Coolant circulation purification system and method applied to nuclear power plant

Abstract

The invention belongs to the field of coolant purification of nuclear power plants, and particularly relates to a coolant circulation purification system and method applied to a nuclear power plant. The system comprises a primary loop coolant storage system cation exchanger, a primary loop coolant storage system anion exchanger, a primary loop coolant storage system resin complementing device, a primary loop coolant treatment system cation exchanger, a primary loop coolant treatment system anion exchanger and a primary loop coolant treatment system resin complementing device. And a third bypass is arranged in front of the inlet of the cation exchanger of the primary loop coolant treatment system, and is connected to a position behind the inlet of the cation exchanger of the primary loop coolant storage system through a third bypass valve. The reliability of purifying the coolant by the primary loop coolant treatment system can be effectively improved, and the ion exchanger of the primary loop coolant storage system can be switched to operate under the condition that the ion exchanger of the primary loop coolant treatment system breaks down.

Description

Technical Field

[0001] The present invention belongs to the field of coolant purification in nuclear power plants, and in particular relates to a coolant circulation purification system and method applied to nuclear power plants. Background Art

[0002] The primary coolant circulation purification system of the Tianwan Nuclear Power Plant Phase II project includes a coolant purification system, a coolant storage system and a coolant treatment system. Each system is equipped with an ion exchanger to remove dissolved impurities in the coolant.

[0003] The primary coolant storage system is used to receive, store and process the drainage from the primary coolant storage system. The system is equipped with a primary coolant storage system cation exchanger to remove alkali metal ions such as Na + , K + The anion exchanger in the primary coolant storage system is installed. At the end of the fuel life, when the boric acid concentration in the primary coolant drops to less than 0.3g / L, the anion bed is put into use to continue removing boron to further reduce the boric acid concentration in the primary coolant storage system. The ion concentration indicators of the cation and anion exchangers at the outlet of the primary coolant storage system are shown in Table 1:

[0004] Table 1 Ion concentration index of the cation and anion exchanger outlet of the primary coolant storage system

[0005]

[0006] When the total alkali metal concentration in the primary coolant meets the operating requirements, the cation exchanger in the primary coolant storage system is shut down. When the boric acid concentration chemical analysis results meet the concentration requirements, the anion exchanger in the primary coolant storage system is shut down.

[0007] The primary coolant treatment system is used to purify boron-containing water in boron-containing water storage systems, primary coolant storage systems, and other systems. The system is designed with a primary coolant treatment system cation exchanger and a primary coolant treatment system anion exchanger. Among them, the primary coolant treatment system cation exchanger is used to remove cationic impurities and radioactive ions in the boric acid solution; the primary coolant treatment system anion exchanger is used to remove Cl in the boric acid solution. - 、F - The nuclear-grade resin of the exchanger that has failed needs to be transferred to the radioactive solid waste treatment system for solidification. The ion concentration indicators of the cation and anion exchanger outlets of the primary coolant treatment system are shown in Table 2:

[0008] Table 2 Ion concentration index of cation and anion exchanger outlet of the primary coolant treatment system

[0009]

[0010] When potassium ions or sodium ions are detected in the boric acid solution filtrate at the outlet of the cation exchanger of the primary coolant treatment system, the cation resin should be replaced; when the chloride ion concentration of the boric acid solution filtrate at the outlet of the anion filter of the primary coolant treatment system is greater than 50μg / L, the anion resin should be replaced.

[0011] In the prior art, the primary coolant storage system is used to remove alkali metals and end-of-life boron. However, due to the partial overlap between 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 after the boron removal fails. 2- , NO3 - , Cl - Therefore, the anion / cation exchangers in the primary coolant storage system are all capable of being reused.

[0012] Therefore, it is urgent to develop a primary coolant circulation purification system to reuse the anion / cation exchangers in the primary coolant storage system and reduce the amount of radioactive solid waste produced in power plants. Summary of the Invention

[0013] The object of the present invention is to provide a coolant circulation purification system and method for use in nuclear power plants. The system can effectively improve the reliability of the primary coolant treatment system in purifying the coolant. In the event of a failure of the ion exchanger in the primary coolant treatment system, the ion exchanger in the primary coolant storage system can be switched to operate; the number of loading and unloading times of the ion exchanger resin can be reduced, and the amount of solid radioactive waste generated in the nuclear power plant can be reduced.

[0014] The technical solution for achieving the purpose of the present invention is as follows:

[0015] A coolant circulation purification system for a nuclear power plant, comprising: 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;

[0016] A cation exchanger of the primary coolant treatment system, an anion exchanger of the primary coolant treatment system, and a resin collector of the primary coolant treatment system are sequentially connected in series;

[0017] A cation exchanger of a primary coolant storage system, an anion exchanger of a primary coolant storage system, and a resin collector of a primary coolant storage system are sequentially connected in series;

[0018] A first bypass pipeline is provided at the inlet of the cation exchanger of the primary coolant storage system, and the first bypass pipeline is directly connected to the inlet of the anion exchanger of the primary coolant storage system; a second bypass pipeline is provided at the outlet of the cation exchanger 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] A third bypass is provided before the inlet of the cation exchanger of the primary-loop coolant treatment system, and is connected to a position behind the inlet of the cation exchanger of the primary-loop coolant storage system through the third bypass valve.

[0020] A fourth bypass is provided in front of the anion exchanger inlet of the primary coolant storage system, and is connected to the anion exchanger in front of the primary coolant treatment system through the fourth bypass valve.

[0021] A fifth bypass is provided after the anion exchanger outlet of the primary coolant storage system, and is connected to a position after the anion exchanger outlet of the primary coolant treatment system and before the resin collector of the primary coolant treatment system through the fifth bypass valve.

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

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

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

[0025] A coolant circulation purification method for 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 control it, the cation exchanger of the primary coolant storage system operates alone to remove the alkali metal ions;

[0027] Step 2: When the boric acid concentration in the primary circuit decreases to less than 0.3 g / L at the end of the reactor life, the anion exchanger in the primary coolant storage system operates alone to remove the low-concentration boric acid solution in the primary circuit at the end of the reactor life;

[0028] 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 of the primary coolant storage system and the anion exchanger of the primary coolant storage system are operated in combination 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-containing water storage system, the coolant storage system storage tank, or the coolant treatment system exceeds the standard and requires water purification, the cation exchanger of the primary coolant treatment system and the anion exchanger of the primary coolant treatment system are operated in conjunction to purify the water quality of the coolant treatment system;

[0030] Step 5: When the anion exchanger of the primary coolant storage system has completely removed boron at the end of its service life and impurity ions in the boron-containing water storage system boron water storage tank, the coolant storage system storage tank, or the coolant treatment system solution need to be purified, the cation exchanger of the primary coolant treatment system and the anion exchanger of the primary coolant storage system are operated in conjunction to purify the coolant treatment system water quality;

[0031] Step 6: When the cation exchanger 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 of the primary coolant storage system and the anion exchanger of the primary coolant treatment system are operated in conjunction to purify the water quality of the coolant treatment system;

[0032] Step 7. When the anion exchanger of the primary coolant storage system has completed boron removal at the end of its service life, and the cation exchanger 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 of the primary coolant storage system and the anion 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 invention are:

[0034] 1. The present invention provides a coolant circulation purification system and method for use in nuclear power plants, which can fully utilize the resin that has failed in its function to remove impurity ions in the coolant.

[0035] 2. The present invention provides a coolant circulation purification system for use in nuclear power plants, which can improve the reliability of the primary coolant treatment system in purifying coolant. In the event of a failure of the ion exchanger in the primary coolant treatment system, the ion exchanger in the primary coolant storage system can be switched to operate.

[0036] 3. The present invention provides a coolant circulation purification system for use in nuclear power plants, which can reduce the number of times ion exchanger resin is loaded and unloaded.

[0037] 4. The coolant circulation purification system provided by the present invention is applied to a nuclear power plant, which can reduce the amount of solid radioactive waste generated by the nuclear power plant.

[0038] 5. The coolant circulation purification system provided by the present invention for use in nuclear power plants can reduce system operation and maintenance costs and alleviate the burden of system operation.

[0039] 6. The present invention provides a coolant circulation purification system for use in nuclear power plants, which can reduce the radiation dose to personnel during resin unloading and curing.

[0040] 7. The coolant circulation purification system provided by the present invention for use in nuclear power plants can reduce the amount of nuclear-grade resin purchased, as well as the costs of solidification, storage, and transportation of solid waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a flow chart of a coolant circulation purification system applied to a nuclear power plant provided by the present invention;

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

[0043] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0044] In the existing technology, the ion exchanger of the primary coolant storage system and the ion exchanger of the primary coolant treatment system are not related. After the ion exchangers of the two systems complete their designed functions in their respective systems, the waste resins are treated as solid radioactive waste. Even if the ion exchangers are not used, they need to be unloaded after being placed for a long time due to resin aging or inspection and maintenance work such as commissioning inspection. After research, it is found that after the primary coolant is purified by the coolant purification system, it is no longer necessary to be purified by the cation exchanger of the primary coolant storage system. Therefore, the cation exchanger is not often used. Moreover, the anion exchanger of the primary coolant storage system absorbs low-concentration boric acid to saturate at the end of the reactor life. After it can no longer absorb boric acid, it can still absorb SO4 2- , NO3 - , Cl - Anions such as cation exchangers are suitable for reuse; however, the cation exchangers and anion exchangers in the primary coolant treatment system are frequently used, and the resins are frequently replaced, resulting in a large amount of solid radioactive waste.

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

[0046] like Figure 1 As shown, the present invention provides a coolant circulation purification system for use in 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 sequentially connected in series.

[0048] In one embodiment, a primary coolant treatment system cation exchanger inlet valve 13, a primary coolant treatment system cation exchanger outlet valve 15, and a primary coolant treatment system anion exchanger outlet valve 17 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. 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 collector 18 are sequentially 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 collector 12 are sequentially connected in series.

[0050] In one embodiment, a primary coolant storage system cation exchanger inlet valve 1, a primary coolant storage system cation exchanger outlet valve 4, and a primary coolant storage system anion exchanger outlet valve 11 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. 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 collector 12 are sequentially connected in series.

[0051] In one specific embodiment, a first bypass line and a first bypass valve 3 are provided at the inlet of the cation exchanger 2 of the primary-loop coolant storage system, which are directly connected to the inlet of the anion exchanger 8 of the primary-loop coolant storage system; a second bypass line and a second bypass valve 5 are provided at the outlet of the cation exchanger 2 of the primary-loop coolant storage system, which are directly connected to the resin collector 12 of the primary-loop coolant storage system. The coolant purified by the cation exchanger 2 of the primary-loop coolant storage system can return to the primary loop or be discharged into the coolant storage tank directly through the resin collector 12 of the primary-loop coolant storage system without passing through the anion exchanger 8 of the primary-loop coolant storage system.

[0052] A first inlet valve 6 of the primary coolant storage system anion exchanger is provided at the inlet of the primary coolant storage system anion exchanger 8. The valve is an electric valve used to allow the coolant to bypass the primary coolant storage system cation exchanger 2 and the primary coolant storage system anion exchanger 8 at the same time.

[0053] A second inlet valve 7 of the primary coolant storage system anion exchanger is provided at the inlet of the primary coolant storage system anion exchanger 8. The valve is a manual valve used for isolation and maintenance when the first inlet valve 6 of the primary coolant storage system anion exchanger 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 used to isolate and repair the primary coolant storage system anion exchanger 10 in the event of a malfunction. The second outlet valve 10 is an electric valve used to isolate the primary coolant storage system anion exchanger 8 during operation.

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

[0056] A fourth bypass is provided before the anion exchanger inlet valve 6 of the primary coolant storage system, and is connected to the anion exchanger 16 of the primary coolant treatment system through the fourth bypass valve 20 .

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

[0058] The present invention provides a coolant circulation purification method for use in a nuclear power plant, which specifically comprises the following steps:

[0059] Step 1: When the total alkali metal content in the primary coolant exceeds the specified level and the reactor purification system cannot control the level, the system operates in Mode 1, where cation exchanger 2 in the primary coolant storage system operates alone to remove alkali metal ions. In Mode 1, valves 1, 5, and 11 are open, while valves 3, 4, 6, 10, 19, 20, and 21 are closed. Cation exchanger 2 and resin collector 12 operate.

[0060] Step 2: After the primary coolant storage system's boric acid concentration is reduced to less than 0.3 g / L at the end of the reactor's life, the system operates in Mode 2, whereby the primary coolant storage system's anion exchanger 8 operates alone to remove the low-concentration boric acid solution from the primary coolant storage system at the end of its life. In Mode 2, valves 3, 6, 7, 9, 10, and 11 are open, while valves 1, 4, 5, 19, 20, and 21 are closed. The anion exchanger 8 and resin collector 12 operate.

[0061] Step 3: In Modes 1 and 2, if the primary boric acid concentration needs to be reduced and the reactor purification system cation bed cannot be controlled, the system operates in Mode 3, in which the primary coolant storage system cation exchanger 2 and the primary coolant storage system anion exchanger 8 operate in conjunction to purify the primary coolant. In Mode 3, valves 1, 4, 6, 7, 9, 10, and 11 are open, while valves 3, 5, 19, 20, and 21 are closed. The cation exchanger 2, anion exchanger 8, and resin collector 12 operate.

[0062] Step 4: When impurity ion levels in the boron-containing water storage system's boron water storage tank, coolant storage system's storage tank, or coolant treatment system's solution exceed standards and require water purification, the system operates in Mode 4, where the primary coolant treatment system's cation exchanger 14 and anion exchanger 16 operate in conjunction to purify the coolant treatment system's water. In Mode 4, valves 13, 15, and 17 are open, while valves 19, 20, and 21 are closed. The cation exchanger 14, anion exchanger 16, and resin collector 18 operate.

[0063] Step 5: When the primary coolant storage system anion exchanger 8 has completed boron removal at the end of its service life and impurity ions need to be purified from the boron-containing water storage system boron water storage tank, the coolant storage system storage tank, or the coolant treatment system solution, the system operates in Mode 5, in which the primary coolant treatment system cation exchanger 14 and the primary coolant storage system anion exchanger 8 operate together to purify the coolant treatment system water. In Mode 5, valves 6, 7, 9, 10, 11, 13, 15, and 20 are open, and valves 3, 4, 5, 17, 19, and 21 are closed. The cation exchanger 14, anion exchanger 8, and resin collector 12 are in operation.

[0064] Step 6: If the primary coolant storage system cation exchanger 2 is scheduled to unload but has not yet completed its unloading, and if purification of impurity ions is required in the boron-containing water storage system boron water tank, the coolant storage system tank, or the coolant treatment system solution, the system operates in Mode 6, in which the primary coolant storage system cation exchanger 2 and the primary coolant treatment system anion exchanger 16 operate in conjunction to purify the coolant treatment system water. In Mode 6, valves 1, 4, 17, and 20 are open, and valves 3, 5, 6, 10, 15, 19, and 21 are closed. The cation exchanger 2, anion exchanger 16, and resin collector 18 are in operation.

[0065] Step 7: When the primary coolant storage system anion exchanger 8 has completed boron removal at the end of its service life, and the primary coolant storage system cation exchanger 2 is scheduled to be unloaded but has not yet completed it, and there is a need to purify impurity ions in the boron-containing water storage system boron water storage tank, the coolant storage system storage tank, or the coolant treatment system solution, the system operates in Mode 7, i.e., the primary coolant storage system cation exchanger 2 and the primary coolant storage system anion exchanger 8 operate together to purify the coolant treatment system water quality. In Mode 7, valves 4, 6, 9, 10, 11, and 19 are open, and valves 1, 3, 5, 13, 20, and 21 are closed. The cation exchanger 2, anion exchanger 8, and resin collector 12 are in operation.

[0066] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A coolant circulation purification system used in nuclear power plants, It is 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 arranged 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 arranged 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 the position after the inlet of the cation exchanger (2) of the primary coolant storage system through the third bypass valve (19).

2. A coolant circulation purification system for a nuclear power plant according to claim 1, It is characterized in that A fourth bypass is provided in front of the inlet of the anion exchanger (8) of the primary coolant storage system, and is connected to the front of the anion exchanger (16) of the primary coolant treatment system through a fourth bypass valve (20).

3. A coolant circulation purification system for a nuclear power plant according to claim 1, It is characterized in that 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).

4. A coolant circulation purification system for a nuclear power plant according to claim 1, It is characterized in that 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).

5. A coolant circulation purification system for a nuclear power plant according to claim 1, It is characterized in that 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).

6. A coolant circulation purification system for a nuclear power plant according to claim 1, It is characterized in that The inlet of the anion exchanger (8) of the primary coolant storage system is provided with a first inlet valve (6) of the anion exchanger of the primary coolant storage system.

7. A coolant circulation purification method for use in a nuclear power plant, It is 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 loop 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 loop 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 jointly to purify the primary circuit coolant; Step 4, when the impurity ion content of the solution in the boron water storage system boron water storage tank, 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) are jointly operated 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 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 (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 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 jointly operate 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 solution in the coolant treatment system, 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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