CN115132378A - ODS (oxide dispersion strengthened) stainless steel-based dispersion micro-packaging rod-shaped fuel element and reactor - Google Patents
ODS (oxide dispersion strengthened) stainless steel-based dispersion micro-packaging rod-shaped fuel element and reactor Download PDFInfo
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- CN115132378A CN115132378A CN202210799511.9A CN202210799511A CN115132378A CN 115132378 A CN115132378 A CN 115132378A CN 202210799511 A CN202210799511 A CN 202210799511A CN 115132378 A CN115132378 A CN 115132378A
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- 239000000446 fuel Substances 0.000 title claims abstract description 142
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 42
- 239000010935 stainless steel Substances 0.000 title claims abstract description 40
- 239000006185 dispersion Substances 0.000 title claims description 14
- 238000009462 micro packaging Methods 0.000 title abstract description 7
- 229910001175 oxide dispersion-strengthened alloy Inorganic materials 0.000 title description 28
- 239000002245 particle Substances 0.000 claims abstract description 35
- 238000005253 cladding Methods 0.000 claims abstract description 26
- 239000000758 substrate Substances 0.000 claims abstract description 13
- 239000011248 coating agent Substances 0.000 claims abstract description 11
- 238000000576 coating method Methods 0.000 claims abstract description 11
- 239000002296 pyrolytic carbon Substances 0.000 claims description 51
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 13
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 7
- 229910001105 martensitic stainless steel Inorganic materials 0.000 claims description 2
- 230000003993 interaction Effects 0.000 abstract description 5
- 230000004992 fission Effects 0.000 abstract description 4
- 230000008961 swelling Effects 0.000 abstract description 4
- 239000011159 matrix material Substances 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 241000013033 Triso Species 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 229910000734 martensite Inorganic materials 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910000859 α-Fe Inorganic materials 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000008188 pellet Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
- G21C3/60—Metallic fuel; Intermetallic dispersions
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/045—Pellets
- G21C3/047—Pellet-clad interaction
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/02—Fuel elements
- G21C3/04—Constructional details
- G21C3/045—Pellets
- G21C3/048—Shape of pellets
-
- 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
Abstract
The invention discloses a dispersed micro-packaging rod-shaped fuel element adopting ODS stainless steel base and a reactor, comprising a substrate and fuel particles with multiple coating structures, wherein a plurality of fuel cavities for containing the fuel particles with the multiple coating structures are arranged in the substrate, and the fuel particles with the multiple coating structures are arranged in the fuel cavities; the multiple-clad fuel particle includes: a fuel core and a fuel-free layer coated outside the fuel core; according to the invention, a plurality of fuel particles with multiple reporting structures are arranged in the fuel cavity in the substrate, so that no cladding of a fuel element is omitted, the mechanical interaction of pellet-cladding is avoided, the structure is simple, the space of a reactor core can be saved, heat transfer gaps are reduced, the fuel operation temperature is effectively reduced, the capacity of containing fission products is strong, the macroscopic irradiation swelling capacity is low, the high-temperature failure resistance is strong, the safety is high, and the fuel particle is suitable for the requirements of a high-temperature reactor on the miniaturization of the reactor core and the high-temperature inherent safety.
Description
Technical Field
The invention relates to the field of design of nuclear reactor fuel elements, in particular to a dispersion micro-packaging rod-shaped fuel element adopting ODS stainless steel base and a reactor.
Background
The heat pipe reactor is different from the common reactors such as a pressurized water reactor and the like: the heat pipe is used for conducting the heat of the reactor core to the solid-state reactor of the two loops or the thermoelectric conversion device in the first loop without adopting a coolant loop arrangement mode. The heat pipe reactor is usually designed by adopting a solid reactor core, the system design is relatively simple, the space requirement is compact, the intrinsic safety is high, the system equipment is simple and reliable, the operating characteristic is simple, the modularization is easy to expand, and the like, and the heat pipe reactor has good application prospects in the fields of deep space exploration and space power supply, deep space/low orbit propulsion power, celestial surface energy supply, land emergency power supply and the like. In order to meet the application requirements and improve the heat transfer efficiency and the operating time of the reactor core, the heat pipe reactor is required to be under extreme conditions of high temperature, strong irradiation and the like for a long time, which has very strict requirements on fuel elements in the reactor core.
In the traditional fuel core + cladding structure, in the fuel combustion process, mechanical interaction force exists between the pellets and the cladding, heat transfer gaps exist between reactor cores, the heat transfer efficiency is low, the fuel operation temperature is high, the capacity of containing fission products is poor, the macroscopic irradiation swelling capacity is high, the high-temperature failure resistance is weak, and the fuel core + cladding structure is not suitable for the requirements of a high-temperature reactor on the miniaturization of the reactor core and the safety of the high-temperature high-solid reactor.
The traditional M3 fuel adopts zirconium alloy as a base material to meet the application requirement of a pressurized water reactor, but because the operating temperature of a high-temperature reactor is higher, the zirconium alloy can not meet the requirement, and the base material with better performance at high temperature needs to be selected.
Disclosure of Invention
The invention aims to solve the technical problems that the traditional combination of cladding and fuel pellet has mechanical interaction force and low heat transfer performance, and aims to provide a dispersed micro-packaging rod-shaped fuel element and a reactor adopting ODS stainless steel base, which solve the problems of miniaturization of reactor core and safety of high-temperature high-solid reactor by high-temperature reactor.
The invention is realized by the following technical scheme:
an ODS stainless steel-based dispersion microencapsulated rod fuel element comprising: the fuel particle coating device comprises a substrate and multiple cladding structure fuel particles, wherein a plurality of fuel cavities for containing the multiple cladding structure fuel particles are arranged in the substrate, and the multiple cladding structure fuel particles are arranged in the fuel cavities;
the multiple-clad fuel particle includes:
a fuel core; and
a fuel-free layer coated outside the fuel core.
Specifically, the substrate comprises a fuel area and a fuel-free area;
the fuel-free area is of a cylindrical structure;
the fuel area is a columnar structure arranged in the fuel-free area, and the fuel cavities are arranged in the fuel area.
Specifically, the fuel area and the fuel-free area are integrally formed, the substrate is made of ODS stainless steel, and the ODS stainless steel is ODS ferritic stainless steel, ODS martensitic stainless steel or ODS-FeCrAl stainless steel.
Optionally, the upper end of the fuel-free area (12) is provided with a clamping end (3), and the lower end of the fuel-free area (12) is provided with a lower positioning section (4);
the clamping end (3) is used for moving fuel elements, and the lower positioning section (4) is matched with the lower reactor core plate;
the clamping device is characterized in that an upper positioning section is fixedly arranged at the upper end of the clamping end (3), a compression spring is sleeved on the upper positioning section, and the compression spring applies downward acting force to the clamping end (3).
Specifically, the fuel-free layer includes:
a loose pyrolytic carbon layer coated outside the fuel core;
an inner compact pyrolytic carbon layer coated outside the loose pyrolytic carbon layer;
the silicon carbide layer is coated on the outer side of the inner compact pyrolytic carbon layer; and
and the outer compact pyrolytic carbon layer is coated on the outer side of the silicon carbide layer.
Optionally, the fuel core is a spherical structure, and the loose pyrolytic carbon layer, the inner dense pyrolytic carbon layer, the silicon carbide layer and the outer dense pyrolytic carbon layer are all spherical shell structures.
Optionally, the fuel core is made of UO2 or UN;
the loose pyrolytic carbon layer is: a pyrolytic carbon layer having a density of 50% of theoretical density;
the inner/outer dense pyrolytic carbon layer is: a pyrolytic carbon layer having a density of 90% of theoretical density;
the theoretical density is 2.2g/cm 3.
Optionally, the diameter of the multiple-clad fuel particle is equal to the inner diameter of the fuel cavity.
Specifically, the fuel-free layer and the fuel core are of a three-structure homodromous type or two-structure homodromous type cladding structure.
A reactor burning a dispersed microencapsulated rod-shaped fuel element as described above, which is based on ODS stainless steel.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the invention, a plurality of fuel particles with multiple reporting structures are arranged in the fuel cavity in the substrate, so that no cladding of a fuel element is omitted, the mechanical interaction of pellet-cladding is avoided, the structure is simple, the space of a reactor core can be saved, heat transfer gaps are reduced, the fuel operation temperature is effectively reduced, the capacity of containing fission products is strong, the macroscopic irradiation swelling capacity is low, the high-temperature failure resistance is strong, the safety is high, and the fuel particle is suitable for the requirements of a high-temperature reactor on the miniaturization of the reactor core and the high-temperature inherent safety;
the ODS stainless steel is used as a metal matrix, and ferrite, martensite and FeCrAl stainless steel after oxide strengthening (ODS) has good high-temperature mechanical properties, and simultaneously retains excellent anti-irradiation performance, so that the ODS stainless steel is suitable for novel heat pipe reactors and other high-temperature reactors running at high temperature.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic view showing the structure of a dispersed microencapsulated rod fuel element made of ODS stainless steel according to the present invention.
Fig. 2 is a schematic structural view of a fuel particle having a multiple coating structure according to the present invention.
Reference numerals: 1-substrate, 2-fuel particles with multiple coating structures, 3-clamping end, 4-lower positioning section, 5-upper positioning section and 6-compression spring;
11-fuel zone, 12-no fuel zone, 21-fuel core, 22-no fuel layer, 221-loose pyrolytic carbon layer, 222-inner dense pyrolytic carbon layer, 223-silicon carbide layer, 224-outer dense pyrolytic carbon layer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant disclosure and are not to be considered as limiting.
It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and encompass, for example, both fixed and removable connections or integral parts thereof; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact of the first and second features, or may comprise contact of the first and second features not directly but through another feature in between. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. "beneath," "under" and "beneath" a first feature includes the first feature being directly beneath and obliquely beneath the second feature, or simply indicating that the first feature is at a lesser elevation than the second feature.
In the present invention, the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The embodiment provides a design scheme of a bar-shaped fuel element adopting ODS stainless steel base dispersion micro-packaging aiming at application requirements of high temperature, high radiation and reactor core miniaturization of a high-temperature reactor, so as to save reactor core space, reduce fuel operation temperature, resist high temperature, improve reactor core operation safety and prolong operation life.
A dispersed micro-packaging rod-shaped fuel element adopting ODS stainless steel base comprises a base body 1 and multiple cladding structure fuel particles 2, wherein a plurality of fuel cavities for containing the multiple cladding structure fuel particles 2 are formed in the base body 1, and the multiple cladding structure fuel particles 2 are arranged in the fuel cavities.
In the manufacturing of the fuel element, the fuel particles 2 with the multiple coating structures are uniformly dispersed in the rod-shaped fuel element in the ODS stainless steel matrix 1 as much as possible without cladding, so that the interaction of pellet-cladding mechanics is avoided, the reactor core space can be saved, the heat transfer gap is reduced, the fuel operation temperature is effectively reduced, the capacity of containing fission products is high, the macroscopic irradiation swelling capacity is low, and the high-temperature failure resistance is high.
Meanwhile, the multiple cladding structure fuel particle 2 in the present embodiment includes: a fuel core 21 and a fuel-free layer 22 covering the outside of the fuel core 21.
The core size, the thickness of each layer and the number of the fuel particles 2 with the multiple cladding structure required in one fuel element are all determined according to actual requirements.
And for better combustion effect, the fuel particles 2 with multiple coating structures are uniformly dispersed in the ODS stainless steel matrix 1 in the present embodiment.
The substrate 1 comprises a fuel area 11 and a fuel-free area 12, and the material of the substrate 1 is ODS stainless steel. The ODS stainless steel comprises, but is not limited to, oxide-reinforced stainless steel such as ODS ferrite stainless steel, ODS martensite stainless steel, ODS-FeCrAl stainless steel and the like, and the oxide-reinforced (ODS) ferrite, martensite and FeCrAl stainless steel have good high-temperature mechanical properties, and simultaneously retain excellent anti-irradiation performance, and are suitable for high-temperature reactors such as novel heat pipe reactors and the like running at high temperature.
The ODS stainless steel is adopted as the matrix 1, so that the ODS stainless steel has good high-temperature strength, creep property and oxidation resistance, low density, low thermal expansion coefficient and good irradiation resistance, is beneficial to heat conduction of a reactor core, reduces the operating temperature of fuel elements and improves the structural strength of the reactor core.
The non-fuel area 12 is a tubular structure, which can be regarded as a tubular housing, the fuel-containing area 11 is a columnar structure arranged in the non-fuel area 12, and the fuel cavities are all arranged in the fuel-containing area 11, but in order to avoid the mechanical relative action between the fuel-containing area 11 and the non-fuel area 12, the fuel-containing area 11 and the non-fuel area 12 are integrally formed, that is, the non-fuel area 12 is set as a whole to avoid the relative action.
The upper end of the fuel-free area 12 is provided with a clamping end 3, and the lower end of the fuel-free area 12 is provided with a lower positioning section 4; the clamping ends 3 are used for moving fuel elements, and the lower positioning section 4 is matched with the lower core plate.
The upper end of the clamping end 3 is fixedly provided with an upper positioning section 5, the upper positioning section is sleeved with a compression spring 6, and the compression spring 6 exerts downward acting force on the clamping end 3.
The clamping section 3 is used for clamping and moving, the upper positioning section 5 and the lower positioning section 4 are used for assembling and positioning the fuel elements in the reactor core, and the compression spring 6 is used for adjusting the deformation difference between the fuel elements and the lower reactor core plate caused by inconsistent thermal expansion and the like.
The fuel particle 2 of the multi-clad structure is composed of a fuel core, a loose pyrolytic carbon layer 221(Buffer), an inner dense pyrolytic carbon layer 222(IPyC), a silicon carbide layer 223(SiC), and an outer dense pyrolytic carbon layer 224(OPyC), respectively, from the inside to the outside. The thickness of each layer is determined according to actual requirements.
The fuel-free bed 22 includes:
a loose pyrolytic carbon layer 221 coated outside the fuel core 21;
an inner dense pyrolytic carbon layer 222 coated outside the loose pyrolytic carbon layer 221;
a silicon carbide layer 223 coated outside the inner dense pyrolytic carbon layer 222; and
an outer dense pyrolytic carbon layer 224 coated outside the silicon carbide layer 223.
The fuel particle 2 with the multi-coating structure may have various shapes, but for the convenience of manufacturing, the fuel core 21 in this embodiment has a spherical structure, and the loose pyrolytic carbon layer 221, the inner dense pyrolytic carbon layer 222, the silicon carbide layer 223, and the outer dense pyrolytic carbon layer 224 are all spherical shell structures.
And the diameter of the fuel particles 2 with the multiple cladding structure is equal to the inner diameter of the fuel cavity, so that the fuel particles 2 with the multiple cladding structure are stabilized in the combustion cavity, and the relative mechanical action between the fuel particles 2 with the multiple cladding structure and the matrix 1 is avoided.
Meanwhile, the material of the fuel particle 2 having a multiple coating structure will be briefly described.
The material of the fuel core 21 is UO2 or UN;
the loose pyrolytic carbon layer (221) is: the higher porosity pyrolytic carbon layer is typically about 50% of its theoretical density (2.2g/cm 3).
The inner dense pyrolytic carbon layer (222)/the outer dense pyrolytic carbon layer (224) is: relatively dense pyrolytic carbons, typically about 90% of their theoretical density (2.2g/cm3), have an average density of about 1.9g/cm 3.
The fuel-free layer 22 and the fuel core 21 are of a three-structure homodromous (TRISO) or two-structure homodromous (BISO) clad structure.
The BISO type means that loose pyrolytic carbon and dense pyrolytic carbon are sequentially deposited on the outer periphery 22 of the fuel core 21.
The TRISO type means that the outer circumference 22 of the fuel core 21 is sequentially deposited with loose pyrolytic carbon, dense pyrolytic carbon, and also with a silicon carbide layer and a dense pyrolytic carbon layer, and thus the dense pyrolytic carbon in the TRISO type is also referred to as an inner dense pyrolytic carbon layer 222 and an outer dense pyrolytic carbon layer 224.
In another aspect, the present embodiment also includes a reactor for combusting a dispersed microencapsulated rod fuel element, such as described above, using an ODS stainless steel base.
The combustion is realized by clamping the clamping end 3 and inserting the lower positioning section 4 into the lower core plate of the reactor. Need not to reserve air cavity, spacing spring etc. simple structure saves reactor core space, is convenient for arrange, adopts pressure spring 6 to be used for adjusting the deformation difference that produces because of thermal expansion nonconformity etc. between fuel element and the reactor core board at fuel element's one end.
In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of description and are not intended to limit the scope of the invention. It will be apparent to those skilled in the art that other variations or modifications may be made on the above invention and still be within the scope of the invention.
Claims (10)
1. An ODS stainless steel-based dispersion microencapsulated rod fuel element, comprising: the fuel particle coating device comprises a base body (1) and multiple cladding structure fuel particles (2), wherein a plurality of fuel cavities for containing the multiple cladding structure fuel particles (2) are arranged in the base body (1), and the multiple cladding structure fuel particles (2) are arranged in the fuel cavities;
the multiple-clad fuel particle (2) includes:
a fuel core (21); and
a fuel-free layer (22) surrounding the outside of the fuel core (21).
2. The ODS stainless steel-based dispersion microencapsulated rod fuel element as defined in claim 1 wherein the substrate (1) comprises a fuel-containing region (11) and a fuel-free region (12);
the fuel-free zone (12) is of a cylindrical structure;
the fuel area (11) is a columnar structure arranged in the fuel-free area (12), and the fuel cavities are arranged in the fuel area (11).
3. The ODS stainless steel-based dispersion micro-encapsulated rod-shaped fuel element according to claim 2, characterized in that the fueled zone (11) and the non-fueled zone (12) are integrally formed, and the material of the substrate (1) is ODS stainless steel, which is ODS ferritic stainless steel, ODS martensitic stainless steel or ODS-FeCrAl stainless steel.
4. The ODS stainless steel-based dispersion micro packaged rod fuel element according to claim 2, wherein said fuel free region (12) is provided at an upper end thereof with a holding end (3), and said fuel free region (12) is provided at a lower end thereof with a lower positioning section (4);
the clamping end (3) is used for moving fuel elements, and the conical end (4) is matched with the lower core plate;
the upper end of the clamping end (3) is fixedly provided with an upper positioning section (5), the upper positioning section is sleeved with a compression spring (6), and the compression spring (6) applies downward acting force to the clamping end (3).
5. An ODS stainless steel based dispersion microencapsulated rod fuel element as claimed in claim 1, wherein the fuel-free layer (22) comprises:
a loose pyrolytic carbon layer (221) coated outside the fuel core (21);
an inner dense pyrolytic carbon layer (222) coated outside the loose pyrolytic carbon layer (221);
a silicon carbide layer (223) coated outside the inner dense pyrolytic carbon layer (222); and
and an outer dense pyrolytic carbon layer (224) coated outside the silicon carbide layer (223).
6. The ODS stainless steel-based dispersion microencapsulated rod-shaped fuel element according to claim 5, wherein the fuel core (21) has a spherical structure, and the loose pyrolytic carbon layer (221), the inner dense pyrolytic carbon layer (222), the silicon carbide layer (223), and the outer dense pyrolytic carbon layer (224) are all spherical shell structures.
7. The ODS stainless steel-based dispersion micro-encapsulated rod fuel element according to claim 5, characterized in that the material of the fuel core (21) is UO 2 Or UN;
the loose pyrolytic carbon layer (221) is: a pyrolytic carbon layer having a density of 50% of theoretical density;
the inner/outer dense pyrolytic carbon layer (222/224) is: a pyrolytic carbon layer having a density of 90% of theoretical density;
the theoretical density is 2.2g/cm 3.
8. The ODS stainless steel-based dispersion microencapsulated rod fuel element as claimed in claim 5, wherein the diameter of the fuel particles (2) of the multiple cladding structure is equal to the inner diameter of the fuel cavity.
9. The ODS stainless steel-based dispersion microencapsulated rod fuel element according to claim 1, wherein the fuel-free layer (22) and the fuel core (21) have a three-structure homodromous or two-structure homodromous clad structure.
10. A reactor, characterized in that a dispersed microencapsulated rod-shaped fuel element using ODS stainless steel as defined in any one of claims 1 to 9 is fired.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210799511.9A CN115132378A (en) | 2022-07-08 | 2022-07-08 | ODS (oxide dispersion strengthened) stainless steel-based dispersion micro-packaging rod-shaped fuel element and reactor |
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| CN202210799511.9A CN115132378A (en) | 2022-07-08 | 2022-07-08 | ODS (oxide dispersion strengthened) stainless steel-based dispersion micro-packaging rod-shaped fuel element and reactor |
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| CN105469838A (en) * | 2015-12-23 | 2016-04-06 | 中广核研究院有限公司 | Fuel assembly and fuel rod capable of improving reactor security of fuel assembly |
| JP2017223478A (en) * | 2016-06-14 | 2017-12-21 | 株式会社グローバル・ニュークリア・フュエル・ジャパン | Fuel rod and fuel rod assembly |
| CN109994223A (en) * | 2017-12-29 | 2019-07-09 | 中国核动力研究设计院 | A kind of novel dispersion fuel and its manufacturing method |
| CN111341476A (en) * | 2018-12-19 | 2020-06-26 | 中核建中核燃料元件有限公司 | Device and method for rotary pressing positioning spring of nuclear fuel rod |
| CN109830308A (en) * | 2019-01-24 | 2019-05-31 | 中广核研究院有限公司 | Fuel assembly with segmented fuel rod |
| CN110379525A (en) * | 2019-08-02 | 2019-10-25 | 上海核工程研究设计院有限公司 | A kind of rodlike nuclear fuel element of crash-proof and preparation method thereof |
| CN110863152A (en) * | 2019-12-05 | 2020-03-06 | 中国核动力研究设计院 | Preparation method of FeCrAl-based ODS alloy for nuclear reactor accident-resistant fuel element cladding |
| CN112233820A (en) * | 2020-10-15 | 2021-01-15 | 哈尔滨工程大学 | Reactor fuel assembly and reactor core structure |
| CN114203314A (en) * | 2021-12-06 | 2022-03-18 | 西安交通大学 | Composite silicon carbide clad nuclear fuel rod with gap filled with liquid metal |
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