A coolant circulation purification system and method applied to a nuclear power plant

Abstract

The application belongs to the field of coolant purification of nuclear power plants, and particularly relates to a coolant circulating purification system and method applied to nuclear power plants. The system comprises: a primary coolant storage system cation exchanger, a primary coolant storage system anion exchanger, a primary coolant storage system resin collector, a primary coolant treatment system cation exchanger, a primary coolant treatment system anion exchanger, and a primary coolant treatment system resin collector. A third bypass is arranged in front of the inlet of the primary coolant treatment system cation exchanger, and a valve is arranged in the third bypass to connect to a position after the inlet of the primary coolant storage system cation exchanger. The application can effectively improve the reliability of the primary coolant treatment system in purifying the coolant, and can switch the primary coolant storage system ion exchanger to operate in the case of failure of the primary coolant treatment system ion exchanger.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of coolant purification of nuclear power plant, and particularly relates to a coolant circulating purification system and method applied to nuclear power plant. BACKGROUND

[0002] The coolant circulating purification system of the second phase project of the Tianwan nuclear power plant first loop includes a coolant purification system, a coolant storage system and a coolant treatment system, and each system is provided with an ion exchanger for removing dissolved impurities in the coolant.

[0003] The first loop coolant storage system is used for receiving, storing and treating the drainage from the first loop, and is provided with a first loop coolant storage system cation exchanger for removing alkali metal ions such as Na + , K + and the like cations in the first loop during the operation of the reactor; and a first loop coolant storage system anion exchanger for further removing borate in the first loop coolant when the borate concentration is as low as less than 0.3 g / L at the end of the fuel life, so as to further reduce the borate concentration in the first loop. The ion concentration indexes at the outlets of the first loop coolant storage system cation and anion exchangers are shown in Table 1:

[0004] Table 1 Ion concentration indexes at the outlets of the first loop coolant storage system cation and anion exchangers

[0005]

[0006] When the total alkali metal concentration in the first loop coolant meets the operation requirement, the first loop coolant storage system cation exchanger is taken out of operation. When the chemical analysis result of the borate concentration meets the concentration requirement, the first loop coolant storage system anion exchanger is taken out of operation.

[0007] The first loop coolant treatment system is used for purifying the borate-containing water of the borate-containing water storage system, the first loop coolant storage system and the like, and is designed with a first loop coolant treatment system cation exchanger and a first loop coolant treatment system anion exchanger. The first loop coolant treatment system cation exchanger is used for removing cation impurities and radioactive ions in the borate solution, and the first loop coolant treatment system anion exchanger is used for removing anions such as Cl - , F - and the like in the borate solution. The nuclear grade resin of the exchangers needs to be transferred to the radioactive solid waste treatment system for solidification after failure. The ion concentration indexes at the outlets of the first loop coolant treatment system cation and anion exchangers are shown in Table 2:

[0008] Table 2 Ion concentration indexes at the outlets of the first loop coolant treatment system cation and anion exchangers

[0009]

[0010] When the filtrate of the outlet borate solution of the cation exchanger of the primary coolant treatment system detects potassium ions or sodium ions, the cation resin should be replaced; when the filtrate of the outlet borate solution of the anion filter of the primary coolant treatment system has a chlorine ion concentration > 50 μg / L, the anion resin should be replaced.

[0011] In the prior art, the primary coolant storage system is used to remove alkali metals and boron at the end of life, but due to the partial overlap of the functions of the primary coolant storage system and the coolant purification system, the cation exchanger of the primary coolant storage system is not often used, and the anion exchanger can still adsorb SO4 2- , NO3 - , Cl - , etc. after the boron removal fails, so the primary coolant storage system anion / cation exchanger has the condition for reuse.

[0012] Therefore, it is urgent to develop a primary coolant circulation purification system to reuse the primary coolant storage system anion / cation exchanger and reduce the production of radioactive solid waste in the power plant. SUMMARY

[0013] The purpose of the present application is to provide a coolant circulation purification system and method applied to a nuclear power plant, which can effectively improve the reliability of the primary coolant treatment system in purifying the coolant, and can switch the operation of the ion exchanger of the primary coolant storage system in the case of failure of the ion exchanger of the primary coolant treatment system; reduce the loading and unloading times of the ion exchanger resin, and reduce the production of solid radioactive waste in the nuclear power plant.

[0014] The technical solution to achieve the purpose of the present application is:

[0015] A coolant circulation purification system applied to a nuclear power plant, the system comprising: a primary coolant storage system cation exchanger, a primary coolant storage system anion exchanger, a primary coolant storage system resin replenisher, a primary coolant treatment system cation exchanger, a primary coolant treatment system anion exchanger, and a primary coolant treatment system resin replenisher;

[0016] The primary coolant treatment system cation exchanger, the primary coolant treatment system anion exchanger, and the primary coolant treatment system resin replenisher are connected in series;

[0017] The primary coolant storage system cation exchanger, the primary coolant storage system anion exchanger, and the primary coolant storage system resin replenisher are connected in series;

[0018] The first bypass pipeline is directly connected to the anion exchanger inlet of the primary coolant storage system, and the second bypass pipeline is directly connected to the resin collector of the primary coolant storage system.

[0019] The third bypass pipeline is provided before the cation exchanger inlet of the primary coolant treatment system.

[0020] The fourth bypass pipeline is provided before the anion exchanger of the primary coolant treatment system.

[0021] The fifth bypass pipeline is provided after the anion exchanger of the primary coolant storage system.

[0022] Valves are respectively arranged between the cation exchanger inlet of the primary coolant treatment system, the cation exchanger of the primary coolant treatment system and the anion exchanger of the primary coolant treatment system, and between the anion exchanger of the primary coolant treatment system and the resin collector of the primary coolant treatment system.

[0023] Valves are respectively arranged between the cation exchanger inlet of the primary coolant storage system, the cation exchanger of the primary coolant storage system and the anion exchanger of the primary coolant storage system, and between the anion exchanger of the primary coolant storage system and the resin collector of the primary coolant storage system.

[0024] The anion exchanger inlet of the primary coolant storage system is provided with a first inlet valve.

[0025] A coolant circulation purification method applied to a nuclear power plant, the method comprising:

[0026] Step 1: when the total alkali metal content of the primary coolant exceeds the standard and the reactor purification system cannot be controlled, the cation exchanger of the primary coolant storage system is operated alone to remove alkali metal ions.

[0027] Step 2: when the borate concentration of the primary coolant is reduced to less than 0.3 g / L at the end of the reactor life, the anion exchanger of the primary coolant storage system is operated alone to remove low-concentration borate solution of the primary coolant at the end of the life.

[0028] Step 3, when the boron acid concentration of the primary coolant needs to be reduced and the positive bed of the reactor purification system cannot be controlled, the positive ion exchanger of the primary coolant storage system, the negative ion exchanger of the primary coolant storage system are jointly operated to purify the primary coolant;

[0029] Step 4, when the impurity ion content of the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system exceeds the standard and the water quality needs to be purified, the positive ion exchanger of the primary coolant treatment system and the negative ion exchanger of the primary coolant treatment system are jointly operated to purify the water quality of the coolant treatment system;

[0030] Step 5, when the negative ion exchanger of the primary coolant storage system is removed at the end of the service life and the impurity ions of the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system need to be purified, the positive ion exchanger of the primary coolant treatment system and the negative ion exchanger of the primary coolant storage system are jointly operated to purify the water quality of the coolant treatment system;

[0031] Step 6, when the positive ion exchanger of the primary coolant storage system has a planned unloading but the unloading is not completed, and the impurity ions of the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system need to be purified, the positive ion exchanger of the primary coolant storage system and the negative ion exchanger of the primary coolant treatment system are jointly operated to purify the water quality of the coolant treatment system;

[0032] Step 7, when the negative ion exchanger of the primary coolant storage system is removed at the end of the service life and the positive ion exchanger of the primary coolant storage system has a planned unloading but the unloading is not completed, and the impurity ions of the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system need to be purified, the positive ion exchanger of the primary coolant storage system and the negative ion exchanger of the primary coolant storage system are jointly operated to purify the water quality of the coolant treatment system.

[0033] The beneficial technical effects of the present application are that:

[0034] 1. The coolant circulation purification system and method applied to a nuclear power plant provided by the present application can fully utilize the functional failure resin to remove the impurity ions in the coolant.

[0035] 2. The coolant circulation purification system applied to a nuclear power plant provided by the present application can improve the reliability of the primary coolant treatment system in purifying the coolant, and the ion exchanger of the primary coolant storage system can be switched to operate in the case of failure of the ion exchanger of the primary coolant treatment system.

[0036] 3. The coolant circulation purification system applied to a nuclear power plant provided by the present application can reduce the loading and unloading times of the ion exchanger resin.

[0037] 4. The coolant circulating purification system for nuclear power plants provided by the present application can reduce the amount of solid radioactive waste produced by nuclear power plants.

[0038] 5. The coolant circulating purification system for nuclear power plants provided by the present application can reduce the operation and maintenance cost of the system and reduce the operation burden of the system.

[0039] 6. The coolant circulating purification system for nuclear power plants provided by the present application can reduce the radiation dose of personnel during resin unloading and solidification.

[0040] 7. The coolant circulating purification system for nuclear power plants provided by the present application can reduce the number of nuclear-grade resins to be purchased and reduce the cost of solid waste solidification, storage and transportation. BRIEF DESCRIPTION OF DRAWINGS

[0041] Figure 1 The flow chart of the coolant circulating purification system for nuclear power plants provided by the present application is shown in the figure.

[0042] In the figure, 1 is the inlet valve of the cation ion exchanger of the primary coolant storage system, 2 is the cation ion exchanger of the primary coolant storage system, 3 is the first bypass valve, 4 is the outlet valve of the cation ion exchanger of the primary coolant storage system, 5 is the second bypass valve, 6 is the first inlet valve of the anion ion exchanger of the primary coolant storage system, 7 is the second inlet valve of the anion ion exchanger of the primary coolant storage system, 8 is the anion ion exchanger of the primary coolant storage system, 9 is the first outlet valve of the anion ion exchanger of the primary coolant storage system, 10 is the second outlet valve of the anion ion exchanger of the primary coolant storage system, 11 is the outlet valve of the anion ion exchanger of the primary coolant storage system, 12 is the resin collector of the primary coolant storage system, 13 is the inlet valve of the cation ion exchanger of the primary coolant treatment system, 14 is the cation ion exchanger of the primary coolant treatment system, 15 is the outlet valve of the cation ion exchanger of the primary coolant treatment system, 16 is the anion ion exchanger of the primary coolant treatment system, 17 is the outlet valve of the anion ion exchanger of the primary coolant treatment system, and 18 is the resin collector of the primary coolant treatment system. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below in combination with the accompanying drawings and examples.

[0044] In the prior art, the ion exchanger of the primary coolant storage system and the ion exchanger of the primary coolant treatment system are not associated, and the waste resin is treated as solid radioactive waste after the ion exchangers of the two systems complete the design functions in the respective systems; even if the ion exchanger is not used, the resin in the exchanger needs to be unloaded after a long period of placement due to resin aging or maintenance work such as inspection and maintenance. After research, the primary coolant purified by the coolant purification system no longer needs to be purified by the cation exchanger of the primary coolant storage system, so the cation exchanger is actually not frequently used; and the anion exchanger of the primary coolant storage system can continue to absorb SO4 2- , NO3 - , Cl - and other anions after absorbing low-concentration boric acid at the end of the reactor life, and has the condition for reuse; while the cation exchanger and the anion exchanger of the primary coolant treatment system are frequently used, and the resin is frequently replaced, resulting in a large amount of solid radioactive waste.

[0045] Therefore, the present application redesigns the functions of the new primary coolant storage system and the primary coolant treatment system, so that the cation exchanger and the anion exchanger of the primary coolant storage system can be used to purify the coolant of the primary coolant treatment system, so that the cation exchanger and the anion exchanger of the primary coolant storage system are fully utilized.

[0046] As shown in Figure 1 , the present application provides a coolant circulating purification system applied to a nuclear power plant, comprising: a primary coolant storage system cation exchanger 2, a primary coolant storage system anion exchanger 8, a primary coolant storage system resin collector 12, a primary coolant treatment system cation exchanger 14, a primary coolant treatment system anion exchanger 16, and a primary coolant treatment system resin collector 18.

[0047] The primary coolant treatment system cation exchanger 14, the primary coolant treatment system anion exchanger 16, and the primary coolant treatment system resin collector 18 are connected in series.

[0048] In a specific embodiment, a primary coolant treatment system cation exchanger 14 inlet, a primary coolant treatment system cation exchanger 14 and a primary coolant treatment system anion exchanger 16, a primary coolant treatment system anion exchanger 16 and a primary coolant treatment system resin replenisher 18 are respectively provided with a primary coolant treatment system cation exchanger inlet valve 13, a primary coolant treatment system cation exchanger outlet valve 15, a primary coolant treatment system anion exchanger outlet valve 17. That is, the primary coolant treatment system cation exchanger inlet valve 13, the primary coolant treatment system cation exchanger 14, the primary coolant treatment system cation exchanger outlet valve 15, the primary coolant treatment system anion exchanger 16, the primary coolant treatment system anion exchanger outlet valve 17 and the primary coolant treatment system resin replenisher 18 are connected in series.

[0049] The primary coolant storage system cation exchanger 2, the primary coolant storage system anion exchanger 8 and the primary coolant storage system resin replenisher 12 are connected in series.

[0050] In a specific embodiment, a primary coolant storage system cation exchanger 2 inlet, a primary coolant storage system cation exchanger 2 and a primary coolant storage system anion exchanger 8, a primary coolant storage system anion exchanger 8 and a primary coolant storage system resin replenisher 12 are respectively provided with a primary coolant storage system cation exchanger inlet valve 1, a primary coolant storage system cation exchanger outlet valve 4, a primary coolant storage system anion exchanger outlet valve 11. That is, the primary coolant storage system cation exchanger inlet valve 1, the primary coolant storage system cation exchanger 2, the primary coolant storage system cation exchanger outlet valve 4, the primary coolant storage system anion exchanger 8, the primary coolant storage system anion exchanger outlet valve 11 and the primary coolant storage system resin replenisher 12 are connected in series.

[0051] In a specific embodiment, a first bypass line and a first bypass valve 3 are arranged at a primary coolant storage system cation exchanger 2 inlet position and directly connected to a primary coolant storage system anion exchanger 8 inlet; a second bypass line and a second bypass valve 5 are arranged at a primary coolant storage system cation exchanger 2 outlet position and directly connected to a primary coolant storage system resin replenisher 12. The coolant purified by the primary coolant storage system cation exchanger 2 can not pass through the primary coolant storage system anion exchanger 8 and directly return to the primary coolant loop or be discharged into the coolant storage tank through the primary coolant storage system resin replenisher 12.

[0052] A first inlet valve 6 is provided at the inlet of the primary coolant storage system anion exchanger 8, which is an electric valve for bypassing the primary coolant storage system cation exchanger 2 and the primary coolant storage system anion exchanger 8 simultaneously.

[0053] A second inlet valve 7 is provided at the inlet of the primary coolant storage system anion exchanger 8, which is a manual valve for isolated maintenance when the primary coolant storage system anion exchanger first inlet valve 6 fails.

[0054] A first outlet valve 9 and a second outlet valve 10 are provided at the outlet of the primary coolant storage system anion exchanger 8, the first outlet valve 9 is a manual valve for isolated maintenance when the primary coolant storage system anion exchanger second outlet valve 10 fails, and the second outlet valve 10 is an electric valve for isolating the primary coolant storage system anion exchanger 8 during operation.

[0055] A third bypass is provided before the primary coolant treatment system cation exchanger inlet valve 13, which connects to a position after the primary coolant storage system cation exchanger inlet valve 1 through a third bypass valve 19.

[0056] A fourth bypass is provided before the primary coolant storage system anion exchanger inlet valve 6, which connects to a position before the primary coolant treatment system anion exchanger 16 through a fourth bypass valve 20.

[0057] A fifth bypass is provided after the primary coolant storage system anion exchanger first outlet valve 9, which connects to a position after the primary coolant treatment system anion exchanger outlet valve 17 and before the primary coolant treatment system resin collector 18 through a fifth bypass valve 21.

[0058] The present application provides a coolant circulation purification method applied to a nuclear power plant, which specifically comprises the following steps:

[0059] When the total alkali metal content of the primary coolant exceeds the standard and the reactor purification system cannot be controlled, the system operates in mode one, i.e., the primary coolant storage system cation exchanger 2 operates alone to remove alkali metal ions. In this mode, valves 1, 5, and 11 are opened, and valves 3, 4, 6, 10, 19, 20, and 21 are closed, and the cation exchanger 2 and the resin collector 12 operate.

[0060] Step 2, when the boron concentration in the primary coolant is reduced to less than 0.3 g / L at the end of the reactor life, the system is operated in mode 2, i.e. the anion exchanger 8 of the primary coolant storage system is operated alone to remove the low concentration of boron acid solution in the primary coolant at the end of the reactor life. In mode 2, the valves 3, 6, 7, 9, 10 and 11 are opened, the valves 1, 4, 5, 19, 20 and 21 are closed, and the anion exchanger 8 and the resin replenisher 12 are operated.

[0061] Step 3, when the boron concentration in the primary coolant needs to be reduced and the cation bed of the reactor purification system cannot be controlled in modes 1 and 2, the system is operated in mode 3, i.e. the cation exchanger 2 of the primary coolant storage system and the anion exchanger 8 of the primary coolant storage system are jointly operated to purify the primary coolant. In mode 3, the valves 1, 4, 6, 7, 9, 10 and 11 are opened, the valves 3, 5, 19, 20 and 21 are closed, and the cation exchanger 2, the anion exchanger 8 and the resin replenisher 12 are operated.

[0062] Step 4, when the impurity ion content in the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system exceeds the standard and the water quality needs to be purified, the system is operated in mode 4, i.e. the cation exchanger 14 of the primary coolant treatment system and the anion exchanger 16 of the primary coolant treatment system are jointly operated to purify the water quality in the coolant treatment system. In mode 4, the valves 13, 15 and 17 are opened, the valves 19, 20 and 21 are closed, and the cation exchanger 14, the anion exchanger 16 and the resin replenisher 18 are operated.

[0063] Step 5, when the boron is removed from the anion exchanger 8 of the primary coolant storage system at the end of the life and the impurity ions in the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system need to be purified, the system is operated in mode 5, i.e. the cation exchanger 14 of the primary coolant treatment system and the anion exchanger 8 of the primary coolant storage system are jointly operated to purify the water quality in the coolant treatment system. In mode 5, the valves 6, 7, 9, 10, 11, 13, 15 and 20 are opened, the valves 3, 4, 5, 17, 19 and 21 are closed, and the cation exchanger 14, the anion exchanger 8 and the resin replenisher 12 are operated.

[0064] Step 6, when the primary coolant storage system cation exchanger 2 has a planned unloading but the unloading is not completed, and the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system needs to be purified, the system runs in mode six, i.e. the primary coolant storage system cation exchanger 2 and the primary coolant treatment system anion exchanger 16 jointly purify the water quality of the coolant treatment system. In mode six, the valves 1, 4, 17 and 20 are opened, the valves 3, 5, 6, 10, 15, 19 and 21 are closed, and the cation exchanger 2, the anion exchanger 16 and the resin replenisher 18 run.

[0065] Step 7, when the primary coolant storage system anion exchanger 8 is at the end of service and boron is removed, the primary coolant storage system cation exchanger 2 has a planned unloading but the unloading is not completed, and the solution in the boron water storage tank of the boron water storage system, the storage tank of the coolant storage system or the coolant treatment system needs to be purified, the system runs in mode seven, i.e. the primary coolant storage system cation exchanger 2 and the primary coolant storage system anion exchanger 8 jointly purify the water quality of the coolant treatment system. In mode seven, the valves 4, 6, 9, 10, 11 and 19 are opened, the valves 1, 3, 5, 13, 20 and 21 are closed, and the cation exchanger 2, the anion exchanger 8 and the resin replenisher 12 run.

[0066] The application has been described in detail above with reference to the drawings and embodiments, but the application is not limited to the above-described embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the application. The contents not described in detail in the application can adopt the prior art.

Claims

1. A coolant circulation purification system for a nuclear power plant, characterized in that: The system comprises: a primary coolant storage system cation exchanger (2), a primary coolant storage system anion exchanger (8), a primary coolant storage system resin collector (12), a primary coolant treatment system cation exchanger (14), a primary coolant treatment system anion exchanger (16), and a primary coolant treatment system resin collector (18); A primary coolant treatment system cation exchanger (14), a primary coolant treatment system anion exchanger (16), and a primary coolant treatment system resin collector (18) are sequentially connected in series; A primary coolant storage system cation exchanger (2), a primary coolant storage system anion exchanger (8), and a primary coolant storage system resin collector (12) are sequentially connected in series; A first bypass pipeline is provided at the inlet of the cation exchanger (2) of the primary coolant storage system, and the first bypass pipeline is directly connected to the inlet of the anion exchanger (8) of the primary coolant storage system; a second bypass pipeline is provided at the outlet of the cation exchanger (2) of the primary coolant storage system, and the second bypass pipeline is directly connected to the resin collector (12) of the primary coolant storage system; A third bypass is provided before the inlet of the cation exchanger (14) of the primary coolant treatment system, and is connected to a position after the inlet of the cation exchanger (2) of the primary coolant storage system through a third bypass valve (19); A fourth bypass is provided before the inlet of the anion exchanger (8) of the primary coolant storage system, and is connected to the anion exchanger (16) of the primary coolant treatment system through a fourth bypass valve (20); A fifth bypass is provided after the outlet of the anion exchanger (8) of the primary coolant storage system, and is connected to a position after the outlet of the anion exchanger (16) of the primary coolant treatment system and before the resin collector (18) of the primary coolant treatment system through a fifth bypass valve (21); Valves are respectively provided at the inlet of the primary coolant treatment system cation exchanger (14), between the primary coolant treatment system cation exchanger (14) and the primary coolant treatment system anion exchanger (16), and between the primary coolant treatment system anion exchanger (16) and the primary coolant treatment system resin collector (18); Valves are respectively provided at the inlet of the primary coolant storage system cation exchanger (2), between the primary coolant storage system cation exchanger (2) and the primary coolant storage system anion exchanger (8), and between the primary coolant storage system anion exchanger (8) and the primary coolant storage system resin collector (12); The inlet of the primary-circuit coolant storage system anion exchanger (8) is provided with a primary-circuit coolant storage system anion exchanger first inlet valve (6).

2. A coolant circulation purification method for a nuclear power plant, using the coolant circulation purification system for a nuclear power plant according to claim 1, characterized in that: The method comprises: Step 1: When the total alkali metal content of the primary coolant exceeds the standard and the reactor purification system cannot control it, the primary coolant storage system cation exchanger (2) operates alone to remove alkali metal ions; Step 2: When the boric acid concentration in the primary circuit at the end of the reactor life is reduced to less than 0.3 g / L, the anion exchanger (8) of the primary coolant storage system is operated alone to remove the low-concentration boric acid solution in the primary circuit at the end of the reactor life; Step 3: When the boric acid concentration in the primary circuit needs to be reduced and the cation bed of the reactor purification system cannot be controlled, the cation exchanger (2) of the primary circuit coolant storage system and the anion exchanger (8) of the primary circuit coolant storage system are operated in conjunction to purify the primary circuit coolant; Step 4: When the impurity ion content of the solution in the boron water storage tank of the boron-containing water storage system, the coolant storage system storage tank or the coolant treatment system exceeds the standard and needs to be purified, the primary coolant treatment system cation exchanger (14) and the primary coolant treatment system anion exchanger (16) jointly operate to purify the coolant treatment system water quality; Step 5: When the anion exchanger (8) of the primary coolant storage system has completely removed the boron at the end of its service life and it is necessary to purify the impurity ions in the boron water storage tank of the boron-containing water storage system, the coolant storage system storage tank or the solution in the coolant treatment system, the cation exchanger (14) of the primary coolant treatment system and the anion exchanger (8) of the primary coolant storage system are operated in conjunction to purify the water quality of the coolant treatment system; Step 6: When the cation exchanger (2) of the primary coolant storage system has an unloading plan but has not completed the unloading, and when it is necessary to purify the impurity ions in the boron water storage tank of the boron-containing water storage system, the coolant storage system storage tank, or the solution in the coolant treatment system, the cation exchanger (2) of the primary coolant storage system and the anion exchanger (16) of the primary coolant treatment system are jointly operated to purify the water quality of the coolant treatment system; Step 7: When the anion exchanger (8) of the primary coolant storage system has completely removed the boron at the end of its service life, and the cation exchanger (2) of the primary coolant storage system has an unloading plan but has not completed the unloading, and when it is necessary to purify the impurity ions in the boron water storage tank of the boron-containing water storage system, the coolant storage system storage tank or the coolant treatment system solution, the cation exchanger (2) of the primary coolant storage system and the anion exchanger (8) of the primary coolant storage system are jointly operated to purify the water quality of the coolant treatment system.

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