CN103680650B - Boron concentration meter for nuclear power station and scaling method thereof - Google Patents
Boron concentration meter for nuclear power station and scaling method thereof Download PDFInfo
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- CN103680650B CN103680650B CN201310692674.8A CN201310692674A CN103680650B CN 103680650 B CN103680650 B CN 103680650B CN 201310692674 A CN201310692674 A CN 201310692674A CN 103680650 B CN103680650 B CN 103680650B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses boron concentration meter for nuclear power station and scaling method thereof.Boron densimeter sniffer feature is: on lower earial drainage water monitoring branch road, get one section of pipe for " stopple coupon ", make water monitoring branch road to be measured and the shared pipeline section demarcating loop, realize " stopple coupon " by the switching of its two ends threeway branch road operation valve and be communicated with online with demarcation loop.Be benchmark with chemical titration, complete the demarcation to boron densimeter.Be transformed into after demarcation on monitoring branch road primary Ioops water boron density real-time monitoring.Measurement mechanism adopts linear mathematical model piecewise fitting to set up measurement relation, improves measuring accuracy.The online instant standardization set up, eliminates and measures drift, revise measuring error.Apparatus structure is simple, measuring method accurately and reliably, processing ease, scaling method successfully solve and pass boron densimeter measuring error in time and increase the technical matters being difficult to overcome produced, and realizes the online accurately monitoring continuously to primary Ioops water boron concentration.
Description
Technical field
The present invention relates to the boron densimeter of one loop of nuclear power station water boron concentration on-line continuous monitoring, and scaling method.
Background technology
Existing pressurized-water reactor nuclear power plant, is typically employed in primary Ioops water and adds boric acid, by the reactivity of regulable control rod with boron concentration cooperation control reactor.Cause for preventing boron concentration excess dilution losing negative reactivity and the accident of the heap power that induces reaction increases, every platform unit of nuclear power station needs outfit boron concentration monitoring device, to ensure reactor operation, to open the safety of heap and shutdown.Boron concentration sniffer is the core component of boron densimeter.
Boron densimeter is the character utilizing boron-10 neutron-absorption cross-section large, adopts the boron concentration sniffer that neutron absorption method is made, then mixes corresponding measurement mechanism, complete the monitoring to boron concentration in one loop of nuclear power station water.
At present, in nuclear power station, more apply the sniffer of band sampling container.Neutron source and neutron detector is placed respectively in sampling container groove.Neutron detector receives the neutron through boron water layer, and the pulse signal that measurement mechanism acquisition process neutron detector sends, calculates, demonstrate measurement result or send alerting signal.
Another kind of sniffer, is that neutron source and neutron detector are made two assemblies, is coated on the pipeline of the tested current of primary Ioops.Because tested water temperature is higher, pipeline appearance need wrap up layer of insulation material.Pass into air in the circular passage of thermal insulation material and two inter-modules to cool.
Another two assembly sniffer, its tested water is the water at low temperature of earial drainage under primary Ioops, does not use thermal insulation material and air cooling, uses dineutron detector.The spy of this two assemblies is surveyed Installed and is put, and needs to use simulation pipeline to demarcate, and dismantles two assemblies attach it on tested pipeline again after demarcation from simulation pipeline.
Above-mentioned Tan Ce Installed puts exists following shortcoming:
1) on sampling container, design machined grooves makes processing technology become complicated.Primary Ioops water enters flows decrease after sampling container, Fu Erosion product and fission product in the easy connate water of container inner wall.
2), the Tan Ce Installed of two assemblies puts and will use thermal insulation material and air cooling, and cause complex structure, measurement environment is stable not; After the enterprising rower of simulation pipeline is fixed, dismounting is re-fitted on true tested pipeline again, it is the conduct of taboo for " demarcation ", because simulation pipeline and true tested pipeline also exist the systematic error that machine work produces, dismounting refitting is difficult to the consistance ensureing to demarcate front and back state, thus have impact on the validity of demarcation and reduce the accuracy of measurement; The transfer of neutron source and installation operation by primary coolant circuit pipe are safely very disadvantageous to the radiation protection of staff.
No matter be that the boron concentration Tan Ce Installed that sampling container type or two assembly cladding types form puts, the boron densimeter measuring instrument used, passing in time can produce the measurement drift that can not be ignored, especially to the later stage of a fuel recycle, boron concentration value shown by boron densimeter instrument and deviate from the mathematical of timing signal between neutron pulse counting rate, therefore as the boron densimeter instrument that monitoring uses, can not reflect the real content of boron concentration in loop, even not have the monitoring effect to Loop Water.At present, there is no solution to the measurement drifting problem of online boron densimeter instrument, online boron densimeter instrument performs practically no function when error is large, and the boron concentration in Loop Water can only rely on chemical titration analysis to measure.Chemical titration analysis manually carries out, and cannot realize on-line continuous Real-Time Monitoring.
Summary of the invention
The object of the invention is to: provide that a kind of structure is simple, response fast, may be implemented in that line is demarcated, measured accurately, the boron densimeter of monitoring continuously and scaling method thereof.
Realize the object of the invention and adopt following technical proposals:
Boron concentration meter for nuclear power station, the boron density monitoring system be made up of sniffer, measurement mechanism and caliberating device, is characterized in that:
Described sniffer:
On the lower earial drainage water monitoring branch road pipeline section of one loop of nuclear power station water after reducing temperature twice step-down, with Stainless Steel Shell packaging closures one section of vertical pipeline section; Using the vertical pipeline section of monitoring branch road that is enclosed in this housing as " stopple coupon "; The both sides of " stopple coupon " in this Stainless Steel Shell, corresponding neutron source and neutron detector are housed, and the pipe shaft of neutron detector is parallel with " stopple coupon ", and neutron detector is connected on the prime amplifier of measurement mechanism by coaxial shielded cable; Remaining space in Stainless Steel Shell fills shielding medium polyethylene material, makes surface of shell reach the radiation dose requirement of shelter of regulation; The upper/lower terminal stretching out Stainless Steel Shell at " stopple coupon " is respectively equipped with a three-way connection, and another two branch roads of each three-way connection are respectively equipped with operation valve; Temperature sensor is fixed on the outer tube wall of " stopple coupon " upper port by clip, is connected with temperature transmitter by three-wire system shielded cable, the sample coolant-temperature gage signal of collection is sent to measurement mechanism main frame and processes;
Neutron source in described sniffer, intensity is 1 ~ 3 Curie, be fixed in supporting component, this supporting component from the reserved notch of sniffer Stainless Steel Shell one middle side part, can insert in Stainless Steel Shell according to horizontal direction and makes neutron source near " stopple coupon ".
Described measurement mechanism:
The measurement mechanism coordinated with sniffer, is made up of prime amplifier, temperature transmitter, main frame, printer and each parts of long-range show case.
Main frame is instrument on the spot, its back embedding low-tension supply template, high-voltage power supply template, controller template, master put examination/chronoscope digital-to-analogue plate, temperature Bian collection/each plug-in unit of analog output template, and there are display screen, warning and status indicator lamp and operation keyboard in its front end; Rack on the spot inserted by main frame and printer;
The low-tension supply template of main frame, the constant voltage DC providing other unit several to use and alternating voltage;
The high-voltage power supply template of main frame, its self-excited oscillator produces alternating voltage, exports high direct voltage to prime amplifier, at this more after filtering, carry this high pressure to neutron detector, for its work by coaxial shielded cable after multiplying rectifier; Meanwhile, the pulse signal that neutron detector sends is transported to prime amplifier again and carries out one-level amplification by coaxial shielded cable, then is transported to and main puts examination/chronoscope digital-to-analogue plate;
Main put examinations/chronoscope digital-to-analogue plate, the pulse signal that prime amplifier amplifies will be received, screen module carry out secondary amplification, shaping by its main putting, and compare with the threshold value that D/A modular converter is arranged and screened, cancelling noise signal; Completed the statistics of step-by-step counting at the appointed time by its timing counting module, through I/O interface, be transported to controller template by " BUS " bus;
Water temperature in temperature sensor measurement " stopple coupon ", the TWS signal that temperature sensor records by temperature transmitter is converted to temperature acquisition/analog output template that direct current DC4-20mA is delivered to main frame;
Temperature acquisition/analog output the template of main frame, its temperature collect module by Bian collection to TWS signal to be transported to the controller template of main frame by " BUS " bus;
The controller template of main frame, controls collection signal, process data, display result, administrative alert, keyboard is with printing and is connected long-range show case with network service;
Controller template, receive and main put the pulse counting signal and TWS signal that examinations/chronoscope digital-to-analogue plate and temperature acquisition/analog output template export, its CPU (central processing unit), by data processor, by the water sample boron concentration C of timing signal acquisition
bpulsimeter digit rate P/S corresponding with it, linearly mathematical model C
b=A+B(P/S)
-1matching is carried out in segmentation, and calibration coefficient A, B of obtaining each section are stored; What store also has temperature correction coefficient simultaneously; During measurement, according to the pulsimeter digit rate value obtained and the calibration coefficient of being suitable for, boron concentration can be calculated; According to the deviation of reference temperature of actual measurement TWS and timing signal, utilize temperature correction coefficient in addition compensating approach, obtain final boron concentration measurement;
Temperature acquisition/analog output the template of main frame, boron concentration measurement is converted to analog current or analog voltage by its analog output module, for nuclear power station relevant device;
The display screen of main frame on the spot can observe directly the boron concentration measurement of numerical monitor, the in the recent period time dependent rolling curve of boron concentration measurement and surveying work parameter that some are main, numerical value as water temperature, counting rate, high pressure, discrimination threshold.Operation keyboard can carry out demarcation matching, confirm calibration coefficient; Arrange or revise various alarm limits and parameter; Control to print;
In order to whether the work of check measurement device is normal, instrument and long-range show case all have self-checking function on the spot, can start " self-inspection " and perform self-inspection to measuring system;
According to the alarm threshold value of setting, under abnormal conditions, long-range display and instrument on the spot send warning message, and power station staff can be tackled in time;
Described caliberating device:
The caliberating device coordinated with sniffer, is taken into account each section of connecting hose formed by boron water tank, electric heater, temperature-controlled cabinet, electric mixer, liquid level sensor, magnetic force ebullator, flow control valve, flow.
Wherein: on boron tank upper cover, be provided with temperature-controlled cabinet, liquid return hole joint and agitator motor, bottom in boron water tank settles electric heater, suitable position to settle electric mixer, liquid level sensor inserts appropriate depth, the parts surface contacted with water in boron water tank is stainless steel, and boron tank inner wall establishes stainless steel liquid level rule; Boron water tank bottom establishes liquid outlet joint and emptying/sample valve; Boron water tank liquid outlet joint connects the entrance of magnetic force ebullator with flexible pipe, the liquid outlet of magnetic force ebullator is by flexible pipe connection traffic variable valve, connect flow control valve liquid outlet by flexible pipe connection traffic meter, the delivery outlet of flowmeter is connected to by flexible pipe on a branch road of " stopple coupon " lower end threeway in sniffer; Liquid return hole joint above boron tank upper cover, is connected on a branch road of " stopple coupon " upper end threeway in sniffer by flexible pipe; So, boron concentration calibration loop is constituted by boron water tank, electric heater (15), temperature-controlled cabinet (13), electric mixer, liquid level sensor, magnetic force ebullator, flow control valve, flowmeter, " stopple coupon " and each section of connecting hose;
" stopple coupon " namely becomes the shared pipeline section demarcating lower earial drainage water monitoring branch road in loop and sniffer, by "ON" or the "Off" of operation valve on " stopple coupon " two ends threeway branch road, can realize demarcating loop and be connected with the conversion of lower earial drainage water monitoring branch road;
Timing signal, closes valve threeway being connected water quality monitoring branch road, opens the valve connecting caliberating device, namely opens and demarcates loop.
To the scaling method of boron concentration, Bian demarcates two kinds with conventional demarcation with instant online.
Conventional scaling method, step is as follows:
1), " stopple coupon " in sniffer A is connected demarcation loop;
2), with deionized water string wash " stopple coupon ", when boron concentration can be considered zero in water, stop string washing; Notice that first demarcation deionized water string is washed " stopple coupon " and demarcates loop; Sniffer is after using, and only string is washed " stopple coupon ", demarcates loop to avoid polluting;
3) when, being full of deionized water in boron water tank, start magnetic force ebullator to circulate, by flowmeter regulating loop flow in suitable setting value, open the electric heater in boron water tank, controlling heating makes " stopple coupon " interior water temperature reach the reference temperature of setting, protect as mark fixed temperature And and hold Heng temperature, read pulsimeter digit rate P/S value during stable state, as sample-out count value;
4), the boron concentration in boron adjustment water is added by boron water tank, boron water loop circulation is carried out under same traffic and temperature conditions, pulsimeter digit rate P/S value during record stable state, water sampling simultaneously, measure boron concentration in water with chemical titration analysis and complete a calibration measurements, obtain the several right of one group of boron concentration and pulsimeter digit rate;
5), by same method, in boron water tank, progressively add the boron concentration that boron improves Loop Water, complete the measurement of several calibration points of gamut, obtain some numbers pair;
6), these are several right, be divided into some sections by boron concentration, segmentation input measurement device console controller template, its CPU (central processing unit), by data processor, by every section at least two number pair, linearly mathematical model C
b=A+B(P/S)
-1carry out matching, obtain its calibration coefficient and store in a program, for measurement, namely complete and the online routine of boron densimeter is demarcated;
7), after calibration measurements terminates, switch the operation valve on " stopple coupon " two ends threeway branch road, recover " stopple coupon " and the connection of water quality monitoring branch road, realize the Real-Time Monitoring online to reactor-loop water boron concentration.
As time goes on, due to the drift of electronic device, the decay of neutron detector sensitivity, weakening of neutron source strength, and water Zhong Fu Erosion product and fission product are in the impact of the factors such as " stopple coupon " tube wall deposition, boron measurement of concetration error increases gradually, to a fuel recycle later stage, does not even have Real-Time Monitoring effect.
When boron measurement of concetration bigger error, the online instant standardization of Bian, the steps include:
The chemical titration analysis boron concentration value of water sample when 1. current loop being run, with sampling the moment pulsimeter digit rate value as a number pair;
2. the several right of at least one recent known boron concentration value and pulsimeter digit rate value is got;
3. by two groups of numbers to the data processor of input measurement device, by MODEL C
b=A+B(P/S)
-1carry out linear fit, namely obtain up-to-date calibration coefficient, available immediately, have modified and measure drift, achieve the online at-once monitor to reactor-loop water boron concentration, successfully solve a difficult problem for nuclear power station boron measurement of concetration drift.
Outstanding advantages of the present invention is:
Owing to directly getting a pipeline section as " stopple coupon " on reactor-loop water monitoring branch road, be fixed in sniffer, should " stopple coupon " inherently ingredient of earial drainage monitoring branch road under primary Ioops, need not put and separately will put sampling container like that by existing Tan Ce Installed, thus avoid to need because separately putting sampling container to solve-serial complicated processing technique.
And existing two assembly cladding type Tan Ce Installed put, need to use simulation pipeline to demarcate, will disassemble from simulation pipeline after demarcation installs on tested pipeline more again, be difficult to the consistance ensureing to demarcate front and back state like this, the validity that not only have impact on demarcation also greatly reduces the accuracy of measurement.
Boron densimeter of the present invention carries out timing signal not to be needed to simulate pipeline, by the blocked operation of valve on " stopple coupon " two ends threeway branch road, just need only can realize easily being connected with the conversion of caliberating device, directly demarcate.After demarcation completes, " stopple coupon " and caliberating device cut off by switch valve, recover " stopple coupon " and the conducting of monitoring branch road, realize the online boron concentration monitor of boron densimeter.
Online instant standardization of the present invention, in reactor operation process, only need obtain the titrimetry boron concentration value of recent two or more loop water sample and corresponding pulsimeter digit rate number pair, carry out linear fit, up-to-date calibration coefficient can be obtained, complete demarcation, immediately revise drift error.
The present invention demarcates online immediately, does not interrupt monitoring, and operation letter makes, and reliably decreases measuring error.Therefore be not difficult to find out: the present invention not only reduced the number of sniffer structure, reduce the technology difficulty of apparatus design manufacture, simplify measuring method, install simple and safe, processing ease, demarcation accurately and reliably, substantially increase the degree of accuracy of measurement, successfully solve the technical barrier of boron measurement of concetration drift, effectively realize the on-line proving to boron concentration in earial drainage monitoring branch road water under reactor-loop and on-line real time monitoring.
Accompanying drawing explanation
Fig. 1 is sniffer structural representation of the present invention
Fig. 2 is caliberating device system architecture schematic diagram of the present invention
Mark in figure: 1 is the temperature sensor on online " stopple coupon " outer wall, 2 is " stopple coupon " under primary Ioops on earial drainage water monitoring branch road, 2-1 is the threeway of " stopple coupon " upper end, 2-2 is the threeway of " stopple coupon " lower end, 3 is neutron detector, 4 is neutron source, 5 is neutron source supporting component, 6 is the polyethylene material in Stainless Steel Shell, 7 is parcel stopple coupon, the Stainless Steel Shell of neutron source and neutron detector, 8 is Stainless Steel Shell feet, 9 is the prime amplifier of measurement mechanism, 10 is main frame, 11 is long-range show case, 12 is temperature transmitter, 13 is temperature-controlled cabinet, 14 is boron water tank, 15 is electric heater, 16 is emptying/sample valve, 17 is magnetic force ebullator, 18 is flow control valve, 19 is flowmeter, 20, 21 for demarcating two pipelines up and down in loop, 22 is the drive motor of stirrer in boron water tank.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in detail.
The boron densimeter of continuous monitoring one loop of nuclear power station water, the system be made up of sniffer A, measurement mechanism B and caliberating device C.Wherein:
Sniffer is A signature as shown in Figure 1:
On the lower earial drainage water monitoring branch road of one loop of nuclear power station water after reducing temperature twice step-down, get one section of vertical pipeline section and make " stopple coupon "; Centered by this " stopple coupon " 2, " stopple coupon " 2 is closed by axle Stainless Steel Shell 7; In Stainless Steel Shell 7, relative to the side of " stopple coupon " 2, be fixed with neutron detector 3 vertically, it is connected with the prime amplifier 9 of measurement mechanism by the coaxial shielded cable of transmission pulse signal; Relative with this neutron detector 3, at the opposite side of " stopple coupon " 2, the neutron source 4 that intensity is 1 ~ 3 Curie is housed, it is fixed in supporting component 5, by the reserved notch in the middle part of Stainless Steel Shell 7, from horizontal direction, neutron source supporting component 5 is inserted in Stainless Steel Shell 7, make neutron source 4 near stopple coupon 2; Its complementary space in Stainless Steel Shell 7 chamber fills polyethylene material 6; The upper/lower terminal head stretching out Stainless Steel Shell 7 at " stopple coupon " 2 is equipped with threeway 2-1 and 2-2; Temperature sensor 1 by clip be fixed on " stopple coupon " 2 upper port outer tube wall on, be connected with temperature transmitter 12 by three-wire system shielded cable, the sample coolant-temperature gage signal of collection be sent to measurement mechanism and process.Load-bearing fixed support pin 8 is housed in the bottom of Stainless Steel Shell 7.
The measurement mechanism B(coordinated with sniffer A is as shown in Figure 2),
Be made up of prime amplifier, temperature transmitter, main frame, printer and each parts of long-range show case.
Main frame is instrument on the spot; Its back embedding low-tension supply template, high-voltage power supply template, master put examination/chronoscope digital-to-analogue plate, controller template, temperature Bian collection/each plug-in unit of analog output template; There are display screen, alarm condition pilot lamp and operation keyboard in its front end; Main frame and printer are inserted on the spot in rack.
The low-tension supply template of main frame, the constant voltage DC providing other unit several to use and alternating voltage;
The high-voltage power supply template of main frame, its self-excited oscillator produces alternating voltage, exports high direct voltage to prime amplifier, at this more after filtering, carry this high pressure for neutron detector work by coaxial shielded cable after multiplying rectifier; Meanwhile, the pulse signal that neutron detector sends is transported to prime amplifier again and carries out one-level amplification by coaxial shielded cable; This signal is transported to master again and puts examination/chronoscope digital-to-analogue plate, its master puts examination template, by the one-level amp pulse signal amplified via prime amplifier from neutron detector, carry out secondary amplify and be shaped, and compare with the threshold value that D/A modular converter is arranged and screened, cancelling noise signal; Its chronoscope digital-to-analogue plate, completes the statistics of step-by-step counting at the appointed time, through I/O interface, is transported to controller template by " BUS " bus;
Temperature sensor, measures the water temperature in " stopple coupon ";
Temperature transmitter, the temperature signal recorded by temperature sensor, is converted to temperature acquisition/analog output template that direct current DC4-20mA is delivered to main frame;
Temperature acquisition/analog output the template of main frame, the temperature signal collected is transported to controller template by " BUS " bus by its temperature acquisition template;
The controller template of main frame, controls collection signal, process data, display result, administrative alert, keyboard is with printing and is connected long-range show case with network service;
Controller template, receive and main put the pulse counting signal and TWS signal that examinations/chronoscope digital-to-analogue plate and temperature acquisition/analog output template export, its CPU (central processing unit), by data processor, by the water sample boron concentration C of timing signal acquisition
bpulsimeter digit rate P/S corresponding with it, linearly mathematical model C
b=A+B(P/S)
-1matching is carried out in segmentation, and calibration coefficient A, B of obtaining each section are stored; What store also has temperature correction coefficient simultaneously; During measurement, according to the pulsimeter digit rate value obtained and the calibration coefficient of being suitable for, boron concentration can be extrapolated; According to the deviation of reference temperature of actual measurement TWS and timing signal, utilize temperature correction coefficient in addition compensating approach, obtain final boron concentration measurement;
Temperature acquisition/analog output the template of main frame, boron concentration measurement is converted to analog current or analog voltage by its analog output template, exports analog quantity for nuclear power station relevant device;
On the display screen of main frame on the spot, the boron concentration measurement of numerical monitor, the in the recent period time dependent rolling curve of boron concentration measurement and surveying work parameter that some are main can be observed directly, as the numerical value of water temperature, counting rate, high pressure, discrimination threshold; Operation keyboard can carry out demarcation matching, confirm calibration coefficient; Arrange or revise various alarm limits and parameter; Control to print.
In order to whether the work of check measurement device is normal, instrument and long-range show case all have self-checking function can start " self-inspection " to measuring system execution self-inspection on the spot.
According to the alarm threshold value of setting, under abnormal conditions, long-range display and instrument on the spot send warning message, and power station staff can be tackled in time.
Coordinate the caliberating device system C of sniffer A, as shown in Figure 2: be by temperature-controlled cabinet 13, boron water tank 14, electric heater 15, the electric mixer of device in boron water tank and liquid level sensor, magnetic force ebullator 17, flow control valve 18, the demarcation loop of flowmeter 19 and each section of connecting hose composition.
This caliberating device system C, is contained in one and has on double-deck dolly.
Boron water tank 14 is equipped with on dolly upper strata, the bottom of boron water tank 14 arranges liquid outlet joint, emptying/sample valve 16, electric heater 15 is set in boron water tank 14, liquid level sensor and electric mixer are settled in appropriate location, set temperature control box 13, liquid return hole joint and agitator motor 22 on boron water tank 14 top board; Temperature-controlled cabinet 13 panel is arranged: power switch, electric heater switch, electric mixer switch, pilot lamp, display charactron and knob or button, in order to switch on power, opening electric heater 15, start boron water in electric mixer, setting and control boron water tank 14 constant temperature, display boron water tank 14 temperature, send to liquid level in boron water tank 14 is too low report to the police instruction excision electric heater 15 automatically;
Magnetic force ebullator 17 is equipped with in dolly lower floor, the input port of this pump is by the liquid outlet joint bottom flexible pipe connection boron water tank 14, the delivery outlet of magnetic force ebullator 17 is by flexible pipe connection traffic variable valve 18, flow control valve 18 is again by flexible pipe connection traffic meter 19, the delivery outlet of this flowmeter 19 is connected on the branch road of lower end threeway 2-2 of " stopple coupon " 2 in sniffer A by flexible pipe 20, stopple coupon " 2 the branch road of upper end threeway 2-1 be connected to by flexible pipe 21 on the liquid return hole joint at boron water tank 14 top, boron water liquid in boron water tank 14 like this, extracted out by magnetic force ebullator 17, by flexible pipe via flow control valve 18, flowmeter 19, after " stopple coupon " 2 of sniffer A, by flexible pipe 21, the liquid return hole joint reflow at boron water tank 14 top enters boron water tank 14, constitute the demarcation loop of boron water circulation.
Before demarcating, the dolly of caliberating device is moved to reactor-loop lower earial drainage water monitoring after reducing temperature twice step-down and prop up roadside, respectively by demarcating the joint of flexible pipe 21 and 20 in loop, be connected on the branch road of sniffer A " stopple coupon " 2 upper/lower terminal head threeway 2-1 and 2-2.
Timing signal, closedown " stopple coupon " 2 upper/lower terminal head threeway is connected the valve of lower earial drainage water monitoring branch road, " stopple coupon " 2 and former lower earial drainage water monitoring branch road are blocked, opens valve two ends threeway branch road being connected caliberating device, " stopple coupon " 2 and calibration system are formed and demarcates loop.
The scaling method of boron densimeter, is divided into conventional demarcation immediately to demarcate with online.
Conventional scaling method, step is as follows:
1), " stopple coupon " in sniffer A is connected demarcation loop;
2), with deionized water string wash " stopple coupon ", when boron concentration can be considered zero in water, stop string washing; Notice that first demarcation deionized water string is washed " stopple coupon " and demarcates loop; Sniffer is after using, and only string is washed " stopple coupon ", demarcates circuit system to avoid polluting;
3) when, being full of deionized water in boron water tank, start magnetic force ebullator to circulate, by flowmeter regulating loop flow in suitable setting value, open the electric heater in boron water tank, controlling heating makes " stopple coupon " interior water temperature reach the reference temperature of setting, protect as mark fixed temperature And and hold Heng temperature, read pulsimeter digit rate P/S value during stable state, as sample-out count value;
4), the boron concentration in boron adjustment water is added by boron water tank, boron water loop circulation is carried out under same traffic and temperature conditions, pulsimeter digit rate P/S value during record stable state, water sampling simultaneously, boron concentration in water is measured with chemical titration analysis, complete a calibration measurements, obtain the several right of one group of boron concentration and pulsimeter digit rate;
5), by same method, in boron water tank, progressively add the boron concentration that boron improves Loop Water, complete the measurement of several calibration points of gamut, obtain some numbers pair;
6), these are several right, be divided into some sections by boron concentration, segmentation input measurement device main frame (10) controller template, its CPU (central processing unit), by data processor, by every section at least two number pair, linearly mathematical model C
b=A+B(P/S)
-1carry out matching, obtain its calibration coefficient and store in a program, for measurement, namely complete and the online routine of boron densimeter is demarcated;
7), after calibration measurements terminates, switch the operation valve on " stopple coupon " two ends threeway branch road, recover " stopple coupon " and the connection of lower earial drainage water monitoring branch road, realize the on-line real time monitoring to reactor-loop water boron concentration.
As time goes on, due to the drift of electronic device, the decay of neutron detector sensitivity, weakening of neutron source strength, and water Zhong Fu Erosion product and fission product are in the impact of the factors such as " stopple coupon " tube wall deposition, boron measurement of concetration error increases gradually, to a fuel recycle later stage, does not even have Real-Time Monitoring effect.
When the measuring error of monitoring system is bigger than normal, adopt online instant standardization, step is:
1. current loop is run the chemical titration analysis boron concentration value of water sample, with sampling the moment pulsimeter digit rate value as a number pair;
2. the several right of at least one recent known boron concentration value and pulsimeter digit rate value is got;
3. by two groups of numbers to input measurement device console controller template, its CPU (central processing unit), by data processor, by two groups of numbers to by MODEL C
b=A+B(P/S)
-1carry out linear fit, namely obtain up-to-date calibration coefficient, available immediately, have modified and measure drift, realize the on-line real time monitoring to reactor-loop water boron concentration.
Claims (6)
1. boron concentration meter for nuclear power station, the system be made up of sniffer A, measurement mechanism B and caliberating device C, is characterized in that:
Described sniffer A:
1. on the lower earial drainage water monitoring branch road pipeline section of one loop of nuclear power station water after reducing temperature twice step-down, with Stainless Steel Shell (7) packaging closures one section of vertical pipeline section;
2. the vertical pipeline section of lower earial drainage water monitoring branch road in this Stainless Steel Shell (7) will be enclosed in as " stopple coupon " (2);
3. in this Stainless Steel Shell (7), corresponding neutron source (4) and neutron detector (3) are equipped with in the both sides of " stopple coupon " (2), the pipe shaft of neutron detector (3) is parallel with " stopple coupon " (2), and neutron detector (3) is connected on the prime amplifier (9) of measurement mechanism B main frame (10) by coaxial shielded cable;
4. the remaining space in Stainless Steel Shell (7) fills shielding medium polyethylene material (6), makes stainless steel case surface reach the radiation dose requirement of shelter of regulation;
5. the upper/lower terminal stretching out Stainless Steel Shell (7) in " stopple coupon " (2) is respectively equipped with a three-way connection (2-1,2-2), and another two branch roads of each three-way connection are respectively equipped with operation valve;
6. temperature sensor (1) is fixed on by clip on the outer tube wall of " stopple coupon " (2) upper port, temperature sensor (1) is connected with temperature transmitter (12) by three-wire system shielded cable, and the main frame (10) the TWS signal of collection being sent to measurement mechanism B processes;
Described measurement mechanism B:
Be made up of prime amplifier (9), temperature transmitter (12), main frame (10), printer and long-range show case (11);
Main frame (10) is instrument on the spot, and its back embeds low-tension supply template, high-voltage power supply template, mainly puts examination/chronoscope digital-to-analogue plate, controller template and temperature Bian collection/each plug-in unit of analog output template; There are display screen, warning and status indicator lamp and operation keyboard in its front end; Main frame (10) and printer are inserted on the spot in rack;
The low-tension supply template of main frame (10): constant voltage DC and alternating voltage are provided;
The high-voltage power supply template of main frame (10): the alternating voltage that its self-excited oscillator produces, exports high direct voltage to prime amplifier (9) after multiplying rectifier;
Prime amplifier (9): receive the high direct voltage exported from high-voltage power supply template, at this after filtering, carries this high direct voltage to neutron detector (3) for its work by coaxial shielded cable; Meanwhile, the pulse signal that neutron detector (3) sends is transported to prime amplifier (9) again and carries out one-level amplification by coaxial shielded cable;
The master of main frame (10) puts examination/chronoscope digital-to-analogue plate: its master puts examination module, amplify carrying out secondary from neutron detector (3) via the one-level amp pulse signal that prime amplifier (9) amplifies and be shaped, and compare with the threshold value that D/A modular converter is arranged and screened, cancelling noise signal; Its timing counting module, completes the statistics of step-by-step counting at the appointed time, through I/O interface, is transported to controller template by " BUS " bus;
Temperature sensor (1), measures the water temperature in " stopple coupon " (2);
Temperature transmitter (12), the TWS signal recorded by temperature sensor, is converted to temperature acquisition/analog output template that direct current DC4-20mA is delivered to main frame (10);
Temperature acquisition/analog output the template of main frame (10), the TWS signal collected is transported to controller template through " BUS " bus by its temperature collect module;
The controller template of main frame (10), controls collection signal, process data, display result, administrative alert and keyboard and control prints, and connects long-range show case (11) with network service;
Controller template, receive and main put the pulse counting signal and TWS signal that examinations/chronoscope digital-to-analogue plate and temperature acquisition/analog output template export, its CPU (central processing unit) passes through data processor, by the water sample boron concentration C of timing signal acquisition
bpulsimeter digit rate P/S corresponding with it, linearly mathematical model C
b=A+B(P/S)
-1according to water sample boron concentration C
bmatching is carried out in segmentation, and calibration coefficient A and B obtaining each section is stored; What store also has temperature correction coefficient simultaneously; During measurement, according to the pulsimeter digit rate value obtained and the calibration coefficient of being suitable for, boron concentration can be calculated; According to the deviation of reference temperature of actual measurement TWS and timing signal, utilize temperature correction coefficient in addition compensating approach, obtain final boron concentration measurement;
Temperature acquisition/analog output the template of main frame (10), boron concentration measurement is converted to analog current or analog voltage by its analog output module, exports analog quantity for nuclear power station relevant device;
On the display screen of main frame (10), observe directly the boron concentration measurement of numerical monitor, the in the recent period time dependent rolling curve of boron concentration measurement and surveying work parameter that some are main;
Operation keyboard carries out demarcation matching and confirms calibration coefficient, arranges or revise various alarm limits and parameter, and controls to print;
Described caliberating device C:
Be made up of boron water tank (14), electric heater (15), temperature-controlled cabinet (13), electric mixer, liquid level sensor, magnetic force ebullator (17), flow control valve (18), flowmeter (19) and each section of connecting hose;
Wherein: on boron water tank (14) upper cover, be provided with temperature-controlled cabinet (13), liquid return hole joint and agitator motor (22), bottom in boron water tank (14) settles electric heater (15) and suitable position settles electric mixer, liquid level sensor inserts appropriate depth, and liquid outlet joint and emptying/sample valve (16) are established in boron water tank (14) bottom; Boron water tank (14) liquid outlet joint connects the entrance of magnetic force ebullator (17) with flexible pipe, the liquid outlet of magnetic force ebullator (17) is by flexible pipe connection traffic variable valve (18), flow control valve (18) liquid outlet is by flexible pipe connection traffic meter (19), and the delivery outlet of flowmeter (19) is connected to by flexible pipe on a branch road of " stopple coupon " (2) lower end three-way connection in sniffer A; Liquid return hole joint above boron water tank (14) upper cover is connected on a branch road of " stopple coupon " (2) upper end three-way connection in sniffer A by flexible pipe; So, the demarcation loop of boron concentration is constituted by boron water tank (14), electric heater (15), temperature-controlled cabinet (13), electric mixer, liquid level sensor, magnetic force ebullator (17), flow control valve (18), flowmeter (19), " stopple coupon " (2) and each section of connecting hose;
" stopple coupon " (2) namely become the shared pipeline section demarcating lower earial drainage water monitoring branch road in loop and sniffer A, by "ON" or the "Off" of operation valve on the three-way connection branch road of two ends, " stopple coupon " (2), realize demarcating loop and be connected with the conversion of lower earial drainage water monitoring branch road;
Timing signal, closes valve three-way connection being connected lower earial drainage water monitoring branch road, opens the valve connecting caliberating device C, namely open and demarcate loop.
2. according to boron densimeter according to claim 1, it is characterized in that: neutron source (4) intensity in described sniffer A is 1 ~ 3 Curie, it is fixed in supporting component, this supporting component, from the reserved notch of Stainless Steel Shell one middle side part of sniffer A, inserts according to horizontal direction and makes neutron source (4) near " stopple coupon " (2).
3. according to boron densimeter according to claim 1, it is characterized in that: described caliberating device C, is arranged on and has on the dolly of two-layer structure;
Boron water tank (14) is equipped with on dolly upper strata, set temperature control box (13), liquid return hole joint and agitator motor on boron water tank (14) top board; Temperature-controlled cabinet (13) panel is arranged: power switch, electric heater switch, electric mixer switch, pilot lamp, display charactron and knob or button, in order to switch on power, opening electric heater (15), start electric mixer, setting and control boron water tank (14) constant temperature, display boron water tank (14) interior boron water temperature and to boron water tank (14) interior liquid level too low send to report to the police to indicate also automatically excise electric heater (15);
Magnetic force ebullator (17) is equipped with in dolly lower floor, the input port of this magnetic force ebullator connects the liquid outlet joint of boron water tank (14) bottom by flexible pipe, the delivery outlet of magnetic force ebullator (17) is by flexible pipe connection traffic variable valve (18), flow control valve (18) is again by flexible pipe connection traffic meter (19), the delivery outlet of this flowmeter (19) is connected on the branch road of lower end three-way connection (2-2) of " stopple coupon " (2) in sniffer A by flexible pipe (20), boron aqueous solution in boron water tank (14) like this is extracted out by magnetic force ebullator (17), by flexible pipe via flow control valve (18), flowmeter (19), behind " stopple coupon " (2) of sniffer A, boron water tank (14) is entered by the liquid return hole joint reflow at flexible pipe (21) and boron water tank (14) top, constitute the demarcation loop of boron water circulation,
Before demarcating, the dolly of caliberating device C is moved to reactor-loop lower earial drainage water monitoring after reducing temperature twice step-down and prop up roadside, flexible pipe (21 in loop will be demarcated respectively, 20) joint, be connected on the branch road of sniffer A " stopple coupon " (2) upper/lower terminal head three-way connection (2-1,2-2);
Timing signal, close the valve " stopple coupon " (2) upper/lower terminal head three-way connection being connected lower earial drainage water monitoring branch road, " stopple coupon " (2) and lower earial drainage water monitoring branch road are blocked, open valve two ends three-way connection branch road being connected caliberating device C, " stopple coupon " (2) and caliberating device C are formed and demarcates loop.
4. according to boron densimeter according to claim 1, it is characterized in that: the electric heater (15) contacted with water in the boron water tank (14) of caliberating device C, electric mixer surface are stainless steel surfaces, establish stainless steel liquid level rule at boron tank inner wall.
5. use the described boron densimeter of one of claim 1 ~ 4, the method that boron concentration routine demarcates carried out to primary Ioops water, press down and state step Sudden and carry out:
1), demarcation loop is connected in " stopple coupon " (2) in sniffer A;
2), with deionized water string wash " stopple coupon " (2), when boron concentration is considered as zero in water, stop string washing;
3), when being full of deionized water in boron water tank, starting magnetic force ebullator (17) and circulate, pass through
Flow control valve (18) regulating loop flow is in suitable setting value, open the electric heater (15) in boron water tank (14), controlling heating makes the interior water temperature in " stopple coupon " (2) reach the reference temperature of setting, with reference to temperature as demarcating temperature and keeping constant temperature, read pulsimeter digit rate P/S value during stable state, as sample-out count value;
4), the boron concentration in boron adjustment water is added by boron water tank (14), circulate under same traffic and temperature conditions, pulsimeter digit rate P/S value during record stable state, water sampling simultaneously, boron concentration in water is measured with chemical titration analysis, complete a calibration measurements, obtain the several right of one group of boron concentration and pulsimeter digit rate;
5), by same method, in boron water tank, progressively add the boron concentration that boron improves Loop Water, complete the measurement of several calibration points of gamut, obtain some numbers pair;
6), by these be severally divided into some sections to by boron concentration, the CPU (central processing unit) of segmentation input measurement device B main frame (10) controller template, by its data processor, by every section at least two number pair, linearly mathematical model C
b=A+B(P/S)
-1carry out matching, obtain its calibration coefficient and store in a program for measurement, complete and the online routine of boron densimeter is demarcated;
7), after calibration measurements terminates, switch the operation valve on the three-way connection branch road of two ends, " stopple coupon " (2), recover " stopple coupon " (2) and the connection of lower earial drainage water monitoring branch road, realize the on-line real time monitoring to reactor-loop water boron concentration.
6. use one of claim 1 ~ 4 described boron densimeter, primary Ioops water is carried out to the online instant scaling method of boron concentration, step is as follows:
1. current loop is run the chemical titration analysis boron concentration value of water sample, with sampling the moment pulsimeter digit rate value as a number pair;
2. the several right of at least one recent known boron concentration value and pulsimeter digit rate value is got;
3. by the data processor of two groups of numbers to the controller template of input measurement device B main frame, by MODEL C
b=A+B(P/S)
-1carry out linear fit, namely obtain up-to-date calibration coefficient, immediately for, have modified measure drift, realize the on-line real time monitoring to reactor-loop water boron concentration.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104464853B (en) * | 2014-11-27 | 2017-02-22 | 武汉海王核能装备工程有限公司 | On-line boron concentration monitoring device |
| CN104485141B (en) * | 2014-12-11 | 2017-01-18 | 中国核动力研究设计院 | Calibration device for measurement parameters of nuclear power station boron concentration measurement system |
| CN106571169B (en) * | 2016-10-28 | 2018-09-07 | 广西防城港核电有限公司 | Nuclear power station boron density monitoring system automatic calibration method |
| CN107610790A (en) * | 2017-08-17 | 2018-01-19 | 广西防城港核电有限公司 | A kind of neutron count rate harvester and method for the demarcation of nuclear power station boron table |
| CN109473185B (en) * | 2018-11-13 | 2022-07-29 | 中国核动力研究设计院 | Testing device and testing method for automatic chemical reactor shutdown system |
| CN113284637A (en) * | 2020-02-20 | 2021-08-20 | 阳江核电有限公司 | Automatic calibration device for online boron meter of nuclear power plant |
| CN113409895B (en) * | 2021-06-23 | 2023-04-11 | 中国核动力研究设计院 | Man-machine interaction method and device for boron meter chemical titration |
| CN113340978B (en) * | 2021-06-23 | 2022-03-18 | 中国核动力研究设计院 | Method and system for measuring concentration of elements of unnatural isotope abundance |
| CN113418942B (en) * | 2021-06-23 | 2024-02-06 | 中国核动力研究设计院 | Automatic calibration method and device for boron concentration measurement system |
| CN114400104A (en) * | 2022-01-04 | 2022-04-26 | 中广核工程有限公司 | Method and system for improving measurement accuracy of boron meter |
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