CN111524620B - Device and method for simulating tiny gas diffusion and collection at break opening in off-line sipping of fuel assembly - Google Patents
Device and method for simulating tiny gas diffusion and collection at break opening in off-line sipping of fuel assembly Download PDFInfo
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- CN111524620B CN111524620B CN202010336073.3A CN202010336073A CN111524620B CN 111524620 B CN111524620 B CN 111524620B CN 202010336073 A CN202010336073 A CN 202010336073A CN 111524620 B CN111524620 B CN 111524620B
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- 239000000446 fuel Substances 0.000 title claims abstract description 43
- 238000009792 diffusion process Methods 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 14
- 239000000700 radioactive tracer Substances 0.000 claims abstract description 6
- 230000008859 change Effects 0.000 claims abstract description 4
- 239000008188 pellet Substances 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims description 54
- 230000004992 fission Effects 0.000 claims description 11
- 239000012159 carrier gas Substances 0.000 claims description 9
- 238000007789 sealing Methods 0.000 claims description 6
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000004088 simulation Methods 0.000 abstract description 7
- 238000005259 measurement Methods 0.000 description 9
- 238000013461 design Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005253 cladding Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/001—Mechanical simulators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01T—MEASUREMENT OF NUCLEAR OR X-RADIATION
- G01T7/00—Details of radiation-measuring instruments
- G01T7/02—Collecting means for receiving or storing samples to be investigated and possibly directly transporting the samples to the measuring arrangement; particularly for investigating radioactive fluids
-
- 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
- G21C17/042—Devices for selective sampling, e.g. valves, shutters, rotatable selector valves
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Molecular Biology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Analytical Chemistry (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
A simulation fuel assembly sips the device that the tiny gas diffusion of the cut collects in the suction off line, the device includes an inner cylinder to simulate fuel element, an outer cylinder to simulate water circuit, there is a rod core including simulating fuel element pellet in the inner cylinder, there is tracer gas in the inner cylinder, the outer cylinder contains water and inner cylinder, and the outer cylinder can control the temperature and pressure of the water bath environment; the inner barrel and the outer barrel are provided with the crevasse opening and closing device, so that the pressurized locking of the crevasse, the crevasse opening and the size change of the crevasse can be realized, and the simulation of the offline sipping process of the fuel elements with different damage degrees can be realized.
Description
Technical Field
The invention relates to the field of sipping during reactor shutdown and refueling, in particular to a device and a method for simulating tiny gas diffusion collection at a crevasse in off-line sipping of a fuel assembly.
Background
High temperature and high radiation conditions in nuclear reactors can cause the fuel element cladding to be damaged, and therefore sipping tests are used to perform damage leakage inspection on nuclear fuel assemblies during reactor shutdown and refueling. The sipping test involves isolating the fuel assembly in a defined container, heating the fuel assembly by its own decay heat or by a heater to allow soluble fission products or fission gases to escape, and then taking the sample and analyzing it with a radiation detector.
According to the current reactor operation experience, the sipping devices of the fuel assembly are mainly divided into two types: an online sipping device and an offline sipping device. The on-line sipping device is arranged on a loading and unloading machine of a reactor factory, a semi-closed environment formed when a fuel assembly is lifted to enter an inner barrel of the loading and unloading machine is utilized, compressed air is injected from the bottom of the inner barrel through an air blowing pipe, airflow carries fission gas leaked from a fuel rod to rise to the water surface in the inner barrel, then a water sample or a gas sample in the air flow is extracted, and the integrity of a cladding of the fuel rod is determined by analyzing the level of the fission gas radionuclide. The on-line sipping device has higher environmental requirements for realizing sipping, namely the sipping is completed in the unloading process, and the power for promoting the fission gas 133Xe to be released from the damaged port of the fuel rod is only the height change of the fuel assembly in the reactor core and the refueling water pool, so that the pressure difference inside and outside the rod of the fission gas in the fuel rod is increased.
The off-line sipping device mainly comprises a water loop and an air loop, wherein an on-line gamma spectrometer is arranged on the air loop and is used for continuously detecting the activity of 133 Xe. When the fuel assembly is placed in the sipping chamber, the electric heating source is immediately started to heat water in the loop, when the temperature rises to a specified temperature platform, the heater is closed, the condenser is started, and the stability of the temperature in the sipping chamber is maintained through the combined action of the waste heat of the fuel assembly and the condenser. At this time, the gas or liquid in the fuel rod is released from the breach to the sipping chamber, wherein the fission gas flows to the upper gas space of the sipping chamber along with the compressed air of the gas loop, and thereafter the gas is collected for radioactive measurement. The sipping process of the off-line sipping device has longer time, more stable measuring environment and higher measuring precision.
Disclosure of Invention
The invention aims to design a device for simulating the collection and measurement of micro gas diffusion at the opening of a component in the off-line sipping of a fuel component.
In order to achieve the purpose, the invention adopts the following technical scheme:
a device for simulating micro gas diffusion collection at a breach in off-line sipping of a fuel assembly comprises a rod core 101, an inner barrel 102 and an outer barrel 105, wherein the rod core 101 is used for simulating fuel element pellets, the rod core 101 is placed in the inner barrel 102, and the inner barrel 102 is used for simulating a gas space containing fission gas in a fuel element; a crevasse opening and closing device 103 is arranged on the side surface of the inner cylinder 102 and is used for simulating crevasses of fuel elements; the bottom of the inner cylinder 102 is connected with a gas supply system so as to inject mixed gas mixed with tracer gas into the inner cylinder 102; the inner barrel 102 is arranged in the outer barrel 105, the outer barrel 105 is used for simulating a water loop in an off-line sipping process, water bath environments with different temperatures are provided for the inner barrel, and meanwhile, the top of the outer barrel 105 contains a part of air space; a thermocouple 124 and a pressure gauge 125 are arranged inside the outer cylinder 105, and are respectively used for monitoring the temperature and the pressure of the outer cylinder 105; the gas space above the top cover of the outer cylinder 105 is connected with a top ball valve 111, the bottom is connected with a bottom ball valve 119, and the top ball valve 111 and the bottom ball valve 119 are used for connecting the outer cylinder 105 with a circulating carrier gas loop to form circulating carrier gas of the gas loop.
The crevasse opening and closing device 103 is positioned between the inner cylinder 102 and the outer cylinder 105 and comprises a replaceable crevasse gasket 201, a sealing ring 202, a flexible plug 203, a rotating shaft 204, a locking thread 205 and a crevasse opening and closing operating lever 206; the locking thread 205 is arranged at an opening on the side wall of the outer barrel 105; the tail part of the rotating shaft 204 is inserted into the opening of the side wall of the outer cylinder 105, and when the crevasse opening and closing device 103 is closed, the flexible plug 203 at the head part of the rotating shaft 204 seals the opening of the side wall of the inner cylinder 102 through the replaceable crevasse gasket 201 and the sealing ring 202; the working mode is that the flexible plug 203 at the head of the rotating shaft is driven to compress to realize the under-pressure locking of the crevasses by rotating the crevasse opening and closing operating rod 206 to screw into the locking thread 205, the crevasses are opened by reverse operation, and meanwhile, the crevasse size can be changed by replacing the crevasse gasket 201.
When the device for simulating the collection of the micro gas diffusion at the break port in the off-line sipping of the fuel assembly simulates the measurement of the micro gas diffusion in the off-line sipping process, firstly, the rod core 101 is placed into the inner barrel 102, the inner barrel 102 is placed into the outer barrel 105, then, the break port opening and closing device 103 is closed, and the outer barrel 105 is sealed; heating the water in the outer cylinder 105 to a required temperature T, and then filling a group of preheated mixed gas containing tracer gas into the inner cylinder 102; slowly opening the top ball valve 111, observing the pressure gauge 125 on the outer cylinder 105, and quickly closing the top ball valve 111 when the reading reaches a set pressure value P1; by operating the crevasse opening and closing lever 206, the rotating shaft 204 is rotated to open the crevasse opening and closing device 103, and the outer cylinder 105 is allowed to sufficiently stand in an environment with a pressure of P1; the top ball valve 111 and the bottom ball valve 119 are opened to circulate the carrier gas, and when the pressure reaches the set pressure value P2, the measurement is performed.
Compared with the prior art, the invention has the following advantages:
1. the experimental device for simulating the collection of the micro gas diffusion in the off-line sipping process has a simple structure, can accurately simulate the diffusion and the collection of the off-line sipping under the real condition, and can realize the simulation of more fuel element states and the off-line sipping environment by changing the experimental temperature environment, the pressure environment, the gas ratio and the size of a break port; the whole experimental device has small design scale, high reduction degree in the process of collecting the experimental simulation offline sipping gas, simple and easy operation, and higher safety and economical efficiency.
2. The crevasse opening and closing device provided by the invention realizes opening and closing of the crevasse by external control through the design of the external connecting rod, and simulates diffusion and collection of fission gas in the process of real offline sipping of the fuel rod. The sealing performance of the inner cylinder for simulating the fuel element during inflation and deflation is guaranteed, meanwhile, the replaceable crevasse gasket is adopted, and simulation and measurement work of different crevasse sizes of the fuel element is realized by changing the simulated crevasse size.
In a word, the experimental device for simulating the collection of the micro gas diffusion in the off-line sipping process has the advantages of accurate simulation reduction, stable measurement environment and various measurement working conditions, and can well realize the simulation of the off-line sipping process.
Drawings
FIG. 1 is a schematic diagram of an apparatus for simulating micro gas diffusion collection at a break in an off-line sipping of a fuel assembly according to the present invention.
FIG. 2 is a view of the crevasse opening and closing device of the present invention.
Detailed Description
The invention is described in detail below with reference to the following figures and detailed description:
as shown in fig. 1, the device for simulating micro gas diffusion collection at a breach in off-line sipping of a fuel assembly of the present invention includes a rod core 101, an inner barrel 102 and an outer barrel 105, wherein the rod core 101 is used for simulating fuel element pellets, the rod core 101 is placed in the inner barrel 102, and the inner barrel 102 is used for simulating a gas space containing fission gas inside a fuel element; a crevasse opening and closing device 103 is arranged on the side surface of the inner cylinder 102 and is used for simulating crevasses of fuel elements; the bottom of the inner cylinder 102 is connected with a multipurpose gas system; an outer cylinder 105 of the simulated water circuit, wherein the inner cylinder 102 of the simulated fuel element is placed in the outer cylinder 105, the outer cylinder 105 is used for simulating the water circuit in the off-line sipping process, water bath environments with different temperatures are provided for the inner cylinder 102, and meanwhile, the top of the outer cylinder 105 contains a part of air space; a thermocouple 124 and a pressure gauge 125 are arranged inside the outer cylinder 105, and are respectively used for monitoring the temperature and the pressure of the outer cylinder 105; the gas space above the top cover of the outer drum 105 is connected to a top ball valve 111 and the bottom is connected to a bottom ball valve 119, the top ball valve 111 and the bottom ball valve 119 being used to connect the outer drum 105 to a circulating carrier gas circuit.
As shown in fig. 2, the crevasse opening and closing device is located between the inner cylinder 102 and the outer cylinder 105, and includes a replaceable crevasse gasket 201, a sealing ring 202, a flexible plug 203, a rotating shaft 204, a locking thread 205 and a crevasse opening and closing operating lever 206, and the working mode is that the flexible plug 203 at the head of the rotating shaft is driven to compress to realize the pressurized locking of the crevasse by rotating the crevasse opening and closing operating lever 206 to screw into the locking thread 205, and the crevasse opening and closing device is reversely operated to realize the crevasse opening, and meanwhile, the replaceable crevasse gasket 201 realizes the change of the size of the crevasse.
When the device for simulating the collection of the micro gas diffusion at the break port in the off-line sipping of the fuel assembly simulates the measurement of the micro gas diffusion in the off-line sipping process, firstly, the rod core 101 is placed into the inner barrel 102, the inner barrel 102 is placed into the outer barrel 105, then, the break port opening and closing device 103 is closed, and the outer barrel 105 is sealed; heating the water in the outer cylinder 105 to a required temperature T, and then filling a group of preheated mixed gas containing tracer gas into the inner cylinder 102; slowly opening the ball valve 111, observing the pressure gauge 125 on the outer cylinder 105, and quickly closing the top ball valve 111 when the reading reaches a set pressure value P1; by operating the crevasse opening and closing lever 206, the rotating shaft 204 is rotated to open the crevasse opening and closing device 103, and the outer cylinder 105 is allowed to sufficiently stand in an environment with a pressure of P1; the top ball valve 111 and the bottom ball valve 119 are opened to circulate the carrier gas, and when the pressure reaches the set pressure value P2, the measurement is performed.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
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|---|---|---|---|
| CN202010336073.3A CN111524620B (en) | 2020-04-25 | 2020-04-25 | Device and method for simulating tiny gas diffusion and collection at break opening in off-line sipping of fuel assembly |
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| CN202010336073.3A CN111524620B (en) | 2020-04-25 | 2020-04-25 | Device and method for simulating tiny gas diffusion and collection at break opening in off-line sipping of fuel assembly |
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| CN111524620A CN111524620A (en) | 2020-08-11 |
| CN111524620B true CN111524620B (en) | 2021-10-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112002450B (en) * | 2020-08-24 | 2024-10-18 | 中核武汉核电运行技术股份有限公司 | Fuel assembly fixing and isolating device |
| CN112037950B (en) * | 2020-09-24 | 2022-02-11 | 中国核动力研究设计院 | Fuel rod fission product release simulation device and use method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109072A (en) * | 1985-12-20 | 1987-06-24 | 法玛汤姆和柯吉玛股份有限公司 | The method and apparatus that cladding defect detects in the nuclear fuel assembly |
| EP1810297A1 (en) * | 2004-11-11 | 2007-07-25 | AREVA NP GmbH | Method for testing the impermiability of fuel elements of a water boiling reactor fuel rods |
| CN103680647A (en) * | 2013-11-22 | 2014-03-26 | 国核电站运行服务技术有限公司 | Fuel sipping inspection environmental simulation device |
| CN109599196A (en) * | 2018-12-19 | 2019-04-09 | 西安交通大学 | Fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3062946B1 (en) * | 2017-02-15 | 2021-07-23 | Areva Np | DEVICE AND PROCEDURE FOR TIGHTNESS CONTROL BY WIPING A NUCLEAR FUEL ASSEMBLY |
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- 2020-04-25 CN CN202010336073.3A patent/CN111524620B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN85109072A (en) * | 1985-12-20 | 1987-06-24 | 法玛汤姆和柯吉玛股份有限公司 | The method and apparatus that cladding defect detects in the nuclear fuel assembly |
| EP1810297A1 (en) * | 2004-11-11 | 2007-07-25 | AREVA NP GmbH | Method for testing the impermiability of fuel elements of a water boiling reactor fuel rods |
| CN103680647A (en) * | 2013-11-22 | 2014-03-26 | 国核电站运行服务技术有限公司 | Fuel sipping inspection environmental simulation device |
| CN109599196A (en) * | 2018-12-19 | 2019-04-09 | 西安交通大学 | Fission gas leakage measuring instrumentation experimental provision and method after a kind of fuel element failure |
Non-Patent Citations (1)
| Title |
|---|
| 核电站在线啜吸试验装置结构设计;简明;《机械工程师》;20171231;全文 * |
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