CN109599196A - Fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure - Google Patents
Fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure Download PDFInfo
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- CN109599196A CN109599196A CN201811567136.5A CN201811567136A CN109599196A CN 109599196 A CN109599196 A CN 109599196A CN 201811567136 A CN201811567136 A CN 201811567136A CN 109599196 A CN109599196 A CN 109599196A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/02—Devices or arrangements for monitoring coolant or moderator
- G21C17/04—Detecting burst slugs
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/002—Detection of leaks
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/06—Devices or arrangements for monitoring or testing fuel or fuel elements outside the reactor core, e.g. for burn-up, for contamination
- G21C17/07—Leak testing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
Fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure, the device include water inlet pipe, lower seal lid, hermetically sealed can, take out pressure chamber, outlet pipe, fixed device, fuel rod fixed ring, elevating control platform, junction chamber, fuel rod, seal head and take out pressure pipe；Wherein water inlet pipe is connected with lower seal lid；Lower seal lid is connected with hermetically sealed can；Fuel rod is placed in hermetically sealed can, is fixed using fuel rod fixed ring；Outlet pipe is connected with hermetically sealed can；Two fixed devices are for fixing entire hermetically sealed can；Hermetically sealed can is connected with pressure chamber is taken out；Pressure chamber is taken out to be connected with elevating control platform by junction chamber；Elevating control platform controls seal head and is taking out pressure indoor lifting；The simple easy processing of above-mentioned apparatus overall structure provides measurement scheme for fission gas leakage characteristics research after fuel element failure；The present invention also provides the test methods of the measurement experiment device.
Description
Technical field
The invention belongs to micro- cut gas leakage technology fields, and in particular to fission gas is let out after a kind of fuel element failure
Test leakage amount experimental provision and method.
Technical background
Under high temperature and strong radiation parameter there is damaged risk in fuel element cladding, therefore during reactor cold-refueling,
Damaged leak test can be carried out to nuclear fuel assembly using sipping test and work as cut to obtain the cut size of fuel element
When oversized, then the fuel element is replaced.Sipping test is fuel assembly to be isolated in a defined container, leans on fuel
The decay heat of itself is heated with heater, escapes soluble fission product or fission gas, is then extracted sample and is used in combination
Radiation detecting instrument analysis sobs to inhale device and be broadly divided into sob online and inhales device and sob suction device offline.Suction device is sobbed online to be configured at
On reactor building fuel manipulator crane, the semiclosed environment formed when being lifted into fuel manipulator crane sleeve using fuel assembly is extracted
Water sample therein or gas sample determine the integrality of fuel rod clad by analysis fission gas radionuclide level.Offline
It sobs suction device to be mainly made of the gentle circuit of water loop, online gamma ray spectrometer is housed on air circuit, for continuously detecting133Xe's
Activity starts the water in electrical-heating source heating circuit after fuel assembly, which is put into, sobs suction-chamber immediately.Temperature rises to defined temperature
Heater is closed after degree platform, opens condenser, suction-chamber is sobbed by the collective effect maintenance of the waste heat and condenser of fuel assembly
The stabilization of interior temperature, gas or liquid in fuel rod are discharged into from cut and sob suction-chamber, and wherein fission gas is with air circuit
Compressed air one play the upper gas space for sobbing suction-chamber and recycled into gas return path, gas is measured by gamma ray spectrometer
Radioactivity, be released kinetic curve, that is, activity curve.Cut equivalent size judgement need according to transmission fluid,
Heating rate and platform temperature find corresponding theoretical curve, to obtain the range of break size equivalent diameter.But this base
In the mode that heating mode promotes fission gas to discharge, there are shortcoming and defect, and the time of measuring of which is longer, and needs
Air circuit and water loop, device are complex.
Summary of the invention
In order to overcome the above-mentioned problems of the prior art, the purpose of the present invention is to provide after a kind of fuel element failure
Fission gas leakage measuring instrumentation experimental provision and method, the device promote fission gas release using pressure difference, can rationally measure and split
Become the amount of the substance of gas leakage, and then the quantitative analysis for failed fuel element break size provides support.
In order to achieve the above object, the present invention adopts the following technical scheme:
Fission gas leakage measuring instrumentation experimental provision after a kind of fuel element failure, the experimental provision are based on small broken
Gas diffusion principle, the water inlet pipe (1) for being used for water flowing including being located at entire experimental provision lower position；With water inlet pipe (1) phase
The lower seal lid (2) of connection；The hermetically sealed can (3) being connected with lower seal lid；The pumping pressure chamber being connected with hermetically sealed can (3)
(8)；Outlet pipe (7) is connected with hermetically sealed can (3)；Fixed device is for fixing entire hermetically sealed can (3)；It is used in hermetically sealed can (3)
Fuel rod fixed ring (12) fixed fuel stick (4), move up and down fuel rod (4) will not；Take out pressure chamber (8) and elevating control platform
(11) it is connected by junction chamber (10)；Elevating control platform (11) controls seal head (9) and is taking out lifting in pressure chamber (8)；Take out pressure pipe
(13) it is connected with pumping pressure chamber (8)；It takes out and is disposed with pressure sensor and temperature sensor in pressure chamber (8) for measuring pressure and temperature
Degree；It takes out and is disposed with pressure sensor in pressure pipe (13) for measuring pressure.
Fission gas leakage measuring instrumentation experimental provision after a kind of fuel element failure is controlled using elevating control platform (11)
Seal head (9) processed is taking out lifting in pressure chamber (8), for when extracting pressure, seal head (9) to minimize place and hermetically sealed can
(3) it is in close contact, is influenced when excluding to take out pressure on caused by fission gas leakage；When standing, seal head (9) rises to pumping pressure
The highest point of room (8) promotes fission gas leakage by pressure difference.
The fixed device includes first fixed device (5) being arranged on hermetically sealed can (3) tank body and the second fixed device
(6)。
The test method of fission gas leakage measuring instrumentation experimental provision after the fuel element failure, to fuel element failure
Afterwards when fission gas leakage measuring instrumentation, seal head (9) is minimized into place by elevating control platform (11) first and hermetically sealed can (3) are tight
Contiguity touching, influence when excluding to take out pressure to fission gas release,；It opens lower seal lid (2), by the fuel rod after doubtful breakage
(4) it is put into hermetically sealed can (3), closes lower seal lid (2)；The valve in water inlet pipe (1) is opened, the valve of outlet pipe (7) is opened
Door, is passed through water from water inlet pipe (1), after internal air is discharged, closes the valve of outlet pipe (7), closes water inlet pipe (1)
In valve, water is full of in hermetically sealed can (3) at this time；Open take out pressure pipe (13) in valve, by with smoke what pressure pipe (13) was connected
Vacuum pump extracts the air in pressure chamber (8), and the fission gas for the fuel rod (4) that manufacture pressure difference promotes discharges from cut,
When taking out the pressure sensor numerical value preset pressure of arrival in pressure pipe (13), the valve for taking out pressure pipe (13) is closed, record, which is taken out, presses
The numerical value P of pressure sensor in room (8)1, the numerical value T of temperature sensor1；Seal head (9) are risen by elevating control platform (11)
To the highest point for taking out pressure chamber (8)；It stands a period of time and does not change until taking out pressure sensor numerical value in pressure chamber (8), record
Take out the numerical value P of pressure sensor in pressure chamber (8)2, the numerical value T of temperature sensor2.Known pressure value P1, P2, temperature value T1, T2, and
The volume V for taking out pressure chamber (8), according to The Ideal-Gas Equation P1V=n1RT1, P2V=n2RT2, in which: R is that perfect gas is normal
Number, is worth for 8.314J/Kmol, n1To stand the preceding amount for taking out gaseous matter in pressure chamber, n2To take out gaseous matter in pressure chamber after standing
Amount, can find out stand during leak fission gas substance amount n3=n2-n1, it is small cut gas diffusion mechanism
Quantitative analysis with failed fuel element break size provides support.
Compared to the prior art compared with the present invention has following advantage:
1, fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure of the present invention only detect
The radioactivity of gas, overall structure is simple, is easily worked, easy to operate.
2, fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure of the present invention extract pressure
When power, pressure chamber will be taken out using seal head and separated with hermetically sealed can, when eliminating extraction pressure, pressure change makes fission gas release
At influence.
3, fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure of the present invention, using pumping
The mode of pressure power promotes fission gas to discharge, and can control the pressure size extracted, to control the length of time of repose, realizes
The function of quickly detecting.
4, fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure of the present invention, using pumping
The mode of pressure power promotes fission gas to discharge, by the pressure change of measurement, temperature change and the volume for taking out pressure chamber, and Ke Yiji
The amount of the substance of fission gas is calculated, the quantitative analysis for failed fuel element break size provides support.
Detailed description of the invention
Fig. 1 is fission gas leakage measuring instrumentation experimental provision overall structure diagram after a kind of fuel element failure of the present invention.
Fig. 2 is fission gas leakage measuring instrumentation experimental provision superstructure schematic diagram after a kind of fuel element failure of the present invention.
Fig. 3 is fission gas leakage measuring instrumentation experimental provision central structure schematic diagram after a kind of fuel element failure of the present invention.
Fig. 4 is fission gas leakage measuring instrumentation experimental provision bottom substance schematic diagram after a kind of fuel element failure of the present invention.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description:
Shown in as shown in Figure 1, Figure 3 and Figure 4, fission gas leakage measuring instrumentation is tested after a kind of fuel element failure of the present invention
Device, the water inlet pipe 1 for being used for water flowing including being located at entire experimental provision lower position；The lower seal being connected with water inlet pipe 1
Lid 2；The hermetically sealed can 3 being connected with lower seal lid；The pumping pressure chamber 8 being connected with hermetically sealed can 3；Outlet pipe 7 is connected with hermetically sealed can 3
It connects；First fixed device 5 and the second fixed device 6 are for fixing entire hermetically sealed can 3；Fuel rod fixed ring is used in hermetically sealed can 3
12 fixed fuel sticks 4, move up and down fuel rod 4 will not；It takes out pressure chamber 8 and is connected with elevating control platform 11 by junction chamber 10；It rises
Drop console 11 controls seal head 9 and goes up and down in pumping pressure chamber 8；It takes out pressure pipe 13 and is connected with pressure chamber 8 is taken out；It takes out in pressure chamber 8 and is disposed with pressure
Force snesor and temperature sensor are for measuring pressure and temperature；Take out pressure pipe 13 in be disposed with pressure sensor for measure pressure
Power.
As shown in Fig. 2, after a kind of fuel element failure fission gas leakage measuring instrumentation experimental provision test method,
It is gone up and down in pumping pressure chamber 8 using the control seal head 9 of elevating control platform 11, for when extracting pressure, seal head 9 to be down to most
Lower and hermetically sealed can 3 are in close contact, and are influenced when excluding to take out pressure on caused by fission gas leakage；When standing, seal head 9
The highest point for taking out pressure chamber 8 is risen to, fission gas leakage is promoted by pressure difference.
The test method of fission gas leakage measuring instrumentation experimental provision after a kind of fuel element failure of the present invention, to combustion
After material element rupture when fission gas leakage measuring instrumentation, seal head 9 is minimized by place and sealing by elevating control platform 11 first
Tank 3 is in close contact, influence when excluding to take out pressure to fission gas release；Lower seal lid 2 is opened, by the fuel after doubtful breakage
Stick 4 is put into hermetically sealed can 3, closes lower seal lid 2；The valve in water inlet pipe 1 is opened, the valve of outlet pipe 7 is opened, from water inlet
It is passed through water in pipe 1, after internal air is discharged, closes the valve of outlet pipe 7, closes the valve in water inlet pipe 1, it is close at this time
Water is full of in sealed cans 3；Open the valve taken out in pressure pipe 13, by with take out the vacuum pump that is connected of pressure pipe 13 and smoke in pressure chamber 8
The fission gas of air, the fuel rod 4 that manufacture pressure difference promotes discharges from cut, the pressure sensor number in pumping pressure pipe 13
When value reaches specified pressure, the valve for taking out pressure pipe 13 is closed, record takes out the numerical value P of pressure sensor in pressure chamber 81, temperature biography
The numerical value T of sensor1；Seal head 9 is raised up to the highest point for taking out pressure chamber 8 by elevating control platform 11；Stand a period of time until
It takes out pressure sensor numerical value in pressure chamber 8 not change, record takes out the numerical value P of pressure sensor in pressure chamber 82, temperature sensor
Numerical value T2.Known pressure value P1, P2, temperature value T1, T2, and the volume V of pressure chamber 8 is taken out, according to The Ideal-Gas Equation P1V=
n1RT1, P2V=n2RT2, in which: R is ideal gas constant, is worth for 8.314J/Kmol, n1Indoor gas is pressed to stand preceding take out
The amount of substance, n2For the amount for taking out gaseous matter in pressure chamber after standing, the fission gas substance leaked during standing can be found out
Amount n3=n2-n1, the quantitative analysis for small cut gas diffusion mechanism and failed fuel element break size provides support.
The above content is only used to illustrate the present invention, and it cannot be said that a specific embodiment of the invention is only limitted to this, for this
For those of ordinary skill in technical field, as long as within spirit of the invention, to embodiment described above
Variation and modification all should be considered as within the scope of claims of the present invention.
Claims (4)
1. fission gas leakage measuring instrumentation experimental provision after a kind of fuel element failure, it is characterised in that: the experimental provision is
Based on small cut gas diffusion principle, including being located at water inlet pipe (1) of the entire experimental provision lower position for water flowing；With into
The lower seal lid (2) that water pipe (1) is connected；The hermetically sealed can (3) being connected with lower seal lid；It is connected with hermetically sealed can (3)
Pumping pressure chamber (8)；Outlet pipe (7) is connected with hermetically sealed can (3)；Fixed device is for fixing entire hermetically sealed can (3)；Hermetically sealed can
(3) fuel rod fixed ring (12) fixed fuel stick (4) is used in, move up and down fuel rod (4) will not；It takes out pressure chamber (8) and rises
Console (11) are dropped to be connected by junction chamber (10)；Elevating control platform (11) controls seal head (9) and is taking out lifting in pressure chamber (8)；
It takes out pressure pipe (13) and is connected with pressure chamber (8) are taken out；It takes out and is disposed with pressure sensor and temperature sensor in pressure chamber (8) for measuring pressure
And temperature；It takes out and is disposed with pressure sensor in pressure pipe (13) for measuring pressure.
2. fission gas leakage measuring instrumentation experimental provision, feature exist after a kind of fuel element failure according to claim 1
In: seal head (9) are controlled using elevating control platform (11) and are taking out lifting in pressure chamber (8), for sealing when extracting pressure
Head (9) minimizes place and hermetically sealed can (3) are in close contact, and influences when excluding to take out pressure on caused by fission gas leakage；It is standing
When, seal head (9) rises to the highest point for taking out pressure chamber (8), promotes fission gas leakage by pressure difference.
3. fission gas leakage measuring instrumentation experimental provision, feature exist after a kind of fuel element failure according to claim 1
In: the fixed device includes first fixed device (5) and second fixed device (6) being arranged on hermetically sealed can (3) tank body.
4. the test method of fission gas leakage measuring instrumentation experimental provision, feature after fuel element failure described in claim 1
It is: is down to seal head (9) to elevating control platform (11) when fission gas leakage measuring instrumentation, are passed through after fuel element failure first
Lowest part and hermetically sealed can (3) are in close contact, influence when excluding to take out pressure to fission gas release,；It opens lower seal lid (2),
Fuel rod (4) after doubtful breakage is put into hermetically sealed can (3), is closed lower seal lid (2)；Open the valve in water inlet pipe (1)
Door opens the valve of outlet pipe (7), is passed through water from water inlet pipe (1), after internal air is discharged, closes outlet pipe (7)
Valve, close the valve in water inlet pipe (1), be full of water in hermetically sealed can (3) at this time；The valve taken out in pressure pipe (13) is opened, is led to
It crosses and takes out the air in vacuum pump extraction pumping pressure chamber (8) that pressure pipe (13) are connected, fuel rod (4) that manufacture pressure difference promotes are split
Become gas to discharge from cut, when taking out the pressure sensor numerical value preset pressure of arrival in pressure pipe (13), closes and take out pressure pipe
(13) valve, record take out the numerical value P of pressure sensor in pressure chamber (8)1, the numerical value T of temperature sensor1；Pass through elevating control platform
(11) seal head (9) is raised up to the highest point for taking out pressure chamber (8)；A period of time is stood until taking out pressure sensor in pressure chamber (8)
Numerical value does not change, and record takes out the numerical value P of pressure sensor in pressure chamber (8)2, the numerical value T of temperature sensor2；Known pressure value
P1, P2, temperature value T1, T2, and the volume V of pressure chamber (8) is taken out, according to The Ideal-Gas Equation P1V=n1RT1, P2V=n2RT2,
Wherein: R is ideal gas constant, is worth for 8.314J/Kmol, n1To stand the preceding amount for taking out gaseous matter in pressure chamber, n2To stand
The amount for taking out gaseous matter in pressure chamber afterwards, can find out the amount n of the fission gas substance leaked during standing3=n2-n1, it is micro-
The quantitative analysis of minor break gas diffusion mechanism and failed fuel element break size provides support.
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| CN201811567136.5A CN109599196B (en) | 2018-12-19 | 2018-12-19 | Fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure |
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| CN109599196B CN109599196B (en) | 2019-08-09 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111145923A (en) * | 2019-11-26 | 2020-05-12 | 中广核工程有限公司 | Method for detecting damage of spent fuel assembly of nuclear power station |
| CN111175450A (en) * | 2020-01-10 | 2020-05-19 | 中铁十四局集团大盾构工程有限公司 | Real-time detection device for harmful gas in excavation bin of large-diameter slurry shield machine |
| CN111524620A (en) * | 2020-04-25 | 2020-08-11 | 西安交通大学 | Device and method for simulating tiny gas diffusion and collection at break opening in off-line sipping of fuel assembly |
| RU2740295C1 (en) * | 2019-04-29 | 2021-01-13 | Цзянсуская корпорация по ядерной энергетике | System for controlling concentration of radioactive iodine of a first reactor circuit and method for operation thereof |
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| CN111175450A (en) * | 2020-01-10 | 2020-05-19 | 中铁十四局集团大盾构工程有限公司 | Real-time detection device for harmful gas in excavation bin of large-diameter slurry shield machine |
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| CN111524620B (en) * | 2020-04-25 | 2021-10-19 | 西安交通大学 | Device and method for simulating tiny gas diffusion and collection at break opening in off-line sipping of fuel assembly |
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|---|---|
| CN109599196B (en) | 2019-08-09 |
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