CN111477368A - Annular fuel cladding test piece capable of heating inside and outside simultaneously - Google Patents
Annular fuel cladding test piece capable of heating inside and outside simultaneously Download PDFInfo
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- CN111477368A CN111477368A CN202010448582.5A CN202010448582A CN111477368A CN 111477368 A CN111477368 A CN 111477368A CN 202010448582 A CN202010448582 A CN 202010448582A CN 111477368 A CN111477368 A CN 111477368A
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- 238000005253 cladding Methods 0.000 title claims abstract description 131
- 238000012360 testing method Methods 0.000 title claims abstract description 69
- 239000000446 fuel Substances 0.000 title claims abstract description 62
- 238000010438 heat treatment Methods 0.000 title claims abstract description 21
- 238000005485 electric heating Methods 0.000 claims description 45
- 239000007789 gas Substances 0.000 claims description 37
- 238000003466 welding Methods 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000306 component Substances 0.000 claims description 10
- 239000008358 core component Substances 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 6
- 229910045601 alloy Inorganic materials 0.000 claims description 4
- 239000000956 alloy Substances 0.000 claims description 4
- OJIJEKBXJYRIBZ-UHFFFAOYSA-N cadmium nickel Chemical compound [Ni].[Cd] OJIJEKBXJYRIBZ-UHFFFAOYSA-N 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000011148 porous material Substances 0.000 claims description 3
- 239000003758 nuclear fuel Substances 0.000 abstract description 7
- 238000013461 design Methods 0.000 description 5
- 238000011161 development Methods 0.000 description 5
- 239000008188 pellet Substances 0.000 description 5
- 238000011160 research Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000012010 growth Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000004992 fission Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
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- 230000008961 swelling Effects 0.000 description 1
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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
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
- G21C17/001—Mechanical simulators
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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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- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of nuclear fuel assembly test devices, and particularly relates to an annular fuel cladding test piece capable of heating inside and outside simultaneously. Through the arrangement of the structure and the connection of all the components, the requirement of the inner pressure bearing of the inner cladding of the annular fuel rod during various tests can be met; and the volume of the air cavity is adjustable, so that various test environments can be better simulated.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel assembly test devices, and particularly relates to an annular fuel cladding test piece capable of being heated inside and outside simultaneously.
Background
During the operation of a nuclear power plant reactor, the performance of nuclear fuel is an important factor affecting the safety and economy of the reactor. Therefore, the research on fuel elements is put on a very prominent position internationally, and various performances of the nuclear fuel elements are continuously improved by optimizing the design of the fuel elements, adopting advanced structural materials, improving element manufacturing processes and other methods, so that nuclear power is promoted to develop towards a safer and more economic direction.
The completeness and the economy are the basis of nuclear power development, and almost all nuclear power technology development aims at improving the safety and the economy of nuclear power. The performance of the fuel element serving as a nuclear power plant reactor core component is one of the most main influence factors of nuclear power safety and economy, so that the research on the fuel element is put on a very prominent position internationally, various performances of the nuclear fuel element are continuously improved by optimizing the design of the fuel element, adopting advanced structural materials, improving the element manufacturing process and other methods, and the nuclear power is promoted to be developed towards a safer and more economic direction.
At present, rod-shaped fuel is generally adopted in a pressurized water reactor nuclear power plant, the unloading fuel consumption of a component can be deepened, the material changing period can be prolonged, the operation cost of the power plant is reduced, and the nuclear power economy is improved. The average designed fuel consumption of the pressurized water reactor fuel assembly is gradually improved from 10-15 Gwd/tU at the early stage to 60-70 Gwd/tU till now, and the refueling period is correspondingly prolonged from 12 months to 18 or 24 months at present. Increased fuel assembly burn-up also entails a number of problems such as increased amounts of fission gas emissions, increased cladding corrosion and hydrogen absorption, fuel pellet swelling, increased radiation growth of the fuel elements and assemblies. How to solve these problems has been an important task in the international research on pressurized water reactor fuel elements, such as the development of advanced cladding with good corrosion resistance, using pellets with a low fission gas release rate. In addition, the overall safety of the reactor core is improved by improving the design of the positioning grid, increasing the critical heat flux density of the components and the like. In summary, rod fuel assembly configurations and parameters have been continuously optimized in recent 50 years, and rod fuel-based technology improvements have been very limited in potential for improving nuclear power economy and safety, so that fuel elements with other geometries have become a new development concept in recent years.
At least the following five basic requirements are met for a fuel element of novel geometry: 1) the surface area/volume ratio of the fuel can be improved; 2) the thickness of the core block can be reduced; 3) has enough rigidity; 4) the pressure drop of the reactor core can be reduced; 5) the assembly has an open grid design. The concept of annular fuel elements for light water reactors, which was first proposed by the american academy of technology of massachusetts, well meets the above 5 requirements. The annular fuel is formed by manufacturing fuel pellets into an annular shape, and adding the cladding tubes on the inner surface and the outer surface of the fuel pellets, so that a coolant can simultaneously cool the element from the inner flow passage and the outer flow passage. Better fuel performance can be expected under normal operating and transient conditions.
The annular fuel is an advanced fuel element completely reformed in structure, can greatly improve the heat transfer efficiency of the fuel element, reduce the temperature of fuel pellets, and remarkably improve the safety and the economy of a reactor, has become one of important development trends of advanced fuel assemblies of pressurized water reactors, and is concerned by the industry in the world. Research and development of annular fuel are carried out successively in countries of America, Korea and the like, and research shows that the annular fuel has good application prospect.
In the design process of the annular fuel assembly, a blasting test performance test research needs to be carried out urgently, at present, a similar technology does not exist, and a new structure also faces a new problem; secondly, according to the operational experience of the conventional pressurized water reactor, different fuel rods have different axial growths even in the same assembly. Therefore, it can be concluded that different axial growth of the double shelled annular fuel is also possible.
Disclosure of Invention
The invention aims to develop and design an annular fuel cladding test piece capable of heating inside and outside simultaneously, and solve the problem of experimental study on the performance of the whole stack outside of the annular fuel inner and outer cladding.
The technical scheme of the invention is as follows:
an annular fuel cladding test piece capable of being heated inside and outside simultaneously comprises an electric heating core body assembly, an inner cladding and outer cladding combined test piece, an air inlet connecting pipe assembly and a positioning assembly;
electric heating core assembly
The whole electric heating wire core body component is of a rod-shaped structure, wherein the effective heating section is positioned in the middle of the whole electric heating core body;
the electric heating wire core component comprises two electric heating wires; the electric heating power of the two electric heating wires can be respectively controlled;
the inner and outer cladding combined test piece comprises an inner cladding, an outer cladding, an upper end plug, a lower end plug and four thermocouples;
the inner cladding and the outer cladding are both tubular structures;
the inner cladding shell and the outer cladding shell are coaxially sleeved to form a sleeve structure;
a round hole is arranged at the upper end of the outer cladding;
an upper end plug and a lower end plug are respectively arranged at the upper end and the lower end of the inner cladding and the outer cladding, and the annular sleeve space between the inner cladding and the outer cladding is sealed by the upper end plug and the lower end plug;
the upper end plug and the lower end plug have the same structure, the outer diameter of the upper end plug is consistent with that of the outer wrapping shell, and the inner diameter of the upper end plug is consistent with that of the inner wrapping shell;
an upper positioning bulge and a lower positioning bulge are respectively arranged in the upper end plug and the lower end plug;
a thermocouple in the middle of the inner cladding is arranged on the inner wall of the length center of the inner cladding;
the inner wall of the upper part of the length of the inner cladding is provided with a thermocouple at the upper part of the inner cladding;
a thermocouple in the middle of the outer cladding is arranged on the outer wall of the length center of the outer cladding;
arranging a thermocouple on the upper part of the outer cladding at the outer wall of the upper part of the length of the outer cladding;
the air inlet connecting pipe assembly comprises an air loop connecting pipe, a test piece connecting pipe and a square air inlet connecting block;
one end of the gas loop connecting pipe is connected with an external gas supply system, and the other end of the gas loop connecting pipe is connected with a test piece connecting pipe;
the external gas supply system provides gas for the gas inlet connecting pipe assembly, and the type of the gas is helium or nitrogen;
the outer diameter of the test piece connecting pipe is matched with the inner diameter of the gas loop connecting pipe and is welded and fixed;
the test piece connecting pipe is connected with the outer casing through a square air inlet connecting block;
the square air inlet connecting block is of a cuboid structure, a round pore passage is formed in the middle of the square air inlet connecting block and serves as an air inlet, a round hole is formed in the side face of the square air inlet connecting block, and a test piece connecting pipe is inserted into the round hole in the side face and is welded and connected;
after the test piece connecting pipe is inserted into the round hole in the side face of the square air inlet connecting block, the air inlet is connected with the round hole formed in the upper end of the outer casing, and air is introduced into the inner outer casing through the air inlet and is pressurized;
fourthly, the positioning assembly comprises an upper positioning block and a lower positioning block;
the upper positioning block and the lower positioning block have the same structure, the outer diameter of the upper positioning block is consistent with that of the outer wrapping shell, and the inner diameter of the upper positioning block is consistent with that of the electric heating core assembly;
an upper positioning groove is formed in the center of the section on one side of the upper positioning block, and a lower positioning groove is formed in the center of the section on one side of the lower positioning block;
the upper positioning groove is matched with an upper positioning bulge arranged in the upper end plug, and the lower positioning groove is matched with a lower positioning bulge arranged in the lower end plug.
Further, as described above, in the annular fuel cladding test piece heated simultaneously inside and outside, the electric heating wire core assembly is integrally a rod-shaped structure with the length of 800-1000mm and the diameter of 6mm, wherein the length of the effective heating section is 600 mm.
Furthermore, in the annular fuel cladding test piece capable of heating inside and outside simultaneously, in the core component of the electric heating wire, the specifications of the two electric heating wires are consistent, the material adopts nickel-cadmium electrothermal alloy, and the material is one of Cr20Ni80, Cr15Ni60, GH140 and Cr20Ni 35; the maximum using temperature of the electric heating wire is 1100-1200 ℃, and the maximum heating power is 10 kW/m.
Further, the annular fuel cladding test piece capable of being heated inside and outside simultaneously is characterized in that the inner cladding is of a tubular structure with the length of 650mm, the inner diameter of 8.2mm and the thickness of 0.57 mm; the outer casing is a tubular structure with the length of 650mm, the outer diameter of 15.7mm and the thickness of 0.74 mm; a round hole with the diameter of 1-2mm is arranged at the position 30-50mm away from the top end of the outer cladding.
Further, according to the annular fuel cladding test piece capable of being heated inside and outside simultaneously, the upper end plug seals the upper ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding line is 10-15 MPa; the lower end plugs seal the lower ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa.
Further, the annular fuel cladding test piece which is heated inside and outside simultaneously is characterized in that the thermocouple at the upper part of the inner cladding is arranged on the inner wall of the position 200mm away from the top end of the inner cladding on the length upper part of the inner cladding; arranging a thermocouple at the upper part of the outer cladding at the inner wall of the position 200mm away from the top end of the outer cladding on the length upper part of the outer cladding; the thermocouple is fixed in a spot welding mode, and the diameter of a welding spot is not more than 2 times of the diameter of the thermocouple.
Further, the annular fuel cladding test piece capable of being heated inside and outside simultaneously is characterized in that the outer diameter of the gas loop connecting pipe is 10mm, the thickness of the gas loop connecting pipe is 2mm, and the gas loop connecting pipe is made of S30408 stainless steel; the square air inlet connecting block is of a cuboid structure, the length of the square air inlet connecting block is 21.5mm, the width of the square air inlet connecting block is 21.5mm, the height of the square air inlet connecting block is 12mm, a circular hole channel with the diameter of 15.48mm is formed in the middle of the square air inlet connecting block, and a circular hole with the diameter of 6.2mm is formed in the side surface of; the test piece connecting pipe with the diameter of 6mm is inserted into the side round hole for 3mm and is welded.
Further, the length of the upper positioning block and the length of the lower positioning block are both 10 mm; the width of the upper positioning groove and the width of the lower positioning groove are both 2 mm.
Further, the annular fuel cladding test piece capable of being heated inside and outside simultaneously is applied to one of a pressurized water reactor, a boiling water reactor, a heavy water reactor, a fast reactor, a power reactor and a marine power reactor.
The technical scheme of the invention has the beneficial effects that:
1. the inner cladding can be controllably heated through the annular electric heating core body component with the electric heating power of each electric heating wire capable of being respectively controlled; and the linear power density is high, the test requirements can be met, and a higher heating rate can be achieved.
2. Through the arrangement of the structure and the connection of all the components in the structure, a larger temperature difference can be formed in the circumferential direction of the inner cladding of the annular fuel rod, so that the temperature environment required by a better simulation test is realized, and the heat transfer working condition of the material from outside to inside is completely simulated.
3. Through the arrangement of the structure and the connection of all the components, the requirement of the inner pressure bearing of the inner cladding of the annular fuel rod during various tests can be met; and the volume of the air cavity is adjustable, so that various test environments can be better simulated.
Drawings
FIG. 1 is a schematic illustration of a test piece of the present invention for an annular fuel clad which is heated both internally and externally;
FIG. 2 is a schematic diagram of an electrical heating core assembly;
FIG. 3 is a schematic view of the upper end plug construction (with which the lower end plug construction is identical);
FIG. 4 is a schematic view of the upper positioning block structure (to which the lower positioning block structure corresponds);
FIG. 5 is a schematic view of the inner and outer envelope construction;
FIG. 6 is a schematic view of a square inlet connection block configuration;
FIG. 7 is a schematic view of a test piece connecting tube;
FIG. 8 is a schematic view of an air passage connection tube configuration.
In the figure: 1, electrically heating a core component; 2: a lower end plug; 3: a lower positioning block; 4: an inner envelope; 5: an outer envelope; 6: a square air inlet connecting block; 7: an upper end plug; 8: an upper positioning block; 9: the gas circuit connecting pipe; 10: a test piece connecting pipe; 11: a thermocouple on the upper part of the inner cladding; 12: a thermocouple at the upper part of the outer envelope; 13: a thermocouple in the middle of the outer casing; 14: inner cladding middle thermocouple.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in FIG. 1, the annular fuel cladding test piece capable of being heated inside and outside simultaneously comprises an electric heating core body assembly, an inner and outer cladding combined test piece, an air inlet connecting pipe assembly and a positioning assembly;
electric heating core assembly
As shown in fig. 2, the whole electrical heating wire core assembly is a rod-shaped structure with a length of 800-;
the electric heating wire core component comprises two electric heating wires; the electric heating power of the two electric heating wires can be respectively controlled;
in the electric heating wire core body component, the specifications of two electric heating wires are consistent, the material adopts nickel-cadmium electrothermal alloy, and the material is one of Cr20Ni80, Cr15Ni60, GH140 and Cr20Ni 35; the maximum using temperature of the electric heating wire is 1100-1200 ℃, and the maximum heating power is 10 kW/m.
The inner and outer cladding combined test piece comprises an inner cladding, an outer cladding, an upper end plug, a lower end plug and four thermocouples;
as shown in FIG. 5, the inner casing is a tubular structure with a length of 650mm, an inner diameter of 8.2mm and a thickness of 0.57 mm;
the outer casing is a tubular structure with the length of 650mm, the outer diameter of 15.7mm and the thickness of 0.74 mm;
a round hole with the diameter of 1-2mm is arranged at the position 30-50mm away from the top end of the outer cladding.
An upper end plug and a lower end plug are respectively arranged at the upper end and the lower end of the inner cladding and the outer cladding, and the annular sleeve space between the inner cladding and the outer cladding is sealed by the upper end plug and the lower end plug;
as shown in fig. 3, the upper end plug and the lower end plug have the same structure, the outer diameter is consistent with the outer diameter of the outer casing, and the inner diameter is consistent with the inner diameter of the inner casing;
an upper positioning bulge and a lower positioning bulge are respectively arranged in the upper end plug and the lower end plug;
a thermocouple in the middle of the inner cladding is arranged on the inner wall of the length center of the inner cladding;
arranging a thermocouple at the upper part of the inner cladding on the inner wall of the upper part of the length of the inner cladding, which is 200mm away from the top end of the inner cladding;
a thermocouple in the middle of the outer cladding is arranged on the outer wall of the length center of the outer cladding;
arranging a thermocouple at the upper part of the outer cladding at the inner wall of the position 200mm away from the top end of the outer cladding on the length upper part of the outer cladding;
the thermocouple is fixed in a spot welding mode, and the diameter of a welding spot is not more than 2 times of the diameter of the thermocouple.
The upper end plugs seal the upper ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa;
the lower end plugs seal the lower ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa.
The air inlet connecting pipe assembly comprises an air loop connecting pipe, a test piece connecting pipe and a square air inlet connecting block;
as shown in fig. 8, the gas circuit connecting pipe has an outer diameter of 10mm and a thickness of 2mm, and is made of S30408 stainless steel;
one end of the gas loop connecting pipe is connected with an external gas supply system, and the other end of the gas loop connecting pipe is connected with a test piece connecting pipe;
the external gas supply system provides gas for the gas inlet connecting pipe assembly, and the type of the gas is helium or nitrogen;
as shown in fig. 7, the outer diameter of the test piece connecting pipe is matched with the inner diameter of the gas circuit connecting pipe and is welded and fixed;
the test piece connecting pipe is connected with the outer casing through a square air inlet connecting block;
as shown in fig. 6, the square air inlet connecting block is a cuboid structure, the length is 21.5mm, the width is 21.5mm, the height is 12mm, a circular pore channel with the diameter of 15.48mm is arranged in the middle, and a circular hole with the diameter of 6.2mm is arranged on the side surface; the test piece connecting pipe with the diameter of 6mm is inserted into the side round hole for 3mm and is welded.
After the test piece connecting pipe is inserted into the round hole in the side face of the square air inlet connecting block, the air inlet is connected with the round hole formed in the upper end of the outer casing, and air is introduced into the inner outer casing through the air inlet and is pressurized;
fourthly, the positioning assembly comprises an upper positioning block and a lower positioning block;
as shown in fig. 4, the upper positioning block and the lower positioning block have the same structure, the outer diameter is consistent with the outer diameter of the outer casing, and the inner diameter is consistent with the inner diameter of the electric heating core assembly;
the length of the upper positioning block and the length of the lower positioning block are both 10 mm;
the widths of the upper positioning groove and the lower positioning groove are both 2 mm;
the upper positioning groove is matched with an upper positioning bulge arranged in the upper end plug, and the lower positioning groove is matched with a lower positioning bulge arranged in the lower end plug.
During assembly, the lower positioning groove is upwards positioned, and the lower positioning block is welded and connected with the lower positioning bulge of the lower end plug in the electric heating core assembly, so that the cladding combined test piece is positioned in the lower radial direction;
and then the upper positioning groove faces downwards to be assembled with the test piece, and then the upper positioning block is welded and connected with the upper positioning bulge of the upper end plug in the electric heating core body assembly, so that the cladding combined test piece is fixedly positioned at the upper part.
The annular fuel cladding test piece capable of heating inside and outside simultaneously is applied to one of a pressurized water reactor, a boiling water reactor, a heavy water reactor, a fast reactor, a power reactor and a marine power reactor.
The method of carrying out the present invention has been described in detail with reference to the examples, but the present invention is not limited to the examples described above, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. The prior art can be adopted for the content which is not described in detail in the specification of the invention.
Claims (10)
1. The utility model provides an inside and outside annular fuel cladding test piece of concurrent heating which characterized in that: the test device comprises an electric heating core body assembly, an inner and outer cladding combined test piece, an air inlet pipe connecting assembly and a positioning assembly;
electric heating core assembly
The whole electric heating wire core body component is of a rod-shaped structure, wherein the effective heating section is positioned in the middle of the whole electric heating core body;
the electric heating wire core component comprises two electric heating wires; the electric heating power of the two electric heating wires can be respectively controlled;
the inner and outer cladding combined test piece comprises an inner cladding, an outer cladding, an upper end plug, a lower end plug and four thermocouples;
the inner cladding and the outer cladding are both tubular structures;
the inner cladding shell and the outer cladding shell are coaxially sleeved to form a sleeve structure;
a round hole is arranged at the upper end of the outer cladding;
an upper end plug and a lower end plug are respectively arranged at the upper end and the lower end of the inner cladding and the outer cladding, and the annular sleeve space between the inner cladding and the outer cladding is sealed by the upper end plug and the lower end plug;
the upper end plug and the lower end plug have the same structure, the outer diameter of the upper end plug is consistent with that of the outer wrapping shell, and the inner diameter of the upper end plug is consistent with that of the inner wrapping shell;
an upper positioning bulge and a lower positioning bulge are respectively arranged in the upper end plug and the lower end plug;
a thermocouple in the middle of the inner cladding is arranged on the inner wall of the length center of the inner cladding;
the inner wall of the upper part of the length of the inner cladding is provided with a thermocouple at the upper part of the inner cladding;
a thermocouple in the middle of the outer cladding is arranged on the outer wall of the length center of the outer cladding;
arranging a thermocouple on the upper part of the outer cladding at the outer wall of the upper part of the length of the outer cladding;
the air inlet connecting pipe assembly comprises an air loop connecting pipe, a test piece connecting pipe and a square air inlet connecting block;
one end of the gas loop connecting pipe is connected with an external gas supply system, and the other end of the gas loop connecting pipe is connected with a test piece connecting pipe;
the external gas supply system provides gas for the gas inlet connecting pipe assembly, and the type of the gas is helium or nitrogen;
the outer diameter of the test piece connecting pipe is matched with the inner diameter of the gas loop connecting pipe and is welded and fixed;
the test piece connecting pipe is connected with the outer casing through a square air inlet connecting block;
the square air inlet connecting block is of a cuboid structure, a round pore passage is formed in the middle of the square air inlet connecting block and serves as an air inlet, a round hole is formed in the side face of the square air inlet connecting block, and a test piece connecting pipe is inserted into the round hole in the side face and is welded and connected;
after the test piece connecting pipe is inserted into the round hole in the side face of the square air inlet connecting block, the air inlet is connected with the round hole formed in the upper end of the outer casing, and air is introduced into the inner outer casing through the air inlet and is pressurized;
fourthly, the positioning assembly comprises an upper positioning block and a lower positioning block;
the upper positioning block and the lower positioning block have the same structure, the outer diameter of the upper positioning block is consistent with that of the outer wrapping shell, and the inner diameter of the upper positioning block is consistent with that of the electric heating core assembly;
an upper positioning groove is formed in the center of the section on one side of the upper positioning block, and a lower positioning groove is formed in the center of the section on one side of the lower positioning block;
the upper positioning groove is matched with an upper positioning bulge arranged in the upper end plug, and the lower positioning groove is matched with a lower positioning bulge arranged in the lower end plug.
2. The annular fuel clad test piece of claim 1, wherein: the whole electric heating wire core component is a rod-shaped structure with the length of 800-1000mm and the diameter of 6mm, wherein the length of the effective heating section is 600 mm.
3. The annular fuel clad test piece of claim 1, wherein: in the electric heating wire core body component, the specifications of two electric heating wires are consistent, the material adopts nickel-cadmium electrothermal alloy, and the material is one of Cr20Ni80, Cr15Ni60, GH140 and Cr20Ni 35; the maximum using temperature of the electric heating wire is 1100-1200 ℃, and the maximum heating power is 10 kW/m.
4. The annular fuel clad test piece of claim 1, wherein: the inner cladding is a tubular structure with the length of 650mm, the inner diameter of 8.2mm and the thickness of 0.57 mm; the outer casing is a tubular structure with the length of 650mm, the outer diameter of 15.7mm and the thickness of 0.74 mm; a round hole with the diameter of 1-2mm is arranged at the position 30-50mm away from the top end of the outer cladding.
5. The annular fuel clad test piece of claim 1, wherein: the upper end plugs seal the upper ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa; the lower end plugs seal the lower ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa.
6. The annular fuel clad test piece of claim 1, wherein: arranging a thermocouple at the upper part of the inner cladding on the inner wall of the upper part of the length of the inner cladding, which is 200mm away from the top end of the inner cladding; arranging a thermocouple at the upper part of the outer cladding at the inner wall of the position 200mm away from the top end of the outer cladding on the length upper part of the outer cladding; the thermocouple is fixed in a spot welding mode, and the diameter of a welding spot is not more than 2 times of the diameter of the thermocouple.
7. The annular fuel clad test piece of claim 1, wherein: the outer diameter of the gas loop connecting pipe is 10mm, the thickness of the gas loop connecting pipe is 2mm, and the gas loop connecting pipe is made of S30408 stainless steel; the square air inlet connecting block is of a cuboid structure, the length of the square air inlet connecting block is 21.5mm, the width of the square air inlet connecting block is 21.5mm, the height of the square air inlet connecting block is 12mm, a circular hole channel with the diameter of 15.48mm is formed in the middle of the square air inlet connecting block, and a circular hole with the diameter of 6.2mm is formed in the side surface of; the test piece connecting pipe with the diameter of 6mm is inserted into the side round hole for 3mm and is welded.
8. The annular fuel clad test piece of claim 1, wherein: the length of the upper positioning block and the length of the lower positioning block are both 10 mm; the width of the upper positioning groove and the width of the lower positioning groove are both 2 mm.
9. The annular fuel clad test piece of claim 1, wherein: the whole electric heating wire core component is of a rod-shaped structure with the length of 800-1000mm and the diameter of 6mm, wherein the length of the effective heating section is 600 mm;
in the electric heating wire core body component, the specifications of two electric heating wires are consistent, the material adopts nickel-cadmium electrothermal alloy, and the material is one of Cr20Ni80, Cr15Ni60, GH140 and Cr20Ni 35; the maximum using temperature of the electric heating wire is 1100-1200 ℃, and the maximum heating power is 10 kW/m;
the inner cladding is a tubular structure with the length of 650mm, the inner diameter of 8.2mm and the thickness of 0.57 mm; the outer casing is a tubular structure with the length of 650mm, the outer diameter of 15.7mm and the thickness of 0.74 mm; a round hole with the diameter of 1-2mm is arranged at the position 30-50mm away from the top end of the outer cladding;
the upper end plugs seal the upper ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa; the lower end plugs seal the lower ends of the inner cladding and the outer cladding in a welding mode, and the pressure bearing capacity of a welding seam is 10-15 MPa;
arranging a thermocouple at the upper part of the inner cladding on the inner wall of the upper part of the length of the inner cladding, which is 200mm away from the top end of the inner cladding; arranging a thermocouple at the upper part of the outer cladding at the inner wall of the position 200mm away from the top end of the outer cladding on the length upper part of the outer cladding; the thermocouple is fixed in a spot welding mode, and the diameter of a welding spot is not more than 2 times of the diameter of the thermocouple;
the outer diameter of the gas loop connecting pipe is 10mm, the thickness of the gas loop connecting pipe is 2mm, and the gas loop connecting pipe is made of S30408 stainless steel; the square air inlet connecting block is of a cuboid structure, the length of the square air inlet connecting block is 21.5mm, the width of the square air inlet connecting block is 21.5mm, the height of the square air inlet connecting block is 12mm, a circular hole channel with the diameter of 15.48mm is formed in the middle of the square air inlet connecting block, and a circular hole with the diameter of 6.2mm is formed in the side surface of; a test piece connecting pipe with the diameter of 6mm is inserted into the side round hole for 3mm and is welded and connected to form an air inlet connecting pipe assembly;
the length of the upper positioning block and the length of the lower positioning block are both 10 mm; the width of the upper positioning groove and the width of the lower positioning groove are both 2 mm.
10. An internally and externally simultaneously heated annular fuel clad test piece according to claims 1-9, wherein: the annular fuel cladding test piece capable of heating inside and outside simultaneously is applied to one of a pressurized water reactor, a boiling water reactor, a heavy water reactor, a fast reactor, a power reactor and a marine power reactor.
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114121320A (en) * | 2021-11-23 | 2022-03-01 | 中国核动力研究设计院 | Spontaneous thermal corrosion sample for fuel cladding of nuclear power plant, preparation method and test device |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5533078A (en) * | 1994-09-29 | 1996-07-02 | Siemens Power Corporation | Nuclear fuel assembly for a pressurized water reactor |
CN104575637A (en) * | 2014-12-15 | 2015-04-29 | 中国核电工程有限公司 | Testing device and testing method for simulating fuel jacket performance |
CN106328226A (en) * | 2016-09-21 | 2017-01-11 | 中国核动力研究设计院 | Nuclear reactor fuel rod simulating electric heating device and assembly process |
CN109211966A (en) * | 2018-09-10 | 2019-01-15 | 西安交通大学 | A kind of annular fuel hot-fluid separating experiment device and method |
CN109935349A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end |
CN110600150A (en) * | 2019-09-19 | 2019-12-20 | 中国核动力研究设计院 | Irradiation test device for metal type fast reactor fuel element |
CN212675929U (en) * | 2020-05-25 | 2021-03-09 | 中国原子能科学研究院 | Annular fuel cladding test piece capable of heating inside and outside simultaneously |
-
2020
- 2020-05-25 CN CN202010448582.5A patent/CN111477368A/en active Pending
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5533078A (en) * | 1994-09-29 | 1996-07-02 | Siemens Power Corporation | Nuclear fuel assembly for a pressurized water reactor |
CN104575637A (en) * | 2014-12-15 | 2015-04-29 | 中国核电工程有限公司 | Testing device and testing method for simulating fuel jacket performance |
CN106328226A (en) * | 2016-09-21 | 2017-01-11 | 中国核动力研究设计院 | Nuclear reactor fuel rod simulating electric heating device and assembly process |
CN109935349A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end |
CN109211966A (en) * | 2018-09-10 | 2019-01-15 | 西安交通大学 | A kind of annular fuel hot-fluid separating experiment device and method |
CN110600150A (en) * | 2019-09-19 | 2019-12-20 | 中国核动力研究设计院 | Irradiation test device for metal type fast reactor fuel element |
CN212675929U (en) * | 2020-05-25 | 2021-03-09 | 中国原子能科学研究院 | Annular fuel cladding test piece capable of heating inside and outside simultaneously |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114121320A (en) * | 2021-11-23 | 2022-03-01 | 中国核动力研究设计院 | Spontaneous thermal corrosion sample for fuel cladding of nuclear power plant, preparation method and test device |
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