A kind of measurement method of Core makeup tank boron concentration
阅读说明：本技术 一种堆芯补水箱硼浓度的测量方法 (A kind of measurement method of Core makeup tank boron concentration ) 是由 李德昌 易绍峰 柳文斌 杜常进 孙明明 于 2019-08-26 设计创作，主要内容包括：本发明公开了一种堆芯补水箱硼浓度的测量方法。所述测量方法包括：对所述堆芯补水箱进行一次或多次取样；在每次取样时记录所取样本的体积、所取样本的硼浓度测量值以及一回路冷却剂硼浓度；依据所述堆芯补水箱的容积和每次取样时所记录的所取样本的体积、所取样本的硼浓度测量值以及一回路冷却剂硼浓度得出当次取样时所述堆芯补水箱内的水的硼浓度。通过上述方法得到的硼浓度数值,比实际取样的测量数据更能准确的反应当前堆芯补水箱中水的硼浓度。从而,可在不降低安全裕度的前提下,能够有效减少不必要的调硼次数,进而减少放射性废水的产量,从经济性和环境保护方面均具有较大意义。(The invention discloses a kind of measurement methods of Core makeup tank boron concentration.The measurement method includes: to carry out one or many samplings to the Core makeup tank；The boron concentration measurement and primary Ioops coolant boron concentration that record samples this volume, samples this in every sub-sampling；The volume for sampling this that is recorded when volume and every sub-sampling according to the Core makeup tank, the boron concentration measurement sampled and primary Ioops coolant boron concentration obtain the boron concentration of the water when sub-sampling in the Core makeup tank.By boron concentration values obtained by the above method, the measurement data than actually sampling can accurately more react the boron concentration of water in current Core makeup tank.To can effectively reduce unnecessary tune boron number under the premise of not reducing safety margin, and then reduce the yield of radioactive wastewater, all have greater significance in terms of economy and environmental protection.)
1. a kind of measurement method of Core makeup tank boron concentration, which is characterized in that the measurement method includes the following steps:
One or many samplings are carried out to the Core makeup tank；
In every sub-sampling, it is dense to sample this volume, the boron concentration measurement for sampling this and primary Ioops coolant boron for record Degree；
The volume for sampling this that is recorded when volume and every sub-sampling according to the Core makeup tank, the boron sampled are dense Degree measured value and primary Ioops coolant boron concentration obtain the boron concentration of the water when sub-sampling in the Core makeup tank.
2. the measurement method of Core makeup tank boron concentration according to claim 1, which is characterized in that " the foundation institute The volume for sampling this recorded when stating the volume and every sub-sampling of Core makeup tank, the boron concentration measurement sampled with And primary Ioops coolant boron concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of include:
In the boron concentration and the Core makeup tank of water when according to preceding primary sample in the obtained Core makeup tank Volume obtains the total amount of the boron before current sub-sampling in the Core makeup tank.
3. the measurement method of Core makeup tank boron concentration according to claim 2, which is characterized in that " the foundation institute The volume for sampling this recorded when stating the volume and every sub-sampling of Core makeup tank, the boron concentration measurement sampled with And primary Ioops coolant boron concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of further include:
The boron concentration measurement for sampling this and primary Ioops coolant boron concentration recorded when according to current sub-sampling obtains currently The loss of boron caused by when sub-sampling.
4. the measurement method of Core makeup tank boron concentration according to claim 3, which is characterized in that " the foundation institute The volume for sampling this recorded when stating the volume and every sub-sampling of Core makeup tank, the boron concentration measurement sampled with And primary Ioops coolant boron concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of further include:
According to it is described go out current sub-sampling before boron in the Core makeup tank total amount and when described current sub-sampling make At boron loss obtain current sub-sampling when the Core makeup tank in boron total amount.
5. the measurement method of Core makeup tank boron concentration according to claim 4, which is characterized in that " the foundation institute The volume for sampling this recorded when stating the volume and every sub-sampling of Core makeup tank, the boron concentration measurement sampled with And primary Ioops coolant boron concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of further include:
The total amount of boron when according to the current sub-sampling in the Core makeup tank and the volume of the Core makeup tank obtain The boron concentration of water after current sub-sampling in the Core makeup tank out.
Technical field
The present invention relates to nuclear power plant's detection technique fields, and in particular to a kind of measurement method of Core makeup tank boron concentration.
Background technique
In AP1000 nuclear power plant, there are two identical Core makeup tank (CMT), each water tank total measurement (volume)s in design 70.8m3, specified boron concentration is 3500ppm.When the LOCA accident for equivalent diameter occurs being less than 250mm, Core makeup tank Injection volume is enough to prevent core meltdown in temporary stage.In addition, the high concentration of boric acid solution stored in Core makeup tank can mention For enough negative reactivities to take reactor to subcritical operating condition.Under accidental conditions, Core makeup tank outlet line and Primary Ioops coolant (primary Ioops coolant boron concentration is about 1100ppm when normal operation) isolation, cold section of pressure-equalizing line every It is normally opened from valve PXS-V002A, so that maintaining tank pressure is 15.4MPa.
It is remained in the range of requirement to guarantee and monitor the boron concentration of Core makeup tank, it is desirable that confirm within every 7 days The boron concentration of each Core makeup tank is between 3400-3700ppm.Therefore, at least every 7 days will boron to Core makeup tank it is dense Degree is sampled chemical examination, and sample point is as shown in Figure 1.
So the shortcomings that sampling, is, under current sample method, after Core makeup tank sampling, primary Ioops will be caused cold But the water flow of the low boron concentration of agent system is to Core makeup tank, so that Core makeup tank boron concentration declines.With reactor The boron concentration of the increase of burnup, primary Ioops will be gradually reduced, cause this dilution to Core makeup tank can the end of term in longevity more Obviously.Further, since the nuclear island sampling system of AP1000 shares sampling line, when need to carry out long to Core makeup tank sampling every time Between rinse after could sample.Which increases the amounts that the water of the low boron concentration of primary Ioops enters Core makeup tank, and top is caused to dilute Situation becomes apparent from.Therefore, with the increase of sampling number, the coolant of the low boron concentration of primary Ioops will enter Core makeup tank top Water will be more and more, cause the boron concentration value of sampling and measuring gradually level off to primary Ioops boron concentration and cannot good reactor Mean boron concentrations in core water supply tank.
Moreover, so measured boron concentration of sampling tends not to meet Technical specification requirement, and Core makeup tank It after the boron concentration of sampling is unqualified, is required according to system specification, needs the water by the current low boron concentration of discharge part, then lead to It crosses chemistry and volume system to carry out adjusting boron operation to the dense boron water that Core makeup tank fills into 4375ppm, so that sampling boron concentration energy It meets the requirements.In adjusting boron operation, the boron water discharge of low concentration and filling into for high concentration boron water will cause the increasing of radioactive wastewater Add, increase the amount of Spent Radioactive water process, the service life of wastewater treatment link resin bed will be reduced, increase economic loss and put Penetrating property immobilized waste quantity；On the other hand, treated, and waste water finally arranges the load that surrounding enviroment are increased to environment.
Summary of the invention
The technical problem to be solved by the present invention is to provide a kind of reactor core benefit for above-mentioned problem in the prior art The measurement method of water tank boron concentration can accurately respond Core makeup tank boron concentration, to reduce unnecessary tune boron operation, into And lower the treating capacity of radioactive wastewater, extend the service life of link resin bed, reduces economic loss and radioactivity immobilized waste number Amount.
The technical solution adopted by the present invention to solve the technical problems is: providing a kind of measurement of Core makeup tank boron concentration Method, the measurement method include the following steps:
One or many samplings are carried out to the Core makeup tank；
The boron concentration measurement and primary Ioops coolant that record samples this volume, samples this in every sub-sampling Boron concentration；
The volume for sampling this that is recorded when volume and every sub-sampling according to the Core makeup tank samples Boron concentration measurement and primary Ioops coolant boron concentration obtain the boron concentration of the water when sub-sampling in the Core makeup tank.
By using the method in above-mentioned technical proposal, the available boron for capableing of water in accurate response Core makeup tank The value of concentration, than the boron concentration that the measurement data of traditional practical sampling can accurately more react water in current Core makeup tank. To which unnecessary tune boron number can be effectively reduced, and then reduce Spent Radioactive under the premise of not reducing safety margin The yield of water all has greater significance in terms of economy and environmental protection.
In the measurement method of Core makeup tank boron concentration of the invention, " the appearance according to the Core makeup tank The boron concentration measurement and primary Ioops coolant boron for sampling volume originally, sampling this recorded when long-pending and every sub-sampling Concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of include:
The boron concentration of water when according to preceding primary sample in the obtained Core makeup tank and the Core makeup tank Interior volume obtains the total amount of the boron before current sub-sampling in the Core makeup tank.
In the measurement method of Core makeup tank boron concentration of the invention, " the appearance according to the Core makeup tank The boron concentration measurement and primary Ioops coolant boron for sampling volume originally, sampling this recorded when long-pending and every sub-sampling Concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of further include:
The boron concentration measurement for sampling this and primary Ioops coolant boron concentration recorded when according to current sub-sampling obtains The loss of boron caused by when current sub-sampling.
In the measurement method of Core makeup tank boron concentration of the invention, " the appearance according to the Core makeup tank The boron concentration measurement and primary Ioops coolant boron for sampling volume originally, sampling this recorded when long-pending and every sub-sampling Concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of further include:
Total amount and the current sub-sampling according to the boron in the Core makeup tank before the current sub-sampling out When caused by boron loss obtain the total amount of boron when current sub-sampling in the Core makeup tank.
In the measurement method of Core makeup tank boron concentration of the invention, " the appearance according to the Core makeup tank The boron concentration measurement and primary Ioops coolant boron for sampling volume originally, sampling this recorded when long-pending and every sub-sampling Concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank " the step of further include:
The total amount of boron when according to the current sub-sampling in the Core makeup tank and the appearance of the Core makeup tank Accumulate the boron concentration of the water after obtaining current sub-sampling in the Core makeup tank.
The measurement method for implementing Core makeup tank boron concentration provided by the invention can achieve following the utility model has the advantages that described Measurement method includes the following steps: to carry out one or many samplings to the Core makeup tank；It records and is taken in every sub-sampling The volume of sample, the boron concentration measurement and primary Ioops coolant boron concentration for sampling this；According to the Core makeup tank The boron concentration measurement and primary Ioops coolant for sampling volume originally, sampling this recorded when volume and every sub-sampling Boron concentration obtains the boron concentration of the water when sub-sampling in the Core makeup tank.Pass through boron concentration numbers obtained by the above method Value, the measurement data than actually sampling can accurately more react the boron concentration of water in current Core makeup tank.To not drop Under the premise of lower security nargin, unnecessary tune boron number can be effectively reduced, and then reduce the yield of radioactive wastewater, from warp Greater significance is all had in terms of Ji property and environmental protection.
Detailed description of the invention
Fig. 1 is the schematic diagram being sampled in the present invention to Core makeup tank；
Fig. 2 is the step flow chart of the measurement method of Core makeup tank boron concentration provided by the invention.
Specific embodiment
For a clearer understanding of the technical characteristics, objects and effects of the present invention, now control attached drawing is described in detail A specific embodiment of the invention.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts The every other embodiment obtained, shall fall within the protection scope of the present invention.
The present invention provides a kind of measurement methods of Core makeup tank boron concentration, and referring to fig. 2, the measurement method includes such as Lower step: one or many samplings are carried out to the Core makeup tank；In every sub-sampling, record samples this volume, is taken The boron concentration measurement and primary Ioops coolant boron concentration of sample；When volume and every sub-sampling according to the Core makeup tank The volume for sampling this recorded, the boron concentration measurement for sampling this and primary Ioops coolant boron concentration are obtained to be taken when secondary The boron concentration of water when sample in the Core makeup tank.It is described " when volume and every sub-sampling according to the Core makeup tank The volume for sampling this recorded, the boron concentration measurement for sampling this and primary Ioops coolant boron concentration are obtained to be taken when secondary The step of boron concentration of water when sample in the Core makeup tank " obtained reactor core when including: according to preceding primary sample Volume in the boron concentration and the Core makeup tank of water in water supply tank obtains before current sub-sampling in the Core makeup tank Boron total amount；The boron concentration measurement for sampling this and primary Ioops coolant boron concentration recorded when according to current sub-sampling obtains Out when current sub-sampling caused by boron lose；Total amount according to the boron in the Core makeup tank before the current sub-sampling out With when the current sub-sampling caused by boron loss obtain current sub-sampling when the Core makeup tank in boron total amount；According to The total amount of boron when according to the current sub-sampling in the Core makeup tank and the volume of the Core makeup tank obtain currently The boron concentration of water after sub-sampling in the Core makeup tank.
Specific explanations are as follows:
It samples for the first time:
It is sampled for the first time using the method in background technique, measuring and sampling boron concentration value originally for the first time is C1, sampling Volume is V1, primary Ioops coolant boron concentration is B when sampling1, the volume of Core makeup tank is V.Due to, when sampling for the first time, reactor core The water not pollution by primary Ioops coolant in water supply tank, therefore, the boron concentration value for sampling this is that current reactor core is mended The boron concentration actual value of water in water tank.Therefore, when sampling for the first time, the water boron concentration in Core makeup tank is C1。
It can calculate as a result:
Before sampling for the first time, initial boron amount M in Core makeup tank0=C1×V；
Boron caused by sampling for the first time loses S1=(C1-B1)×V1；
So, the boron amount M after sampling for the first time in Core makeup tank1=M0-S1=C1×V-(C1-B1)×V1；
Boron concentration theoretical value X in Core makeup tank after sampling for the first time as a result,1=[C1×V-(C1-B1)×V1]/V=C1- (C1-B1)×V1/V；
In the above calculating formula,
C1It is available after sampling and measuring for measured value；
B1Primary Ioops boron concentration value when to sample is obtained by power plant's measuring system real-time measurement；
V1It is the amount for needing to record in sampling；
V is fixed value, can be inquired and be obtained by system design manual.
Second sub-sampling:
Second sub-sampling is carried out using the method in background technique, measuring the boron concentration value that second samples this is C2, Sample volume is V2, primary Ioops coolant boron concentration is B when sampling2, the volume of Core makeup tank is V.It can calculate as a result:
Before second sub-sampling, initial boron amount M in Core makeup tank1=X1× V=C1×V-(C1-B1)×V1；
Boron caused by second sub-sampling loses S2=(C2-B2)×V2；
So, the boron amount M after the second sub-sampling in Core makeup tank2=M1-S2=C1×V-(C1-B1)×V1-(C2-B2) ×V2；
Boron concentration theoretical value X in Core makeup tank after second sub-sampling as a result,2=M2/ V=[C1×V-(C1-B1)×V1- (C2-B2)×V2]/V=[C1-(C1-B1)×V1/V]-(C2-B2)×V2/ V=X1-(C2-B2)×V2/V；
In the above calculating formula,
C2It is available after sampling and measuring for measured value；
B2Primary Ioops boron concentration value when to sample is obtained by power plant's measuring system real-time measurement；
V2It is the amount for needing to record in sampling；
V is fixed value, can be inquired and be obtained by system design manual.
When due to the second sub-sampling, cause sample point boron concentration lower after the first sub-sampling, therefore, the boron for sampling this is dense Angle value cannot represent the practical boron concentration of water in current Core makeup tank, the water in Core makeup tank in the second sub-sampling Practical boron concentration should be X2=X1-(C2-B2)×V2/V。
Third sub-sampling:
Third sub-sampling is carried out using the method in background technique, third time is measured and samples this boron concentration value as C3, Sample volume is V3, primary Ioops coolant boron concentration is B when sampling3, the volume of Core makeup tank is V.It can calculate as a result:
Before third sub-sampling, initial boron amount M in Core makeup tank2=X2× V=C1×V-(C1-B1)×V1-(C2-B2)× V2；
Boron caused by third sub-sampling loses S3=(C3-B3)×V3；
So, the boron amount M after third sub-sampling in Core makeup tank3=M2-S3=C1×V-(C1-B1)×V1-(C2-B2) ×V2-(C3-B3)×V3；
Boron concentration theoretical value X in Core makeup tank after third sub-sampling as a result,3=M3/ V=[C1×V-(C1-B1)×V1- (C2-B2)×V2-(C3-B3)×V3]/V=[C1-(C1-B1)×V1/V-(C2-B2)×V2/V]-(C3-B3)×V3/ V=[X1- (C2-B2)×V2/V]-(C3-B3)×V3/ V=X2-(C3-B3)×V3/V；
In the above calculating formula,
C3It is available after sampling and measuring for measured value；
B3Primary Ioops boron concentration value when to sample is obtained by power plant's measuring system real-time measurement；
V3It is the amount for needing to record in sampling；
V is fixed value, can be inquired and be obtained by system design manual.
Likewise, causing sample point boron concentration lower after the second sub-sampling when due to third sub-sampling, therefore, being sampled This boron concentration value cannot represent the practical boron concentration of water in current Core makeup tank, the reactor core moisturizing in third sub-sampling The practical boron concentration of water should be X in case3=X2-(C3-B3)×V3/V。
N-th sampling:
N-th sampling is carried out using the method in background technique, n-th is measured and samples this boron concentration value as Cn, take Sample volume is Vn, primary Ioops coolant boron concentration is B when samplingn, the volume of Core makeup tank is V.It can calculate as a result:
Before n-th sampling, initial boron amount M in Core makeup tankn-1=Xn-1×V；
Boron caused by third sub-sampling loses Sn=(Cn-Bn)×Vn；
So, the boron amount M after third sub-sampling in Core makeup tankn=Mn-1- Sn=Xn-1×V-(Cn-Bn)×Vn；
Boron concentration theoretical value X in Core makeup tank after third sub-sampling as a result,n=Mn/ V=Xn-1-(Cn-Bn)×Vn/V；
In the above calculating formula,
CnIt is available after sampling and measuring for measured value；
BnPrimary Ioops boron concentration value when to sample is obtained by power plant's measuring system real-time measurement；
VnIt is the amount for needing to record in sampling；
V is fixed value, can be inquired and be obtained by system design manual.
Likewise, causing sample point boron concentration lower when due to n-th sampling after the (n-1)th sub-sampling, therefore, being sampled This boron concentration value cannot represent the practical boron concentration of water in current Core makeup tank, the reactor core moisturizing in n-th sampling The practical boron concentration of water should be X in casen=Xn-1-(Cn-Bn)×Vn/V。
As long as in this way, after each sampling accurate recording every sub-sampling when sample this boron concentration measurement, primary Ioops Boron concentration value and the volume for sampling this, the boron concentration that the water in Core makeup tank can be obtained by above method are practical Value.By boron concentration values obtained by the above method, the measurement data than actually sampling can accurately more react current reactor core and mend The boron concentration of Water in Water Tanks.To which unnecessary tune boron can be effectively reduced under the premise of not reducing safety margin Number, and then the yield of radioactive wastewater is reduced, greater significance is all had in terms of economy and environmental protection.
Preferably, in every sub-sampling, the volume of the sample taken every time is all the same, that is, V1=V2=V3=Vn-1= Vn.Because requiring to be rinsed pipeline before every sub-sampling, in order to guarantee the reliability of final result, disappeared to pipe flushing The dosage of water in the Core makeup tank of consumption is also that must record, this makes the result of the measurement method have more reliability.
The embodiment of the present invention is described with above attached drawing, but the invention is not limited to above-mentioned specific Embodiment, the above mentioned embodiment is only schematical, rather than restrictive, those skilled in the art Under the inspiration of the present invention, without breaking away from the scope protected by the purposes and claims of the present invention, it can also make very much Form, all of these belong to the protection of the present invention.
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