JP2010223739A - Execution method and system related to treatment of waste liquid containing rust inhibitor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for both rationally and economically executing the purifying and defusing treatment of radioactive waste liquid containing a rust inhibitor such as suppression pool water and the removal of radioactive corrosion products adhering to reactor core internals and a system related to the method in the decommission and large-scaled repair work of a reactor. <P>SOLUTION: The sharing of the devices and equipment used in each of the following processes is achieved when the processes are executed one by one in much the same period; wherein the processes are the following: the chemical decontamination treatment process in a nuclear power plant by a chemical decontamination treatment system 11 in the nuclear power plant that removes the radioactive corrosion products adhering to structures contacted by a fluid containing radioactive materials in the nuclear power plant; the suppression pool water purification process by a suppression pool water purification system 12 for purifying the suppression pool water through the filtration treatment of insoluble impurities in the suppression pool water stored in a pressure suppression chamber 18 of a reactor containment vessel; and the process for treating the waste liquid containing the rust inhibitor by a system 13 for giving a decomposition treatment to the rust inhibitor contained in the radioactive waste liquid to defuse. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention contains a rust inhibitor that performs a chemical decontamination process in a nuclear power plant, a suppression pool water purification process, and a rust inhibitor-containing waste liquid treatment process at substantially the same time in nuclear decommissioning or large-scale repair work, etc. The present invention relates to a waste liquid treatment-related construction method and a rust inhibitor-containing waste liquid treatment-related system.

  Anticorrosives are widely used as rust prevention and anticorrosion techniques for constituent metals such as storage tanks and piping equipment in various plants such as nuclear power, steel, oil, gas, and chemicals. This anticorrosive agent has an organic rust inhibitor and an inorganic rust preventive agent, the organic rust preventive agent is an organic carboxylic acid, an azonal organic compound, etc., and the inorganic rust preventive agent is a chromate (for example, potassium chromate). It has been known.

  In particular, water (suppression pool water) is always stored in the pressure suppression chamber (suppression chamber), which is responsible for the pressure control function of the containment vessel in nuclear power plants, due to steam condensation in the event of a loss of coolant. The inner surface of this pressure suppression chamber is painted, but it is in an underwater or humid environment. For this reason, if the paint is peeled off, partial corrosion or pitting corrosion may occur. Therefore, an anticorrosive agent (mixture of organic anticorrosive and inorganic anticorrosive) is added to the suppression pool water. There is a nuclear power plant that is under management.

  When disposing of such suppression pool water, it must be treated appropriately due to the presence of radioactive substances, and solidified waste suitable for final disposal must be obtained. However, radioactive waste liquids under conditions where organic and inorganic anticorrosives are mixed may affect the soundness of solidified bodies and buried facilities. Is required. A processing method that solves this problem is disclosed in Patent Document 1. In this treatment method, organic rust inhibitor is decomposed with ozone gas, and inorganic rust inhibitor containing hexavalent chromium is adjusted to acidic by adding formic acid, and then hydrogen peroxide is added to convert hexavalent chromium into 3 It is detoxified by reducing it to valent chromium.

  By the way, an example of treating the entire amount of suppression pool water containing a rust preventive agent occurs at the time of repair work or decommissioning of the nuclear reactor containment vessel. There is a method described in Patent Document 2 for a basic system for purifying pool water with a temporary facility. In addition, there is already in-reactor chemical decontamination technology for removing radioactive corrosion products adhering to and depositing on the surface of reactor internal structures during reactor decommissioning and in-shroud repair work, etc. . Regarding this chemical decontamination technique, Patent Document 3 discloses an in-reactor chemical decontamination technique in which ozone gas is injected.

JP-A-2005-326361 JP 2000-111163 A JP 2007-232531 A

When processing a large amount of radioactive liquid waste containing rust preventives, such as suppression pool water in an actual nuclear power plant, it is integrated harmless to decompose organic rust preventives and reduce inorganic rust preventives containing hexavalent chromium. However, a construction method for rationally and economically treating a waste liquid of 1500 m ³ or more has not been established.

  Furthermore, the retained water in the actual nuclear power plant contains a lot of insoluble impurities, and this impurity hinders the decomposition efficiency (speed) when detoxifying the retained water. Therefore, a rationalization processing system that also serves as a purification process is desired.

  In addition, specific technologies suitable for each purpose are applied during decommissioning of nuclear reactors and large-scale repair work. Most of the individual specific technologies related to radioactive waste liquid treatment and decontamination are sharable devices and equipment. Accounted for. Depending on the ingenuity of the local construction, a rational and economical processing system is required by effectively using shared equipment and equipment.

  The object of the present invention has been made in view of the above circumstances, and in the decommissioning of nuclear reactors and large-scale repair work, purification and detoxification of radioactive liquid waste containing rust preventives such as suppression pool water, Another object of the present invention is to provide an anticorrosive-containing waste liquid treatment-related construction method and related system capable of rationally and economically removing radioactive corrosion products adhering to a reactor internal structure or the like.

  The construction method related to waste liquid treatment containing a rust inhibitor according to the present invention includes a chemical decontamination treatment process in a nuclear power plant that removes radioactive corrosion products adhering to a structure in contact with a fluid containing a radioactive substance in a nuclear power plant, and a reactor storage Suppression pool water purification process that purifies the pool water by filtering insoluble impurities in the suppression pool water stored in the pressure suppression chamber of the container, and decomposing the rust inhibitor contained in the radioactive liquid waste When the rust preventive agent-containing waste liquid treatment process that is rendered harmless is sequentially carried out at substantially the same time, the apparatus / equipment used in each of the processes is shared.

  Further, the rust preventive-containing waste liquid treatment related system according to the present invention is a nuclear power plant that performs a chemical decontamination process in a nuclear power plant that removes radioactive corrosion products attached to a structure in contact with a fluid containing a radioactive material in the nuclear power plant. In-plant chemical decontamination system, and a suppression pool water purification process for purifying the pool water by filtering insoluble impurities in suppression pool water stored in the pressure suppression chamber of the reactor containment vessel A pool water purification treatment system, and a rust inhibitor-containing waste liquid treatment system for performing a rust inhibitor-containing waste liquid treatment step for detoxifying and detoxifying the rust inhibitor contained in the radioactive waste liquid, the nuclear power plant The internal chemical decontamination process, the suppression pool water purification process, and the anti-rust agent-containing waste liquid treatment process are in the same order. If implemented, apparatus and equipment used in each processing system is characterized in that it has been configured by shared.

  According to the rust preventive-containing waste liquid treatment related construction method and related system according to the present invention, in the decommissioning of nuclear reactors and large-scale repair work, purification and detoxification treatment of radioactive waste liquid containing rust preventives such as suppression pool water In addition, the removal of radioactive corrosion products adhering to the reactor internal structure and the like can be carried out rationally and economically by sharing the apparatus and equipment used in each process.

The block diagram which shows one Embodiment of the rust preventive containing waste liquid processing related system which concerns on this invention. The system diagram which shows the chemical decontamination processing system in the nuclear power plant of FIG. 1 with a part of nuclear reactor pressure vessel. The longitudinal cross-sectional view which shows the ultraviolet irradiation device (FIG. 3 (A)) in FIG. 1 with the conventional ultraviolet irradiation device (FIG. 3 (B)). FIG. 3 is a schematic system diagram showing a case where a plurality of ejectors of FIG. 2 are installed. The systematic diagram which shows the suppression pool water purification processing system of FIG. The systematic diagram which shows the rust preventive containing waste liquid processing system of FIG.

  The best mode for carrying out the present invention will be described below with reference to the drawings. However, the present invention is not limited to these embodiments.

  FIG. 1 is a configuration diagram showing an embodiment of a rust preventive-containing waste liquid treatment related system according to the present invention. The rust inhibitor-containing waste liquid treatment-related system 10 includes a nuclear plant chemical decontamination treatment system 11 that performs a nuclear plant chemical decontamination treatment step, and a suppression pool water purification treatment system 12 that implements a suppression pool water purification treatment step. And a rust inhibitor-containing waste liquid treatment system 13 for carrying out a rust inhibitor-containing waste liquid treatment process.

  The nuclear plant chemical decontamination process includes a reactor pressure vessel 14 (FIG. 2), a reactor internal structure (core shroud 15, core support plate 16, upper lattice plate (not shown)), reactor recirculation system 17. In some cases, such as a main steam pipe, a feed water pipe, etc., a process of removing radioactive corrosion products adhering to a structure in contact with a fluid containing a radioactive substance such as reactor water in a nuclear power plant including a primary reactor system. In addition, the suppression pool water purification treatment step is performed by filtering insoluble impurities in the suppression pool water 19 stored in the pressure suppression chamber 18 (suppression chamber; FIG. 5) of the reactor containment vessel to suppress the suppression pool water. 19 is a process of purifying 19. Further, the rust preventive agent-containing waste liquid treatment step is a step for detoxifying the organic and inorganic rust preventive agents contained in the radioactive waste liquid.

  The anticorrosive-containing waste liquid treatment-related construction method is to carry out the chemical decontamination process in the nuclear power plant, the suppression pool water purification process, and the anti-rust agent-containing waste liquid treatment process in sequence at the same time. In reactor decommissioning and large-scale repair work, etc., mainly for the purpose of reducing the exposure of construction workers, purification and detoxification of radioactive liquid waste containing rust preventives such as suppression pool water 19 and Remove adhering radioactive corrosion products.

  Hereinafter, each system of the chemical decontamination processing system 11 in the nuclear power plant, the suppression pool water purification processing system 12, and the rust preventive-containing waste liquid processing system 13 will be described, but the devices and equipment used in these systems are shared. Has been.

[A] Chemical decontamination processing system in a nuclear power plant (FIGS. 1 to 4)
As shown in FIG. 1, a chemical decontamination processing system 11 in a nuclear power plant includes a decontamination liquid circulation line 21 including a circulation pump 20 that circulates cooling water or decontamination liquid in a reactor pressure vessel 14, and the decontamination liquid circulation line 21. Measuring instrument 22, electric heater 23, system cooler (condenser) 24, desalter 25, chemical solution injector 26, hydrogen peroxide solution injector 27, and ultraviolet irradiation device 28 arranged sequentially in the dye solution circulation line 21. And an ozone gas generator 29 and an ejector 30 as ozone gas supply means.

  Here, the ejector 30 as an ozone gas mixer is used when mixing ozone gas into the treatment liquid which is a waste liquid in a rust preventive agent-containing waste liquid treatment process which is a subsequent process. In the decontamination process, it is used when ozone gas from the ozone gas generator 29 is mixed in the circulating cooling water or decontamination liquid. In addition, the measuring instrument 22, the electric heater 23, the system cooler 24, the desalinator 25, the chemical solution injector 26, the hydrogen peroxide solution injector 27, the ultraviolet irradiation device 28, the ozone gas generator 29, and the ejector 30 are chemically removed. The dyeing equipment 31 (FIG. 2) is configured.

  The nuclear plant chemical decontamination processing system 11 includes, for example, a reduction decontamination process using oxalic acid as a reducing agent, a reducing agent decomposition process for decomposing this oxalic acid, and an oxidative decontamination process using, for example, ozone as an oxidizing agent. , Repeatedly in sequence.

  In the reduction decontamination step, oxalic acid is injected from the chemical solution injection device 26 into the decontamination liquid circulation line 21 to make cooling water into the decontamination liquid, and this decontamination liquid is heated to about 95 ° C. by the electric heater 23, By circulating a decontamination liquid or cooling water between the reactor pressure vessel 14 and the chemical decontamination equipment 31 via the decontamination liquid circulation line 21, the reactor pressure vessel 14, the reactor internal structure (core shroud 15 The iron oxide containing radionuclide (iron oxide film) adhering to the core support plate 16 and the reactor recirculation system 17 is dissolved, and the dissolved iron ions are removed by the desalter 25. In this reductive decontamination process, the same applies to the subsequent reducing agent decomposition process and oxidative decontamination process, but the reactor recirculation pump 17 (FIG. 2) is activated to operate the reactor recirculation system 17. And improving the decontamination efficiency.

  In the next reducing agent decomposition step, as shown in FIG. 1, hydrogen peroxide solution is injected from the hydrogen peroxide solution injection device 27 into the decontamination solution circulation line 21, and oxalic acid in the decontamination solution is converted into carbon dioxide. Oxidizes to water. After the decomposition of oxalic acid, if hydrogen peroxide solution remains in the decontamination solution, the residual hydrogen peroxide solution is decomposed into oxygen and water by irradiating ultraviolet rays from the ultraviolet irradiation device 28.

  In the next oxidative decontamination step using ozone, ozone gas generated by the ozone gas generator 29 is mixed into cooling water or decontamination liquid as will be described later using the ejector 30, and this decontamination liquid is mixed by the system cooler 24 for about 80%. It is cooled to 0 ° C. and circulated through the decontamination liquid circulation line 21 between the reactor pressure vessel 14 and the chemical decontamination equipment 31. As a result, the chromium oxide (oxidized film having a high chromium content) containing the radionuclide adhering to the reactor pressure vessel 14, the reactor internal structure, the reactor recirculation system 17, and the like was dissolved and dissolved. Chromium ions and the like are removed by a desalter 25.

  The exhaust gas generated in the reactor pressure vessel 14 in the reduction decontamination step, the reducing agent decomposition step, and the oxidative decontamination step is cooled by the vent cooler 33, and the steam becomes water 33a to become the reactor pressure vessel 14 inside. When the blower 34 </ b> A is operated, harmful components are adsorbed and removed by the exhaust gas treatment device 34, and then guided to the building ventilation air conditioning system 35.

  Here, as shown in FIG. 3A, the ultraviolet irradiation device 28 is configured by arranging a plurality of (for example, three) ultraviolet irradiation lamps 37 in parallel in a cylindrical can body 36. In the can 36, the decontamination liquid flows in the chemical decontamination process in the nuclear power plant, the suppression pool water flows in the suppression pool water purification process, and the waste liquid (treatment liquid) flows in the rust inhibitor-containing waste liquid treatment process. In addition, the code | symbol 76 in FIG. 3 shows a strainer.

  That is, as shown in FIG. 3B, the conventional ultraviolet irradiation device 38 has a one-lamp module structure in which one ultraviolet irradiation lamp 37 is arranged on the can 36. In the present embodiment, This is a three-lamp module structure in which three ultraviolet irradiation lamps 37 are arranged in parallel on the can 36. In the conventional ultraviolet irradiation device 38, in order to improve the effect of ultraviolet rays, the ultraviolet irradiation device 38 is required by the number of the ultraviolet irradiation lamps 37, and it is difficult to reduce the size of the device for unitization. is there. On the other hand, the ultraviolet irradiation device 28 having a three-lamp module structure can be downsized, and is very effective in a nuclear power plant in which equipment installation space cannot be secured. Furthermore, since the intensity of the ultraviolet irradiation light in the ultraviolet irradiation device 28 is remarkably improved, the decomposition efficiency by the ultraviolet rays per one ultraviolet irradiation device 28 is improved.

  As shown in FIGS. 1 and 2, an ejector 30 as an ozone gas mixer that mixes ozone gas from the ozone gas generator 29 into cooling water or decontamination liquid is an atom having a structure that does not particularly have a jet pump inside. Used for injecting ozone gas into the furnace pressure vessel 14. In the decontamination liquid circulation line 21 for circulating cooling water or decontamination liquid between the reactor pressure vessel 14 and the chemical decontamination equipment 31, a CRD housing (in-core housing) provided at the bottom of the reactor pressure vessel 14 is used. Hose 40 is connected to each of 39, and collective headers 41 (core header 41 </ b> A corresponding to the outermost core of the core, collective header 41 </ b> B corresponding to the center of the core) installed corresponding to the cell arrangement of the core. And the circulation pump 20 of the decontamination liquid circulation line 21 is connected to these collective headers 41.

  An ozone gas extraction line 43 in which the ozone gas extraction pump 42 and the ejector 30 are disposed is connected between the downstream side of the circulation pump 20 of the decontamination liquid circulation line 21 and the collective header 41A corresponding to the outermost periphery of the core. The ozone gas extraction pump 42 supplies high pressure water to the ejector 30. The ejector 30 generates negative pressure by the flow of high-pressure water from the ozone gas extraction pump 42, sucks ozone gas from the ozone gas generator 29, and injects ozone gas into the cooling water or decontamination liquid flowing through the ozone gas extraction line 43. And mix.

  In the decontamination liquid circulation line 21, stop valves 44A and 44B are disposed upstream and downstream of the circulation pump 20, and in the ozone gas extraction pump 42, stop valves 45A and 45B are provided upstream and downstream of the ozone gas extraction pump 42. Is disposed. The stop valves 44A and 44B are opened when the circulating pump 20 is operating, and are closed when stopped. The stop valves 45A and 45B are opened when the ozone gas extraction pump 42 is operated, and are closed when the ozone gas bleed pump 42 is stopped.

  Therefore, paying attention to the ozone gas bleed line 43, the ozone gas bleed pump 42 and the circulation pump 20 are directly connected to each other, and can be operated simultaneously. When the ozone gas extraction pump 42 and the circulation pump 20 are operated simultaneously, the supply water pressure to the ejector 30 is increased, and the ozone gas suction efficiency of the ejector 30 is improved. Therefore, compared with the case where the ozone gas extraction pump 42 is operated alone. As a result, the differential pressure at the inlet / outlet portion of the ejector 30 increases, and the amount of ozone gas sucked by the ejector 30 increases.

  In the decontamination liquid circulation line 21 and the ozone gas extraction line 43, switching valves 46A and 46B are arranged at positions sandwiching the core outermost corresponding collective header 41A. These switching valves 46A and 46B are closed when the ejector 30 does not mix ozone gas (that is, during the reduction decontamination process and the reducing agent decomposition process in the chemical decontamination process in the nuclear power plant). Then, the switching valve 46B is opened. At this time, the ozone gas extraction pump 42 is stopped, the stop valves 45A and 45B are closed, and the stop valves 44A and 44B are opened, so that the circulation pump 20 is in an operating state. Therefore, by operating the circulation pump 20, the CRD housing 39 and all the collective headers 41 from all the CRD housing stub tubes (the stub tube 47A corresponding to the outermost periphery of the core and the stub tube 47B corresponding to the center of the core) at the bottom of the reactor pressure vessel 14 are obtained. The cooling water or the decontamination liquid in the reactor pressure vessel 14 enters the decontamination liquid circulation line 21 as shown by an arrow α in FIG. 2 (through the core outermost peripheral correspondence header 41A and the core center correspondence header 41B). Inhaled.

  The switching valves 46A and 46B are opened when the ejector 30 is mixed with ozone gas (at the time of the oxidative decontamination process in the nuclear plant chemical decontamination process), and the switching valve 46B is closed. The At this time, the stop valves 44A and 44B are opened and the circulation pump 20 is in an operating state, and the stop valves 45A and 45B are opened and the ozone gas extraction pump 42 is in an operating state. Therefore, by the operation of the circulation pump 20 and the ozone gas extraction pump 42, the reactor core from the core center corresponding stub tube 47B at the bottom of the reactor pressure vessel 14 passes through the corresponding CRD housing 39 and core center corresponding collective header 41B, etc. Cooling water or decontamination liquid in the pressure vessel 14 is drawn into the decontamination liquid circulation line 21, and a part of this cooling water or decontamination liquid flows into the ozone gas extraction line 43, and ejects the cooling water or decontamination liquid into the ejector. From 30 ozone gas is mixed. The cooling water or the decontamination liquid mixed with the ozone gas passes through the core outermost periphery corresponding header 41A and the corresponding CRD housing 39 as shown by the arrow β in FIG. It is introduced into the container 14.

  At the time of the chemical decontamination process in the nuclear power plant, the reactor recirculation pump 32 is also activated to perform the stirring in the reactor. In general, in a reactor pressure vessel 14 without a jet pump, the coolant introduced into the reactor pressure vessel 14 from the recirculation inlet nozzle 48 at the lower end of the reactor pressure vessel 14 passes through the lower part of the reactor core. The flow distribution is adjusted and rises, and then flows out of the recirculation outlet nozzle 49. Cooling water or decontamination liquid containing ozone gas introduced from the stub tube 47A corresponding to the outermost periphery of the core is uniformly dispersed by the reactor water (cooling water) whose distribution is adjusted. Since the reactor water (cooling water) flows upward even at a relatively short distance, ozone bubbles collide with the inner wall surface of the core shroud 15 in the middle of the reactor pressure vessel 14 on the outermost periphery of the reactor pressure vessel 14. The impact force has an effect of peeling off the clad (oxide film) attached to the core shroud 15.

  Depending on the size of the reactor pressure vessel 14, the amount of ozone gas required in the oxidative decontamination process increases. In this case, as shown in FIG. 4, a plurality of ejectors 30 are arranged in parallel so that the amount of ozone gas mixed in the cooling water or the decontamination liquid can be increased.

  If the ejector 30 is designed to be shared with the rust preventive-containing waste liquid treatment system 13, about one of the ejectors 30 is insufficient in the amount of ozone gas during the oxidative decontamination process using ozone. For this reason, when ozone gas is injected into the reactor pressure vessel 14, a plurality of ejectors 30 having the same specifications are arranged in parallel according to the required amount of ozone gas, and these ejectors 30 generate ozone gas via the ozone gas header 50. By being connected to the device 29, the amount of ozone gas suction can be increased by the addition.

[B] Suppression pool water purification system (FIGS. 1 and 5)
As shown in FIG. 5, the suppression pool water purification treatment system 12 adheres to the bottom wall surface of the pressure suppression chamber 18 at the same time as the suppression pool water 19 using a suction jig 51, a drain pump 52, a submersible pump 53, and the like. Basically, the accumulated insoluble impurities are sucked up and filtered. This configuration originally has a filter 54 equipped with a filter medium such as a hollow fiber membrane that captures and removes insoluble components, an activated carbon adsorption tower 55 that adsorbs and removes TOC (total organic carbon) components, and adsorbs impurity ion components. A desalter 56 filled with the ion exchange resin to be removed, a sample tank 57 for confirming the quality of the purified water, and a transfer pump 58 for transferring the purified water to a destination where the suppression pool water is received. However, in the suppression pool water purification processing system 12 of the present embodiment, the activated carbon adsorption tower 55 and the demineralizer 56 are deleted for reasons described later.

  Further, the suppression pool water purification treatment system 12 includes an ultraviolet irradiation device 28, an electric heater 23, a system cooler (condenser) 24, a circulation pump, which are devices and equipment constituting the chemical decontamination treatment system 11 in the nuclear power plant. 20. By adding the blower 34A, the apparatus / equipment is shared with the chemical decontamination processing system 11 in the nuclear power plant that is carried out substantially at the same time, and further, with the rust preventive-containing waste liquid processing system 13. The functions are streamlined between them.

  The ultraviolet irradiation device 28 is a common device with the chemical decontamination treatment system 11 in the nuclear power plant, and in the suppression pool water purification treatment step, heavy metal ions in the suppression pool water 19 are used as precipitation precipitates, and organic substances are oxidatively decomposed. Used when. The electric heater 23 and the system cooler 24 are devices shared with the chemical decontamination treatment system 11 in the nuclear power plant, and are used when the suppression pool water 19 is concentrated and reduced in the suppression pool water purification treatment step. The

  Here, the reason why the activated carbon adsorption tower 55 and the demineralizer 56 are omitted will be described. That is, the rust inhibitor-containing waste liquid treatment system 13 in the next step decomposes an organic rust inhibitor classified as TOC (total organic carbon) with ozone gas, and reduces hexavalent chromium, which is an inorganic rust inhibitor, to trivalent chromium. This is a detoxification treatment process in which impurity ions are removed by passing these waste liquids through a desalter 25 equipped with an ion exchange resin. Therefore, the removal of the TOC component and impurity ions that have been performed in the suppression pool water purification treatment process including the decontamination in the pressure suppression chamber 18 may be performed in the rust preventive-containing waste liquid treatment process in the next process. The activated carbon adsorption tower 55 and the demineralizer 56 in the suppression pool water purification processing system 12 can be eliminated. As a result, it is possible to construct a rational system that is functionally separated by the suppression pool water purification treatment system 12 and the rust inhibitor-containing waste liquid treatment system 13.

  From the above, the suppression pool water purification processing system 12 according to the present embodiment, as shown in FIGS. 1 and 5, suppresses the suppression pool water sucked from the pressure suppression chamber 18 using the drain pump 52 and the submersible pump 53. 19 is filtered to remove insoluble impurities in the suppression pool water 19, and the suppression pool water 19 filtered by the filter 54 is irradiated with ultraviolet rays to precipitate and precipitate heavy metal ions. And a purification circulation line 59 that circulates the suppression pool water 19 between the filter 54, the ultraviolet irradiation device 28, and the pressure suppression chamber 18 by oxidizing and decomposing organic matter by OH radicals generated by ultraviolet irradiation. In this purification circulation line 59, the suppression pool water is provided from the downstream side of the filter 54. 9 uptake, and a, a concentrated volume reduction of line 61 and iodide decrease concentrated heating the suppression pool water 19 back to the purification circulation line 59 by evaporation tank 60 and the electric heater 23.

  The sludge side of the filter 54 is connected to a filter sludge storage tank 62 and the like, and insoluble impurities (sludge) captured by the filter 54 are removed. The ultraviolet irradiation device 28 is connected to the purification circulation line 59 via the stop valves 63A and 63B on the upstream side and the downstream side, and is separated from the purification circulation line 59 by closing the stop valves 63A and 63B during maintenance or the like. The

  A stop valve 64 is disposed between the purification circulation line 59 to which the concentration and volume reduction line 61 is connected, and isolation valves 65A and 65B are disposed on the suction side and the outflow side of the concentration and volume reduction line 61, respectively. . Normally, the stop valve 64 is opened, and the isolation valves 65A and 65B are closed. When the suppression pool water 19 in the purification circulation line 59 is taken into the concentration and volume reduction line 61, the isolation valves 65A and 65B are opened, and the stop valve 64 is closed. Further, a circulation pump 20 is disposed between the evaporation tank 60 and the electric heater 23 in the concentration and volume reduction line 61, and the suppression pool water 19 is circulated between the evaporation tank 60 and the electric heater 23. As a result, the suppression pool water 19 is evaporated and concentrated to reduce the volume.

  A sample tank 57 is connected to the evaporation tank 60 via the condenser 24 (system cooler). The condenser 24 cools the vapor evaporated in the evaporation tank 60 and guides it to the sample tank 57, and the quality of the water is confirmed in the sample tank 57. The sample tank 57 is connected to the condensate storage tank 66 via a transfer pump 58, and a return line 67 connected to the evaporation tank 60 is disposed downstream of the transfer pump 58. Further, the exhaust gas generated in the sample tank 57 is discharged to the indoor ventilation air conditioning system 35 through the blower 34A.

  Next, the suppression pool water purification process performed by the suppression pool water purification system 12 will be described.

The insoluble impurities deposited and deposited on the bottom and wall surface of the pressure suppression chamber 18 are sucked using the drain pump 52 and the submersible pump 53 and filtered by the filter 54 to remove the insoluble impurities. Thereafter, the filtered circulating water (suppression pool water 19) is passed through the ultraviolet irradiation device 28 and irradiated with ultraviolet rays, whereby the heavy metal ions in the suppression pool water 19 are deposited in the form of precipitates (= insoluble matter). To the pressure suppression chamber 18. The deposited precipitate is filtered again by the filter 54, and filtered and removed together with the insoluble impurities deposited in the pressure suppression chamber 18. Among the heavy metal ions, the Fe ³⁺ hydroxide ion having a particularly high solubility is precipitated and precipitated as an oxide of Fe ²⁺ having a low solubility, followed by filtration.

  The reason why the ultraviolet irradiation is performed after the filtration treatment of the suppression pool water 19 is to prevent the ultraviolet light in the suppression pool water 19 from being blocked by the insoluble impurities, thereby reducing the irradiation intensity. Further, it is known that OH radicals are generated by ultraviolet irradiation of the suppression pool water 19 by the ultraviolet irradiation device 28, and this OH radical oxidizes and decomposes organic substances (including organic rust preventive agent) in the pool water 19. ing. From this, in the suppression pool water purification treatment step, it is possible to gradually remove and decompose the heavy metal ions and the organic rust inhibitor in the suppression pool water 19 in parallel.

  Further, a part of the treated water is diverted from the purification circulation line 59 of the suppression pool water 19 to the concentration and volume reduction line 61 and received by the evaporation tank 60, and the purification treatment of the suppression pool water 19 is performed by closing the isolation valves 65A and 65B. The suppression pool water 19 received in the evaporating tank 60 is heated and circulated by the electric heater 23 and the circulation pump 20 in a state of being isolated. The water temperature is controlled to about 95 ° C. before boiling, and the suppression pool water 19 is concentrated and volume-reduced in parallel with the purification treatment. The evaporation vapor of the suppression pool water 19 is condensed in the condenser 24, the water quality is confirmed in the sample tank 57, and if there is no problem in the radioactivity concentration or organic component analysis, it is transferred to the existing condensate storage tank 66. Or, it is discharged to the existing waste treatment system. If there is a problem with water quality, the water is returned to the evaporation tank 60 via the return line 67.

The concentrated waste liquid concentrated to about 1/5 in the evaporation tank 60 and reduced in volume is returned to the purification circulation line 59 by opening the isolation valves 65A and 65B, and filtered by the filter 54 as purified water. After that, it is received again in the evaporation tank 60, and batch batch volume reduction processing is performed. In this way, the volume of the suppression pool water 19 in the pressure suppression chamber 18 having 1500 m ³ or more is reduced to about 1/10 while removing insoluble impurities from the suppression pool water 19.

[C] Anti-rust agent-containing waste liquid treatment system (FIGS. 1 and 6)
The rust inhibitor-containing waste liquid treatment system 13 is a rust preventive agent (an organic rust preventive agent and an inorganic rust preventive agent) in the suppression pool water 19 which is a radioactive waste liquid concentrated and reduced in the suppression pool water purification treatment process of the previous process. The organic rust inhibitor treatment step and the inorganic rust inhibitor treatment step are carried out.

  As shown in FIGS. 1 and 6, the rust inhibitor-containing waste liquid treatment system 13 includes a treatment liquid circulation line 69 including a treatment liquid tank 68 and a circulation pump 20, a measuring instrument 22, an electric heater 23, and a desalting means. A desalter 25, a hydrogen peroxide solution injection device 27, an ultraviolet irradiation device 28, and an ozone gas mixer 70 are sequentially arranged, and a chemical solution injection device 26 is connected to the treatment liquid tank 68, and ozone gas is generated in the ozone gas mixer 70. A device 29 is connected. The ozone gas generator 29 and the ozone gas mixer 70 constitute an ozone gas supply means. Further, an ultrasonic vibrator 72 connected to the ultrasonic oscillator 71 is disposed as a refoaming means in the processing liquid tank 68, and the exhaust gas processing device 34 is connected to the processing liquid tank 68 via the vent cooler 33. .

  Among these apparatuses and devices, the processing liquid tank 68 is a shared device that diverts the evaporation tank 60 of the suppression pool water purification processing system 12. Further, the circulation pump 20, the measuring instrument 22, the electric heater 23, the desalinator 25, the chemical solution injector 26, the hydrogen peroxide solution injector 27, the ultraviolet irradiation device 28, and the ozone gas generator 29 are chemically decontaminated in the nuclear power plant. It is a device / equipment shared with the system 11. Further, when the ozone gas mixer 70 is the ejector 30, the ozone gas mixer 70 becomes a shared device with the chemical decontamination processing system 11 in the nuclear power plant.

Here, an organic carboxylic acid or an azonal organic compound is known as an organic rust inhibitor to be treated, and a chromate (for example, potassium chromate (K ₂ CrO ₄ )) is known as an inorganic rust inhibitor. . As will be described in detail later, the organic rust inhibitor is oxidatively decomposed and detoxified by ozone in the organic rust inhibitor treatment step. In addition, the inorganic rust inhibitor is rendered harmless by reducing hexavalent chromium to trivalent chromium with hydrogen peroxide solution under acidic conditions with formic acid in the inorganic rust inhibitor treatment step.

  In the treatment liquid tank 68, the concentrated and reduced suppression pool water 19 which is a waste liquid as a treatment liquid is appropriately transferred after passing through the filter 54 again, and is divided into several to several tens of times. Detoxification treatment (the above-described organic rust inhibitor treatment step and inorganic rust inhibitor treatment step) is performed in a batch manner.

For example, when the suppression pool water 19 of 1500 m ³ is volume-reduced to about 1/10, detoxification target volume 150 meters ^3. Therefore, the volume of the processing liquid tank 68 if 6 m ^3, this detoxification In order to process the whole amount of the suppression pool water 19 (150 m ³ ) to be processed, the number of times of processing in the processing liquid tank 68 is 25 times. When the suppression pool water 19 is not concentrated and reduced, the number of treatments of the suppression pool water 19 in the treatment liquid tank 68 is simply 250 times.

  The ozone gas mixer 70 blows and mixes ozone gas from the ozone gas generator 29 into the processing liquid in order to oxidatively decompose the organic rust preventive agent present in the reduced suppression pool water 19 as the processing liquid. Is. The ozone gas mixer 70 is an ozone mixer in FIG. This ozone mixer blows ozone gas into the processing liquid flowing through the processing liquid circulation line 69, thereby causing an interfacial reaction by gas-liquid mixing in the ozone mixer portion, and continuously oxidizing and decomposing organic matter containing an organic rust preventive agent. It is something to process.

  As another example of the ozone gas mixer 70, it is provided in the lower part of the processing liquid tank 68, disposed in the processing liquid circulation line 69, an air diffuser pipe for bubbling ozone gas into the processing liquid in the processing liquid tank 68. Then, a differential pressure (negative pressure) is generated in the processing liquid flowing inside, and the treatment liquid flowing in the processing liquid circulation line 69 is disposed in the processing liquid circulation line 69 in place of the ejector and the circulation pump 20 for blowing ozone gas therein. There are mixing pumps (vortex pumps) that mix ozone gas directly into the liquid. In any case, the organic matter is oxidized and decomposed by causing an interface reaction between the organic matter in the treatment liquid and the ozone gas blown in.

  The ultraviolet irradiation device 28 further accelerates the oxidative decomposition of organic matter and ozone by ultraviolet rays by irradiation, and decomposes excess hydrogen peroxide water into water and oxygen in the inorganic rust preventive treatment process. In addition, the desalter 25 includes an ion exchange resin, and thereby adsorbs and removes impurity ions and radioactive ions, which are decomposition products in the processing liquid, and performs a desalting process. The used resin side of the desalinator 25 is connected to a used resin storage tank 73 such as a radioactive waste treatment system. Further, the chemical liquid injector 26 injects, for example, formic acid into the processing liquid tank 68 to make the processing liquid acidic in the inorganic rust preventive treatment process. Further, the hydrogen peroxide solution injection device 27 injects hydrogen peroxide solution into the treatment liquid flowing in the treatment solution circulation line 69 in the same process to reduce the hexavalent chromium of the inorganic rust preventive agent to trivalent chromium. To do.

  The circulation pump 20 circulates the processing liquid in the processing liquid tank 68 in the processing liquid circulation line 69. The measuring instrument 22 provided on the downstream side of the circulation pump 20 measures the conductivity, pH, potential, etc. of the processing liquid flowing in the processing liquid circulation line 69. Moreover, the electric heater 23 heats the temperature of the treatment liquid to a predetermined temperature suitable for decomposing the organic or inorganic rust preventive agent. Furthermore, a liquid waste treatment system 74 is connected to the treatment liquid circulation line 69 for transferring the waste liquid after completion of the rust inhibitor-containing waste liquid treatment.

  The ultrasonic vibrator 72 generates ultrasonic cavitation in the treatment liquid tank 68 in the organic rust preventive treatment process, thereby re-foaming the dissolved ozone dissolved in the treatment liquid in the treatment liquid tank 68. Is. By injecting ozone gas from the ozone gas mixer 70 into the processing liquid flowing through the processing liquid circulation line 69, the amount of ozone dissolved in the processing liquid gradually increases, and reaches a saturated concentration under the temperature of the processing liquid at a certain time. . At this time, by the ultrasonic cavitation by the ultrasonic vibrator 72 in the processing liquid tank 68, the dissolved ozone dissolved in the processing liquid without being used for the interface reaction with the organic substance is re-foamed (microbubbles), Interfacial reaction is induced to promote the oxidation reaction of organic substances by ozone gas. This is intended to make effective use of the injected ozone gas by utilizing a deaeration technique using ultrasonic waves.

  Next, each process of an organic rust preventive agent and an inorganic rust preventive agent is demonstrated one by one.

  In the organic rust preventive treatment process, the treatment liquid tank 68, the ozone gas generator 29, the ozone gas mixer 70, the ultraviolet irradiation device 28, and the desalter 25 are mainly used. The reduced suppression pool water 19 is appropriately introduced as a processing liquid into the processing liquid tank 68 through the filter 54, and the circulation pump 20 is operated to circulate the processing liquid in the processing liquid circulation line 69. Then, the processing liquid is heated to a predetermined temperature by the electric heater 23, and ozone gas generated by the ozone gas generator 29 is injected and mixed into the processing liquid by an ozone gas mixer 70 (for example, an ozone mixer).

  Thereby, the organic substance containing the organic rust preventive agent in the treatment liquid is oxidized and decomposed by the oxidizing power of ozone gas. This oxidative decomposition is promoted by the ultraviolet rays irradiated from the ultraviolet irradiation device 28. By the ultrasonic cavitation generated by the ultrasonic vibrator 72, the dissolved ozone in the processing liquid is refoamed, so that the oxidative decomposition of the organic substance by the ozone gas is further promoted. The ionic component of the decomposition product produced by decomposing the organic substance containing the organic rust preventive agent is adsorbed and removed by the desalter 25 together with the radioactive ions.

  In the inorganic rust preventive treatment process, a treatment solution tank 68, a chemical solution injection device 26, a hydrogen peroxide solution injection device 27, an ultraviolet irradiation device 28, an electric heater 23, and a desalter 25 are mainly used. Since the treatment liquid at the time of passing through the organic rust preventive treatment process is alkaline, for example, formic acid is injected into the treatment liquid in the treatment liquid tank 68 from the chemical solution injector 26 to adjust the treatment liquid to be acidic.

  In this state, the processing liquid in the processing liquid tank 68 is circulated in the processing liquid circulation line 69, and hydrogen peroxide solution is injected from the hydrogen peroxide solution injecting device 27 so that it is in an inorganic rust preventive agent (for example, chromate). This hexavalent chromium is reduced to trivalent chromium to render it harmless. Chrome ions, potassium ions, and the like, which are components of the inorganic rust preventive agent, generated by the above-described treatment are adsorbed and removed by the desalter 25 together with radioactive ions. Thereafter, hydrogen peroxide solution is further injected from the hydrogen peroxide solution injector 27 to decompose formic acid remaining in the treatment liquid. After this formic acid decomposition, the hydrogen peroxide solution remaining in the treatment liquid is decomposed into water and oxygen by the ultraviolet rays irradiated from the ultraviolet irradiation device 28.

  As the refoaming means, cavitation generated by a blade using a screw propeller 75 may be used instead of ultrasonic cavitation. Depending on the place of use, there are constructions in which noise generated from the ultrasonic oscillator 71 is inconvenient, and it is effective to apply the screw propeller 75 in such constructions.

Moreover, although the thing which diverts the evaporation tank 60 used with the suppression pool water purification processing system 12 as the process liquid tank 68 was described, using the nuclear reactor pressure vessel 14 after the chemical decontamination process in a nuclear power plant was completed. Also good. In the suppression pool water purification process, when 1500 m ³ of suppression pool water is reduced to about 1/10 and the processing liquid (waste liquid) volume to be processed reaches about 150 m ³ , the reactor pressure vessel 14 Is used as the treatment liquid tank 68, the number of treatments in the rust inhibitor-containing waste liquid treatment step is reduced to about 1, and the treatment period can be shortened.

[D] Effect According to the anticorrosive agent-containing waste liquid treatment-related system 10 configured from the above-described chemical decontamination treatment system 11 in the nuclear power plant, the suppression pool water purification treatment system 12, and the antirust agent-containing waste liquid treatment system 13, the following The effects (1) to (5) are obtained.

  (1) When an ejector is used as the ozone gas mixer 70 in the rust preventive-containing waste liquid treatment system 13, the ejector 30 can be shared in the nuclear plant chemical decontamination treatment system 11. Moreover, in the suppression pool water purification processing system 12, the ultraviolet irradiation device 28, the electric heater 23, the system cooler 24 (condenser), etc. in the chemical decontamination processing system 11 in the nuclear power plant can be shared. Furthermore, in the rust preventive-containing waste liquid treatment system 13, the evaporation tank 60 in the suppression pool water purification treatment system 12, the measuring instrument 22 in the chemical decontamination treatment system 11 in the nuclear power plant 11, the electric heater 23, and the demineralizer 25. The chemical solution injection device 26, the hydrogen peroxide solution injection device 27, the ultraviolet irradiation device 28, the ozone gas generation device 29, etc. can be shared.

  Thus, in the nuclear reactor decommissioning and large-scale repair work in which the chemical decontamination process in the nuclear power plant, the suppression pool water purification process, and the rust inhibitor-containing waste liquid treatment process are carried out substantially simultaneously, the suppression pool water 19 Equipment and equipment used in each process as described above for purification and detoxification of radioactive liquid waste containing rust preventives, etc., and removal of radioactive corrosion products adhering to reactor internal structures, etc. It can be implemented rationally and economically by sharing.

  (2) In the suppression pool water purification treatment step performed by the suppression pool water purification treatment system 12, the suppression pool water 19 flowing through the purification circulation line 59 is irradiated with ultraviolet rays from the ultraviolet irradiation device 28, and heavy metals in the suppression pool water 19 Ions are used as precipitation precipitates, and organic substances in the suppression pool water 19 are oxidatively decomposed by OH radicals generated at this time. For this reason, the amount of ion-exchange resin for desalting treatment in the rust inhibitor-containing waste liquid treatment process of the next process can be reduced, and the burden of oxidative decomposition treatment of the organic rust inhibitor can be reduced. The pool water purification treatment process and the rust inhibitor-containing waste liquid treatment process) can be carried out rationally and economically.

  (3) In the suppression pool water purification treatment step by the suppression pool water purification treatment system 12, the suppression pool water 19 is concentrated and reduced by the concentration and volume reduction line 61. The volume of waste liquid to be treated is reduced in the treatment process. As a result, the treatment period in the rust inhibitor-containing waste liquid treatment process can be shortened, the on-site treatment process can be shortened, and the number of work steps can be reduced.

  (4) In the rust inhibitor-containing waste liquid treatment process by the rust inhibitor-containing waste liquid treatment system 13, ultrasonic cavitation can be generated by the ultrasonic vibrator 72 installed in the treatment liquid tank 68, The dissolved ions in the treatment liquid in the treatment liquid tank 68 can be refoamed. As a result, the oxidative decomposition reaction of the organic substance due to the interfacial reaction between the organic substance and ozone gas can be promoted, and the oxidative decomposition ability and the processing speed can be improved.

  (5) In the chemical decontamination process in the nuclear plant by the chemical decontamination process system 11 in the nuclear plant, the injection method using the ejector 30 is adopted in the oxidative decontamination process using ozone. Even when there is no jet pump, ozone gas can be safely injected into the reactor pressure vessel 14 by the required amount.

DESCRIPTION OF SYMBOLS 10 Corrosion liquid processing system 11 containing rust preventive agent Chemical decontamination treatment system 12 in nuclear power plant Suppression pool water purification treatment system 13 Waste liquid treatment system containing rust preventive agent 14 Reactor pressure vessel 19 Suppression pool water 20 Circulation pump 21 Decontamination liquid circulation Line 23 Electric heater 24 System cooler (condenser)
25 Demineralizer 29 Ozone gas generator 30 Ejector 35 Can 37 Ultraviolet irradiation lamp 42 Ozone gas bleed pump 43 Ozone gas bleed line 54 Filter 59 Purification circulation line 60 Evaporation tank 61 Concentration volume reduction line 68 Treatment liquid tank 69 Treatment liquid circulation line 70 Ozone gas mixer 72 Ultrasonic vibrator (re-foaming means)
75 Screw propeller (re-foaming means)

Claims (15)

Nuclear plant chemical decontamination process to remove radioactive corrosion products adhering to structures in contact with fluids containing radioactive materials in nuclear power plants, and insolubility in suppression pool water stored in pressure containment chambers of reactor containment vessels Suppression pool water purification treatment process that purifies the pool water by filtering out toxic impurities and rust inhibitor-containing waste liquid treatment process that decomposes and detoxifies the rust inhibitor contained in radioactive waste liquid When we carry out sequentially in time,
A construction method related to waste liquid treatment containing a rust preventive agent, characterized in that devices and equipment used in the respective steps are shared.   The ultraviolet irradiation apparatus used in the chemical decontamination treatment process in the nuclear power plant is used in the suppression pool water purification treatment process when heavy metal ions in the suppression pool water are used as precipitation precipitates, and organic substances are oxidatively decomposed. The rust preventive-containing waste liquid treatment related construction method according to claim 1.   The heater and the condenser used in the chemical decontamination process in the nuclear power plant are used when the suppression pool water is concentrated and volume-reduced in the suppression pool water purification process. The rust preventive-containing waste liquid treatment related construction method described.   The ozone gas generator, ozone gas mixer, ultraviolet irradiation device and desalter used in the chemical decontamination process in the nuclear power plant, and the evaporating tank used in the suppression pool water purification process, the rust preventive-containing waste liquid treatment process The rust preventive agent-containing waste liquid treatment related construction method according to claim 1, wherein the method is used when decomposing and detoxifying the organic rust preventive agent.   In the chemical liquid decontamination process used in the nuclear power plant chemical decontamination process, the hydrogen peroxide solution injection apparatus and the desalter, and the evaporation tank used in the suppression pool water purification process, The rust preventive agent-containing waste liquid treatment-related construction method according to claim 1, which is used when decomposing and detoxifying an inorganic rust preventive agent.   In mixing the ozone gas into the circulating cooling water or decontamination liquid in the chemical decontamination treatment process in the nuclear power plant, the ejector used when mixing the ozone gas into the waste liquid in the rust preventive-containing waste liquid treatment process The rust preventive agent-containing waste liquid treatment related construction method according to claim 1, wherein the method is used. A chemical decontamination treatment system in the nuclear power plant for performing a chemical decontamination treatment process in the nuclear power plant for removing radioactive corrosion products attached to a structure in contact with a fluid containing a radioactive substance in the nuclear power plant;
A suppression pool water purification treatment system for performing a suppression pool water purification treatment step of purifying the pool water by filtering insoluble impurities in the suppression pool water stored in the pressure suppression chamber of the reactor containment vessel; and
It has a rust inhibitor-containing waste liquid treatment system for carrying out a rust inhibitor-containing waste liquid treatment process for decomposing and detoxifying the rust inhibitor contained in the radioactive waste liquid,
When the chemical decontamination process in the nuclear power plant, the suppression pool water purification process, and the rust inhibitor-containing waste liquid treatment process are sequentially performed at substantially the same time, apparatuses and equipment used in the treatment systems are A rust preventive-containing waste liquid treatment-related system characterized by being shared. The suppression pool water purification system is
A filter that removes insoluble impurities in the pool water by filtering the suppression pool water sucked from the pressure suppression chamber;
An ultraviolet irradiation device that irradiates the pool water filtered with this filter with ultraviolet rays to precipitate heavy metal ions as precipitates and oxidatively decomposes organic matter;
The rust inhibitor-containing waste liquid treatment according to claim 7, further comprising a purification circulation line for circulating the pool water between the filter, the ultraviolet irradiation device, and the pressure suppression chamber. Related system.   The purification circulation line is provided with a concentration and volume reduction line that takes in suppression pool water from the downstream side of the filter, heats the pool water with an evaporating tank and a heater to reduce the concentration, and returns it to the circulation line. The rust inhibitor-containing waste liquid treatment-related system according to claim 8, wherein   The rust preventive-containing waste liquid treatment according to claim 8, wherein the ultraviolet irradiation device is configured by arranging a plurality of ultraviolet irradiation lamps in parallel in a can in which a treatment liquid such as suppression pool water flows. Related system. The rust inhibitor-containing waste liquid treatment system is:
A treatment tank for storing and detoxifying the treatment liquid as waste liquid;
An ozone gas supply means for supplying ozone gas to the treatment liquid to oxidatively decompose the organic rust inhibitor;
A desalting means for desalting the decomposition products in the treatment liquid;
A circulation line for circulating a treatment liquid between the treatment liquid tank, the ozone supply means and the desalting means;
The rust preventive agent-containing composition according to claim 7, further comprising a refoaming unit that is installed in the treatment liquid tank and refoams the dissolved ozone dissolved in the treatment liquid. Waste liquid treatment related system.   12. The rust preventive-containing waste liquid treatment-related system according to claim 11, wherein the re-foaming means is an ultrasonic vibrator that generates ultrasonic cavitation or a screw propeller that generates cavitation by blades. The chemical decontamination treatment system in the nuclear power plant is
A circulation line for circulating cooling water or decontamination liquid in the reactor pressure vessel;
An ozone gas supply device including an ozone gas generator and an ozone gas mixer, which mixes ozone gas with cooling water or decontamination liquid flowing through this circulation line,
The ozone gas mixer is an ejector that mixes ozone gas from the ozone generator into a part of cooling water or decontamination liquid taken into the circulation line from the bottom of the reactor pressure vessel. The anticorrosive-containing waste liquid treatment-related system according to claim 7, wherein a decontamination liquid mixed with ozone gas is introduced into the bottom of the reactor pressure vessel.   A decontamination liquid circulation pump that is arranged in the circulation line and circulates cooling water or decontamination liquid and an ozone gas extraction pump that supplies cooling water or decontamination liquid to the ejector are connected in series so that they can be operated simultaneously. The rust preventive agent-containing waste liquid treatment related system according to claim 13.   The system according to claim 13, wherein a plurality of the ejectors are arranged in parallel so that the amount of ozone gas mixed with the cooling water or the decontamination liquid can be increased. .

Images