CN114354078B - Nuclear power station important habitability area tightness test and evaluation method - Google Patents
Nuclear power station important habitability area tightness test and evaluation method Download PDFInfo
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- CN114354078B CN114354078B CN202111411470.3A CN202111411470A CN114354078B CN 114354078 B CN114354078 B CN 114354078B CN 202111411470 A CN202111411470 A CN 202111411470A CN 114354078 B CN114354078 B CN 114354078B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/06—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool
- G01M3/08—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing bubbles in a liquid pool for pipes, cables or tubes; for pipe joints or seals; for valves; for welds
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/12—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water
- G01M3/14—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by observing elastic covers or coatings, e.g. soapy water for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
- G01M3/22—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material for pipes, cables or tubes; for pipe joints or seals; for valves; for welds; for containers, e.g. radiators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
- G01M3/24—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using infrasonic, sonic, or ultrasonic vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N30/00—Investigating or analysing materials by separation into components using adsorption, absorption or similar phenomena or using ion-exchange, e.g. chromatography or field flow fractionation
- G01N30/02—Column chromatography
Abstract
The invention belongs to the technical field of nuclear facility important habitability test and evaluation, and particularly relates to a nuclear power station important habitability test and evaluation method, which comprises the following steps: step S1, testing the boundary tightness of an important habitable area; s2, testing and evaluating the regional tightness of the important habitable area; the step S2 comprises the following steps: step S2.1, arranging sampling points of trace gas in important habitable areas; step S2.2, measuring the free volume and evaluation of the important habitat by using a tracer gas method; s2.3, performing area tightness test and evaluation of important habitable areas by adopting a concentration attenuation method; and S2.4, performing area tightness test and evaluation of the important habitable area by adopting a constant flow injection method. The invention covers a complete set of technical systems such as equipment research and development, measuring point arrangement, method application and the like required by important residence area boundary tightness test and area tightness test and evaluation, and can be directly applied to engineering.
Description
Technical Field
The invention belongs to the technical field of nuclear facility important habitability test and evaluation, and particularly relates to a nuclear power station important habitability test and evaluation method.
Background
An important habitable area of a nuclear facility refers to an area in the nuclear facility (such as a nuclear power plant) where necessary habitable atmosphere (temperature, humidity, cleanliness, and the like of air meet the residence requirements of personnel) needs to be provided for the attended personnel in an abnormal state (nuclear leakage, biochemical attack, and the like). Under abnormal conditions, the operator can delay or stop the development of the abnormal conditions of the nuclear facilities when being on duty in the important habitat area, and the consequences brought by the abnormal conditions are lightened or eliminated, so that the important habitat area has important significance. The tightness of the important habitability area is an important guarantee that the important habitability area provides necessary habitability atmosphere environment for the attendees in an abnormal state, and no method for testing the tightness of the important habitability area exists at present.
Disclosure of Invention
The invention aims to provide a method for testing the tightness of an important habitable area, and provides relevant basis for testing the tightness of the important habitable area.
In order to achieve the above purpose, the technical scheme adopted by the invention is a method for testing and evaluating the tightness of important habitability areas of a nuclear power station, which is used for testing the tightness of the important habitability areas of the nuclear power station, and comprises the following steps:
Step S1, testing the boundary tightness of an important habitable area;
s2, testing and evaluating the regional tightness of the important habitable area;
the step S2 includes:
step S2.1, arranging sampling points of trace gas in the important habitat area;
step S2.2, measuring the free volume and evaluation of the important habitat by using a tracer gas method;
s2.3, performing area tightness test and evaluation of the important habitable area by adopting a concentration attenuation method;
and S2.4, performing area tightness test and evaluation of the important habitable area by adopting a constant flow injection method.
Further, in the step 1, the boundary tightness test of the important habitable area includes the following steps:
s1.1, determining key positions in the boundary of an important habitable area, wherein the key positions need to be subjected to a sealing test; the key positions comprise holes, doors and ventilation pipe networks on the boundary of the important habitable area; the ventilation pipe network comprises a positive pressure pipe section, a negative pressure pipe section, a positive pressure pipe network and a negative pressure pipe network;
s1.2, the sealing test of the hole adopts an ultrasonic method, and the detection equipment is an ultrasonic leak detector; the acceptance criterion is to compare with a reference value, and the reference value should not be exceeded by 5 units;
S1.3, the sealing test of the door adopts an ultrasonic method, and the detection equipment is an ultrasonic leak detector; the acceptance criterion is to compare with a reference value, and the reference value should not be exceeded by 5 units;
s1.4, sealing test of the positive pressure pipe section adopts a soap foam method, and a detection agent is leakage detection liquid; the acceptance criterion is no visible leakage point;
s1.5, sealing test of the negative pressure pipe section adopts a water mist method, and the detection equipment is a water vapor generator; the acceptance criterion is that no visible leakage point exists, and after the negative pressure pipe section is tested to be qualified, a tracer gas method is used for integrally testing the positive pressure pipe network;
s1.6, detecting the air pipe leakage rate of the positive pressure pipe network by adopting a tracer gas method in the sealing test of the positive pressure pipe network, wherein the detection equipment is a gas chromatograph; the acceptance criterion of the air pipe leakage rate is less than or equal to 1 per mill, specifically means that when the ratio of the concentration of the trace gas in the region or the room contained in the important habitability area to the concentration of the trace gas in the positive pressure pipe network is less than or equal to 1 per mill after the trace gas is injected into the positive pressure pipe network, the tightness of the positive pressure pipe network is qualified, otherwise, the tightness of the positive pressure pipe network is not qualified;
s1.7, detecting the air pipe leakage rate of the negative pressure pipe network by adopting a tracer gas method in the sealing test of the negative pressure pipe network, wherein the detection equipment is a gas chromatograph; the acceptance criterion of the air pipe leakage rate is less than or equal to 1 per mill, specifically means that when the ratio of the concentration of the trace gas in the air pipe of the negative pressure pipe network to the concentration of the trace gas in the area or the room contained in the important habitable area is less than or equal to 1 per mill after the trace gas is injected into the area or the room contained in the important habitable area, the tightness of the negative pressure pipe network is qualified, and otherwise, the tightness of the negative pressure pipe network is not qualified.
Further, said step S2.1 of arranging sampling points of the trace gas at said important habitability area comprises the steps of:
a step S2.1.1 of defining the composition of the building rooms of the important habitable area;
a step S2.1.2, defining an airflow organization form of each room of the important habitability area, wherein the airflow organization form refers to an inflow position and an outflow position of airflow in the room;
a step S2.1.3 of defining an area of a cross-section of flowing air perpendicular to the direction of air flow in each room of the important habitability area;
step S2.1.4, calculating the number of the sampling points of each room, and determining the positions of the sampling points;
in step S2.1.5, an arrangement scheme of trace gas sampling points in important habitable areas is formulated, and the principle is that key rooms are controlled independently and general rooms are controlled overall.
Further, in said step S2.2, the free volume of said important habitat is measured using a tracer gas method comprising the steps of:
step S2.2.1, injecting a quantitative amount of the tracer gas into the important habitat, wherein the injection amount of the tracer gas is denoted as Q, and the unit is: ml;
step S2.2.2, uniformly mixing the trace gas in the important habitability area by adjusting the operation state of a ventilation system of the important habitability area;
Step S2.2.3, sampling through the sampling points of the important habitable areas to obtain the equilibrium concentration of the trace gas; the equilibrium concentration is noted as C, units: ppm;
step S2.2.4, obtaining the free volume of the important habitat area according to the ratio of the injection amount of the trace gas to the equilibrium concentration, wherein the formula is V=Q/C; the free volume is noted as V, units: m is m 3 。
Further, in the step S2.2, the method further comprises the step of evaluating the result of the free volume of the important habitability area, including the steps of:
step S2.2.5 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.2.6, determining the tracer gas injection flow q; units: ml/h;
step S2.2.7, calculating uncertainty u (q) =0.29 δ of the tracer gas injection flow rate q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.2.8, determining the resolution δ of the timer 2 The timer is used for determining the tracer gas injection time t; the injection time of the tracer gas is automatically timed by an injection device with a calculation program, and the unit is as follows: s;
step S2.2.9, determining tracer gas injection time t; units: s;
step S2.2.10, calculating uncertainty u (t) =0 of the trace gas injection time; units: s;
Step S2.2.11, calculating the trace gas injection quantity q=q×t/3600; units: ml;
step S2.2.12, calculating uncertainty u (Q) =tu (Q)/3600 of the trace gas injection amount Q; units: ml;
step S2.2.13 calculating the equilibrium concentration of the tracer gasUnit (B)：ppm；C vi The trace gas concentration of the sampling points in the important habitat area is indicated, the number of the sampling points is 40, i is more than or equal to 1 and less than or equal to 40;
step S2.2.14, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.2.15 calculating uncertainty u (C) v )＝0.046*δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.2.16 calculating uncertainty of free volume of the significant habitatUnits: m is m 3 ；
Step S2.2.17 calculating uncertainty of n measurements of free volume of the significant habitable area
Step S2.2.18, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.2.19, calculating the free volume n-time measurement integrated uncertainty of the significant habitability area: u (Ve) =t95% > U (Ve); units: m is m 3 ；
Step S2.2.20, concluding: the free volume test result Ve of the important habitat area, confidence interval [ -U (Ve), U (Ve) ]The confidence probability is 95%; units: m is m 3 。
Further, in the step S2.3, the area tightness test of the important habitability area is performed by using a concentration decay method, including the steps of:
step S2.3.1, measuring the air supply quantity of the important habitability area and marking as Q1;
a step S2.3.2 of introducing a quantitative tracer gas into the important habitat;
step S2.3.3, after equilibration of the trace gas within the critical habitat, a first sampling is conducted through the sampling point of the critical habitat,obtaining a first equilibrium concentration of said tracer gas in said significant habitability area, designated C 1 Units: ppm;
step S2.3.4, after waiting T hours, performing a second sampling through said sampling points of said critical habitat to obtain a second equilibrium concentration of said tracer gas within said critical habitat, denoted C 2 Units: ppm;
step S2.3.5, calculating the ventilation a of the important habitable area in units of: "times/h", a= (lnC) 1 -lnC 2 )/T；
Step S2.3.6, calculating the internal leakage Q2 of the important habitable area in units of: m is m 3 /h，Q2＝A*V-Q1。
Further, in the step S2.3, the method further includes evaluating the result of the region sealability test of the important habitability area by a concentration decay method, including the steps of:
Step S2.3.7 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.3.8, determining the tracer gas injection flow q; units: ml/h;
step S2.3.9, calculating uncertainty u (q) =0.29 δ of the tracer gas injection flow rate q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.3.10, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.11, calculating the trace gas concentration C of the air volume measuring point n ＝(C n1 +C n2 +C n3 ) 3; units: ppm; the air volume measuring point is a sampling point arranged on a downstream air pipe of a fan of the ventilation system of the important habitability area, and the C n1 The C is n2 And said C n3 Three tracer gas concentrations are obtained on the same air volume measuring point through three independent sampling pipelines;
step S2.3.12, calculating uncertainty u (C) of the trace gas concentration at the air volume measurement point n )＝0.167δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.13, calculating the fresh air quantity qn=q/C n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.14, calculating the uncertainty of the fresh air quantity,units: m is m 3 /h；
Step S2.3.15, determining an interval time T between the first sampling and the second sampling of the sampling points of the important habitable region; units: h, performing H;
Step S2.3.16, calculating uncertainty u (T) =0 of the T;
step S2.3.17 the first tracer gas concentration at the sampling point of the significant habitability area is noted as C 1i The second trace gas concentration at the sampling point of the significant habitability area is noted as C 2i I is more than or equal to 1 and less than or equal to 40; units: ppm;
step S2.3.18 calculating uncertainty u (C) of the trace gas concentration at the sampling point of the significant habitability area 1i )＝u(C 2i )＝0.29δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
in step S2.3.19 the process steps are performed,
calculating the tracer gas equilibrium concentration at said sampling point of said significant habitable area in a first samplingUnits: ppm;
C j1i the trace gas concentration at the ith sampling point is sampled for the jth test 1 st time; units: ppm;
calculating the tracer gas equilibrium concentration at said sampling point of said significant habitable area in a second sub-sampleUnits: ppm;
C j2i the trace gas concentration of the ith sampling point is sampled for the jth test 2 nd time; units: ppm; the number of the sampling points is 40, i is more than or equal to 1 and less than or equal to 40;
step S2.3.20, calculating uncertainty u (C) 1p )＝u(C 2p )＝0.046*δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.21 calculating the jth test mean ventilation A of said important habitable area j ＝(lnC 1p -lnC 2p ) T; units: secondary/h;
step S2.3.22 calculating uncertainty in mean ventilation for the jth trial of the significant habitatUnits: secondary/h;
step S2.3.23, calculating the j-th test inner leakage Q of the important habitability area j，leak ＝A j *V-Q n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.24 calculating uncertainty in leak in the jth test of the important habitat areaUnits: m is m 3 /h；
Step S2.3.25 calculating uncertainty of n measurements of internal leakage of said significant habitatUnits: m is m 3 /h；
Step S2.3.26, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.3.27, calculating the integrated uncertainty of n measurements of the internal leakage of the important habitable area: u (Q) e,leak )＝t 95％ *u(Q e,leak ) The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.28, concluding: internal leakage test results Q of the important habitat e,leak Confidence interval [ -U (Q) e,leak ),U(Q e,leak )]The confidence probability is 95%; units: m is m 3 /h。
Further, in the step S2.4, the area tightness test and evaluation of the important habitability area are performed by adopting a constant flow injection method, and the method comprises the following steps:
step S2.4.1, measuring the air supply quantity of the important habitability area, and recording as Q3, unit: m is m 3 /h；
Step S2.4.2, introducing quantitative tracer gas into the important habitat, wherein the injection flow rate of the tracer gas is denoted as q, and the unit is: ml/h;
Step S2.4.3, when the injection time of the trace gas reaches the theoretical time of the final equilibrium concentration, performing a first sampling by the sampling point of the important habitability area to obtain a first equilibrium concentration of the trace gas in the important habitability area, denoted as C 3 Units: ppm;
step S2.4.4, at 15min intervals, performing a second sampling by said sampling points of said important habitat to obtain a second equilibrium concentration of said tracer gas in said important habitat, denoted C 4 Units: ppm;
step S2.4.5, if inequality (C 4 -C 3 ) T < 0.05 q/V is true, C 4 Namely the final equilibrium concentration C 5 The method comprises the steps of carrying out a first treatment on the surface of the If the inequality is not satisfied, sampling is needed to be continued until the inequality is satisfied; the T is the time interval between the first sampling and the second sampling;
step S2.4.6, calculating the internal leakage Q4 of the important habitable area in units of: m is m 3 /h，Q4＝q/C 5 -Q3。
Further, in the step S2.4, the method further includes evaluating the result of the area tightness test of the important habitability area by using a constant flow injection method, including the steps of:
step S2.4.7 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
Step S2.4.8, determining the tracer gas injection flow q; units: ml/h;
step S2.4.9, calculating uncertainty u (q) =0.29 δ of the tracer gas injection flow rate q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.4.10, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.11, calculating the trace gas concentration C of the air volume measuring point n ＝(C n1 +C n2 +C n3 ) 3; units: ppm; the air volume measuring point is a sampling point arranged on a downstream air pipe of a fan of the ventilation system of the important habitability area, and the C n1 The C is n2 And said C n3 Three tracer gas concentrations are obtained on the same air volume measuring point through three independent sampling pipelines;
step S2.4.12, calculating uncertainty u (C) of the trace gas concentration at the air volume measurement point n )＝0.167δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.13, calculating the fresh air quantity qn=q/C n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.4.14, calculating the uncertainty of the fresh air quantity,units: m is m 3 /h；
Step S2.4.15 the first tracer gas concentration at the sampling point of the jth test of the critical habitat is designated C j1i The second trace gas concentration at the sampling point of the jth test of the critical habitat is designated C j2i I is more than or equal to 1 and less than or equal to 40; units: ppm; executing n times of tests in total, wherein j is more than or equal to 1 and less than or equal to n;
step S2.4.16 calculating uncertainty u (C) of the trace gas concentration at the sampling point of the significant habitability area j1i )＝u(C j2i )＝0.29δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.17 calculating an equilibrium concentration of a second tracer gas concentration for said sampling point of a jth test of said critical habitatUnits: ppm;
step S2.4.18, calculating the internal leakage of the jth test of the important habitability area
Q j，leak ＝q j，in /C j4p -Q n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h; the q is j，in The j-th test is used for injecting the trace gas injection quantity set on the gas flowmeter of the trace gas;
step S2.4.19, calculating uncertainty of the inner leakage of the important habitable areaUnits: m is m 3 /h；
Step S2.4.20, calculating the internal leakage of the important habitable regionUnits: m is m 3 /h；
Step S2.4.21 calculating uncertainty of n measurements of internal leakage of said significant habitatUnits: m is m 3 /h；
Step S2.4.22, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.4.23, calculating the integrated uncertainty of n measurements of the internal leakage of the important habitable area: u (Q) e,leak )＝t 95％ *u(Q e,leak ) The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.4.24, concluding: internal leakage test results Q of the important habitat e,leak Confidence interval [ -U (Q) e,leak ),U(Q e,leak )]The confidence probability is 95%; units: m is m 3 /h。
The invention has the beneficial effects that:
1. the method is simple and convenient, and the practical state of the important resident area boundary engineering is very complex and huge in quantity, so that the primary condition of the method for testing the boundary engineering is simple and convenient (the complex testing method is high in engineering cost, long in working time, occupies the key construction period of engineering construction and is not suitable for large-scale engineering application).
2. The method is visual, the test result is preferably displayed in real time, and timely evaluation or treatment is facilitated.
3. The test result can be quantified, so that the change condition of boundary tightness of an important habitable area can be tracked for a long time, the trend is researched and judged, and reasonably necessary preventive maintenance measures are adopted.
4. The maintenance cost is reduced, and in general, the sealing performance of the important habitability area is guaranteed as long as the sealing performance of the boundary of the important habitability area is guaranteed, and on the premise, the frequency of testing and evaluating the sealing performance of the important habitability area can be properly and reasonably reduced, so that the reasonable total cost is maintained.
5. The invention covers a complete set of technical systems such as equipment research and development, measuring point arrangement, method application and the like required by important residence area boundary tightness test and area tightness test and evaluation, and can be directly applied to engineering.
Drawings
FIG. 1 is a flow chart of a method for testing and evaluating the tightness of important habitability areas of a nuclear power plant according to an embodiment of the invention.
Detailed Description
The invention is further described below with reference to the drawings and examples.
As shown in fig. 1, the method for testing and evaluating the tightness of the important habitability area of the nuclear power station provided by the invention is used for testing the tightness of the important habitability area of the nuclear power station, and comprises the following steps:
step S1, testing the boundary tightness of an important habitable area;
step S2, testing and evaluating the regional tightness of the important habitable area (after the border tightness test of the important habitable area is qualified, testing and evaluating the regional tightness of the important habitable area);
the step S2 comprises the following steps:
step S2.1, arranging sampling points of trace gas in important habitable areas;
step S2.2, measuring the free volume and evaluation of the important habitat by using a tracer gas method;
s2.3, performing area tightness test and evaluation of important habitable areas by adopting a concentration attenuation method;
and S2.4, performing area tightness test and evaluation of the important habitable area by adopting a constant flow injection method.
In step 1, the boundary tightness test of the important habitable area comprises the following steps:
S1.1, determining key positions in the boundary of an important habitable area, wherein the key positions need to be subjected to a sealing test; key locations include holes, gates and ventilation network on the boundaries of important habitable areas; the ventilation pipe network comprises a positive pressure pipe section, a negative pressure pipe section, a positive pressure pipe network and a negative pressure pipe network;
s1.2, sealing and testing holes by adopting an ultrasonic method, wherein the detection equipment is an ultrasonic leak detector; the acceptance criterion is to compare with a reference value, and the reference value should not be exceeded by 5 units; the ultrasonic method has the advantages of simplicity, intuitiveness and quantification;
s1.3, performing door sealing test by adopting an ultrasonic method, wherein the detection equipment is an ultrasonic leak detector; the acceptance criterion is to compare with a reference value, and the reference value should not be exceeded by 5 units; the ultrasonic method has the advantages of simplicity, intuitiveness and quantification;
s1.4, sealing test of the positive pressure pipe section adopts a soap foam method, and the detection agent is leakage detection liquid; the acceptance criterion is no visible leakage point; the soap bubble method has the advantages of simplicity, convenience and intuitiveness;
s1.5, sealing test of the negative pressure pipe section adopts a water mist method, and the detection equipment is a (high generation amount) water vapor generator; the acceptance criterion is that no visible leakage point exists, and after the negative pressure pipe section is tested to be qualified, a tracer gas method is used for integrally testing the positive pressure pipe network; the water mist method has the advantages of simplicity, convenience and intuitiveness;
Step S1.6, detecting the air pipe leakage rate of the positive pressure pipe network by adopting a tracer gas method in the sealing test of the positive pressure pipe network (after the positive pressure pipe section is qualified in test and the negative pressure pipe section is qualified in test, the whole positive pressure pipe network is tested by adopting the tracer gas method), and the detection equipment is a gas chromatograph; the acceptance criterion of the air pipe leakage rate is less than or equal to 1 per mill (can be determined by the actual condition of the positive pressure pipe network specifically), specifically means that when the ratio of the concentration of the trace gas in the region or the room contained in the important habitable area to the concentration of the trace gas in the positive pressure pipe network is less than or equal to 1 per mill after the trace gas is injected into the positive pressure pipe network, the tightness of the positive pressure pipe network is qualified, otherwise, the tightness of the positive pressure pipe network is unqualified; the tracer gas method has the advantages of simplicity, intuitiveness and quantification;
step S1.7, detecting the air pipe leakage rate of the negative pressure pipe network by adopting a tracer gas method in the sealing test of the negative pressure pipe network (after the positive pressure pipe section is qualified in test and the negative pressure pipe section is qualified in test, the whole positive pressure pipe network is tested by adopting the tracer gas method), and the detection equipment is a gas chromatograph; the acceptance criterion of the air pipe leakage rate is less than or equal to 1 per mill (can be determined by the actual condition of the negative pressure pipe network specifically), specifically means that when the ratio of the concentration of the trace gas in the air pipe of the negative pressure pipe network to the concentration of the trace gas in the region or room contained in the important habitable area is less than or equal to 1 per mill after the trace gas is injected into the region or room contained in the important habitable area, the tightness of the negative pressure pipe network is qualified, otherwise, the tightness of the negative pressure pipe network is not qualified; the tracer gas method has the advantages of simplicity, intuitiveness and quantification;
In addition, in the boundary tightness test of the important habitat, the related equipment positioned on the boundary of the important habitat is detected along with a ventilation pipe network; other devices positioned on the boundary of the important habitable area determine the corresponding detection method according to the structural characteristics of the boundary of the important habitable area and the actual conditions on site, and the device has the characteristics of simplicity, intuitiveness and quantification.
At step S2.1, a sampling point for the trace gas is arranged at the important habitat area, comprising the steps of:
step S2.1.1, defining the composition of building rooms in which a habitable area is important;
step S2.1.2, defining an airflow organization form of each room of the important habitable area, wherein the airflow organization form refers to an inflow position and an outflow position of an airflow in the room;
step S2.1.3, determining the area of the cross section of flowing air perpendicular to the direction of air flow in each room of the important habitability area;
step S2.1.4, calculating the number of sampling points of each room (area), and determining the positions of the sampling points;
in step S2.1.5, an arrangement scheme of trace gas sampling points in important habitable areas is formulated, the principle is that key rooms are controlled independently, general room overall control (i.e. a plurality of rooms are combined into a region to set sampling points) is achieved, sampling representativeness is guaranteed, and engineering applicability is considered.
In step S2.2, the free volume of the important habitat is measured using a tracer gas method comprising the steps of:
step S2.2.1, injecting a quantitative tracer gas into the important habitat, wherein the injection quantity of the tracer gas is denoted as Q and is expressed in units: ml;
step S2.2.2, enabling the trace gas in the important habitat to be quickly and uniformly mixed by adjusting the running state of the ventilation system of the important habitat;
step S2.2.3, sampling through sampling points of important habitable areas to obtain the equilibrium concentration of the trace gas; the equilibrium concentration is noted as C, units: ppm;
step S2.2.4, obtaining the free volume of the important habitat area by the ratio of the injection amount of the trace gas to the equilibrium concentration, wherein the formula is V=Q/C; free volume is noted as V, unit: m is m 3 。
The test gist in step S2.2:
1) The injection amount of the trace gas needs to be precisely measured;
2) The state of the ventilation system of the important habitable area needs to be adjusted, the air quantity is large, the positive pressure is low, the uniform mixing of trace gases is facilitated, and meanwhile, the trace gases do not leak out of the important habitable area;
3) The concentration distribution of the trace gas should be uniform when the trace gas is sampled;
4) The sampling time of the equilibrium concentration of the trace gas is the single ventilation time of the important habitable area.
In step S2.2, the method further comprises the step of evaluating the results of the free volume of the important habitability area, comprising the steps of:
step S2.2.5 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.2.6, determining the tracer gas injection flow q; units: ml/h;
step S2.2.7, calculating uncertainty u (q) =0.29 δ of tracer gas injection flow q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.2.8, determining the resolution δ of the timer 2 The timer is used for determining the tracer gas injection time t; the injection time of the tracer gas is automatically timed by an injection device with a calculation program, and the unit is as follows: s;
step S2.2.9, determining tracer gas injection time t; units: s;
step S2.2.10, calculating uncertainty u (t) =0 of the trace gas injection time; units: s;
step S2.2.11, calculating the trace gas injection quantity q=q×t/3600; units: ml;
step S2.2.12, calculating uncertainty u (Q) =tu (Q)/3600 of the trace gas injection amount Q; units: ml;
step S2.2.13 calculating the equilibrium concentration of the tracer gasUnits: ppm; c (C) vi The trace gas concentration of sampling points in an important habitable area is shown, wherein the number of the sampling points is 40, i is more than or equal to 1 and less than or equal to 40;
Step S2.2.14, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.2.15, calculating uncertainty u (C) v )＝0.046*δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.2.16 calculating uncertainty of free volume of the significant habitable areaUnits: m is m 3 ；
Step S2.2.17 calculating uncertainty of n measurements of free volume of the critical habitat
Step S2.2.18, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.2.19, calculating the free volume of the significant habitable area n measurements of integrated uncertainty: u (Ve) =t95% > U (Ve); units: m is m 3 ；
Step S2.2.20, concluding: free volume test results of significant habitat Ve, confidence interval [ -U (Ve), U (Ve)]The confidence probability is 95%; units: m is m 3 。
In step S2.3, the area tightness test and evaluation of the important habitable area are performed by using a concentration decay method, including the steps of:
step S2.3.1, measuring the air supply quantity of the important habitable area, and recording as Q1;
step S2.3.2, introducing quantitative tracer gas into the important habitat area;
step S2.3.3 after the balance of the tracer gas in the significant habitability area, performing a first sampling via the sampling points of the significant habitability area to obtain a first balance concentration of the tracer gas in the significant habitability area, denoted C 1 Units: ppm;
step S2.3.4, after waiting T hours, performing a second sampling by the sampling point of the important habitat to obtain a second equilibrium concentration of the tracer gas in the important habitat, denoted C 2 Units: ppm;
step S2.3.5, calculate ventilation a of the important habitat area in units of: "times/h", a= (lnC) 1 -lnC 2 )/T；
Step S2.3.6, calculating the internal leakage Q2 of the important habitable area in units of: m is m 3 /h，Q2＝A*V-Q1。
The test gist in step S2.3 is:
1) When the test starts, the concentration of the trace gas is distributed uniformly in the important residence area;
2) At the end of the test, the concentration distribution of the trace gas is still uniform in the important habitat area;
3) The test time T is the single ventilation time of the important habitable area;
4) The free volume of the important habitat is involved in the calculation.
In step S2.3, the method further includes evaluating the result of the region tightness test of the important habitability area by using the concentration decay method, including the steps of:
step S2.3.7 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.3.8, determining the tracer gas injection flow q; units: ml/h;
step S2.3.9, calculating uncertainty u (q) =0.29 δ of tracer gas injection flow q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.3.10, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.11, calculating the trace gas concentration C of the air volume measuring point n ＝(C n1 +C n2 +C n3 ) 3; units: ppm; the air volume measuring point is a sampling point arranged on a downstream air pipe of a fan of the ventilation system of the important habitable area, C n1 、C n2 And C n3 Three tracer gas concentrations are obtained on the same air volume measuring point through three independent sampling pipelines;
step S2.3.12, uncertainty u (C) of the trace gas concentration at the air volume measurement point is calculated n )＝0.167δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.13, calculating the fresh air quantity qn=q/C n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.14, calculating uncertainty of the fresh air quantity,units: m is m 3 /h；
Step S2.3.15, determining the interval time T between the first sampling and the second sampling of the sampling points of the important habitable area; units: h, performing H;
step S2.3.16, calculating uncertainty u (T) =0 of T;
step S2.3.17 the first trace gas concentration at the sampling point of the significant habitable area is noted as C 1i The second trace gas concentration at the sampling point of the important habitable zone is noted as C 2i I is more than or equal to 1 and less than or equal to 40; units: ppm;
step S2.3.18 calculating uncertainty of trace gas concentration u (C) 1i )＝u(C 2i )＝0.29δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
in step S2.3.19 the process steps are performed,
calculating the tracer gas equilibrium concentration at the sampling point of the important habitable zone in the first samplingUnits: ppm;
C j1i the trace gas concentration of the ith sampling point of the 1 st sampling of the jth test (n tests are carried out in total); units: ppm;
calculating the tracer gas equilibrium concentration at the sampling point of the important habitable zone in the second samplingUnits: ppm;
C j2i the trace gas concentration at the ith sampling point is sampled for the jth test 2 nd time; units: ppm; the number of sampling points is 40, i is more than or equal to 1 and less than or equal to 40;
step S2.3.20, calculating uncertainty u (C) 1p )＝u(C 2p )＝0.046*δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.21, calculating the average ventilation A of the jth trial of the significant habitable area j ＝(lnC 1p -lnC 2p ) T; units: secondary/h;
step S2.3.22 calculating uncertainty in mean ventilation for the jth trial of significant habitatUnits: secondary/h;
step S2.3.23, calculate importanceLeakage Q in jth test of habitable area j，leak ＝A j *V-Q n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.24 calculating uncertainty of leak in jth test of important habitatUnits: m is m 3 /h；
Step S2.3.25 calculating uncertainty of n measurements of internal leakage of the significant habitatUnits: m is m 3 /h；
Step S2.3.26, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.3.27, calculating the integrated uncertainty of n measurements of the internal leakage of the important habitable area: u (Q) e,leak )＝t 95％ *u(Q e,leak ) The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.28, concluding: internal leakage test results Q of important habitat e,leak Confidence interval [ -U (Q) e,leak ),U(Q e,leak )]The confidence probability is 95%; units: m is m 3 /h。
In step S2.4, a constant flow injection method is used to perform an area tightness test of the important habitable area, which includes the following steps:
step S2.4.1, measuring the air supply quantity of the important habitable area, and recording as Q3, unit: m is m 3 /h；
Step S2.4.2, introducing quantitative tracer gas into the important habitat, wherein the tracer gas injection flow is denoted as q, and the unit is: ml/h;
step S2.4.3 when the injection time of the tracer gas reaches the theoretical time of the final equilibrium concentration, the first equilibrium concentration of the tracer gas in the important habitable zone is obtained by first sampling at the sampling point of the important habitable zone, denoted as C 3 Units: ppm;
step S2.4.4, interval 15min, passing through important habitable areasSampling the sample point for the second time to obtain a second equilibrium concentration of the trace gas in the important habitable area, which is marked as C 4 Units: ppm;
Step S2.4.5, if inequality (C 4 -C 3 ) T < 0.05 q/V is true, C 4 Namely the final equilibrium concentration C 5 The method comprises the steps of carrying out a first treatment on the surface of the If the inequality is not satisfied, sampling is needed to be continued until the inequality is satisfied; t is the time interval between the first sampling and the second sampling;
step S2.4.6, calculating the internal leakage Q4 of the important habitable area in units: m is m 3 /h，Q4＝q/C 5 -Q3。
The test gist in step S2.4:
1) The final equilibrium concentration is a theoretical value, and the engineering actual value is 95% or 98% of the theoretical value;
2) The time for 95% of the theoretical final equilibrium concentration is 3/A (A is the ventilation); the time for 98% of the theoretical final equilibrium concentration is 4/A (A is the ventilation);
3) The concentration distribution of trace gas in the important habitable area needs to be uniform every time sampling is carried out;
4) In order to shorten the test time, a method of firstly injecting trace gas intensively and rapidly and then adjusting the injection concentration and speed can be adopted in engineering.
In step S2.4, the method further includes evaluating the result of the area tightness test of the important habitability area by using the constant flow injection method, including the following steps:
step S2.4.7 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.4.8, determining the tracer gas injection flow q; units: ml/h;
Step S2.4.9, calculating uncertainty u (q) =0.29 δ of tracer gas injection flow q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.4.10, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.11, calculating the trace gas concentration C of the air volume measuring point n ＝(C n1 +C n2 +C n3 ) 3; units: ppm; the air volume measuring point is a sampling point arranged on a downstream air pipe of a fan of the ventilation system of the important habitable area, C n1 、C n2 And C n3 Three tracer gas concentrations are obtained on the same air volume measuring point through three independent sampling pipelines;
step S2.4.12, uncertainty u (C) of the trace gas concentration at the air volume measurement point is calculated n )＝0.167δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.13, calculating the fresh air quantity qn=q/C n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；。
Step S2.4.14, calculating uncertainty of the fresh air quantity,units: m is m 3 /h；
Step S2.4.15 the first tracer gas concentration at the sample point of the jth test of the critical habitat is noted C j1i The second trace gas concentration at the sampling point of the j-th test of the important habitat area is marked as C j2i I is more than or equal to 1 and less than or equal to 40; units: ppm; executing n times of tests in total, wherein j is more than or equal to 1 and less than or equal to n;
step S2.4.16 calculating uncertainty of trace gas concentration u (C) j1i )＝u(C j2i )＝0.29δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.17 calculating the equilibrium concentration of the second tracer gas concentration at the sampling point of the jth test of the critical habitatUnits: ppm;
step S2.4.18, calculating the internal leakage of the jth test of the important habitable area
Q j，leak ＝q j，in /C j4p -Q n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；q j，in The j-th test is used for injecting the trace gas injection quantity set on the gas flowmeter of the trace gas;
step S2.4.19, calculate weightUncertainty of the amount of endoleak in the habitatUnits: m is m 3 /h；
Step S2.4.20, calculating the internal leakage of the important habitable areaUnits: m is m 3 /h；
Step S2.4.21 calculating uncertainty of n measurements of internal leakage of the significant habitatUnits: m is m 3 /h；
Step S2.4.21, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.4.22, calculating the integrated uncertainty of n measurements of the internal leakage of the important habitable area: u (Q) e,leak )＝t 95％ *u(Q e,leak ) The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.4.23, concluding: internal leakage test results Q of important habitat e,leak Confidence interval [ -U (Q) e,leak ),U(Q e,leak )]The confidence probability is 95%; units: m is m 3 /h。
The equipment required by the method for testing and evaluating the tightness of the important habitability area of the nuclear power station is as follows:
trace gas injection device, technical essential:
1) The quantitative injection function is realized;
2) The constant flow injection function is provided;
3) The accurate metering can be realized;
4) The sealing performance of the equipment and the accessory pipe fittings is good.
Trace gas automatic sampling device, technical essential:
1) The automatic sampling device has an automatic sampling function;
2) The rapid sampling function is provided;
3) Each sample is representative;
4) The individual samples cannot be confused (the sampling point of each important habitable area is connected to the trace gas automatic sampling device by a separate sampling line).
The device according to the invention is not limited to the examples described in the specific embodiments, and a person skilled in the art obtains other embodiments according to the technical solution of the invention, which also belong to the technical innovation scope of the invention.
Claims (8)
1. A nuclear power station important habitability area tightness test and evaluation method is used for the sealing test of the important habitability area of the nuclear power station and comprises the following steps:
step S1, testing the boundary tightness of an important habitable area;
s2, testing and evaluating the regional tightness of the important habitable area;
the step S2 includes:
step S2.1, arranging sampling points of trace gas in the important habitat area;
step S2.2, measuring the free volume and evaluation of the important habitat by using a tracer gas method;
S2.3, performing area tightness test and evaluation of the important habitable area by adopting a concentration attenuation method;
s2.4, performing area tightness test and evaluation of the important habitable area by adopting a constant flow injection method;
in the step S1, the boundary tightness test of the important habitable area includes the following steps:
s1.1, determining key positions in the boundary of an important habitable area, wherein the key positions need to be subjected to a sealing test; the key positions comprise holes, doors and ventilation pipe networks on the boundary of the important habitable area; the ventilation pipe network comprises a positive pressure pipe section, a negative pressure pipe section, a positive pressure pipe network and a negative pressure pipe network;
s1.2, the sealing test of the hole adopts an ultrasonic method, and the detection equipment is an ultrasonic leak detector; the acceptance criterion is to compare with a reference value, and the reference value should not be exceeded by 5 units;
s1.3, the sealing test of the door adopts an ultrasonic method, and the detection equipment is an ultrasonic leak detector; the acceptance criterion is to compare with a reference value, and the reference value should not be exceeded by 5 units;
s1.4, sealing test of the positive pressure pipe section adopts a soap foam method, and a detection agent is leakage detection liquid; the acceptance criterion is no visible leakage point;
s1.5, sealing test of the negative pressure pipe section adopts a water mist method, and the detection equipment is a water vapor generator; the acceptance criterion is that no visible leakage point exists, and after the negative pressure pipe section is tested to be qualified, a tracer gas method is used for integrally testing the positive pressure pipe network;
S1.6, detecting the air pipe leakage rate of the positive pressure pipe network by adopting a tracer gas method in the sealing test of the positive pressure pipe network, wherein the detection equipment is a gas chromatograph; the acceptance criterion of the air pipe leakage rate is less than or equal to 1 per mill, specifically means that when the ratio of the concentration of the trace gas in the region or the room contained in the important habitability area to the concentration of the trace gas in the positive pressure pipe network is less than or equal to 1 per mill after the trace gas is injected into the positive pressure pipe network, the tightness of the positive pressure pipe network is qualified, otherwise, the tightness of the positive pressure pipe network is not qualified;
s1.7, detecting the air pipe leakage rate of the negative pressure pipe network by adopting a tracer gas method in the sealing test of the negative pressure pipe network, wherein the detection equipment is a gas chromatograph; the acceptance criterion of the air pipe leakage rate is less than or equal to 1 per mill, specifically means that when the ratio of the concentration of the trace gas in the air pipe of the negative pressure pipe network to the concentration of the trace gas in the area or the room contained in the important habitable area is less than or equal to 1 per mill after the trace gas is injected into the area or the room contained in the important habitable area, the tightness of the negative pressure pipe network is qualified, and otherwise, the tightness of the negative pressure pipe network is not qualified.
2. The method for testing and evaluating the tightness of the important habitability area of a nuclear power plant according to claim 1, wherein the step S2.1 is to arrange a sampling point of a trace gas in the important habitability area, and comprises the following steps:
A step S2.1.1 of defining the composition of the building rooms of the important habitable area;
a step S2.1.2, defining an airflow organization form of each room of the important habitability area, wherein the airflow organization form refers to an inflow position and an outflow position of airflow in the room;
a step S2.1.3 of defining an area of a cross-section of flowing air perpendicular to the direction of air flow in each room of the important habitability area;
step S2.1.4, calculating the number of the sampling points of each room, and determining the positions of the sampling points;
in step S2.1.5, an arrangement scheme of trace gas sampling points in important habitable areas is formulated, and the principle is that key rooms are controlled independently and general rooms are controlled overall.
3. A method for testing and evaluating the tightness of an important habitability area of a nuclear power plant as defined in claim 2 wherein in said step S2.2, the free volume of said important habitability area is measured using a tracer gas method comprising the steps of:
step S2.2.1, injecting a quantitative amount of the tracer gas into the important habitat, wherein the injection amount of the tracer gas is denoted as Q, and the unit is: ml;
step S2.2.2, uniformly mixing the trace gas in the important habitability area by adjusting the operation state of a ventilation system of the important habitability area;
Step S2.2.3, sampling through the sampling points of the important habitable areas to obtain the equilibrium concentration of the trace gas; the equilibrium concentration is noted as C, units: ppm;
step S2.2.4, obtaining the free volume of the important habitat area according to the ratio of the injection amount of the trace gas to the equilibrium concentration, wherein the formula is V=Q/C; the free volume is noted as V, units: m is m 3 。
4. A method for testing and evaluating the tightness of an important habitability area of a nuclear power plant as defined in claim 3, further comprising the step of evaluating the results of the free volume of said important habitability area in said step S2.2, comprising the steps of:
step S2.2.5 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.2.6, determining the tracer gas injection flow q; units: ml/h;
step S2.2.7, calculating uncertainty u (q) =0.29 δ of the tracer gas injection flow rate q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.2.8, determining the resolution δ of the timer 2 The timer is used for determining the tracer gas injection time t; the injection time of the tracer gas is automatically timed by an injection device with a calculation program, and the unit is as follows: s;
Step S2.2.9, determining tracer gas injection time t; units: s;
step S2.2.10, calculating uncertainty u (t) =0 of the trace gas injection time; units: s;
step S2.2.11, calculating the trace gas injection quantity q=q×t/3600; units: ml;
step S2.2.12, calculating uncertainty u (Q) =tu (Q)/3600 of the trace gas injection amount Q; units: ml;
step S2.2.13 calculating the equilibrium concentration of the tracer gasUnits: ppm; c (C) vi The trace gas concentration of the sampling points in the important habitat area is indicated, the number of the sampling points is 40, i is more than or equal to 1 and less than or equal to 40;
step S2.2.14, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.2.15 calculating uncertainty u (C) v )＝0.046*δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.2.16 calculating uncertainty of free volume of the significant habitatUnits: m is m 3 ；
Step S2.2.17 calculating uncertainty of n measurements of free volume of the significant habitable area
Step S2.2.18, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.2.19, calculating the free volume n-time measurement integrated uncertainty of the significant habitability area: u (Ve) =t95% > U (Ve); units: m is m 3 ；
Step S2.2.20, concluding: the free volume test result Ve of the important habitat area, confidence interval [ -U (Ve), U (Ve)]The confidence probability is 95%; units: m is m 3 。
5. The method for testing and evaluating the tightness of the important habitability area of a nuclear power plant as recited in claim 4, wherein in the step S2.3, the area tightness test of the important habitability area is performed by adopting a concentration decay method, and the method comprises the following steps:
step S2.3.1, measuring the air supply quantity of the important habitability area and marking as Q1;
a step S2.3.2 of introducing a quantitative tracer gas into the important habitat;
step S2.3.3, after the balance of the tracer gas in the significant habitability area, performing a first sampling via the sampling point of the significant habitability area to obtain a first balance concentration of the tracer gas in the significant habitability area, denoted as C 1 Units: ppm;
step S2.3.4, after waiting T hours, performing a second sampling through said sampling points of said critical habitat to obtain a second equilibrium concentration of said tracer gas within said critical habitat, denoted C 2 Units: ppm;
step S2.3.5, calculating the ventilation a of the important habitable area in units of: "times/h", a= (lnC) 1 -lnC 2 )/T；
Step (a)S2.3.6, calculating the internal leakage Q2 of the important habitable area in units of: m is m 3 /h，Q2＝A*V-Q1。
6. The method for testing and evaluating the tightness of the important habitability area of a nuclear power plant as recited in claim 5, further comprising the step of evaluating the result of the testing of the tightness of the area of the important habitability area by a concentration decay method in step S2.3, comprising the steps of:
step S2.3.7 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.3.8, determining the tracer gas injection flow q; units: ml/h;
step S2.3.9, calculating uncertainty u (q) =0.29 δ of the tracer gas injection flow rate q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.3.10, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.11, calculating the trace gas concentration C of the air volume measuring point n ＝(C n1 +C n2 +C n3 ) 3; units: ppm; the air volume measuring point is a sampling point arranged on a downstream air pipe of a fan of the ventilation system of the important habitability area, and the C n1 The C is n2 And said C n3 Three tracer gas concentrations are obtained on the same air volume measuring point through three independent sampling pipelines;
Step S2.3.12, calculating uncertainty u (C) of the trace gas concentration at the air volume measurement point n )＝0.167δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.13, calculating the fresh air quantity qn=q/C n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.14, calculating the uncertainty of the fresh air quantity,units: m is m 3 /h；
Step S2.3.15, determining an interval time T between the first sampling and the second sampling of the sampling points of the important habitable region; units: h, performing H;
step S2.3.16, calculating uncertainty u (T) =0 of the T;
step S2.3.17 the first tracer gas concentration at the sampling point of the significant habitability area is noted as C 1i The second trace gas concentration at the sampling point of the significant habitability area is noted as C 2i I is more than or equal to 1 and less than or equal to 40; units: ppm;
step S2.3.18 calculating uncertainty u (C) of the trace gas concentration at the sampling point of the significant habitability area 1i )＝u(C 2i )＝0.29δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
in step S2.3.19 the process steps are performed,
calculating the tracer gas equilibrium concentration at said sampling point of said significant habitable area in a first samplingUnits: ppm;
C j1i the trace gas concentration at the ith sampling point is sampled for the jth test 1 st time; units: ppm;
calculating the tracer gas equilibrium concentration at said sampling point of said significant habitable area in a second sub-sample Units: ppm;
C j2i the trace gas concentration at the ith sampling point is sampled for the jth test 2 nd time; units: ppm; the number of the sampling points is 40, i is more than or equal to 1 and less than or equal to 40;
step S2.3.20, calculating uncertainty u (C) 1p )＝u(C 2p )＝0.046*δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.3.21 calculating the jth test mean ventilation A of said important habitable area j ＝(lnC 1p -lnC 2p ) T; units: secondary/h;
step S2.3.22, calculating the weightUncertainty of mean ventilation rate for jth trial of habitable areaUnits: secondary/h;
step S2.3.23, calculating the j-th test inner leakage Q of the important habitability area j，leak ＝A j *V-Q n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.24 calculating uncertainty in leak in the jth test of the important habitat areaUnits: m is m 3 /h；
Step S2.3.25 calculating uncertainty of n measurements of internal leakage of said significant habitatUnits: m is m 3 /h；
Step S2.3.26, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.3.27, calculating the integrated uncertainty of n measurements of the internal leakage of the important habitable area: u (Q) e,leak )＝t 95％ *u(Q e,leak ) The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.3.28, concluding: internal leakage test results Q of the important habitat e,leak Confidence interval [ -U (Q) e,leak ),U(Q e,leak )]The confidence probability is 95%; units: m is m 3 /h。
7. The method for testing and evaluating the tightness of the important habitability area of a nuclear power plant as recited in claim 6, wherein in the step S2.4, the area tightness test of the important habitability area is performed by adopting a constant flow injection method, and the method comprises the following steps:
step S2.4.1, measuring the air supply quantity of the important habitability area, and recording as Q3, unit: m is m 3 /h；
Step S2.4.2, introducing quantitative tracer gas into the important habitat, wherein the injection flow rate of the tracer gas is denoted as q, and the unit is: ml/h;
step S2.4.3, when the injection time of the trace gas reaches the theoretical time of the final equilibrium concentration, performing a first sampling by the sampling point of the important habitability area to obtain a first equilibrium concentration of the trace gas in the important habitability area, denoted as C 3 Units: ppm;
step S2.4.4, at 15min intervals, performing a second sampling by said sampling points of said important habitat to obtain a second equilibrium concentration of said tracer gas in said important habitat, denoted C 4 Units: ppm;
step S2.4.5, if inequality (C 4 -C 3 ) T < 0.05 q/V is true, C 4 Namely the final equilibrium concentration C 5 The method comprises the steps of carrying out a first treatment on the surface of the If the inequality is not satisfied, sampling is needed to be continued until the inequality is satisfied; the T is the time interval between the first sampling and the second sampling;
Step S2.4.6, calculating the internal leakage Q4 of the important habitable area in units of: m is m 3 /h，Q4＝q/C 5 -Q3。
8. The method for testing and evaluating the tightness of the important habitability area of a nuclear power plant as recited in claim 7, further comprising the step of evaluating the results of the regional tightness testing of the important habitability area by a constant flow injection method in step S2.4, wherein the method comprises the following steps:
step S2.4.7 determining a resolution δ of a gas flow meter for injecting a trace gas 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/h;
step S2.4.8, determining the tracer gas injection flow q; units: ml/h;
step S2.4.9, calculating uncertainty u (q) =0.29 δ of the tracer gas injection flow rate q 1 The method comprises the steps of carrying out a first treatment on the surface of the Units: ml/min;
step S2.4.10, determining a resolution δ of a trace gas analyzer for trace gas analysis 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.11, calculating the trace gas concentration C of the air volume measuring point n ＝(C n1 +C n2 +C n3 ) 3; units: ppm; the air volume measuring point is a sampling point arranged on a downstream air pipe of a fan of the ventilation system of the important habitability area, and the C n1 The C is n2 And said C n3 Three tracer gas concentrations are obtained on the same air volume measuring point through three independent sampling pipelines;
Step S2.4.12, calculating uncertainty u (C) of the trace gas concentration at the air volume measurement point n )＝0.167δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.13, calculating the fresh air quantity qn=q/C n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.4.14, calculating the uncertainty of the fresh air quantity,units: m is m 3 /h；
Step S2.4.15 the first tracer gas concentration at the sampling point of the jth test of the critical habitat is designated C j1i The second trace gas concentration at the sampling point of the jth test of the critical habitat is designated C j2i I is more than or equal to 1 and less than or equal to 40; units: ppm; executing n times of tests in total, wherein j is more than or equal to 1 and less than or equal to n;
step S2.4.16 calculating uncertainty u (C) of the trace gas concentration at the sampling point of the significant habitability area j1i )＝u(C j2i )＝0.29δ 3 The method comprises the steps of carrying out a first treatment on the surface of the Units: ppm;
step S2.4.17 calculating an equilibrium concentration of a second tracer gas concentration for said sampling point of a jth test of said critical habitatUnits: ppm;
step S2.4.18, calculating the internal leakage of the jth test of the important habitability area
Q j，leak ＝q j，in /C j4p -Q n The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h; the q is j，in The j-th test is used for injecting the trace gas injection quantity set on the gas flowmeter of the trace gas;
step S2.4.19, calculating uncertainty of the inner leakage of the important habitable area Units: m is m 3 /h；
Step S2.4.20, calculating the internal leakage of the important habitable region
Units: m is m 3 /h；
Step S2.4.21 calculating uncertainty of n measurements of internal leakage of said significant habitatUnits: m is m 3 /h；
Step S2.4.22, determining t corresponding to the t distribution when the degree of freedom is (n-1) 95％ A value;
step S2.4.23, calculating the integrated uncertainty of n measurements of the internal leakage of the important habitable area: u (Q) e,leak )＝t 95％ *u(Q e,leak ) The method comprises the steps of carrying out a first treatment on the surface of the Units: m is m 3 /h；
Step S2.4.24, concluding: internal leakage test results Q of the important habitat e,leak Confidence interval [ -U (Q) e,leak ),U(Q e,leak )]The confidence probability is 95%; units: m is m 3 /h。
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| PCT/CN2022/128274 WO2023093456A1 (en) | 2021-11-25 | 2022-10-28 | Method for testing and evaluating sealing performance of important residence zone of nuclear power station |
| ARP220103183A AR127717A1 (en) | 2021-11-25 | 2022-11-18 | METHOD FOR CONDUCTING A TIGHTNESS TEST AND EVALUATION FOR A SIGNIFICANT RESIDENTIAL AREA OF A NUCLEAR POWER PLANT |
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| US10690562B2 (en) * | 2016-10-18 | 2020-06-23 | The Regents Of The University Of Colorado, A Body Corporate | Apparatus and methods for location and sizing of trace gas sources |
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| JP2008209220A (en) * | 2007-02-26 | 2008-09-11 | Denso Corp | Leak inspection method and device |
| JP2015161555A (en) * | 2014-02-27 | 2015-09-07 | 株式会社フクダ | Leak test method and device |
| CN107132006A (en) * | 2016-02-26 | 2017-09-05 | 中国辐射防护研究院 | Leakage quantity measuring method in a kind of master control room |
| CN111681793A (en) * | 2020-04-14 | 2020-09-18 | 中国核电工程有限公司 | Nuclear power plant master control room leakage rate test simulation test device and method |
| CN113358174A (en) * | 2021-05-18 | 2021-09-07 | 国核电站运行服务技术有限公司 | Space free volume measuring method |
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