 9 is a block diagram illustrating the components connected to the control panel and whose operation is controlled by the control panel, and the mutual organic correlation between each component, among the components of the integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention as exemplified in FIG. 3.

[0028]

[0029] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but can be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the invention of the scope and nature of the invention, and are limited by the claims of the present invention.

[0030] In describing the embodiments of the present invention, if it is determined that a detailed description of already known functions or configurations could unnecessarily obscure the essence of the invention, such detailed description will be omitted. Furthermore, the terms described below are defined considering the functions in the embodiments of the present invention, and these may vary depending on the intentions or conventions of the user or operator. Therefore, their definitions should be based on the content throughout this specification.

[0031] Hereinafter, with reference to the attached drawings FIGS. 2 to 9, a preferred embodiment of the integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention will be described in detail.

[0032] Referring to FIGS. 2 to 9, the integrated treatment device (10) for liquid radioactive waste generated during the decommissioning of a nuclear power plant according to the present invention comprises: a liquid radioactive waste sorting storage step (S100) in which liquid radioactive waste generated during the decommissioning of a nuclear power plant is sorted and stored in separate storage tanks as low-concentration liquid radioactive waste, high-concentration liquid radioactive waste, and organic liquid radioactive waste; a pretreatment step (S200) in which foreign substances, oil, impurities, precipitates, and solids contained in the liquid radioactive waste stored in each storage tank in the liquid radioactive waste sorting storage step are separated and collected, and organic matter is decomposed; and a main treatment step (S300) in which radioactive contaminants contained in the liquid radioactive waste that has passed through the pretreatment step (S200) are removed, the condensate from which radioactive contaminants have been removed is gas-liquid separated, and exhaust gas and discharge liquid are generated. The present applicant has devised an integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant, comprising a post-treatment step (S400) for purifying the exhaust gas and discharge liquid that are separated and discharged in the main treatment step (S300) and discharging the purified exhaust gas and discharge liquid into the exhaust and drainage system of a building, wherein the composition comprises a liquid radioactive waste storage unit (20), a pre-treatment unit (30), a main treatment unit (40), a post-treatment unit (50), and a control panel (60).

[0033] The above liquid radioactive waste storage unit (20) is composed of multiple storage tanks (21)(22)(23) that separately store low-concentration, high-concentration, and organic liquid radioactive waste and discharge the stored liquid radioactive waste when necessary.

[0034] The above pretreatment unit (30) is connected to the outlets of each storage tank (21)(22)(23) of the liquid radioactive waste storage unit (20) and separates and collects foreign substances, oil, impurities, precipitates, and solids contained in low-concentration, high-concentration, and organic liquid radioactive waste transferred from each storage tank (21)(22)(23), decomposes organic compounds contained in organic liquid radioactive waste, classifies and processes the separated foreign substances, oil, impurities, precipitates, and solids as miscellaneous solid radioactive waste, and decomposes organic compounds contained in organic liquid radioactive waste.

[0035] The above main treatment unit (40) removes radioactive contaminants contained in the liquid radioactive waste transported through the above pretreatment unit (30), and separates the exhaust gas containing the liquid vapor from which radioactive contaminants have been removed into exhaust gas and discharge liquid.

[0036] The above post-processing unit (50) purifies the exhaust gas and discharge liquid that are conveyed through the above main processing unit (40), and discharges the purified exhaust gas and discharge liquid to the exhaust and drainage system of the building.

[0037] The above control panel (60) is connected to various sensing means, driving and opening / closing auxiliary devices of the liquid radioactive waste storage unit (20), pre-treatment unit (30), main treatment unit (40), and post-treatment unit (50), respectively, controls the operation of each auxiliary device, and inputs control commands from an operator.

[0038]

[0039] Referring again to the attached drawings Fig. 3, Fig. 8 and Fig. 9, the liquid radioactive waste storage unit (20) temporarily stores liquid radioactive waste of various properties and conditions generated at a nuclear power plant, separating low-concentration, high-concentration, and organic liquid radioactive waste, and discharges the stored liquid radioactive waste when necessary. It is composed of a low-concentration liquid radioactive waste storage tank (21), a high-concentration liquid radioactive waste storage tank (22), and an organic liquid radioactive waste storage tank (23).

[0040] The above low-concentration liquid radioactive waste storage tank (21) is a storage tank having an outlet (21a) formed on the lower side, a first solenoid valve (21b) mounted on the outlet (21a) to open and close the outlet (21a), and a first water level sensor (21c) mounted on the inner side to detect the water level and transmit the detection signal, and temporarily stores low-concentration liquid radioactive waste inside.

[0041] The above high-concentration liquid radioactive waste storage tank (22) is a storage tank having an outlet (22a) formed on the lower side, a second solenoid valve (22b) mounted on the outlet (22a) to open and close the outlet (22a), and a second water level sensor (22c) mounted on the inner side to detect the water level and transmit the detection signal, and temporarily stores high-concentration liquid radioactive waste inside.

[0042] The above organic liquid radioactive waste storage tank (23) is a storage tank having an outlet (23a) formed on the lower side, a third solenoid valve (23b) mounted on the outlet (23a) to open and close the outlet (23a), and a third water level sensor (23c) mounted on the inner side to detect the water level and transmit the detection signal, and temporarily stores organic liquid radioactive waste inside.

[0043]

[0044] Referring to FIGS. 3, 4, 5 and 9, the pretreatment unit (30) is connected to the outlets of each storage tank (21)(22)(23) of the liquid radioactive waste storage unit (20) and is intended to separate and collect foreign substances, oil, impurities, precipitates, and solids contained in low-concentration, high-concentration, and organic liquid radioactive waste transferred from each storage tank (21)(22)(23), classify and process the separated foreign substances, oil, impurities, precipitates, and solids as miscellaneous solid radioactive waste, and decompose organic compounds contained in the organic liquid radioactive waste. It comprises a foreign substance separator (31), a low-concentration liquid radioactive waste supply pipe (32), a high-concentration liquid radioactive waste supply pipe (33), an organic liquid radioactive waste supply pipe (34), an oil separator (35), a coagulation sedimentation tank (36), and an organic It consists of a compound decomposition means (37).

[0045] The above foreign substance separator (31) is equipped with an inlet (31a) into which liquid radioactive waste is introduced, a liquid radioactive waste outlet (31b) (31c) into which liquid radioactive waste from which foreign substances have been removed is discharged, and a foreign substance outlet (31d) for discharging foreign substances separated from the liquid radioactive waste, and separates and removes foreign substances contained in the liquid radioactive waste.

[0046] The above low-concentration liquid radioactive waste supply pipe (32) is a connecting pipe equipped with a first pumping means (32a), and connects the outlet (21a) of the low-concentration liquid radioactive waste storage tank (21) of the liquid radioactive waste storage unit (20) to the inlet (31a) of the foreign substance separator (31), and pumps the low-concentration liquid radioactive waste stored in the low-concentration liquid radioactive waste storage tank (21) by the first pumping means (32a) and supplies it to the foreign substance separator (31).

[0047] The above high-concentration liquid radioactive waste supply pipe (33) is a connecting pipe equipped with a second pumping means (33a), a fourth solenoid valve (33b) that opens and closes the flow path, a branch pipe (33c) that branches off in the section between the second pumping means (33a) and the fourth solenoid valve (33b), and a fifth solenoid valve (33d) that is mounted on the branch pipe (33c) to open and close the branch pipe, and the discharge port (22a) of the high-concentration liquid radioactive waste storage tank (22) of the liquid radioactive waste storage unit (20) and the inlet port (31a) of the foreign substance separator (31) are connected in communication, and the high-concentration liquid radioactive waste stored in the high-concentration liquid radioactive waste storage tank (22) is pumped by the second pumping means (33a) and supplied to the foreign substance separator (31).

[0048] The above organic liquid radioactive waste supply pipe (34) is a connecting pipe equipped with a third pumping means (34a), a sixth solenoid valve (34b) that opens and closes the flow path, a branch pipe (34c) that branches off in the section between the third pumping means (34a) and the sixth solenoid valve (34b), and a seventh solenoid valve (34d) that is mounted on the branch pipe (34c) to open and close the branch pipe (34c). It connects the outlet (23a) of the organic liquid radioactive waste storage tank (23) of the liquid radioactive waste storage unit (20) to the inlet (31a) of the foreign substance separator (31) in a manner that is in communication with the outlet (23a) of the organic liquid radioactive waste storage tank (23) of the liquid radioactive waste storage unit (20), and pumps the organic liquid radioactive waste stored in the organic liquid radioactive waste storage tank (23) by the third pumping means (34a) and supplies it to the foreign substance separator (31).

[0049] The above oil separator (35) is equipped with an inlet (35a) into which liquid radioactive waste is introduced, two liquid radioactive waste outlets (35b-1) (35b-2) into which liquid radioactive waste from which oil has been removed is discharged, eighth and ninth solenoid valves (35c) (35d) respectively mounted on the liquid radioactive waste outlets (35b-1) (35b-2) to open and close each liquid radioactive waste outlet (35b-1) (35b-2), and an oil outlet (35e) for discharging oil separated from the liquid radioactive waste, and the inlet (35a) is connected to the liquid radioactive waste outlet (31b) of the foreign substance separator (31) by a connecting pipe, and separates and removes oil contained in the liquid radioactive waste introduced from the foreign substance separator (31).

[0050] The above-mentioned coagulation sedimentation tank (36) is connected to the branch pipes (33c) (34c) of the high-concentration liquid radioactive waste supply pipe (33) and the organic liquid radioactive waste supply pipe (34), and to the liquid radioactive waste discharge port (35b-2) equipped with the ninth solenoid valve (35d) of the oil separator (35), respectively, and coagulates and settles high-concentration and organic liquid radioactive waste flowing in from the high-concentration and organic liquid radioactive waste storage tanks (33) (34) of the liquid radioactive waste storage unit (20) or high-concentration and organic liquid radioactive waste from which foreign substances and oil have been removed flowing in from the oil separator (35). It comprises an inlet port (36a) into which liquid radioactive waste flows in, a liquid radioactive waste discharge port (36b) for discharging liquid radioactive waste in which the sedimentation reaction is completed by the coagulation sedimentation process, and a sediment discharge port (36c) for discharging sediment. It is a water tank having a sediment transfer unit (36d), a stirring unit (36e), a fourth water level sensing means (36f), and a coagulant supply unit (36g).

[0051] The above sediment transfer unit (36d) is built into the coagulation sedimentation tank (36) to be connected to the control panel (60) and transfers the sediment settled on the bottom surface of the coagulation sedimentation tank (36) toward the sediment discharge port (36c).

[0052] The above stirring unit (36e) is built into the coagulation sedimentation tank (36) to be connected to the control panel (60) and mixes the liquid radioactive waste in the coagulation sedimentation tank (36).

[0053] The fourth water level sensing means (36f) is mounted on the inner side of the coagulation sedimentation tank (36) to be connected to the control panel (60), and detects the water level of liquid radioactive waste flowing into the coagulation sedimentation tank (36) and transmits the water level sensing signal.

[0054] The above coagulant supply unit (36g) is mounted on the upper part of the coagulation sedimentation tank (36) to be connected to the control panel (60), and a coagulant is supplied to the liquid radioactive waste introduced into the coagulation sedimentation tank (36) so that the liquid radioactive waste is coagulated and settled.

[0055] The above organic compound decomposition means (37) decomposes organic compounds contained in organic liquid radioactive waste stored in the above coagulation sedimentation tank (36), and as such organic compound decomposition means (37), it is preferable to use an underwater plasma treatment device that decomposes organic compounds contained in organic liquid radioactive waste in the coagulation sedimentation tank into plasma by generating non-thermal plasma by applying voltage between two electrodes.

[0056] The foreign substances, oil, and sediment separated and collected in the above foreign substance separator (31), oil separator (35), and coagulation sedimentation tank (36) are classified and treated as miscellaneous solid radioactive waste.

[0057]

[0058] Referring to FIGS. 3, 6 and 9, the main treatment unit (40) removes radioactive contaminants contained in liquid radioactive waste transported through the pretreatment unit (30) and separates the exhaust gas containing liquid vapor from which radioactive contaminants have been removed into exhaust gas and discharge liquid, and is composed of a thin film cyclone dryer equipment (41), a first condenser (42), a second condenser (43), and a condensate storage tank (44).

[0059] The above-mentioned thin film cyclone dryer equipment (41) is connected to the oil separator (35) and the organic compound decomposition means (37) of the pretreatment unit (30), respectively, and evaporates low-concentration, high-concentration, and organic liquid radioactive waste transferred from the oil separator (35) and the organic compound decomposition means (37) in a thin film cyclone dryer manner to extract and remove radioactive contaminants in the form of dried powder.

[0060] The first condenser (42) is connected to the centrifugal thin film evaporation drying device (41) and condenses the exhaust gas containing liquid vapor that is evaporated and transported from the centrifugal thin film evaporation drying device (41), discharges the primary condensed liquid separated from the exhaust gas, and exhausts the primary condensed exhaust gas.

[0061] The second condenser (43) is connected to the first condenser (42) and condenses the liquid vapor in the exhaust gas containing the liquid vapor that is condensed and transported from the first condenser (42) by a gas-liquid dual-flow centrifugal separation method, discharges the secondary condensed liquid separated from the exhaust gas, and exhausts the secondary condensed exhaust gas.

[0062] The above condensate storage tank (44) is connected to the first and second condensers (42)(43) respectively and collects and stores the primary and secondary condensates discharged from the first and second condensers (42)(43).

[0063]

[0064] Referring to FIGS. 3, 7 and 9, the post-processing unit (50) purifies the exhaust gas and discharge liquid that are transported through the main processing unit (40), discharges the purified exhaust gas and discharge liquid to the exhaust and drainage system of a building, and is composed of an exhaust gas filtration module (51) and a discharge liquid purification module (52).

[0065] The above exhaust gas filtration module (51) is connected to the second condenser (43) of the main treatment unit (40) and filters the exhaust gas from which liquid vapor has been removed after passing through the second condenser (43), and is composed of a dust collection means (51a), a pre-filter means (51b), a high-performance filter means (51c), and an activated carbon filter means (charcoal filter mean) (51d).

[0066] The dust collection means (51a) is connected to the second condenser (43) of the main processing unit (40) and removes dust contained in the exhaust gas from which liquid vapor has been removed by passing through the second condenser (43). It is preferable to use a cyclone equipment or a dust scrubber that combines a cyclone and a bag filter as the dust collection means (51a).

[0067] The above pre-filter means (51b) is connected in communication with the dust collection means (51a) and removes dust that may be contained in the exhaust gas from which dust has been removed by passing through the dust collection means (51a).

[0068] The high-performance filter means (51c) is connected to the pre-filter means (51b) and removes fine particles that may be contained in the exhaust gas that has passed through the pre-filter means (51b), and it is preferable to use a HEPA filter as the high-performance filter means (51c).

[0069] The above-mentioned activated carbon filter means (51d) is connected to the above-mentioned high-performance filter means (51c) and removes iodine (I) that may be contained in the exhaust gas that has passed through the above-mentioned high-performance filter means (51c).

[0070] The above discharge liquid purification module (52) is connected to the condensate storage tank (44) of the above treatment device (40) and purifies and discharges the condensate transferred from the condensate storage tank (44), and is composed of a first water purification means (52a), a second water purification means (52b), and a purified water storage tank (52c).

[0071] The first water purification means (52a) is connected to the condensate storage tank (44) of the main processing unit (40) to purify the condensate transferred from the condensate storage tank (44) to produce purified water, and it is preferable to use microfiltration (MF) and reverse osmosis (RO) equipment as the first water purification means (52a).

[0072] The second water purification means (52b) is connected to the first water purification means (52a) and removes ionic compounds contained in the purified water transferred from the first water purification means (52a). It is preferable to use a high-efficiency demineralization facility (LRDPS, Liquid Radwaste Demineralization Processing System) that decontaminates radioactivity through cations, anions, and mixed-bed ion exchange resins as the second water purification means (52b).

[0073] The above purified water storage tank (52c) is connected to the above second water purification means (52b) and stores purified water transferred from the above second water purification means (52b) and drains it when necessary.

[0074] The exhaust gas discharged from the exhaust gas filtration module (51) and the purified water discharged from the discharge liquid purification module (52) are monitored for environmental discharge at all times or periodically through various monitoring means.

[0075]

[0076] Referring to FIG. 9, the control panel (60) is connected to various sensing means, driving and opening / closing auxiliary devices of the liquid radioactive waste storage unit (20), pre-treatment unit (30), main treatment unit (40), and post-treatment unit (50), respectively, controls the operation of each auxiliary device, and inputs control commands from an operator.

[0077] That is, the control panel (60) is respectively connected to the first to ninth solenoid valves (21b)(22b)(23b)(33b)(33d)(34b)(34d)(35c)(35d) to supply low-concentration, high-concentration, and organic liquid radioactive waste stored in the low-concentration, high-concentration, and organic liquid radioactive waste storage tanks (21)(22)(23) of the liquid radioactive waste storage unit (20) to the corresponding components of the pretreatment unit (30), and is respectively connected to the first to fourth water level sensors (21c)(22c)(23c)(36f) to supply the first to seventh based on the water level detection signals in the low-concentration, high-concentration, and organic liquid radioactive waste storage tanks (21)(22)(23) and the coagulation sedimentation tank (36). It controls the operation of solenoid valves (21b)(22b)(23b)(33b)(33d)(34b)(34d), and controls the operation of the coagulation sedimentation tank (36) by connecting to the stirring unit (36e), coagulant supply unit (36g), and sediment transport unit (36d), respectively, and controls the operation of each component by connecting to the foreign matter separator (31), oil separator (35) (organic compound decomposition means (37), centrifugal thin film evaporation drying device (41), first and second condensers (42)(43), and dust collection means (51a), respectively, thereby controlling the operation of each component, and simultaneously controls the operation of each component according to an operation command by an operator.

[0078]

[0079] The integrated treatment device for liquid radioactive waste generated during the decommissioning of an operating nuclear power plant and a nuclear power plant subject to decommissioning according to the present invention, having the configuration as described above, classifies liquid radioactive waste of various properties and conditions generated during the decommissioning of an operating nuclear power plant and a nuclear power plant subject to decommissioning into low-concentration, high-concentration, and organic liquid radioactive waste, and performs pretreatment and main treatment processes suitable for the properties and conditions of each liquid radioactive waste to remove radioactive contaminants contained in each liquid radioactive waste, and sequentially performs a post-treatment process to purify the exhaust gas and discharge liquid generated during the main treatment process, thereby significantly improving the treatment efficiency of liquid radioactive waste and reducing treatment costs, as well as significantly reducing the amount of secondary radioactive waste, such as radioactive waste generated during the treatment process of liquid radioactive waste and radioactive waste resin, which are the results of the treatment of liquid radioactive waste.

[0080]

[0081] As such, parties to the art to which the present invention pertains will understand that the technical configuration of the present invention described above may be implemented in other specific forms without altering the technical concept or essential features of the present invention.

[0082] Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting, and the scope of the invention is defined by the claims set forth below rather than by the detailed description above, and all modifications or variations derived from the meaning and scope of the claims and equivalent concepts thereof should be interpreted as being included within the scope of the invention.

[0083]

[0084] The present invention has the potential to be applied to constructing an integrated treatment system for liquid radioactive waste generated during the decommissioning of a nuclear power plant, which can significantly improve the treatment efficiency of liquid radioactive waste and reduce treatment costs, as well as significantly reduce the amount of secondary radioactive waste generated, such as radioactive waste resin, by classifying the liquid radioactive waste generated during the decommissioning of a nuclear power plant into low-concentration, high-concentration, and organic liquid radioactive waste by a liquid radioactive waste storage unit, performing a suitable pretreatment process according to the properties and conditions of each liquid radioactive waste by a pretreatment unit, removing radioactive contaminants contained in the liquid radioactive waste for which the low-concentration treatment process is completed through the pretreatment unit by a main treatment unit, and sequentially performing a post-treatment process to purify the exhaust gas and discharge liquid generated through the main treatment unit by a post-treatment unit, and then discharging the purified exhaust gas and purified water.

Claims

1. A liquid radioactive waste sorting and storage step (S100) in which liquid radioactive waste generated during the decommissioning of a nuclear power plant is classified into low-concentration liquid radioactive waste, high-concentration liquid radioactive waste, and organic liquid radioactive waste and stored in respective storage tanks; a pretreatment step (S200) in which, in the liquid radioactive waste sorting and storage step, foreign substances, oil, impurities, precipitates, and solids contained in the liquid radioactive waste stored in each storage tank are separated and collected, and organic matter is decomposed; and a main treatment step (S300) in which radioactive contaminants contained in the liquid radioactive waste that has passed through the pretreatment step (S200) are removed, the condensate from which radioactive contaminants have been removed is separated into gas and liquid, and exhaust gas and discharge liquid are generated; In an integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant for implementing an integrated treatment method for liquid radioactive waste generated during the decommissioning of a nuclear power plant, the device comprises a post-treatment step (S400) for purifying the exhaust gas and discharge liquid that are separated and discharged in the above main treatment step (S300) and discharging the purified exhaust gas and discharge liquid to the exhaust and drainage system of a building, The above processing device is, A liquid radioactive waste storage unit (20) composed of multiple storage tanks (21)(22)(23) that separately store low-concentration, high-concentration, and organic liquid radioactive waste and discharge the stored liquid radioactive waste when necessary; A pretreatment unit (30) that is connected to the discharge port of each storage tank (21)(22)(23) of the liquid radioactive waste storage unit (20) and separates and collects foreign substances, oil, impurities, precipitates, and solids contained in low-concentration, high-concentration, and organic liquid radioactive waste transferred from each storage tank (21)(22)(23), decomposes organic compounds contained in organic liquid radioactive waste, classifies and processes the separated foreign substances, oil, impurities, precipitates, and solids as miscellaneous solid radioactive waste, and decomposes organic compounds contained in organic liquid radioactive waste; A main treatment unit (40) that removes radioactive contaminants contained in liquid radioactive waste transported through the above pretreatment unit (30) and separates the exhaust gas containing liquid vapor from which radioactive contaminants have been removed into exhaust gas and discharge liquid; A post-treatment unit (50) that purifies the exhaust gas and discharge liquid transported through the above-mentioned main treatment unit (40) and discharges the purified exhaust gas and discharge liquid to the exhaust and drainage system of a building; An integrated processing device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being composed of a control panel (60) that is connected to various sensing means, driving and opening / closing auxiliary devices of the liquid radioactive waste storage unit (20), pre-processing unit (30), main processing unit (40), and post-processing unit (50), controls the operation of each auxiliary device, and inputs control commands from a worker.

2. In Paragraph 1, The above preprocessing unit (30) is, A foreign substance separator (31) for separating and removing foreign substances contained in liquid radioactive waste, equipped with an inlet (31a) into which liquid radioactive waste is introduced, liquid radioactive waste discharge outlets (31b) (31c) from which foreign substances have been removed, and a foreign substance discharge outlet (31d) for discharging foreign substances separated from the liquid radioactive waste; A low-concentration liquid radioactive waste supply pipe (32) that is a connecting pipe equipped with a first pumping means (32a), which connects the outlet (21a) of the low-concentration liquid radioactive waste storage tank (21) of the liquid radioactive waste storage unit (20) to the inlet (31a) of the foreign substance separator (31) and pumps the low-concentration liquid radioactive waste stored in the low-concentration liquid radioactive waste storage tank (21) by the first pumping means (32a) and supplies it to the foreign substance separator (31); A connecting pipe comprising a second pumping means (33a), a fourth solenoid valve (33b) for opening and closing a flow path, a branch pipe (33c) branching in the section between the second pumping means (33a) and the fourth solenoid valve (33b), and a fifth solenoid valve (33d) mounted on the branch pipe (33c) for opening and closing the branch pipe, wherein the discharge port (22a) of the high-concentration liquid radioactive waste storage tank (22) of the liquid radioactive waste storage unit (20) and the inlet port (31a) of the foreign substance separator (31) are connected in communication, and the high-concentration liquid radioactive waste stored in the high-concentration liquid radioactive waste storage tank (22) is pumped by the second pumping means (33a) and supplied to the foreign substance separator (31); An organic liquid radioactive waste supply pipe (34) having a third pumping means (34a), a sixth solenoid valve (34b) for opening and closing a flow path, a branch pipe (34c) branching in the section between the third pumping means (34a) and the sixth solenoid valve (34b), and a seventh solenoid valve (34d) mounted on the branch pipe (34c) for opening and closing the branch pipe (34c), wherein the discharge port (23a) of the organic liquid radioactive waste storage tank (23) of the liquid radioactive waste storage unit (20) and the inlet port (31a) of the foreign substance separator (31) are connected in communication, and the organic liquid radioactive waste stored in the organic liquid radioactive waste storage tank (23) is pumped by the third pumping means (34a) and supplied to the foreign substance separator (31); An inlet (35a) into which liquid radioactive waste is introduced, two formed liquid radioactive waste outlets (35b-1) (34b-2) into which oil-removed liquid radioactive waste is discharged, eighth and ninth solenoid valves (35c) (35d) respectively mounted on the liquid radioactive waste outlets (35b-1) (35b-2) and opening and closing each liquid radioactive waste outlet (35b-1) (35b-2), and an oil outlet (35e) for discharging oil separated from the liquid radioactive waste; wherein the inlet (35a) is connected to the liquid radioactive waste outlet (31b) of the foreign substance separator (31) by a connecting pipe, and an oil separator (35) for separating and removing oil contained in the liquid radioactive waste introduced from the foreign substance separator (31); A coagulation sedimentation tank (36) that coagulates and settles high-concentration and organic liquid radioactive waste flowing in from the high-concentration and organic liquid radioactive waste storage tanks (33) (34) of the liquid radioactive waste supply pipe (33) and organic liquid radioactive waste supply pipe (34), and is respectively connected to the branch pipes (33c) (34c) of the high-concentration and organic liquid radioactive waste supply pipe (33) (34) of the liquid radioactive waste storage unit (20) or high-concentration and organic liquid radioactive waste from which foreign substances and oil have been removed flowing in from the oil separator (35); It is composed of an organic compound decomposition means (37) that decomposes organic compounds contained in organic liquid radioactive waste stored in the above-mentioned coagulation sedimentation tank (36); An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized in that foreign substances, oil, and sediment separated and collected in the above foreign substance separator (31), oil separator (35), and coagulation sedimentation tank (36) are classified and treated as miscellaneous solid radioactive waste.

3. In Paragraph 2, The above organic compound decomposition means (37) is, An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being an underwater plasma treatment device that generates non-thermal plasma by applying voltage between two electrodes to decompose organic compounds contained in organic liquid radioactive waste within a coagulation sedimentation tank using plasma.

4. In Paragraph 2, The above coagulation sedimentation tank (36) is, A tank having an inlet (36a) into which liquid radioactive waste is introduced, a liquid radioactive waste outlet (36b) for discharging liquid radioactive waste in which the precipitation reaction is completed by a coagulation and precipitation process, and a precipitate outlet (36c) for discharging precipitate; A sediment transport unit (36d) that transports sediment settled on the bottom surface toward the sediment discharge port (36c), and A stirring unit (36e) for mixing liquid radioactive waste, and A fourth water level detection means (36f) that detects the water level and transmits the water level detection signal, and An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by having a coagulant supply unit (36g) for supplying a coagulant to the incoming liquid radioactive waste.

5. In Paragraph 1, The above main processing unit (40) is, A thin film cyclone dryer equipment (41) that is connected to the oil separator (35) and the organic compound decomposition means (37) of the pretreatment unit (30) and evaporates low-concentration, high-concentration, and organic liquid radioactive waste transferred from the oil separator (35) and the organic compound decomposition means (37) in a centrifugal thin film cyclone dryer method to extract and remove radioactive contaminants in the form of dried powder; A first condenser (42) connected in communication with the above centrifugal thin film evaporation drying device (41), which first condenses the exhaust gas containing liquid vapor evaporated and transported from the above centrifugal thin film evaporation drying device (41), discharges the first condensed liquid separated from the exhaust gas, and exhausts the first condensed exhaust gas; A second condenser (43) connected in communication with the first condenser (42), which secondarily condenses the liquid vapor in the exhaust gas containing liquid vapor that is first condensed and transferred from the first condenser (42) using a gas-liquid dual-flow centrifugal separation method, discharges the second condensed liquid separated from the exhaust gas, and exhausts the secondarily condensed exhaust gas; An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being composed of a condensate storage tank (44) that is connected to the first and second condensers (42) (43) respectively and collects and stores the primary and secondary condensates discharged from the first and second condensers (42) (43).

6. In Paragraph 1, The above post-processing unit (50) An exhaust gas filtration module (51) connected to the second condenser (43) of the main processing unit (40) to filter the exhaust gas from which liquid vapor has been removed after passing through the second condenser (43) and then exhausting it; It is composed of a discharge liquid purification module (52) that is connected in communication with the condensate storage tank (44) of the above-mentioned main processor (40) and purifies and discharges the condensate transferred from the condensate storage tank (44); An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by performing environmental discharge monitoring on the exhaust gas exhausted from the exhaust gas filtration module (51) and the purified water discharged from the discharge liquid purification module (52) at all times or periodically through various monitoring means.

7. In Paragraph 6, The above exhaust gas filtration module (51) is, A dust collection means (51a) connected to the second condenser (43) of the main processing unit (40) to remove dust contained in the exhaust gas from which liquid vapor has been removed after passing through the second condenser (43); A pre-filter means (51b) connected in communication with the dust collection means (51a) and removing dust that may be contained in the exhaust gas from which dust has been removed by passing through the dust collection means (51a); A high-performance filter means (51c) connected in communication with the above-mentioned pre-filter means (51b) and removing fine particles that may be contained in the exhaust gas that has passed through the above-mentioned pre-filter means (51b); An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being composed of an activated carbon filter means (51d) that is connected in communication with the high-performance filter means (51c) and removes iodine (I) that may be contained in the exhaust gas that has passed through the high-performance filter means (51c).

8. In Paragraph 6, The above condensate purification module (52) is, A first water purification means (52a) that is connected to the condensate storage tank (44) of the main processing unit (40) and purifies the condensate transferred from the condensate storage tank (44) to produce purified water; A second water purification means (52b) connected in communication with the first water purification means (52a) and removing ionic compounds contained in purified water transferred from the first water purification means (52a); An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being composed of a purified water storage tank (52c) that is connected to the second water purification means (52b) and stores purified water transferred from the second water purification means (52b) and drains it when necessary.

9. In Paragraph 1, The above liquid radioactive waste storage unit (20) is, A storage tank having an outlet (21a) formed on the lower side, a first solenoid valve (21b) mounted on the outlet (21a) to open and close the outlet (21a), and a first water level sensor (21c) mounted on the inner side to detect the water level and transmit the detection signal, and a low-concentration liquid radioactive waste storage tank (21) for temporarily storing low-concentration liquid radioactive waste inside; A storage tank having an outlet (22a) formed on the lower side, a second solenoid valve (22b) mounted on the outlet (22a) to open and close the outlet (22a), and a second water level sensor (22c) mounted on the inner side to detect the water level and transmit the detection signal, and a high-concentration liquid radioactive waste storage tank (22) for temporarily storing high-concentration liquid radioactive waste inside; An integrated processing device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being composed of an organic liquid radioactive waste storage tank (23) having a discharge port (23a) formed on the lower side, a third solenoid valve (23b) mounted on the discharge port (23a) to open and close the discharge port (23a), and a third water level sensor (23c) mounted on the inner side to detect the water level and transmit the detection signal, and having an organic liquid radioactive waste storage tank (23) for temporarily storing organic liquid radioactive waste inside.

10. In Paragraph 7, The above dust collection means (51a) is, An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being a cyclone device combining a cyclone and a bag filter.

11. In Paragraph 7, The above dust collection means (51a) is, An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being a dust scrubber.

12. In Paragraph 7, The above high-performance filter (51c) is, An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being a HEPA filter.

13. In Paragraph 8, The above first water purification means (52a) is, An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being a microfiltration (MF) and reverse osmosis (RO) device.

14. In Paragraph 8, The above second water purification means (52b) is, An integrated treatment device for liquid radioactive waste generated during the decommissioning of a nuclear power plant, characterized by being a high-efficiency Liquid Radiowaste Demineralization Processing System (LRDPS) that decontaminates radioactivity through cations, anions, and mixed-bed ion-exchange resins.

Images