Method for restoring boron-10 abundance in boric acid solution of reactor coolant system

Abstract

The present invention relates to the technical field of nuclear auxiliary systems, and discloses a method for restoring the boron-10 abundance of a reactor coolant system boric acid solution, comprising the following steps: judging whether the boric acid solution to be tested reaches a startup recovery condition; if so, obtaining a sample to be tested; analyzing the sample to be tested to obtain sample data; obtaining on-site collection data; calculating based on the sample data and the on-site collection data, obtaining an enriched boric acid mass to be added; making boron according to the enriched boric acid mass to be added, obtaining a boric acid solution to be added; analyzing the boric acid solution to be added, obtaining the boron concentration of the boric acid solution to be added; restoring the boric acid solution of a boric acid solution storage tank according to the boron concentration of the boric acid solution to be added. The present invention gradually increases the boron-10 abundance of the coolant system boric acid solution by re-making boron and adding lithium for water exchange or boronization and power reduction operation in the reactor coolant system during unit operation, reduces the critical boron concentration deviation, and avoids the problem of exceeding the limit value.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear auxiliary systems, and more particularly to a method for recovering the boron-10 abundance of a boric acid solution in a reactor coolant system. Background Art

[0002] The two necessary means of controlling the reaction of nuclear pressurized water reactor units are control rods and boron.

[0003] Boron consists of two companion elements, boron-10 and boron-11. Boron-10 absorbs neutrons, while boron-11 essentially does not. Because boron in the boric acid solution in the primary circuit of a nuclear power plant absorbs neutrons, boron-10 is gradually consumed, resulting in a decrease in boron-10 abundance and, consequently, a decrease in the boron differential value. This necessitates an increase in boron concentration to maintain reactivity equilibrium. This can lead to deviations between the measured and theoretically calculated critical boron concentrations exceeding design criteria during the mid-life of nuclear power plants.

[0004] Currently, existing methods include using a first boric acid solution preparation tank to prepare a natural boric acid aqueous solution to replenish the unit with boron-10, or using a boron recovery system to recover boron for reuse. In the former, the boron-10 abundance of natural boric acid is within a preset range, similar to the boric acid abundance in the unit's reactor coolant system. Once the two are evenly distributed, the boron-10 abundance of the boric acid solution in the reactor coolant system cannot be significantly increased. In the latter, continuous boron recovery causes the boron-10 abundance in the unit to gradually decrease over time, leading to the problem of critical boron concentration exceeding the limit during the unit's lifespan. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system in view of the defects of the prior art.

[0006] The technical solution adopted by the present invention to solve the technical problem is to construct a method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system, comprising the following steps:

[0007] Determine whether the boric acid solution to be tested meets the start-up recovery conditions;

[0008] If yes, obtain the sample to be tested;

[0009] Analyzing the sample to be tested to obtain sample data;

[0010] Obtaining on-site collection data;

[0011] Performing calculation based on the sample data and the field collected data to obtain the mass of enriched boric acid to be added;

[0012] Prepare boron according to the mass of the enriched boric acid to be added to obtain a boric acid solution to be added;

[0013] Analyzing the boric acid solution to be added to obtain the boron concentration of the boric acid solution to be added;

[0014] The boron-10 abundance of the boric acid solution in the boric acid solution storage tank is restored according to the boron concentration of the boric acid solution to be added.

[0015] In the method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system of the present invention, the start-up recovery conditions include: the boron-10 abundance of the boric acid solution in the boric acid solution storage tank is less than the abundance limit;

[0016] Alternatively, the critical boron concentration of the boric acid solution in the reactor coolant system deviates from the critical boron concentration reference value by more than the boron concentration limit.

[0017] In the method for restoring boron-10 abundance in a boric acid solution of a reactor coolant system according to the present invention, the sample to be tested comprises: a boric acid solution stored in a boric acid solution storage tank;

[0018] Analyzing the sample to be tested to obtain sample data includes:

[0019] Diluting the sample to be tested with pure water;

[0020] After the dilution is completed, the concentration is measured to obtain the boron concentration value and the boron-10 abundance value of the sample to be tested;

[0021] The boron concentration value of the sample to be tested and the boron-10 abundance value of the sample to be tested are the sample data.

[0022] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, obtaining on-site data includes:

[0023] Measuring storage data of the boric acid solution in the boric acid solution storage tank to obtain liquid level data of the boric acid solution storage tank;

[0024] Obtaining the boron-10 abundance value of the enriched boric acid to be added;

[0025] The liquid level data and the boron-10 abundance value of the enriched boric acid to be added are the on-site collected data.

[0026] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, the calculation based on the sample data and the field collected data to obtain the mass of enriched boric acid to be added includes:

[0027] The mass of the enriched boric acid to be added is obtained by calculation based on the boron concentration value of the sample to be tested, the boron-10 abundance value of the sample to be tested, the liquid level data, and the boron-10 abundance value of the enriched boric acid to be added.

[0028] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, producing boron according to the mass of the enriched boric acid to be added to obtain the boric acid solution to be added comprises:

[0029] After obtaining the mass of the enriched boric acid to be added, boron is prepared in a first boric acid solution preparation tank to obtain the boric acid solution to be added.

[0030] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added comprises:

[0031] Determining whether the boron concentration of the boric acid solution to be added is within a preset range;

[0032] If so, the boron-10 abundance of the boric acid solution in the boric acid solution storage tank is restored using a preset path.

[0033] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank using a preset path comprises:

[0034] Switch the unit from the boric acid solution storage tank to the standby liquid storage tank for boron supply;

[0035] transferring the boric acid solution to be added in the first boric acid solution preparation tank to the boric acid solution storage tank until the first boric acid solution preparation tank is emptied;

[0036] The boron-10 abundance of the boric acid solution in the boric acid solution storage tank can be restored by replacing water in the primary circuit of the unit or reducing power for boration.

[0037] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added further comprises:

[0038] If the boron concentration of the boric acid solution to be added is not within the preset range;

[0039] comparing the boron concentration of the boric acid solution to be added with a lower limit value;

[0040] If the boron concentration of the boric acid solution to be added is less than the lower limit, natural boric acid is added to the boric acid solution to be added to adjust the boron concentration of the boric acid solution to be added until the boron concentration of the boric acid solution to be added is within the preset range.

[0041] In the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added further comprises:

[0042] If the boron concentration of the boric acid solution to be added is not within the preset range;

[0043] comparing the boron concentration of the boric acid solution to be added with an upper limit value;

[0044] If the boron concentration of the boric acid solution to be added is greater than the upper limit, the boric acid solution to be added is diluted to adjust the boron concentration of the boric acid solution to be added until the boron concentration of the boric acid solution to be added is within the preset range.

[0045] The method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system according to the present invention has the following beneficial effects: it comprises the following steps: determining whether the boric acid solution to be tested meets the start-up recovery conditions; if so, obtaining a sample to be tested; analyzing the sample to be tested to obtain sample data; obtaining field-collected data; calculating based on the sample data and field-collected data to obtain the mass of enriched boric acid to be added; producing boron according to the mass of enriched boric acid to be added to obtain a boric acid solution to be added; analyzing the boric acid solution to be added to obtain the boron concentration of the boric acid solution to be added; and restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added. The method gradually increases the boron-10 abundance of the boric acid solution in the coolant system by reproducing boron and, by using the reactor coolant system in operation to add lithium for water exchange or to reduce power during boronization, reduces the critical boron concentration deviation, and avoids the problem of exceeding the limit. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which:

[0047] Figure 1 1 is a flow chart of a first embodiment of a method for restoring boron-10 abundance in a boric acid solution of a reactor coolant system provided by the present invention;

[0048] Figure 2 This is a schematic flow chart of Example 2 of the method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system provided by the present invention;

[0049] Figure 3 This is a calculation flow chart of the single water change limit provided by the present invention;

[0050] Figure 4 3. It is a graph showing the trend of the critical boron concentration deviation after the enriched boric acid is added according to the embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to have a clearer understanding of the technical features, purposes and effects of the present invention, specific embodiments of the present invention are now described in detail with reference to the accompanying drawings.

[0052] refer to Figure 1 , which is a flow chart of an optional embodiment of a method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system provided by the present invention.

[0053] like Figure 1 As shown, the method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system comprises the following steps:

[0054] Step S101: determine whether the boric acid solution to be tested meets the start-up recovery condition.

[0055] Optionally, in an embodiment of the present invention, the startup recovery condition includes: the boron-10 abundance of the boric acid solution in the boric acid solution storage tank is less than the abundance limit; or, the deviation between the critical boron concentration of the boric acid solution in the reactor coolant system and the critical boron concentration reference value is greater than the boron concentration limit.

[0056] Specifically, when the boron-10 abundance in the boric acid solution storage tank or the standby liquid storage tank is less than the abundance limit, or the deviation between the critical boron concentration of the boric acid solution in the reactor coolant system and the critical boron concentration reference value is greater than the boron concentration value, the startup recovery condition is met. That is, at this time, the boron-10 abundance of the boric acid solution in the reactor coolant system needs to be restored to increase the boron-10 abundance of the boric acid solution in the reactor coolant system and avoid the problem of critical boron concentration deviation exceeding the limit during the life cycle.

[0057] Optionally, in an embodiment of the present invention, the abundance limit may be 19.8%. The boron concentration limit may be 30 ppm. That is, when the boron-10 abundance in the boric acid solution storage tank or the reserve solution storage tank is less than 19.8%, or when the critical boron concentration of the boric acid solution in the reactor coolant system deviates from the critical boron concentration reference value by more than 30 ppm, restoration of the boron-10 abundance in the boric acid solution in the reactor coolant system is initiated.

[0058] In the embodiment of the present invention, in order to control the boron-10 abundance in the reactor boron and water supply system and the reactor coolant system, the monitoring frequency and range of the boron-10 abundance and the critical boron concentration deviation are set, as shown in the following table:

[0059]

[0060] Among them, REA004BA is the boric acid solution storage tank, REA003BA is the spare liquid storage tank, and RCP is the reactor coolant system.

[0061] Step S102: If yes, obtain the sample to be tested.

[0062] Specifically, the sample to be tested includes: a boric acid solution stored in a boric acid solution storage box.

[0063] Step S103: Analyze the sample to be tested to obtain sample data.

[0064] In some embodiments, analyzing the sample to be tested and obtaining sample data includes: diluting the sample to be tested with pure water (wherein, pure water is water that has been deoxygenated and desalinated); performing concentration measurement after the dilution is completed to obtain the boron concentration value of the sample to be tested and the boron-10 abundance value of the sample to be tested; the boron concentration value of the sample to be tested and the boron-10 abundance value of the sample to be tested are sample data.

[0065] Specifically, when using pure water to dilute the sample to be tested, the concentration of the sample to be tested needs to be diluted to 10-50 ppb. After dilution to 10-50 ppb, the boron concentration value and the boron-10 abundance value of the sample to be tested are measured. The boron concentration and the boron-10 abundance value of the sample to be tested can be expressed as: CB REA and B REA .

[0066] Step S104: Acquire on-site collected data.

[0067] In some embodiments, obtaining the field-collected data includes: measuring the storage data of the boric acid solution in the boric acid solution storage tank to obtain liquid level data of the boric acid solution storage tank; and obtaining the boron-10 abundance value of the enriched boric acid to be added. The liquid level data and the boron-10 abundance value of the enriched boric acid to be added are the field-collected data.

[0068] Step S105: Calculate based on the sample data and the field collected data to obtain the mass of the enriched boric acid to be added.

[0069] In some embodiments, the mass of enriched boric acid to be added is obtained by performing calculations based on sample data and field-collected data, including: performing calculations based on the boron concentration value of the sample to be tested, the boron-10 abundance value of the sample to be tested, the liquid level data, and the boron-10 abundance value of the enriched boric acid to be added to obtain the mass of enriched boric acid to be added.

[0070] Specifically, the liquid level data can be expressed as: H, and the boron-10 abundance value of the enriched boric acid can be expressed as: B RICH , the mass of enriched boric acid to be added (set as m) can be calculated according to the following process:

[0071] Assume that the boric acid solution storage tank is a tank with an ellipsoidal bottom and a cylindrical rest. Assume that the area of ​​the central circle is S and the volume when full is V. 满 , the corresponding full liquid level is H 满 , so the corresponding relationship between the liquid level H and the liquid volume V of REA004BA is as follows:

[0072] V=V 满 +S*(H—H 满 )(Liquid density is 1000KG / m 3 ) (1).

[0073] Since the enriched boric acid to be added is to make the boron 10 abundance of REA004BA become 20.0%, therefore, formula (2) is satisfied.

[0074]

[0075] By back-calculating (2), the mass m of enriched boric acid required to be added to the boric acid solution preparation box for boron production can be obtained.

[0076] Step S106: Prepare boron according to the mass of the enriched boric acid to be added to obtain a boric acid solution to be added.

[0077] In some embodiments, boron is produced according to the mass of enriched boric acid to be added to obtain the boric acid solution to be added, which includes: after obtaining the mass of enriched boric acid to be added, boron is produced in a first boric acid solution preparation box to obtain the boric acid solution to be added.

[0078] Step S107: Analyze the boric acid solution to be added to obtain the boron concentration of the boric acid solution to be added.

[0079] Optionally, in an embodiment of the present invention, the boric acid solution to be added is analyzed, and the boron concentration of the boric acid solution to be added can be obtained by sampling and measuring the boric acid solution to be added. The measurement method used can be an existing conventional boron concentration measurement method, which is not specifically limited in the present invention.

[0080] Step S108: Restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added.

[0081] Optionally, in some embodiments, as Figure 2 As shown, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added comprises:

[0082] Step S201: determining whether the boron concentration of the boric acid solution to be added is within a preset range;

[0083] Step S202: If yes, restore the boron-10 abundance of the boric acid solution in the boric acid solution storage tank using a preset path.

[0084] Optionally, in an embodiment of the present invention, the preset range may be 7000 to 7700 ppm.

[0085] In some embodiments, such as Figure 2 As shown, when the boron concentration of the boric acid solution to be added is not within the preset range, dilution or natural boric acid is added to adjust the boron concentration. Figure 2 The following may be included:

[0086] Step S203: When the boron concentration of the boric acid solution to be added is less than the lower limit, natural boric acid is added to the boric acid solution preparation tank to increase the boron concentration. After completion, the boron concentration is tested again until the boron concentration of the boric acid solution to be added is within the preset range.

[0087] Step S204: When the boron concentration of the boric acid solution to be added is greater than the upper limit, water is added to the boric acid solution preparation tank to dilute it so as to reduce the boron concentration. After completion, the boron concentration is tested again until the boron concentration of the boric acid solution to be added is within the preset range.

[0088] Specifically, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added also includes: if the boron concentration of the boric acid solution to be added is not within a preset range; comparing the boron concentration of the boric acid solution to be added with a lower limit value; if the boron concentration of the boric acid solution to be added is less than the lower limit value, adding natural boric acid to the boric acid solution to be added to adjust the boron concentration of the boric acid solution to be added, until the boron concentration of the boric acid solution to be added is within the preset range.

[0089] For example, if the boron concentration of the boric acid solution to be added is CB, if CB is less than 7000ppm, then according to the volume V of the boric acid solution prepared in the boric acid solution preparation box, 体m 3 , calculate the mass Mkg of natural boric acid added. The target boron concentration is 7400ppm. This can be calculated using the following formula:

[0090] M=1000*V 体 (7400-CB)*0.000001*61.83 / 10.83 (3).

[0091] Alternatively, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added further includes: if the boron concentration of the boric acid solution to be added is not within a preset range; comparing the boron concentration of the boric acid solution to be added with an upper limit value; if the boron concentration of the boric acid solution to be added is greater than the upper limit value, diluting the boric acid solution to be added to adjust the boron concentration of the boric acid solution to be added until the boron concentration of the boric acid solution to be added is within the preset range.

[0092] For example, if the boron concentration of the boric acid solution to be added is CB, if CB is greater than 7700ppm, according to the volume V of the boric acid solution prepared in the boric acid solution preparation box, 体 m 3 Calculate the mass of added natural boric acid L m 3 The target boron concentration is 7400 ppm. It can be calculated according to the following formula:

[0093] L = V*(CB-7400) / 7400 (4).

[0094] In some embodiments, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank using a preset path includes: switching the unit from the boric acid solution storage tank to the standby liquid storage tank for boron supply; transferring the boric acid solution to be added in the first boric acid solution preparation tank to the boric acid solution storage tank until the first boric acid solution preparation tank is emptied; and restoring the boron-10 abundance of the boric acid solution in the reactor coolant system by changing water in the first circuit of the unit or reducing power for boration.

[0095] Specifically, when the water in the first circuit of the unit is changed, a small amount of negative reactivity will be introduced into the core. The boron-10 abundance in the boric acid solution storage tank is at a relatively high level (about 20.0%) in the initial stage of recovery. Therefore, when the amount of water changed is large, it will cause the core to be overcooled. In an embodiment of the present invention, in order to avoid this problem, the present invention sets a single water change amount limit for the water change in the first circuit of the unit. Among them, when the total amount of water changed is greater than the single water change amount limit, the water is changed in multiple times. Optionally, in an embodiment of the present invention, the interval between two water changes can be set to 30 minutes or more.

[0096] Optionally, in an embodiment of the present invention, the single water exchange amount limit can be calculated by the following method:

[0097] Step S301: Calculate the core burnup, moderator temperature coefficient (MTC), and boron differential value (BDV) corresponding to the boron-10 abundance in the boric acid solution storage tank when the boron-10 abundance is restored.

[0098] Among them, the above-mentioned core burnup, moderator temperature coefficient MTC under full power state, and boron differential value BDV can be directly calculated using nuclear power core physics calculation software.

[0099] Step S302: Measure the boron-10 abundance A in the boric acid solution storage tank. REA MES and primary boron-10 abundance A RCP MES , measure the critical boron concentration CB of the primary circuit cri MES .

[0100] Step S303: Limiting water exchange to cause a circuit to be subcooled by no more than 0.25°C. The corresponding amount of negative reactivity introduced is: p = 0.25*MTC. That is, the amount of negative reactivity introduced is determined when the circuit is subcooled by no more than 0.25°C.

[0101] Among them, the negative reactivity introduced is converted into the change of boron concentration in one circuit: △CB=p / BDV

[0102] Step S304: Calculate the boron-10 abundance in the primary circuit after water exchange based on the change in boron concentration in the primary circuit:

[0103] A RCP cal =A RCP MES *CB cri MES / (CB cri MES -△CB).

[0104] Step S305: Calculate the single water change limit (Q):

[0105] Q=202*LN((A REA MES -A RCP MES ) / (A REA MES -A RCP cal )).

[0106] In a specific embodiment, the embodiment of the present invention restores the boron-10 abundance of the boric acid solution in the coolant system as follows:

[0107] The first step is to measure the boron-10 abundance and boron concentration of REA004BA.

[0108] The second step is to calculate the mass of enriched boric acid to be added based on the liquid level, volume, boron-10 abundance value and boron concentration value of REA004BA, stop supplying boron from REA004BA, and supply boron to the unit from REA003BA.

[0109] The third step is to prepare 7000-7700 ppm of enriched boric acid through REA005BA. After passing the test, the prepared boric acid solution is injected into REA004BA.

[0110] Step 4: Detect the boron-10 abundance of the boric acid solution in REA004BA. If it meets the requirement of less than 20.2%, resume REA004BA to supply boric acid solution to the unit.

[0111] Step 5: By using the primary water exchange in the daily operation of the unit or the occasional boron reduction operation, the boron-10 abundance of the RCT can be gradually increased in small amounts and multiple times to restore it to around the natural abundance of 19.8%.

[0112] After the RCP boron-10 abundance recovery was performed using the present invention, the critical boron concentration deviation variation trend of a nuclear power plant unit A was as follows: Figure 4 As shown. Figure 4 It can be clearly seen that the critical boron concentration can be effectively reduced, effectively avoiding the problem of exceeding the design standard (i.e. 50ppm).

[0113] The present invention increases the boron-10 abundance of REA004BA (approximately 20%). By leveraging the RCP lithium addition and water exchange during daily operation and occasional boronization and power reduction, the RCP boron-10 abundance is gradually increased in small, repeated increments to restore it to approximately the natural abundance of 19.8%. This reduces deviations in critical boron concentration and prevents it from exceeding design criteria. The entire process is a gradual improvement, avoiding transient effects caused by the addition of large amounts of highly enriched boric acid and ensuring a safe core margin.

[0114] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0115] Professionals may further appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the components and steps of each example according to their functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present invention.

[0116] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein may be implemented directly using hardware, a software module executed by a processor, or a combination of the two. The software module may be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.

[0117] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. All equivalent variations and modifications within the scope of the claims of the present invention are intended to be covered by the claims of the present invention.

Claims

1. A method for restoring the boron-10 abundance of a boric acid solution in a reactor coolant system, characterized in that: The following steps are involved: Determine whether the boric acid solution to be tested meets the start-up recovery conditions; The startup recovery conditions include: the boron-10 abundance of the boric acid solution in the boric acid solution storage tank is less than the abundance limit; or the deviation between the critical boron concentration of the boric acid solution in the reactor coolant system and the critical boron concentration reference value is greater than the boron concentration limit; If yes, obtain the sample to be tested; Analyzing the sample to be tested to obtain sample data; Obtaining on-site collection data; Performing calculation based on the sample data and the field collected data to obtain the mass of enriched boric acid to be added; Prepare boron according to the mass of the enriched boric acid to be added to obtain a boric acid solution to be added; Analyzing the boric acid solution to be added to obtain the boron concentration of the boric acid solution to be added; Restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added; restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank based on lithium addition and water replacement or boration reduction function operation of the reactor coolant system during daily operation of the unit; The method of restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added includes: judging whether the boron concentration of the boric acid solution to be added is within a preset range; if so, restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank using a preset path; the method of restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank using the preset path includes: switching the unit from the boric acid solution storage tank to the standby liquid storage tank for boron supply; transferring the boric acid solution to be added in the first boric acid solution preparation tank to the boric acid solution storage tank until the first boric acid solution preparation tank is emptied; and restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank by changing water in the first circuit of the unit or reducing power for boration.

2. The method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system according to claim 1, characterized in that: The sample to be tested includes: a boric acid solution stored in a boric acid solution storage tank; Analyzing the sample to be tested to obtain sample data includes: Diluting the sample to be tested with pure water; After the dilution is completed, the concentration is measured to obtain the boron concentration value and the boron-10 abundance value of the sample to be tested; The boron concentration value of the sample to be tested and the boron-10 abundance value of the sample to be tested are the sample data.

3. The method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system according to claim 2, characterized in that: The acquisition of on-site data includes: Measuring storage data of the boric acid solution in the boric acid solution storage tank to obtain liquid level data of the boric acid solution storage tank; Obtaining the boron-10 abundance value of the enriched boric acid to be added; The liquid level data and the boron-10 abundance value of the enriched boric acid to be added are the on-site collected data.

4. The method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system according to claim 3, characterized in that: The calculating based on the sample data and the field collected data to obtain the mass of the enriched boric acid to be added comprises: The mass of the enriched boric acid to be added is obtained by calculation based on the boron concentration value of the sample to be tested, the boron-10 abundance value of the sample to be tested, the liquid level data, and the boron-10 abundance value of the enriched boric acid to be added.

5. The method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system according to claim 1, characterized in that: The step of preparing boron according to the mass of the enriched boric acid to be added to obtain the boric acid solution to be added comprises: After obtaining the mass of the enriched boric acid to be added, boron is prepared in a first boric acid solution preparation tank to obtain the boric acid solution to be added.

6. The method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system according to claim 1, characterized in that: The method of restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added further comprises: If the boron concentration of the boric acid solution to be added is not within the preset range; comparing the boron concentration of the boric acid solution to be added with a lower limit value; If the boron concentration of the boric acid solution to be added is less than the lower limit, natural boric acid is added to the boric acid solution to be added to adjust the boron concentration of the boric acid solution to be added until the boron concentration of the boric acid solution to be added is within the preset range.

7. The method for restoring the boron-10 abundance of the boric acid solution in the reactor coolant system according to claim 1, characterized in that: The method of restoring the boron-10 abundance of the boric acid solution in the boric acid solution storage tank according to the boron concentration of the boric acid solution to be added further comprises: If the boron concentration of the boric acid solution to be added is not within the preset range; comparing the boron concentration of the boric acid solution to be added with an upper limit value; If the boron concentration of the boric acid solution to be added is greater than the upper limit, the boric acid solution to be added is diluted to adjust the boron concentration of the boric acid solution to be added until the boron concentration of the boric acid solution to be added is within the preset range.

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