CN111477369A - Test device for bulging and blasting of cladding in pressure-bearing annular fuel rod - Google Patents
Test device for bulging and blasting of cladding in pressure-bearing annular fuel rod Download PDFInfo
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- CN111477369A CN111477369A CN202010448600.XA CN202010448600A CN111477369A CN 111477369 A CN111477369 A CN 111477369A CN 202010448600 A CN202010448600 A CN 202010448600A CN 111477369 A CN111477369 A CN 111477369A
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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
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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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- 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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention belongs to the technical field of nuclear fuel assembly test devices, and particularly relates to a test device for bulging blasting of an inner cladding of a pressure-bearing annular fuel rod. The test device for bulging blasting of the inner cladding of the pressure-bearing annular fuel rod comprises a transition joint, an annular electric heating core body assembly, an annular simulation pellet, an inner cladding assembly and an air inlet connecting pipe assembly. 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. The test device for bulging and blasting the cladding in the pressure-bearing annular fuel rod can be applied to pressurized water reactors, boiling water reactors, heavy water reactors, fast reactors, power reactors and marine power reactors.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel assembly test devices, and particularly relates to a test device for bulging blasting of an inner cladding of a pressure-bearing annular fuel rod.
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 a test device for bulging and blasting of inner cladding of a pressure-bearing annular fuel rod, which is used for solving the problem of a test device adopted in an outer-pile safety test of inner cladding of annular fuel under the working conditions of different heating rates, and is used for determining the corresponding relation and specific numerical values of the blasting temperature, the blasting pressure and the blasting strain of the inner cladding of annular fuel under the working condition of L OCA, and providing data support for the safety check of the annular fuel in pile.
The technical scheme of the invention is as follows:
a test device for bulging blasting of an inner cladding of a pressure-bearing annular fuel rod comprises a transition joint, an annular electric heating core body assembly, an annular simulation core block, an inner cladding assembly and an air inlet connecting pipe assembly;
the transition joint is of an annular structure and is respectively arranged at the upper end and the lower end of the whole device, and comprises two joints which are coaxially arranged up and down, namely an upper transition joint and a lower transition joint;
annular electric heating core assembly
The whole double electric heating wire core body is of a ring structure; wherein the effective heating section is positioned in the middle of the whole electric heating core body;
two electric heating wires are arranged in the double-electric heating wire core body, and the electric heating power of each electric heating wire can be respectively controlled;
third, inner packaging shell assembly
The inner casing component is a tubular structure;
the inner wall of the length center of the inner cladding component is provided with an inner cladding middle thermocouple;
an inner cladding upper thermocouple is arranged on the inner wall of the upper one third of the length of the inner cladding assembly;
four, ring-shaped simulation core block
The annular simulation core block is a tubular structural member;
fifthly, the air inlet connecting pipe assembly comprises an air loop connecting pipe, a test piece connecting pipe, a square air inlet connecting block and an air inlet transition joint;
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 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, and the pressure-bearing range of a welding seam is 10-15 MPa;
the test piece connecting pipe is connected with the upper transition joint through the square air inlet connecting block;
the square air inlet connecting block is of a cuboid structure, a circular pore is formed in the middle of the square air inlet connecting block, a circular hole is formed in the side face of the square air inlet connecting block, and a test piece connecting pipe is inserted into the circular hole in the side face and is welded and connected to form an air inlet connecting pipe assembly;
the top of the air inlet connecting pipe assembly is connected with the upper transition joint in a welding manner, and the bottom of the air inlet connecting pipe assembly is connected with the air inlet transition joint in a welding manner;
the bottom end of the air inlet transition joint is connected with the top end of the annular electric heating core body assembly;
the whole device is respectively provided with an upper transition joint, a square air inlet connecting block, an air inlet transition joint, an annular electric heating core body assembly and a lower transition joint which are coaxially arranged from top to bottom along the axial direction, a closed cavity is formed among the components, and an annular fuel simulation pellet is arranged in the cavity close to the annular fuel inner cladding.
Further, according to the test device for bulging and blasting of the cladding in the pressure-bearing annular fuel rod, the upper transition joint is made of S30408, is arranged at the upper end of the whole device, and has an inner diameter of 11mm and an outer diameter of 16 mm;
the lower transition joint is made of Zr-4 and is arranged at the lower end of the whole device, and the inner diameter of the lower transition joint is 10.4mm, and the outer diameter of the lower transition joint is 16 mm.
Further, according to the bulging blasting test device for the inner cladding of the pressure-bearing annular fuel rod, the upper transition joint and the lower transition joint are fixedly connected to the inner cladding assembly through welding respectively, and the pressure-bearing range of a welding seam is 10-15 MPa.
Further, according to the bulging explosion test device for the inner cladding of the pressure-bearing annular fuel rod, the whole double electric heating wire core is of an annular structure with the length of 800-1000mm, the inner diameter of 13mm and the outer diameter of 25 mm; wherein the length of the effective heating section is 600mm and is positioned in the middle of the whole electric heating core body; the outer surface of the double electric heating wire core is smooth, and the roughness is 1.6 um;
the material of each electric heating wire is nickel-cadmium electric heating alloy, the material brand is Cr20Ni80, the diameter is 0.7mm, the maximum using temperature is 1100-1200 ℃, the thread pitch is 1.45mm, the heating efficiency is more than 95 percent, and the adjustable electric heating maximum power is 10 kW/m.
Further, according to the bulging explosion test device for the inner cladding of the pressure-bearing annular fuel rod, the inner cladding assembly is of a tubular structure with the length of 690mm, the outer diameter of 9.34mm and the thickness of 0.57 mm.
Furthermore, in the bulging and blasting test device for the inner cladding of the pressure-bearing annular fuel rod, in the inner cladding assembly, the thermocouple in the middle of the inner cladding and the thermocouple on the upper part of the inner cladding are fixed on the inner wall of the inner cladding assembly 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, as for the test device for the bulging blasting of the inner cladding of the pressure-bearing annular fuel rod, the annular simulation pellet is a tubular structural member made of aluminum oxide material and having an inner diameter of 10.34mm and an outer diameter of 12.34 mm.
Further, according to the test device for bulging and blasting of the cladding in the pressure-bearing annular fuel rod, the outer diameter of the gas circuit connecting pipe is 10mm, the thickness of the gas circuit connecting pipe is 2mm, and the gas circuit 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, a circular hole with the diameter of 6.2mm is formed in the side face of the square air inlet connecting block, a test piece connecting pipe with the diameter of 6mm is inserted into the circular hole in the.
Further, the method for the bulging and blasting test of the inner cladding of the pressure-bearing annular fuel rod uses the bulging and blasting test device for the inner cladding of the pressure-bearing annular fuel rod; the reactor 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 view of the overall structure of an annular fuel rod inner cladding bulging explosion test device of the present invention;
FIG. 2 is an exterior view of a transition joint assembly component (upper transition joint and lower transition joint configuration are identical);
FIG. 3 is a schematic structural view of an annular electric heating core;
FIG. 4 is a schematic diagram of a ring-shaped simulation core block structure;
FIG. 5 is a schematic structural view of a test sample of the annular fuel inner cladding;
FIG. 6 is a schematic view of an intake transition joint configuration;
FIG. 7 is a schematic view of a square inlet connector block;
FIG. 8 is a schematic view of the structure of the inlet connecting tube of the test piece.
In the figure: 1, transition joint; 2: an annular electrically heated core; 3: an annular simulation core block; 4: an upper thermocouple; 5: a middle thermocouple; 6: an annular fuel inner cladding test sample; 7: an air intake transition joint; 8: a square air inlet connecting block; 9; the gas circuit connecting pipe.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, the test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod comprises a transition joint, an annular electric heating core assembly, an annular simulation pellet, an inner cladding assembly and an air inlet connecting pipe assembly;
firstly, as shown in fig. 2, the transition joint is an annular structure and is respectively arranged at the upper end and the lower end of the whole device, and comprises two joints which are coaxially arranged up and down, namely an upper transition joint and a lower transition joint;
the upper transition joint is made of S30408, is arranged at the upper end of the whole device, and has an inner diameter of 11mm and an outer diameter of 16 mm;
the lower transition joint is made of Zr-4 and is arranged at the lower end of the whole device, and the inner diameter of the lower transition joint is 10.4mm, and the outer diameter of the lower transition joint is 16 mm.
The upper transition joint and the lower transition joint are fixedly connected to the inner casing assembly through welding respectively, and the pressure-bearing range of a welding seam is 10-15 MPa.
Annular electric heating core assembly
As shown in FIG. 3, the whole double electric heating wire core is an annular structure with the length of 800-1000mm, the inner diameter of 13mm and the outer diameter of 25 mm; wherein the length of the effective heating section is 600mm and is positioned in the middle of the whole electric heating core body; the outer surface of the double electric heating wire core is smooth, and the roughness is 1.6 um;
the material of each electric heating wire is nickel-cadmium electric heating alloy, the material brand is Cr20Ni80, the diameter is 0.7mm, the maximum using temperature is 1100-1200 ℃, the thread pitch is 1.45mm, the heating efficiency is more than 95 percent, and the adjustable electric heating maximum power is 10 kW/m.
Third, inner packaging shell assembly
As shown in FIG. 5, the inner shroud assembly is a tubular structure with a length of 690mm, an outer diameter of 9.34mm and a thickness of 0.57 mm.
The inner wall of the length center of the inner cladding component is provided with an inner cladding middle thermocouple;
an inner cladding upper thermocouple is arranged on the inner wall of the upper one third of the length of the inner cladding assembly;
and the thermocouple in the middle of the inner cladding shell and the thermocouple on the upper part of the inner cladding shell are fixed on the inner wall of the inner cladding shell assembly in a spot welding mode, and the diameter of a welding spot is not more than 2 times of the diameter of the thermocouple.
Four, ring-shaped simulation core block
As shown in FIG. 4, the annular mock pellet was a tubular structure of alumina material with an inner diameter of 10.34mm and an outer diameter of 12.34 mm.
Fifthly, the air inlet connecting pipe assembly comprises an air loop connecting pipe, a test piece connecting pipe, a square air inlet connecting block and an air inlet transition joint;
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;
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 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, and the pressure-bearing range of a welding seam is 10-15 MPa;
the test piece connecting pipe is connected with the upper transition joint through the square air inlet connecting block;
as shown in fig. 7, 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 formed in the middle, a circular hole with the diameter of 6.2mm is formed in the side surface, a test piece connecting pipe with the diameter of 6mm is inserted into the circular hole of the side surface for 3mm, and the air inlet connecting pipe assembly shown in fig. 8 is formed by welding connection.
The top of the air inlet connecting pipe assembly is connected with the upper transition joint in a welding manner, and the bottom of the air inlet connecting pipe assembly is connected with the air inlet transition joint in a welding manner; as shown in fig. 6, the bottom end of the air inlet transition joint is connected with the top end of the annular electric heating core assembly;
the whole device is respectively provided with an upper transition joint, a square air inlet connecting block, an air inlet transition joint, an annular electric heating core body assembly and a lower transition joint which are coaxially arranged from top to bottom along the axial direction, a closed cavity is formed among the components, and an annular fuel simulation pellet is arranged in the cavity close to the annular fuel inner cladding.
A bulging blasting test method for an inner cladding of a pressure-bearing annular fuel rod uses the bulging blasting test device for the inner cladding of the pressure-bearing annular fuel rod; the reactor is applied to a pressurized water reactor, a boiling water reactor, a heavy water reactor, a fast reactor, a power reactor and a marine power reactor.
The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod can also be used in the fields of tubular heat transfer tests, dynamic water corrosion tests and the like.
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 a cladding bulging blasting test device in pressure-bearing annular fuel rod which characterized in that:
the device comprises a transition joint, an annular electric heating core body assembly, an annular simulation core block, an inner packaging shell assembly and an air inlet connecting pipe assembly;
the transition joint is of an annular structure and is respectively arranged at the upper end and the lower end of the whole device, and comprises two joints which are coaxially arranged up and down, namely an upper transition joint and a lower transition joint;
annular electric heating core assembly
The whole double electric heating wire core body is of a ring structure; wherein the effective heating section is positioned in the middle of the whole electric heating core body;
two electric heating wires are arranged in the double-electric heating wire core body, and the electric heating power of each electric heating wire can be respectively controlled;
third, inner packaging shell assembly
The inner casing component is a tubular structure;
the inner wall of the length center of the inner cladding component is provided with an inner cladding middle thermocouple;
an inner cladding upper thermocouple is arranged on the inner wall of the upper one third of the length of the inner cladding assembly;
four, ring-shaped simulation core block
The annular simulation core block is a tubular structural member;
fifthly, the air inlet connecting pipe assembly comprises an air loop connecting pipe, a test piece connecting pipe, a square air inlet connecting block and an air inlet transition joint;
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 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, and the pressure-bearing range of a welding seam is 10-15 MPa;
the test piece connecting pipe is connected with the upper transition joint through the square air inlet connecting block;
the square air inlet connecting block is of a cuboid structure, a circular pore is formed in the middle of the square air inlet connecting block, a circular hole is formed in the side face of the square air inlet connecting block, and a test piece connecting pipe is inserted into the circular hole in the side face and is welded and connected to form an air inlet connecting pipe assembly;
the top of the air inlet connecting pipe assembly is connected with the upper transition joint in a welding manner, and the bottom of the air inlet connecting pipe assembly is connected with the air inlet transition joint in a welding manner;
the bottom end of the air inlet transition joint is connected with the top end of the annular electric heating core body assembly;
the whole device is respectively provided with an upper transition joint, a square air inlet connecting block, an air inlet transition joint, an annular electric heating core body assembly and a lower transition joint which are coaxially arranged from top to bottom along the axial direction, a closed cavity is formed among the components, and an annular fuel simulation pellet is arranged in the cavity close to the annular fuel inner cladding.
2. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: the upper transition joint is made of S30408, is arranged at the upper end of the whole device, and has an inner diameter of 11mm and an outer diameter of 16 mm;
the lower transition joint is made of Zr-4 and is arranged at the lower end of the whole device, and the inner diameter of the lower transition joint is 10.4mm, and the outer diameter of the lower transition joint is 16 mm.
3. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: the upper transition joint and the lower transition joint are fixedly connected to the inner casing assembly through welding respectively, and the pressure-bearing range of a welding seam is 10-15 MPa.
4. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: the double electric heating wire core body is integrally of an annular structure with the length of 800-1000mm, the inner diameter of 13mm and the outer diameter of 25 mm; wherein the length of the effective heating section is 600mm and is positioned in the middle of the whole electric heating core body; the outer surface of the double electric heating wire core is smooth, and the roughness is 1.6 um;
the material of each electric heating wire is nickel-cadmium electric heating alloy, the material brand is Cr20Ni80, the diameter is 0.7mm, the maximum using temperature is 1100-1200 ℃, the thread pitch is 1.45mm, the heating efficiency is more than 95 percent, and the adjustable electric heating maximum power is 10 kW/m.
5. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: the inner shroud component is a tubular structure with a length of 690mm, an outer diameter of 9.34mm and a thickness of 0.57 mm.
6. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: in the inner envelope component, the thermocouple in the middle of the inner envelope and the thermocouple on the upper part of the inner envelope are fixed on the inner wall of the inner envelope component 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 test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: the annular dummy pellets were tubular structures of alumina material with an inner diameter of 10.34mm and an outer diameter of 12.34 mm.
8. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in 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, a circular hole with the diameter of 6.2mm is formed in the side face of the square air inlet connecting block, a test piece connecting pipe with the diameter of 6mm is inserted into the circular hole in the.
9. The test device for bulging and blasting of the inner cladding of the pressure-bearing annular fuel rod as claimed in claim 1, wherein: the upper transition joint is made of S30408, is arranged at the upper end of the whole device, and has an inner diameter of 11mm and an outer diameter of 16 mm;
the lower transition joint is made of Zr-4 and is arranged at the lower end of the whole device, the inner diameter is 10.4mm, and the outer diameter is 16 mm;
the upper transition joint and the lower transition joint are fixedly connected to the inner envelope component through welding respectively, and the pressure-bearing range of a welding seam is 10-15 MPa;
the double electric heating wire core body is integrally of an annular structure with the length of 800-1000mm, the inner diameter of 13mm and the outer diameter of 25 mm; wherein the length of the effective heating section is 600mm and is positioned in the middle of the whole electric heating core body; the outer surface of the double electric heating wire core is smooth, and the roughness is 1.6 um;
the material of each electric heating wire is nickel-cadmium electric heating alloy, the material brand is Cr20Ni80, the diameter is 0.7mm, the maximum use temperature is 1100-1200 ℃, the thread pitch is 1.45mm, the heating efficiency is more than 95 percent, and the adjustable electric heating maximum power is 10 kW/m;
the inner casing component is a tubular structure with the length of 690mm, the outer diameter of 9.34mm and the thickness of 0.57 mm;
in the inner packaging shell assembly, a thermocouple in the middle of the inner packaging shell and a thermocouple on the upper part of the inner packaging shell are fixed on the inner wall of the inner packaging shell assembly 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 annular simulation core block is a tubular structural member of alumina material with the inner diameter of 10.34mm and the outer diameter of 12.34 mm;
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, a circular hole with the diameter of 6.2mm is formed in the side face of the square air inlet connecting block, a test piece connecting pipe with the diameter of 6mm is inserted into the circular hole in the.
10. A method for testing bulging blasting of cladding in a pressure-bearing annular fuel rod is characterized by comprising the following steps: the method uses the bulging blasting test device for the inner cladding of the pressure-bearing annular fuel rod as claimed in claims 1-9; the reactor 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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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010448600.XA CN111477369A (en) | 2020-05-25 | 2020-05-25 | Test device for bulging and blasting of cladding in pressure-bearing annular fuel rod |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010448600.XA CN111477369A (en) | 2020-05-25 | 2020-05-25 | Test device for bulging and blasting of cladding in pressure-bearing annular fuel rod |
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| CN111477369A true CN111477369A (en) | 2020-07-31 |
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| CN202010448600.XA Pending CN111477369A (en) | 2020-05-25 | 2020-05-25 | Test device for bulging and blasting of cladding in pressure-bearing annular fuel rod |
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2020
- 2020-05-25 CN CN202010448600.XA patent/CN111477369A/en active Pending
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