CN205067171U - Fuel rod fission gas pressurization collection device - Google Patents
Fuel rod fission gas pressurization collection device Download PDFInfo
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- CN205067171U CN205067171U CN201520875393.0U CN201520875393U CN205067171U CN 205067171 U CN205067171 U CN 205067171U CN 201520875393 U CN201520875393 U CN 201520875393U CN 205067171 U CN205067171 U CN 205067171U
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Abstract
The utility model discloses a fuel rod fission gas pressurization collection device, (1) is counted through tube coupling U type mercury respectively in the bottom and the top in collection chamber, and the collection chamber is passed through pipeline B (7) and is introduced the fission gas, and mercury chamber, cushion flask (5) and sampling bottle (2) are still connected respectively to the collection chamber, and cushion flask (5) are still emptied and have been opened fuel rod fission gas pressurization collection technology through pipeline G (14) connection atmosphere or evacuating device. The beneficial effects of the utility model are that: ensure the to fission security of gas collection operation, adopt ground -breaking pressure differential measuring technique both to increase gas collection effectively and rate, guarantee the measuring accuracy again, establish brand -new fission gas collection technology, realized that effective pressure boost of fuel rod postose fission gas sample is collected.
Description
Technical field
The utility model relates to fission gas analytical approach field, particularly, relates to fuel rod fission gas pressurized collection device.
Background technology
Current, China's nuclear technology is fast-developing, and fission gas constituent analysis is a kind of important technical indicator of test New-type fuel element irradiation behaviour.Fission gas analysis of components mainly adopts gas chromatographic analysis, and its analyst coverage and sensitivity for analysis depend on two principal elements: one is each gas componant volume ratio, and current gas chromatograph Sensitivity is 1 × 10
-5, cannot detect lower than the gas of this number percent; Two is the pressure of gaseous sample, and after the release of fuel rod fission gas, because releasing means system pipeline volume is always far longer than the cavity volume of fuel rod, after fission gas release, pressure can be reduced to 0.01 ~ 0.001 of original pressure.Due to measured zone and the difference of hot cell regional environment and the singularity of Analysis On Gaseous Constituents system, current most fission gas Analysis On Gaseous Constituents adopts sample analysis, after namely gas bottle being collected from hot cell, delivers to assay office analysis.For reducing negative pressure to the impact of gas sample collection, generally can take two kinds of technology solutions, a kind of is the inert gas (often having He) being filled with stable chemical nature in advance, improve the pressure of gaseous sample, another kind is the direct pressure gas sample of form adopting liquid extruding, improves the pressure of gaseous sample.Last mode is improve the additional a large amount of gas of pressure, primary fissure becomes gas componant number percent and can significantly reduce, require very high to the measurement sensistivity of gas chromatograph, the risk that existence cannot be measured, second method is due to direct weighting, do not introduce foreign gas, require low to the measurement sensistivity of gas chromatograph.
PWR Fuel element is being carried out for current China and is reclaiming uranium for the research and development of heavy water reactor fuel element and irradiation demonstration test, belong to China first, the release rate of fission gas and burst size cannot accurately be estimated, and cannot accurately judge whether to arrive chromatographic sensitivity.For ensureing the accuracy and the authenticity that reclaim uranium fission gas analysis, direct supercharge method is adopted to gas sample collection.Early stage domestic and international all employing glass system and mercury medium, but there is larger security risk, one is glass system complex structure, belong to hard and crisp material, once broken, easily cause mercury to splash, mercury belongs to extremely toxic substance, there is potential security risk to operating personnel.For addressing this problem, carry out the research that fission gas collects supercharging technology.
Utility model content
Technical problem to be solved in the utility model is to provide and a kind ofly increases gas collection rate, measures fuel rod fission gas pressurized collection device accurately.
The technical scheme in the invention for solving the above technical problem is:
A kind of fuel rod fission gas pressurized collection device, comprise U-shaped mercury meter, sampling jar, receiving flask, mercury bottle and surge flask, receiving flask has airtight collecting chamber, mercury bottle has airtight mercury chamber, mercury is loaded with mercury in chamber, receiving flask is connected to pipeline A, pipeline B, pipeline C, pipeline D, pipeline E and pipeline F, the bottom of collecting chamber connects the openend A of U-shaped mercury meter by pipeline A, another openend B of U-shaped mercury meter is communicated with air, collecting chamber introduces fission gas by pipeline B, collecting chamber connects the bottom in mercury chamber by pipeline C, the top of collecting chamber connects the openend A of U-shaped mercury meter by pipeline D, collecting chamber connects surge flask by pipeline E, collecting chamber connects sampling jar by pipeline F, pipeline E also connects the top in mercury chamber by pipeline H, pipeline E is provided with valve A in the part of collecting chamber, pipeline F is provided with valve B, described surge flask connects air or vacuum extractor by pipeline G.
The utility model solves on the basis not changing fission gas composition ratio, realizes the collection of micro-fission gas, measurement, transhipment and analytical technology requirement.
Sampling jar is for depositing gaseous sample to be analyzed; Temporarily collecting chamber deposits from system pipeline fission gas out; Mercury chamber is used for depositing mercury, and general volume is greater than collecting chamber; The gaseous tension in sampling jar measured by the U-shaped vacuum meter of single radial cut; When valve B is for ensureing to vacuumize at the beginning of collection system and accident condition time mercury safety, prevent other space of the system of entering.
Preferably, one end of pipeline G connecting tee pipe, the other two ends of this three-way pipe connect air and vacuum extractor respectively by pipeline, and the pipeline of three-way pipe connection air and vacuum extractor is provided with needle-valve, utilize needle-valve carry out trace to the gas flow of vacuum system and regulate continuously, be configured with the surge flask of large volume, ensure liquid level steadily movement up and down, make collection handling safety controlled, realize micro-flow regulation technology.Metering pin valve and surge flask reduce vacuum system and blowdown gas flow, ensures security and the stationarity of operation.
Preferably, pipeline A, pipeline B and pipeline C are connected to the bottom of receiving flask, pipeline A and pipeline B with the connecting portion of receiving flask is and the horizontal tube paralleled at the bottom of receiving flask, thus the mercury be beneficial in mercury chamber enters receiving flask bottom receiving flask, and the mercury entered can sealing pipeline B and pipeline C as early as possible, pipeline D, pipeline E and pipeline F are connected to the top of receiving flask, be beneficial to collection or the discharge of gas, one end of the openend A connecting tee pipe of U-shaped mercury meter, the other two ends of this three-way pipe are respectively by pipeline connecting pipe road A and pipeline D.
Adopt the U-shaped mercury vacuum gauge of single radial cut, achieve the Measurement accuracy of gas sample pressure after collecting, increase gas collection rate.
The stainless steel self sealing structure design of polishing in adopting and tiny flow quantity adjustment structure, after achieving irradiation, the supercharging of fuel rod fission gas is collected, and ensure that security.
The utility model supercharging collection process comprises bleed, sealing type pressure and gas sample pressure and measures three component parts.In collection process technology, bleed is incorporated in collecting chamber by reducing mercury liquid level by vacuum system and flow needle-valve by the fission gas be distributed in system pipeline; Sealing type pressure is by regulating discharging needle-valve to improve mercury liquid level by the gas press-in sampling jar in collecting chamber; Pressure survey is after collection has operated, and adopts the pressure of gas in single radial cut U-shaped measurement amount sampling jar.
During practical operation, the burst size of based on fuel element uranium loading amount and burnup estimation fission gas, calculates the pressure limit after collection system release, selects according to pressure limit the U-shaped mercury vacuum gauge of single radial cut meeting range.
Collection system vacuumizes by the utility model before fission gas is introduced from acanthopore chamber, gets rid of gas and the adsorbed gas of part inwall in pipeline, reduces foreign gas to the impact of gas composition analysis; Then fission gas is introduced collection system, regulates the liquid level of mercury cell, make fission gas collecting chamber automatically and other line seal isolate, subsequently fission gas is pressed into sample collection bottle; Close sample collection bottle, mercury liquid level is declined, and automatically open pipe system and be communicated with fission gas collecting chamber, the fission gas in pipe system enters collecting chamber again, regulates mercury liquid level to raise, carries out collection again.Collected by 3 times, at least can by the fission gas of 90% income sampling jar, the pressure of the fission gas in sampling jar depends on the burst size of fission gas and the size of sampling jar, pressure ratio is the ratio of system pipeline volume and sampling jar volume (5ml ~ 80ml), and pressure ratio scope is generally between 6 ~ 100; Residual gas in pipeline is sent hot cell housing back to by vacuum system and is entered exhaust system.Take out fission gas sampling jar, send into gas analysis testing laboratory and carry out gas analysis.
The utility model is not only applicable to cluster-type fuel element, and as heavy water reactor, PWR Fuel element, the supercharging being also applicable to the fuel element fission gas of other type is collected.
This technology be successfully applied to presurized water reactor under radioactive environment reclaim uranium be applied to heavy water reactor Irradiated Fuel Rod after fission gas supercharging collect.
To sum up, the beneficial effects of the utility model are:
1, by structural design and selection, guarantee that fission gas collects the security of operation; Adopt the differential pressure measurement technology of original creation both effectively to increase gas collection rate, ensure again the accuracy measured; Set up brand-new fission gas collection process technology, after achieving fuel rod irradiation, effective supercharging of fission gas sample is collected.
2, the utility model Patent design safe supercharging collection technique of fuel rod fission gas, has been used successfully to presurized water reactor and has reclaimed uranium and to test for the Irradiation Test of heavy water reactor fuel element.
2, the utility model patent principle is simple, safely, accurate and efficient, ensure that follow-up fission, not only can be used for military in-service nuclear fuel, also for the test of various New-type fuel element irradiation behaviour, Data support is accurately provided for nuclear reactor improves in the design of security of operation, fuel element, manufacture and performance.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Mark and corresponding parts title in accompanying drawing:
1-U type mercury meter, 2-sampling jar, 3-receiving flask, 4-mercury bottle, 5-surge flask, 6-pipeline A, 7-pipeline B, 8-pipeline C, 9-pipeline D, 10-pipeline E, 11-pipeline F, 12-valve A, 13-valve B, 14-pipeline G, 15-needle-valve.
Embodiment
Below in conjunction with embodiment and accompanying drawing, to the detailed description further of the utility model do, but embodiment of the present utility model is not limited thereto.
Embodiment:
As shown in Figure 1, fuel rod fission gas pressurized collection device, comprise U-shaped mercury meter 1, sampling jar 2, receiving flask 3, mercury bottle 4 and surge flask 5, receiving flask 3 has airtight collecting chamber, mercury bottle 4 has airtight mercury chamber, mercury is loaded with mercury in chamber, receiving flask 3 is connected to pipeline A6, pipeline B7, pipeline C8, pipeline D9, pipeline E10 and pipeline F11, the bottom of collecting chamber connects the openend A of U-shaped mercury meter 1 by pipeline A6, another openend B of U-shaped mercury meter 1 is communicated with air, collecting chamber introduces fission gas by pipeline B7, collecting chamber connects the bottom in mercury chamber by pipeline C8, the top of collecting chamber connects the openend A of U-shaped mercury meter 1 by pipeline D9, collecting chamber connects surge flask 5 by pipeline E10, collecting chamber connects sampling jar 2 by pipeline F11, pipeline E10 also connects the top in mercury chamber by pipeline H, pipeline E10 is provided with valve A12 in the part of collecting chamber, pipeline F11 is provided with valve B13, described surge flask 5 connects air or vacuum extractor by pipeline G14.
The utility model solves on the basis not changing fission gas composition ratio, realizes the collection of micro-fission gas, measurement, transhipment and analytical technology requirement.
Sampling jar 2 is for depositing gaseous sample to be analyzed; Temporarily collecting chamber deposits from system pipeline fission gas out; Mercury chamber is used for depositing mercury, and general volume is greater than collecting chamber; The gaseous tension in sampling jar 2 measured by the U-shaped vacuum meter of single radial cut; When valve B13 is for ensureing to vacuumize at the beginning of collection system and accident condition time mercury safety, prevent other space of the system of entering.
Preferably, one end of pipeline G14 connecting tee pipe, the other two ends of this three-way pipe connect air and vacuum extractor respectively by pipeline, and the pipeline of three-way pipe connection air and vacuum extractor is provided with needle-valve 15, utilize the gas flow of needle-valve 15 pairs of vacuum systems carry out trace and regulate continuously, be configured with the surge flask 5 of large volume, ensure liquid level steadily movement up and down, make collection handling safety controlled, realize micro-flow regulation technology.Metering pin valve 15 and surge flask 5 reduce vacuum system and blowdown gas flow, ensures security and the stationarity of operation.
Preferably, pipeline A6, pipeline B7 and pipeline C8 is connected to the bottom of receiving flask 3, pipeline A6 and pipeline B7 and the connecting portion of receiving flask 3 are the horizontal tube paralleled with receiving flask 3 end, thus the mercury be beneficial in mercury chamber enters receiving flask 3 bottom receiving flask 3, and the mercury entered can sealing pipeline B7 and pipeline C8 as early as possible, pipeline D9, pipeline E10 and pipeline F11 is connected to the top of receiving flask 3, be beneficial to collection or the discharge of gas, one end of the openend A connecting tee pipe of U-shaped mercury meter 1, the other two ends of this three-way pipe are respectively by pipeline connecting pipe road A6 and pipeline D9.
Adopt the U-shaped mercury vacuum gauge of single radial cut, achieve the Measurement accuracy of gas sample pressure after collecting, use needle-valve as variable valve, the useless cavity introduced is less than 0.5ml, and make the collection rate of gaseous sample be greater than 90%, pressure ratio is generally between 6 ~ 100, meanwhile, smooth operation increases gas collection rate.
The stainless steel self sealing structure design of polishing in adopting and tiny flow quantity adjustment structure, after achieving irradiation, the supercharging of fuel rod fission gas is collected, and ensure that security.
A fuel rod fission gas pressurized collection technique, comprise the following steps:
S1, the collecting chamber connected by pipeline F11 and sampling jar 2 to be vacuumized, get rid of the gas that gas in collecting chamber, sampling jar 2 and the pipeline that is communicated with collecting chamber and inwall adsorb;
S2, by fission gas by pipeline B7 introduce collecting chamber, mercury in mercury chamber is injected in collecting chamber by pipeline C8, and collecting chamber and other line seal are isolated by the mercury in collecting chamber, collecting chamber is only made to be communicated with sampling jar 2 and U-shaped mercury meter 1, continue the liquid level promoting mercury in collecting chamber, by the fission gas press-in sampling jar 2 in collecting chamber, the valve B13 then blinded off a line on F;
S3, make the mercury in collecting chamber be back to mercury chamber, mercury liquid level in collecting chamber is declined, until collecting chamber is communicated with pipeline B, the fission gas in pipeline B enters collecting chamber again, again execution step S2;
S4, repetition step S2 ~ S3, obtain the fission gas with certain pressure in sampling jar 2.
The utility model supercharging collection process comprises bleed, sealing type pressure and gas sample pressure and measures three component parts.In collection process technology, bleed is incorporated in collecting chamber by reducing mercury liquid level by vacuum system and flow needle-valve 15 by the fission gas be distributed in system pipeline; Sealing type pressure is by regulating discharging needle-valve 15 to improve mercury liquid level by the gas press-in sampling jar 2 in collecting chamber; Pressure survey is after collection has operated, and adopts the pressure of gas in single radial cut U-shaped measurement amount sampling jar 2.
During practical operation, the burst size of based on fuel element uranium loading amount and burnup estimation fission gas, calculates the pressure limit after collection system release, selects according to pressure limit the U-shaped mercury vacuum gauge of single radial cut meeting range.
Collection system vacuumizes by the utility model before fission gas is introduced from acanthopore chamber, gets rid of gas and the adsorbed gas of part inwall in pipeline, reduces foreign gas to the impact of gas composition analysis; Then fission gas is introduced collection system, regulates the liquid level of mercury cell, make fission gas collecting chamber automatically and other line seal isolate, subsequently fission gas is pressed into sample collection bottle 3; Close sample collection bottle 3, mercury liquid level is declined, and automatically open pipe system and be communicated with fission gas collecting chamber, the fission gas in pipe system enters collecting chamber again, regulates mercury liquid level to raise, carries out collection again.Collected by 3 times, at least can by the fission gas of 90% income sampling jar 2, the pressure of the fission gas in sampling jar 2 depends on the burst size of fission gas and the size of sampling jar 2, pressure ratio is the ratio of system pipeline volume and sampling jar 2 volume 5ml ~ 80ml, and pressure ratio scope is generally between 6 ~ 100; Residual gas in pipeline is sent hot cell housing back to by vacuum system and is entered exhaust system.Take out fission gas sampling jar 2, send into gas analysis testing laboratory and carry out gas analysis.
Preferably, the cavity of introducing is less than 0.5ml, makes the collection rate of gaseous sample be greater than 90%.
The utility model is not only applicable to cluster-type fuel element, and as heavy water reactor, PWR Fuel element, the supercharging being also applicable to the fuel element fission gas of other type is collected.
This technology be successfully applied to presurized water reactor under radioactive environment reclaim uranium be applied to heavy water reactor Irradiated Fuel Rod after fission gas supercharging collect.
As mentioned above, the utility model can be realized preferably.
Claims (4)
1. fuel rod fission gas pressurized collection device, it is characterized in that, comprise U-shaped mercury meter (1), sampling jar (2), receiving flask (3), mercury bottle (4) and surge flask (5), receiving flask (3) has airtight collecting chamber, mercury bottle (4) has airtight mercury chamber, mercury is loaded with mercury in chamber, and receiving flask (3) is connected to pipeline A(6), pipeline B(7), pipeline C(8), pipeline D(9), pipeline E(10) and pipeline F(11)
The bottom of collecting chamber is by pipeline A(6) connect the openend A of U-shaped mercury meter (1), another openend B of U-shaped mercury meter (1) is communicated with air, collecting chamber is by pipeline B(7) introduce fission gas, collecting chamber is by pipeline C(8) connect the bottom in mercury chamber, the top of collecting chamber is by pipeline D(9) connect the openend A of U-shaped mercury meter (1), collecting chamber is by pipeline E(10) connect surge flask (5), collecting chamber is by pipeline F(11) connect sampling jar (2), pipeline E(10) also by the top in pipeline H connection mercury chamber, pipeline E(10) in the part of collecting chamber, be provided with valve A(12), pipeline F(11) on be provided with valve B(13),
Described surge flask (5) is by pipeline G(14) connect air or vacuum extractor.
2. fuel rod fission gas pressurized collection device according to claim 1, it is characterized in that, described pipeline G(14) one end of connecting tee pipe, the other two ends of this three-way pipe connect air and vacuum extractor respectively by pipeline, and the pipeline of three-way pipe connection air and vacuum extractor is provided with needle-valve (15).
3. fuel rod fission gas pressurized collection device according to claim 1, it is characterized in that, described pipeline A(6), pipeline B(7) and pipeline C(8) be connected to the bottom of receiving flask (3), pipeline A(6) and pipeline B(7) be the horizontal tube paralleled with receiving flask (3) end with the connecting portion of receiving flask (3), pipeline D(9), pipeline E(10) and pipeline F(11) be connected to the top of receiving flask (3).
4. fuel rod fission gas pressurized collection device according to claim 1, it is characterized in that, one end of the openend A connecting tee pipe of described U-shaped mercury meter (1), the other two ends of this three-way pipe are respectively by pipeline connecting pipe road A(6) and pipeline D(9).
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| CN201520875393.0U CN205067171U (en) | 2015-11-05 | 2015-11-05 | Fuel rod fission gas pressurization collection device |
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| CN201520875393.0U CN205067171U (en) | 2015-11-05 | 2015-11-05 | Fuel rod fission gas pressurization collection device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174295A (en) * | 2019-07-02 | 2019-08-27 | 中国科学院寒区旱区环境与工程研究所 | Sample dissociation device and gas collector |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174295A (en) * | 2019-07-02 | 2019-08-27 | 中国科学院寒区旱区环境与工程研究所 | Sample dissociation device and gas collector |
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