CN109595428B - Single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipeline - Google Patents
Single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipeline Download PDFInfo
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- CN109595428B CN109595428B CN201811473773.6A CN201811473773A CN109595428B CN 109595428 B CN109595428 B CN 109595428B CN 201811473773 A CN201811473773 A CN 201811473773A CN 109595428 B CN109595428 B CN 109595428B
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/02—Shape or form of insulating materials, with or without coverings integral with the insulating materials
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L59/00—Thermal insulation in general
- F16L59/08—Means for preventing radiation, e.g. with metal foil
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/08—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation
- G21C11/086—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation consisting of a combination of non-metallic and metallic layers, e.g. metal-sand-metal-concrete
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/08—Vessels characterised by the material; Selection of materials for pressure vessels
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F1/00—Shielding characterised by the composition of the materials
- G21F1/12—Laminated shielding materials
- G21F1/125—Laminated shielding materials comprising metals
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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
Abstract
The invention discloses a single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipelines, which comprises a heat-insulating outer box, and a neutron shielding layer, a gamma shielding layer and a metal reflecting foil which are filled in the heat-insulating outer box, wherein the neutron shielding layer and the gamma shielding layer are both made of inorganic shielding materials with metal characteristics; the filling sequence on the thickness section of the heat preservation layer is as follows in sequence: the inner shell plate, the neutron shielding layer, the gamma shielding layer, the metal reflecting foil and the outer shell plate of the heat-preservation outer box are arranged on the heat-preservation outer box; the metal reflecting foils are in the shape of positive and negative conical boss waves which are distributed at intervals in a longitudinal and transverse regular mode, and two adjacent layers of metal reflecting foils are stacked in a back-to-back staggered mode in a mode that the vertexes of the positive and negative conical bosses are opposite to the vertexes of the positive and negative conical bosses. The composite metal heat-insulating layer not only has the heat-insulating function, but also has the screen radiation shielding function, can be used in a high-temperature radiation environment for a long time without replacement, and meets the requirements of nuclear-grade equipment and pipeline heat-insulating layers.
Description
Technical Field
The invention relates to the technical field of nuclear industry, in particular to a single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipelines.
Background
When a nuclear reactor normally operates, high-temperature, high-pressure and high-radioactivity cooling media flow in primary nuclear equipment and a pipeline, heat insulation layers are required to be arranged on the outer surfaces of the primary nuclear equipment and the pipeline for heat insulation, so that heat loss is reduced, meanwhile, shielding materials are required to be arranged outside the primary nuclear equipment and the pipeline for reducing radiation dose of the periphery of the equipment, and the nuclear reactor is beneficial to inspection and maintenance of personnel in service. At present, the metal heat-insulating layer is usually adopted outside primary equipment and a pipeline of a nuclear reactor coolant system, but the metal heat-insulating layer only has the heat-insulating function and does not have the shielding function, for example: the metal heat-insulating layers provided by the patents US3904379A, CN1159062A and CN203131332U do not have the shielding function. However, with the development of nuclear power technology, the demand for nuclear-grade equipment and pipeline insulating layers with heat preservation and insulation functions and shielding functions is more obvious, patents CN103174912B and CN103971761A each provide a composite insulating layer with shielding function, but both shielding materials use non-metallic organic materials such as boron-containing silicone resin, boron-containing polyethylene plate, boron-containing epoxy resin plate, and the like, the applicable temperature range of the non-metallic organic shielding materials is generally not higher than 200 ℃, even under the working environment lower than 200 ℃, due to the inherent characteristic limitation of the organic resin materials, the non-metallic organic shielding materials inevitably generate performance aging under high-temperature and long-time use, so that the shielding function of the non-metallic organic shielding materials is gradually reduced and even lost, the service life of the non-metallic organic shielding materials is not very long, when the non-metallic organic shielding materials are used in nuclear power plants and nuclear power equipment with long service lives (such as 60 years), it must be replaced regularly to ensure that its shielding performance is always satisfactory.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the invention provides a single-side filling shielding material insulating layer for nuclear-grade equipment and pipelines, which solves the problems that in the prior art, a composite metal insulating layer with a radiation shielding function is made of organic materials, has poor high-temperature resistance and short service life and needs to be replaced periodically.
The invention is realized by the following technical scheme:
a single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipelines comprises a heat-insulating outer box, and a neutron shielding layer, a gamma shielding layer and a metal reflecting foil which are filled in the heat-insulating outer box, wherein the neutron shielding layer and the gamma shielding layer are both made of inorganic shielding materials with metal characteristics; the filling sequence on the thickness section of the heat preservation layer is as follows in sequence: an inner shell plate, a neutron shielding layer, a gamma shielding layer, a plurality of layers of metal reflecting foils and an outer shell plate of the heat-preservation outer box; the metal reflecting foils are integrally arranged in a corrugated shape at intervals in a longitudinal and transverse regular mode by the forward conical bosses and the reverse conical bosses, and the adjacent two layers of metal reflecting foils are stacked in a back-to-back staggered mode from the vertexes of the forward conical bosses to the vertexes of the reverse conical bosses.
The heat-insulating outer box of the metal heat-insulating layer provided by the invention can be formed by making the inner shell plate face the outer wall of the heating equipment or making the outer shell plate face the outer wall of the heating equipment, and the overall appearance of the metal heat-insulating layer can be made into a flat plate shape, a round tube shape or a spherical surface shape according to the shape of the surface of the equipment. The filling layer number of the metal reflecting foils is determined according to the heat preservation requirement of the heating equipment, and the distance between two adjacent layers of the metal reflecting foils can be adjusted by controlling the height of the conical boss, so that the optimization of the filling layer number of the metal reflecting foils and the heat preservation and insulation effect is achieved. When two adjacent layers of metal reflecting foils are filled, the vertex contact of the forward conical boss and the vertex-to-vertex back-to-back staggered stacking of the reverse conical boss are required, the contact between the two adjacent layers of metal reflecting foils is all point contact, and the purpose is to reduce the metal contact area and reduce the metal contact heat conduction loss.
Furthermore, a partition plate is arranged between the gamma shielding layer and the metal reflecting foil, the partition plate divides the heat-insulating outer box into two independent chambers, and the partition plate is made of double-mirror austenitic stainless steel sheets.
The partition plate is made of double-mirror austenitic stainless steel thin plates, and is in intermittent welding connection with the shell plates on the side faces around the heat-preservation outer box, so that the neutron shielding layer, the gamma shielding layer and the metal reflecting foil are separated, and the neutron shielding layer, the gamma shielding layer and the metal reflecting foil are separated into two independent cavities in the heat-preservation outer box.
Furthermore, the heat-preservation outer box is a closed outer box formed by welding an inner shell plate, an outer shell plate and peripheral side shell plates, wherein the inner shell plate, the outer shell plate and the peripheral side shell plates are all made of double-mirror-surface austenitic stainless steel thin plates.
Further, the austenitic stainless steel sheet has a Co content of 1% by mass or less to minimize the level of an activator dose after being subjected to neutron and gamma irradiation.
Furthermore, the neutron shielding layer is made of nuclear pure-grade boron carbide sintered blocks or aluminum-based boron carbide composite plates.
Furthermore, the neutron shielding layer is formed by alternately stacking a plurality of layers of boron carbide sintered blocks or a plurality of layers of aluminum-based boron carbide composite plates, and splicing seams of two adjacent layers of boron carbide sintered blocks or aluminum-based boron carbide composite plates are staggered with each other.
The total thickness of the neutron shielding layer is determined according to the radiation shielding requirement, and the requirement of the total thickness can be met by alternately stacking a plurality of layers of boron sintered blocks or aluminum-based boron carbide composite plates.
Further, the gamma shielding layer is made of a lead plate or a tungsten alloy plate.
Furthermore, the metal reflecting foil is made into a positive and negative conical boss corrugated shape which is arranged at regular intervals in a longitudinal and transverse direction by adopting an ultrathin austenitic stainless steel foil belt.
Further, the ultrathin austenitic stainless steel foil strip is prepared through solution annealing and double-sided brightness treatment, and the mass percentage of Co is less than or equal to 1%.
The ultra-thin austenitic stainless steel foil strip used for pressing the metal reflective foil should be solution annealed, double-side brightly treated, and Co content controlled at a level not greater than 1%, for the purpose of: 1) the plasticity and toughness of the stainless steel foil strip are enhanced to prevent the stainless steel foil strip from being torn during press forming; 2) the surface smoothness of the stainless steel foil strip is improved to reduce the surface emissivity of the foil strip and enhance the radiation reflection capability of the metal reflection foil to heat; 3) the activation dose level after neutron and gamma irradiation is minimized.
The invention has the following advantages and beneficial effects:
1. the metal heat-insulating layer provided by the invention is characterized in that a neutron and gamma shielding layer is added in the structure of the existing metal heat-insulating layer, so that the excellent heat-insulating function of the metal heat-insulating layer is kept, the radiation shielding function of shielding neutrons and gamma rays is newly increased, the neutron shielding layer adopts a nuclear pure-grade boron carbide sintered block or an aluminum-based boron carbide composite plate, the gamma shielding layer adopts a lead plate or a tungsten alloy plate, the four shielding materials are all inorganic shielding materials with metal characteristics, are stable in high temperature resistance, radiation resistance and chemical and physical properties, can be used in a high-temperature and high-radiation environment for a long life without aging and shielding performance reduction, do not need to be replaced regularly, and well overcome the defects that the non-metal organic shielding materials used in patents CN103174912B and CN103971761A are not high in temperature resistance, are easy to age and need to be replaced regularly;
2. the corrugated structure of the single-layer metal reflecting foil and the stacking structure of the multiple layers of metal reflecting foils filled in the metal heat-insulating layer can effectively reduce the radiation heat transfer quantity and the metal contact heat conduction heat transfer quantity, and improve the heat-insulating effect of the composite metal heat-insulating layer. In addition, the positive and negative conical boss corrugated structures on the metal reflecting foil are regularly arranged at intervals in the longitudinal and transverse directions on the whole plane, are uniformly distributed in all directions, can be extremely conveniently rolled into a circular tube shape or a spherical shape without distinguishing the corrugated directions, and can conveniently make the whole appearance of the whole composite metal heat-insulating layer into a circular tube shape or a spherical shape according to the surface shape of equipment.
In conclusion, the composite metal heat-insulating layer provided by the invention has excellent heat-insulating property and excellent radiation-proof function for shielding neutrons and gamma rays, can be used in high-temperature and high-irradiation environments for a long time without aging and shielding performance reduction, does not need to be replaced periodically, and can be used for constructing a metal heat-insulating layer system of nuclear primary equipment and pipelines.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention. In the drawings:
FIG. 1 is a schematic structural view of a composite functional metal insulating layer filled with a shielding material on one side of the present invention;
FIG. 2 is a plan top view of the metal reflective foil of FIG. 1;
fig. 3 is a cross-sectional structure a-a of the metal reflective foil of fig. 2.
Reference numbers and corresponding part names in the drawings: 1-inner shell plate, 2-outer shell plate, 3-side shell plate, 4-neutron shielding layer, 5-gamma shielding layer, 6-partition plate, 7-metal reflecting foil, 8-forward conical boss and 9-reverse conical boss.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Example 1
As shown in figure 1, the metal heat-insulating layer provided by the invention comprises a heat-insulating outer box, and a neutron shielding layer 4, a gamma shielding layer 5, a partition plate 6 and a metal reflecting foil 7 which are filled in the heat-insulating outer box, wherein the filling sequence of the parts on the thickness section is as follows: the inner shell plate 1 of the heat-preservation outer box, the neutron shielding layer 4, the gamma shielding layer 5, the partition plate 6, the multilayer metal reflection foil 7 and the outer shell plate 2 of the heat-preservation outer box can be the inner shell plate 1 facing to the outer wall of the heating equipment or the outer shell plate 2 facing to the outer wall of the heating equipment. The overall appearance of the composite metal heat-insulating layer with the shielding function can be made into a flat plate shape, a round tube shape or a spherical surface shape according to the shape of the surface of equipment. The high temperature range can be up to 450 ℃, the heat preservation performance can be realized to have an equivalent thermal conductivity coefficient less than 0.075W/(m.K), and the service life can be expected to be 60 years or even longer.
The heat preservation outer box is a closed outer box formed by welding an inner shell plate 1, an outer shell plate 2 and peripheral side shell plates 3 in a spot welding or intermittent welding mode, the material is made of an austenitic stainless steel thin plate, double-side polishing needs to be carried out on the austenitic stainless steel thin plate to meet the requirement of double mirror surfaces, and the content of Co in the austenitic stainless steel thin plate is controlled to be not more than 1% so as to reduce the level of an activating agent after being subjected to neutron and gamma irradiation as much as possible. The thickness of the inner shell plate 1 and the outer shell plate 2 is generally between 0.6mm and 1.0mm, while the thickness of the side shell plate 3 may be equal to the thickness of the inner shell plate 1 or the thickness of the outer shell plate 2, but considering that the structural strength of the heat preservation box may also be slightly thicker than the thickness of the inner shell plate 1 and the thickness of the outer shell plate 2, but generally not more than 2mm, in order to further enhance the strength of the heat preservation box, the side shell plate may be pressed inward along the thickness direction of the heat preservation box with the thickness of the side shell plate 3 being kept unchanged to form equally spaced triangular grooves or semi-cylindrical grooves, so as to increase the bending section modulus of the side shell plate, thereby improving the overall structural rigidity and strength of the heat preservation box.
The neutron shielding layer 4 adopts nuclear pure grade boron carbide sintered blocks or aluminum-based boron carbide composite plates, the total thickness of the neutron shielding layer is determined according to the radiation shielding requirement, and multiple layers of boron carbide sintered blocks or multiple layers of aluminum-based boron carbide composite plates can be staggered and stacked to meet the requirement of the total thickness. The relative density of the boron carbide sintered block is generally controlled within the range of 60-85%, and the content of boron carbide in the aluminum-based boron carbide composite plate is generally about 30%. The splicing seams of two adjacent layers of boron carbide sintered blocks or aluminum-based boron carbide composite boards are staggered with each other, so that labyrinth staggered and stacked seams are formed in the thickness direction, straight seam splicing in the thickness direction is avoided, and neutron beam leakage is avoided.
The gamma shielding layer 5 is made of a lead plate or a tungsten alloy plate, the lead plate is adopted when the working temperature is lower than 327 ℃, the tungsten alloy plate is adopted when the working temperature is higher than 327 ℃, and the thickness of the gamma shielding layer 5 is determined according to the radiation shielding requirement.
The partition plate 6 is made of double-mirror austenitic stainless steel sheets made of the same material as the heat-insulating outer box, the partition plate 6 is in welded connection with the shell plates 3 on the peripheral side faces of the heat-insulating outer box, and the neutron shielding layer 4, the gamma shielding layer 5 and the metal reflecting foil 7 are separated to form two independent cavities in the heat-insulating outer box and used for respectively filling the shielding layer and the metal reflecting foil 7.
The metal reflecting foil 7 is made of an ultrathin austenitic stainless steel foil strip, the thickness of the metal reflecting foil is generally 0.05 mm-0.1 mm, the metal reflecting foil is pressed into a positive and negative conical boss corrugated shape which is shown in fig. 2 and fig. 3 and is arranged at regular intervals in a longitudinal and transverse mode, the top diameter of the positive and negative conical boss is generally 5 mm-10 mm, the bottom diameter is generally 20 mm-60 mm, and the height of the positive and negative conical boss is generally 5 mm-15 mm, preferably 5-10 mm; the spacing between adjacent positive and negative conical bosses is generally in the range of 60 mm-120 mm. The filling layer number of the metal reflecting foils 7 is determined according to the heat preservation requirement of the heating equipment, and the distance between two adjacent layers of the metal reflecting foils 7 can be adjusted by controlling the heights of the forward conical boss 8 and the reverse conical boss 9, so that the optimization of the filling layer number and the heat preservation and insulation effect of the metal reflecting foils 7 is achieved. When two adjacent layers of metal reflecting foils 7 are filled, the vertex of the forward conical boss 8 needs to be reversely staggered and stacked to the vertex of the reverse conical boss 9, so that all the contact between the two adjacent layers of metal reflecting foils 7 is point contact, the purpose is to reduce the metal contact area and the metal contact heat conduction loss. The ultra-thin austenitic stainless steel foil strip used for pressing the metal reflecting foil 7 should be subjected to solution annealing and double-side polishing treatment, and the Co content is controlled at a level of not more than 1%, for the purpose of: 1) the plasticity and toughness of the stainless steel foil strip are enhanced to prevent the stainless steel foil strip from being torn during press forming; 2) the surface smoothness of the stainless steel foil strip is improved to reduce the surface emissivity of the foil strip and enhance the radiation reflection capability of the metal reflection foil to heat; 3) the activation dose level after neutron and gamma irradiation is minimized.
In addition, the metal reflecting foil can also be pressed into the existing periodically-changed positive and negative triangular wave shape or chocolate wave shape, the depth and the corresponding distance parameter are set according to the content, and the pressed and formed metal reflecting foil can also achieve better heat preservation effect when being matched with the heat preservation outer box, the neutron shielding layer, the gamma shielding layer, the partition plate and other structures.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipelines is characterized by comprising a heat-insulating outer box, and a neutron shielding layer (4), a gamma shielding layer (5) and a metal reflecting foil (7) which are filled in the heat-insulating outer box, wherein the neutron shielding layer (4) and the gamma shielding layer (5) are both made of inorganic shielding materials with metal characteristics; the filling sequence on the thickness section of the heat preservation layer is as follows in sequence: an inner shell plate (1) of the heat-preservation outer box, a neutron shielding layer (4), a gamma shielding layer (5), a plurality of layers of metal reflecting foils (7) and an outer shell plate (2) of the heat-preservation outer box; the metal reflecting foils (7) are integrally arranged in a corrugated shape at regular intervals in a longitudinal and transverse direction by the forward conical bosses (8) and the reverse conical bosses (9), and the adjacent two layers of metal reflecting foils (7) are stacked in a back-to-back staggered manner from the vertex of the forward conical boss (9) to the vertex of the reverse conical boss (9);
each layer of metal reflecting foil (7) has the same structure, is in a corrugated shape formed by arranging forward conical bosses (8) and reverse conical bosses (9) at regular intervals, and is in equal-interval circulating distribution by taking one forward conical boss (8) and one reverse conical boss (9) as a circulating unit; the diameters of the forward conical boss (8) and the reverse conical boss (9) are equal; the two adjacent layers of metal reflecting foils (7) are stacked in a back-to-back staggered manner from the vertex of the forward conical boss (8) to the vertex of the reverse conical boss (9);
the top diameters of the forward conical boss (8) and the reverse conical boss (9) are both 5-10 mm, the bottom diameters of the forward conical boss (8) and the reverse conical boss (9) are both 20-60 mm, and the heights of the forward conical boss (8) and the reverse conical boss (9) are both 5-15 mm; set up according to spacing distance between adjacent forward circular cone boss (8) and reverse circular cone boss (9), just forward circular cone boss (8) is down followed and adjacent next reverse circular cone boss (9) is down followed spacing distance between the connection, reverse circular cone boss (9) is gone up along and is connected along spacing distance on the next adjacent forward circular cone boss, spacing distance is 60mm ~ 120 mm.
2. The single-side filling shielding material heat-insulating layer for the nuclear-grade equipment and pipelines is characterized in that a partition plate (6) is further arranged between the gamma shielding layer (5) and the metal reflecting foil (7), the partition plate (6) divides the heat-insulating outer box into two independent chambers, and the partition plate (6) is made of double-mirror austenitic stainless steel sheets.
3. The single-side-filled shielding material heat-insulating layer for nuclear-grade equipment and pipelines according to claim 1, wherein the heat-insulating outer box is a closed outer box formed by welding an inner shell plate (1), an outer shell plate (2) and peripheral side shell plates (3), and the inner shell plate (1), the outer shell plate (2) and the peripheral side shell plates (3) are all made of double-mirror austenitic stainless steel sheets.
4. The single-sided filled shielding material heat-insulating layer for the nuclear-grade equipment and pipelines as claimed in claim 3, wherein the austenitic stainless steel sheet has a Co content of less than or equal to 1% by mass.
5. The single-side filling shielding material heat-insulating layer for the nuclear-grade equipment and pipelines according to claim 1, wherein the neutron shielding layer (4) is made of nuclear pure-grade boron carbide sintered blocks or aluminum-based boron carbide composite plates.
6. The single-side filling shielding material heat-insulating layer for the nuclear-grade equipment and pipelines is characterized in that the neutron shielding layer (4) is formed by alternately stacking a plurality of layers of boron carbide sintered blocks or a plurality of layers of aluminum-based boron carbide composite plates, and splicing seams of two adjacent layers of boron carbide sintered blocks or aluminum-based boron carbide composite plates are staggered with each other.
7. The single-side filled shielding material heat insulation layer for the nuclear-grade equipment and the pipeline as claimed in claim 1, wherein the gamma shielding layer (5) is made of lead plates or tungsten alloy plates.
8. The single-side-filling shielding material heat-insulating layer for the nuclear-grade equipment and the pipeline as claimed in claim 1, wherein the metal reflecting foil (7) is made into a positive and negative conical boss corrugated shape arranged at regular intervals in a longitudinal and transverse direction by adopting an ultrathin austenitic stainless steel foil belt.
9. The single-sided filled shielding material heat-insulating layer for the nuclear-grade equipment and pipelines as claimed in claim 8, wherein the ultrathin austenitic stainless steel foil strip is prepared by solution annealing and double-sided bright treatment, and the mass percentage of Co is less than or equal to 1%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811473773.6A CN109595428B (en) | 2018-12-04 | 2018-12-04 | Single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipeline |
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| CN201811473773.6A CN109595428B (en) | 2018-12-04 | 2018-12-04 | Single-side filling shielding material heat-insulating layer for nuclear-grade equipment and pipeline |
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| CN109595428A CN109595428A (en) | 2019-04-09 |
| CN109595428B true CN109595428B (en) | 2021-08-24 |
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