CN105092182A - Vacuum helium leak checking method for condenser at power operation phase of nuclear power plant - Google Patents
Vacuum helium leak checking method for condenser at power operation phase of nuclear power plant Download PDFInfo
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- CN105092182A CN105092182A CN201510497774.4A CN201510497774A CN105092182A CN 105092182 A CN105092182 A CN 105092182A CN 201510497774 A CN201510497774 A CN 201510497774A CN 105092182 A CN105092182 A CN 105092182A
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Abstract
The invention provides a vacuum helium leak checking method for a condenser at a power operation phase of a nuclear power plant. According to the method, helium is sprayed to a vacuum boundary to be tested, a helium mass spectrograph is connected to a condenser vacuum pump exhaust pipeline to detect the helium flow value, and whether the tested area has leak can be judged and the magnitude of a leak point can be estimated according to the change condition of the helium flow value, so that the leak point can be accurately positioned. Compared with the prior art, the vacuum helium leak checking method for the condenser at the power operation phase of the nuclear power plant has the advantages of convenience in operation, high sensitivity, high leak checking efficiency, no harm to human body and the like.
Description
Technical field
The invention belongs to nuclear power station debugging field, more particularly, the present invention relates to the method for a kind of nuclear power plant Power operation stage condenser vacuum leakage detection.
Background technology
Condenser vacuum is the most important end condition of nuclear power plant's genset, directly affects the thermal efficiency of cycle of nuclear power plant, and the vacuum tightness that thus guarantee condenser is enough is concerning the economic benefit of whole nuclear power plant.Because in power of the assembling unit operational process, condenser keeps high negative pressure state always, cause the main cause of condenser dissolved oxygen vacuum difference to be that coupled system or equipment exists leak source, air enters and causes.
In published nuclear power plant, the power of the assembling unit run before conventional island cold conditions vacuumize with hot vacuumize test time, because field apparatus pipe insulation cotton is not all installed, most equipment does not start, and therefore testing crew searches vacuum boundary leak source mainly through audition method, observation, separate row division, method with plastic film etc.
But in the power of the assembling unit operation phase, the cotton and iron sheet parcel of the pipeline of the main vacuum boundary of secondary circuit, equipment insulation, full plant all comes into operation, and therefore cannot search potential and newly-increased leak source by conventional method.Specifically, if still use above-mentioned conventional method to carry out vacuum finding leak source, then there will be following problem: the equipment 1) owing to running in factory building is numerous, and noise mixes, therefore cannot tell the air-suction-noise of vacuum leak source thus judge leak source general orientation; 2) due to pipeline, equipment insulation cotton and the iron sheet parcel of most of vacuum boundary, vacuum leak source cannot directly be searched by naked eyes; 3) because unit is in the Power operation stage, all devices valve all must be in claimed condition, cannot get rid of vacuum leak source by isolated part pipe-line equipment; 4) for trickle leak source, because the insulation bale of cotton is wrapped up in, cannot be verified by the method for cover film; 5) because Power operation stage on-the-spot all construction scaffoldings are eliminated, most of vacuum boundary region cannot be close; 6) because equipment, number of tubes are huge, need to drop into a large amount of manpower, but cannot find out vacuum leak source at short notice, be difficult to realize reducing the object bringing economic loss thus.
Summary of the invention
The object of the invention is to: provide a kind of easy and simple to handle, highly sensitive, leakage detection efficiency is high, nuclear power plant's Power operation stage condenser vacuum helium leak detection to human body fanout free region, significantly to improve efficiency and the economy of conventional island secondary circuit vacuum leakage detection.
To achieve these goals, the invention provides a kind of nuclear power plant Power operation stage condenser vacuum helium leak detection, it comprises the following steps:
1) preparatory stage: prepare helium flusher and a helium mass spectrometer, and the probe of helium mass spectrometer is connected with the sampling line on condenser vacuum pumping pump exhaust line;
2) by helium mass spectrometer reading change within a predetermined period of time, leakage detection: utilize helium flusher to spray helium to the vacuum boundary to be tested that may there is leak source, judges whether test zone exists leak source;
3) accurately locate: if test zone exists leak source, then estimate leak source size by the contrast of helium mass spectrometer full-scale reading and referential data, in conjunction with test zone structure analysis, realize the accurate location of leak source.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, described step 2) judge that the standard whether test zone exists leak source is: in the predetermined amount of time after having sprayed helium, if the reading order of magnitude of helium mass spectrometer keeps being less than or equal to 10
-7, then think there is no leak source in test zone; If the reading of helium mass spectrometer is changed to the order of magnitude be more than or equal to 10
-6, then illustrate in this test zone to there is leak source.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, described referential data is in step 1) set up, the method setting up referential data is: a, an artificial manufacture leak source in vacuum boundary to be detected, utilize helium flusher to spray helium to leak source in predefined conditions, the record full-scale reading of helium mass spectrometer and the size of leak source are as one group of referential data; B, repeats the operation of a step, sets up the referential data of the different size leak source of at least two groups; C, closes artificial leak source.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, and described predetermined condition at least comprises the pressure of helium, spraying time and sprinkling distance.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, and sprays the condition of helium, need consistent with the predetermined condition of spraying helium when setting up referential data, to ensure the accuracy estimated leak source size during described leakage detection.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, described step 1) before setting up referential data, also need the background reading first recording helium; When setting up referential data and carrying out formal leakage detection, after each sprinkling helium, after all needing the reading waiting for helium mass spectrometer to recover background reading, could start to spray helium next time.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, at the bottom of described minute book, the process of reading is: start helium mass spectrometer, open the sample cock of sampling line, read the concentration values of helium mass spectrometer, the background data of record helium.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, and the group number of described referential data is preferably 3 ~ 8 groups.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, the method of the artificial leak source of described manufacture is preferably, choose a hydrophobic valve as test valve at vacuum pump inlet, certain aperture area that opens it is as artificial leak source; Regulate the aperture of test valve can change the size of artificial leak source.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, described step 2) when carrying out leakage detection, be that vacuum boundary to be tested for the secondary circuit that likely there is leak source is divided into multiple test zone, and then helium leakage detection is sprayed to the vacuum boundary of each test zone.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, and described helium flusher comprises helium gas cylinder, the reduction valve be arranged on helium gas cylinder, export the connecting hose be connected and the expansion link be connected with the outlet of connecting hose with reduction valve.
One as nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is improved, and the reading of described helium mass spectrometer refers to concentration values.
Compared with prior art, nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is by spraying helium to vacuum boundary to be tested, and detect helium gas flow numerical value in condenser vacuum pumping pump gas exhaust duct place connection helium mass spectrometer, namely judge whether test zone exists by the situation of change of helium gas flow numerical value leak and estimate leak source size, achieve the accurate location of leak source.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection and Advantageous Effects thereof are described in detail, wherein:
Fig. 1 is the equipment connection schematic diagram of nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection.
Embodiment
In order to make, object of the present invention, technical scheme and Advantageous Effects are more clear to be understood, below in conjunction with the drawings and specific embodiments, is further elaborated to the present invention.Should be understood that, the embodiment described in this instructions is only used to explain the present invention, is not to limit the present invention.
Refer to Fig. 1, nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection comprises the following steps:
1) preliminary work: relevant device is transported to scene, and the interim storage area of apparatus for establishing and workspace; Required relevant device comprises PhonixL300 helium mass spectrometer 10, the helium gas cylinder 20 of high-purity helium, reduction valve 22, connecting hose 24, expansion link 26, rapid-acting coupling, intercom etc. is housed; Rapid-acting coupling is installed at sampling line 32 place on condenser vacuum pumping pump 30 exhaust line, utilizes rapid-acting coupling to be connected with sampling line 32 by the probe of helium mass spectrometer 10; Powered to helium mass spectrometer 10 by temporary source; After helium gas cylinder 20 is installed reduction valve 22, the connecting hose 24 of sufficient length in connection, the outlet connection expansion link 26 of connecting hose 24;
2) the background reading of helium is recorded: after above-mentioned preliminary work, start helium mass spectrometer 10, open the sample cock 320 of sampling line 32, arrange operator A to read the concentration values of helium mass spectrometer 10, the background data of record helium (is generally 10
-8the order of magnitude);
3) set up referential data: before formally starting vacuum helium leakage detection, need first to set up this unit referential data, so that by judging leak source size with the contrast of measured value, for location leak source provides more information; The process setting up referential data is: a, is treating that the vacuum boundary appropriate position of leakage detection artificially manufactures the known leak source of a size, and as chosen a hydrophobic valve at vacuum pump inlet as test valve, open it certain opening; B, in predefined conditions, uses expansion link 26 to spray helium to leak source, the full-scale reading of record helium mass spectrometer 10 and the aperture area of test valve; Predetermined condition herein refers to that the pressure, spraying time, sprinkling distance etc. of helium are to the influential parameter of leak source helium soakage; C, according to actual needs, tests out the referential data of multiple different size leak source, is preferably 3 ~ 8 groups, as regulated the aperture of test valve and recording corresponding helium mass spectrometer 10 Cmax reading; D, closes test valve, realizes the shutoff of artificial leak source;
4) vacuum boundary 40 to be tested for the secondary circuit that likely there is leak source is divided into multiple test zone, so that leakage detection one by one;
5) helium leakage detection is sprayed one by one to test zone, concrete mistake is called: a, expansion link is used to spray helium to one of them test zone, spraying condition is identical with the spraying condition setting up referential data, during sprinkling, need to arrange operator B to control reduction valve, all identical with the time (as 8s) to ensure each pressure sprayed, also need to arrange operator C to spray helium, identical to ensure each distance (as 20cm) of spraying, operator A, to link up each other by intercom between B, C; B, sprayed in helium 5 minutes, if helium mass spectrometer 10 reading that operator A is read does not have significant change, (order of magnitude is less than or equal to 10
-7) then thinking there is no leak source in this test zone, can prepare to carry out leakage detection to next test zone; If obviously (order of magnitude is more than or equal to 10 in the reading change of helium mass spectrometer 10
-6), then illustrate in this test zone to there is leak source, in this case by helium mass spectrometer 10 full-scale reading of record and the contrast of referential data, the approximate size of leak source in this test zone can be learnt, again in conjunction with test zone interior conduit, device structure analysis, the accurate location of leak source can be realized; C, after completing the leakage detection of a test zone, waits for that the reading of helium mass spectrometer 10 recovers background reading, then starts to carry out leakage detection to next test zone, until all test zones check complete.
Known by describing above, nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection is divided into multiple test zone vacuum boundary 40 to be tested for all secondary circuits, expansion link is used to spray quantitative helium one by one, connect helium mass spectrometer 10 simultaneously at condenser vacuum pumping pump 30 gas exhaust duct place and detect helium gas flow numerical value, whether changed by helium gas flow numerical value and judge whether test zone leaks, estimate leak source size according to numerical value change size, and combine with test zone structure analysis and achieve the accurate location of leak source.
Compared with prior art, nuclear power plant of the present invention Power operation stage condenser vacuum helium leak detection at least has the following advantages:
1) problem that existing leak detection was no longer suitable in the power of the assembling unit operation phase is overcome;
2) without the need to changing current device state, " can't harm " characteristic is possessed;
3) use connecting hose 24 and expansion link 26 helium to be sprayed onto the vacuum boundary 40 all to be tested of secondary circuit, the high sensitivity of helium mass spectrometer 10 can ensure to identify all leak sources simultaneously, has very high degree of accuracy;
4) by with referential data compare the size can estimating leak source, provide key message for accurately locating leak source;
5) complete once to verify to all vacuum boundary 40 to be tested and minimumly only need 3 people just can complete for 2 days, add the low cost of high-purity helium, make the method possess high economy high efficiency simultaneously.
According to above-mentioned principle, the present invention can also carry out suitable change and amendment to above-mentioned embodiment.Therefore, the present invention is not limited to embodiment disclosed and described above, also should fall in the protection domain of claim of the present invention modifications and changes more of the present invention.In addition, although employ some specific terms in this instructions, these terms just for convenience of description, do not form any restriction to the present invention.
Claims (12)
1. nuclear power plant's Power operation stage condenser vacuum helium leak detection, is characterized in that, comprise the following steps:
1) preparatory stage: prepare helium flusher and a helium mass spectrometer, and the probe of helium mass spectrometer is connected with the sampling line on condenser vacuum pumping pump exhaust line;
2) by helium mass spectrometer reading change within a predetermined period of time, leakage detection: utilize helium flusher to spray helium to the vacuum boundary to be tested that may there is leak source, judges whether test zone exists leak source;
3) accurately locate: if test zone exists leak source, then estimate leak source size by the contrast of helium mass spectrometer full-scale reading and referential data, in conjunction with test zone structure analysis, realize the accurate location of leak source.
2. nuclear power plant according to claim 1 Power operation stage condenser vacuum helium leak detection, it is characterized in that: described step 2) judge that the standard whether test zone exists leak source is: in the predetermined amount of time after having sprayed helium, if the reading order of magnitude of helium mass spectrometer keeps being less than or equal to 10
-7, then think there is no leak source in test zone; If the reading of helium mass spectrometer is changed to the order of magnitude be more than or equal to 10
-6, then illustrate in this test zone to there is leak source.
3. nuclear power plant according to claim 1 Power operation stage condenser vacuum helium leak detection, it is characterized in that: described referential data is in step 1) set up, the method setting up referential data is: a, an artificial manufacture leak source in vacuum boundary to be detected, utilize helium flusher to spray helium to leak source in predefined conditions, the record full-scale reading of helium mass spectrometer and the size of leak source are as one group of referential data; B, repeats the operation of a step, sets up the referential data of the different size leak source of at least two groups; C, closes artificial leak source.
4. nuclear power plant according to claim 3 Power operation stage condenser vacuum helium leak detection, is characterized in that: described predetermined condition at least comprises the pressure of helium, spraying time and sprinkling distance.
5. nuclear power plant according to claim 3 Power operation stage condenser vacuum helium leak detection, it is characterized in that: the condition of spraying helium during described leakage detection, need consistent with the predetermined condition of spraying helium when setting up referential data, to ensure the accuracy estimated leak source size.
6. nuclear power plant according to claim 3 Power operation stage condenser vacuum helium leak detection, is characterized in that: described step 1) before setting up referential data, also need the background reading first recording helium; When setting up referential data and carrying out formal leakage detection, after each sprinkling helium, after all needing the reading waiting for helium mass spectrometer to recover background reading, could start to spray helium next time.
7. nuclear power plant according to claim 4 Power operation stage condenser vacuum helium leak detection, it is characterized in that: at the bottom of described minute book, the process of reading is: start helium mass spectrometer, open the sample cock of sampling line, read the concentration values of helium mass spectrometer, the background data of record helium.
8. nuclear power plant according to claim 3 Power operation stage condenser vacuum helium leak detection, is characterized in that: the group number of described referential data is preferably 3 ~ 8 groups.
9. nuclear power plant according to claim 3 Power operation stage condenser vacuum helium leak detection, it is characterized in that: the method for the artificial leak source of described manufacture is preferably, choose a hydrophobic valve as test valve at vacuum pump inlet, certain aperture area that opens it is as artificial leak source; Regulate the aperture of test valve can change the size of artificial leak source.
10. nuclear power plant according to any one of claim 1 to 9 Power operation stage condenser vacuum helium leak detection, it is characterized in that: described step 2) when carrying out leakage detection, be that vacuum boundary to be tested for the secondary circuit that likely there is leak source is divided into multiple test zone, and then helium leakage detection is sprayed to the vacuum boundary of each test zone.
11. nuclear power plant according to any one of claim 1 to 9 Power operation stage condenser vacuum helium leak detections, is characterized in that: described helium flusher comprises helium gas cylinder, the reduction valve be arranged on helium gas cylinder, export the connecting hose be connected and the expansion link be connected with the outlet of connecting hose with reduction valve.
12. nuclear power plant according to any one of claim 1 to 9 Power operation stage condenser vacuum helium leak detections, is characterized in that: the reading of described helium mass spectrometer refers to concentration values.
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| CN105910771A (en) * | 2016-05-30 | 2016-08-31 | 华电电力科学研究院 | Helium vacuum leak checking device |
| CN113390580A (en) * | 2021-07-10 | 2021-09-14 | 湖南华菱湘钢节能发电有限公司 | Condenser vacuum on-line quick leak detection method |
| CN114018494A (en) * | 2021-10-27 | 2022-02-08 | 中广核检测技术有限公司 | Nuclear condenser tracing and leakage detecting equipment test simulation system and method |
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Application publication date: 20151125 |