CN108335767B - Horizontal device for spent fuel dry storage - Google Patents
Horizontal device for spent fuel dry storage Download PDFInfo
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- CN108335767B CN108335767B CN201810094575.2A CN201810094575A CN108335767B CN 108335767 B CN108335767 B CN 108335767B CN 201810094575 A CN201810094575 A CN 201810094575A CN 108335767 B CN108335767 B CN 108335767B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/02—Details of handling arrangements
- G21C19/06—Magazines for holding fuel elements or control elements
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/04—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from fissile or breeder material
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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
- G21F1/02—Selection of uniform shielding materials
- G21F1/04—Concretes; Other hydraulic hardening materials
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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
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention discloses a horizontal device for spent fuel dry-type storage, which comprises: the bottom of the base is provided with an air inlet; the bottom of the cylinder body is fixed on the base and comprises an inner shell cylinder body with a steel plate structure and an outer shell cylinder body with a steel plate structure, concrete is filled between the inner shell cylinder body and the outer shell cylinder body to form a sandwich layer structure of 'steel plate-concrete-steel plate', an air inlet air flow passage communicated with the air inlet is arranged at the bottom of the cylinder body, and an air outlet air flow passage is arranged at the top of the cylinder body; and the top seat is fixed at the top of the cylinder body, an air outlet is arranged on the top seat, and the air outlet is communicated with an air flow passage of the air outlet at the top of the cylinder body. Compared with the prior art, the horizontal device for the spent fuel dry-type storage is simple and convenient to build, simple in structure, safe, durable, good in ventilation and radiation shielding effects, convenient to operate and operate, and convenient to popularize and apply widely.
Description
Technical Field
The invention belongs to the field of dry storage of spent fuel in a nuclear power plant, and particularly relates to a horizontal device for dry storage of spent fuel.
Background
The horizontal device for dry-type storage of the spent fuel in the nuclear power plant is used as a fuel storage tank for storing and protecting a sealed spent fuel assembly, is mainly used for protecting and shielding the structure of the spent fuel storage tank and providing an air convection channel to fully cool the spent fuel storage tank. The horizontal device for the international widely used spent fuel dry storage is of a cuboid reinforced concrete structure with a hollow interior and can be divided into a square top seat, a concrete enclosing plate, an internal supporting guide rail and a detachable door opening cover plate. The square top seat and the concrete enclosing plate are of reinforced concrete structures and are used for providing a spent fuel storage tank structure and shielding protection. The spent fuel storage tank is freely located on the support guide rails on two sides of the interior and is free of any constraint. Simple air inlet and exhaust channels are arranged at the bottom and the top of the horizontal concrete module to continuously exhaust decay heat of the spent fuel assembly.
However, this structure has certain drawbacks:
1) the horizontal storage module is of a reinforced concrete structure, so that the construction difficulty is high;
2) the concrete is easy to crack and corrode when exposed, and the service life and the durability are insufficient;
3) the safety margin of the material in a local high-temperature area is extremely small due to insufficient ventilation and heat exchange capacity;
4) the radiation shielding capability of a module ventilation opening is poor, so that the radiation shielding safety of operation operators is influenced;
5) the spent fuel storage tank is in an unconstrained free storage state, and the anti-seismic safety performance is insufficient.
In view of the above, it is necessary to provide a horizontal device for dry-type spent fuel storage, which has the advantages of simple construction, simple structure, safety, durability, good ventilation and radiation shielding effects, and convenient operation.
Disclosure of Invention
The invention aims to: the defects of the prior art are overcome, and the horizontal device for the spent fuel dry storage is simple and convenient to construct, simple in structure, safe, durable, good in ventilation and radiation shielding effects and convenient to operate.
In order to achieve the above object, the present invention provides a horizontal apparatus for dry-type spent fuel storage, including:
the bottom of the base is provided with an air inlet;
the cylinder body is provided with a space for accommodating the spent fuel storage tank, the bottom of the cylinder body is fixed on the base and comprises an inner shell cylinder body with a steel plate structure and an outer shell cylinder body with a steel plate structure, concrete is filled between the inner shell cylinder body and the outer shell cylinder body to form a sandwich layer structure of 'steel plate-concrete-steel plate', the bottom of the cylinder body is provided with an air inlet air flow channel communicated with the air inlet, and the top of the cylinder body is provided with an air outlet air flow channel; and
the top seat is fixed at the top of the cylinder body, an air outlet is arranged on the top seat, and the air outlet is communicated with an air outlet air flow channel at the top of the cylinder body.
As an improvement of the horizontal device for the dry storage of the spent fuel, a plurality of support ring plate structures are arranged on the inner cavity of the inner shell barrel.
The horizontal device for the dry storage of the spent fuel comprises an annular ring plate, a guide angle plate and a support supporting plate, wherein the annular ring plate is fixedly connected with an inner shell barrel, the guide angle plate is fixedly connected with the annular ring plate, the middle part of the annular ring plate is a round hole for accommodating a spent fuel storage tank, and mutually independent ventilation flow channels without barriers are formed among the annular ring plates.
As an improvement of the horizontal device for dry storage of spent fuel, the guide angle plate is in a circular arc triangle shape or in a structure with rounded edges, the included angle between the two ends and the axis of the circular hole in the middle of the annular ring plate is 25-40 degrees, the support supporting plate is in a circular arc shape, the included angle between the two ends and the axis of the circular hole in the middle of the annular ring plate is 60-120 degrees, preferably, the guide angle plate is in a circular arc triangle shape, the included angle between the two ends and the axis of the circular hole in the middle of the annular ring plate is 30 degrees, the support supporting plate is in a circular arc shape, and the included angle between the two ends and the axis of the circular hole in the middle of.
As an improvement of the horizontal device for the dry storage of the spent fuel, the longitudinal section of the cylinder body is of a regular polygon structure, the longitudinal sections of the outer shell cylinder and the inner shell cylinder are of regular polygon structures consistent with the cylinder body, the inner shell cylinder and the outer shell cylinder are connected by welding through connecting rib plates, the connecting rib plates are positioned at the polygon edges of the outer shell cylinder and the inner shell cylinder, preferably, the longitudinal sections of the outer shell cylinder and the inner shell cylinder are of regular octagon structures, and the connecting rib plates are positioned at the octagon edges of the outer shell cylinder and the inner shell cylinder.
As an improvement of the horizontal device for the dry storage of the spent fuel, at least one air inlet hole is respectively arranged at the lower parts of the outer shell cylinder and the inner shell cylinder to form an air inlet air channel of the whole cylinder body, at least one air outlet hole is respectively arranged at the upper parts of the outer shell cylinder and the inner shell cylinder to form an air outlet air channel of the whole cylinder body, preferably, the front ends of the air outlet holes and the front ends of the air inlet holes keep a certain distance from the front edge of the cylinder body, and the rear ends of the air outlet holes and the rear ends of the air inlet holes are directly communicated to the rear edge of the cylinder body.
The base comprises a base plate and end heads positioned at two ends of the base plate, the base plate comprises a convex base plate and trapezoidal base plates distributed at two sides of the convex base plate, the convex base plate and the trapezoidal base plates are respectively and fixedly connected with the end heads at the two ends, a double-step L-shaped labyrinth air inlet in mirror symmetry is arranged between the convex base plate and the trapezoidal base plate, or a single-step L-shaped labyrinth air inlet is arranged between the convex base plate and the trapezoidal base plate.
The top seat comprises an air outlet base plate and end plates at two ends, the air outlet base plate comprises a convex upper base plate and L-shaped lower base plates symmetrically distributed at two sides of the convex upper base plate, the L-shaped lower base plates are positioned at the lower parts of the convex upper base plate, the convex upper base plate and the L-shaped lower base plates are respectively and fixedly connected with the end plates at two ends to form a double-step L-shaped labyrinth air outlet in mirror symmetry, or the convex upper base plate and the L-shaped lower base plates at two sides are respectively and fixedly connected with the end plates at two ends to form a single-step L-shaped labyrinth air outlet.
As an improvement of the horizontal device for the dry storage of the spent fuel, the barrel body further comprises door opening cover plates and a bottom cover, the door opening cover plates are arranged at two ends of the inner shell barrel and the outer shell barrel and comprise a left single door and a right single door, and the door opening cover plates are opened and closed by adopting a horizontal-pulling double-door structure design.
As an improvement of the horizontal device for the dry storage of the spent fuel, an upper sealing head is arranged between the door opening cover plate and the inner shell cylinder and between the door opening cover plate and the outer shell cylinder, and the door opening cover plate, the upper sealing head and the bottom cover are all regular polygon structures matched with the inner shell cylinder and the outer shell cylinder, preferably regular octagon structures.
As an improvement of the horizontal device for the dry storage of the spent fuel, the structure of the top seat, the base, the door opening cover plate and the bottom cover is one or a combination of a steel plate-concrete-steel plate sandwich layer structure, a full concrete structure or a reinforced concrete structure, and preferably, the top seat, the base, the door opening cover plate and the bottom cover are all steel plate-concrete-steel plate sandwich layer structures.
As an improvement of the horizontal device for the dry storage of the spent fuel, the left single door and the right single door are respectively and movably connected with the upper end enclosure through door shafts.
As an improvement of the horizontal device for the dry type storage of the spent fuel, the left single door comprises a left outer shielding cover plate and a left inner shielding cover plate, one side of the left inner shielding cover plate positioned in the vertical direction extends and protrudes outside the left outer shielding cover plate, the right single door comprises a right outer shielding cover plate and a right inner shielding cover plate, intervals are arranged between the sides of the right inner shielding cover plate and the sides of the right outer shielding cover plate, a bonding wire of the left outer shielding cover plate and the right outer shielding cover plate is positioned in the center of the door opening cover plate, and the bonding wires of the left inner shielding cover plate and the right inner shielding cover plate and the bonding wires of the left outer shielding cover plate and the right outer shielding cover plate are staggered mutually to form a labyrinth structure.
Compared with the prior art, the horizontal device for the spent fuel dry-type storage has the following beneficial technical effects:
1) reduce the construction difficulty, improve the structural strength and the durability of the concrete material
The regular octagonal structure is simple in processing and manufacturing process, and meanwhile, a sandwich structure of steel plate-concrete-steel plate is adopted, so that the problems of binding of reinforcing steel bars, supporting of templates, concrete pouring and vibrating and the like can be effectively avoided, and the construction difficulty is reduced; in addition, the steel plate has high structural strength and can bear the safety functions of accident working conditions, such as earthquake, flood, tornado, missile, explosion and the like, the concrete is used as a shielding material to be isolated from the outside, the chemical corrosion influence of chloride, sulfate resistance and the like is avoided, and the durability is obviously improved;
2) eliminate the solid structure blocked by the ventilation flow channel, improve the ventilation and heat exchange capacity and the safety margin
By arranging the support ring plate structure, an independent and unimpeded ventilation flow channel is formed in the cylinder body, the blockage of the ventilation flow channel on an entity structure is eliminated, and the ventilation and heat exchange capacity and the material thermodynamic safety margin are improved;
3) realize the omnibearing restraint of the fuel storage tank and ensure the earthquake-proof safety performance of the accident working condition
The circular hole of each independent support ring plate structure realizes the movement restriction of the spent fuel storage tank within the range of 360 degrees, avoids the plastic deformation and even damage of the storage tank caused by the violent movement of the fuel storage tank under the working condition of earthquake accident, and effectively ensures the safety and sealing safety of the earthquake-proof structure under the working condition of earthquake accident of the spent fuel storage tank;
4) obviously reduce the radiation shielding dose of the ventilation opening and ensure the radiation shielding safety of the operation operators
The air inlet and the air outlet adopt a double-step continuous L-shaped labyrinth passage, so that the continuous shielding and attenuation effects on gamma and neutron rays generated by the spent fuel storage tank are realized, and the radiation dose of operators operating in short-distance transportation and storage of spent fuel is kept at a lower level.
Drawings
The horizontal device for the spent fuel dry storage of the invention is described in detail below with reference to the accompanying drawings and the specific embodiments, wherein:
fig. 1 is a schematic structural diagram of a conventional spent fuel dry storage device.
Fig. 2 is a schematic structural diagram of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 3 is a partial sectional view of the horizontal apparatus for dry-type spent fuel storage according to the present invention.
Fig. 4 is a cross-sectional view 1/2 of the horizontal spent fuel dry storage apparatus of the present invention.
Fig. 5 is a sectional elevation view of the horizontal spent fuel dry-type storage apparatus of the present invention.
Fig. 6 is a side view of the horizontal apparatus for dry storage of spent fuel according to the present invention.
Fig. 7 is a schematic structural view of a base of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 8 is a sectional view of the base of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 9 is an exploded view of the base of the horizontal spent fuel dry-type storage apparatus of the present invention.
Fig. 10 is a schematic structural view of the cylinder body of the horizontal device for dry storage of spent fuel according to the present invention.
Fig. 11 is a schematic structural diagram of an upper end enclosure of the horizontal device for the dry storage of the spent fuel of the invention.
Fig. 12 is a schematic structural view of a bottom cover of the horizontal spent fuel dry-type storage device according to the present invention.
Fig. 13 is a schematic view of a connection structure of an inner shell cylinder and an outer shell cylinder of the horizontal device for the dry storage of spent fuel according to the present invention.
Fig. 14 is a schematic structural diagram of a shell cylinder of the horizontal device for the dry storage of the spent fuel according to the invention.
Fig. 15 is a schematic structural view of an inner shell and a cylinder of the horizontal device for dry storage of spent fuel according to the present invention.
Fig. 16 is a schematic structural view of a connecting rib plate of the horizontal spent fuel dry-type storage device of the present invention.
Fig. 17 is a schematic structural diagram of a hole-type support ring plate structure of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 18 is a side view of a hole type support ring plate structure of the horizontal spent fuel dry storage apparatus of the present invention.
Fig. 19 is a cross-sectional view of a hole type support ring plate structure of the horizontal spent fuel dry storage apparatus of the present invention.
Fig. 20 is a schematic structural view of a door opening cover plate of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 21 is a schematic structural view of a single door on the left side of the door opening cover plate of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 22 is a schematic structural view of a single door on the right side of the door opening cover plate of the horizontal device for dry-type spent fuel storage according to the present invention.
Fig. 23 is a schematic structural diagram of a bottom cover of the horizontal device for dry storage of spent fuel according to the present invention.
Fig. 24 is an exploded view of the bottom cover of the horizontal spent fuel dry-type storage device of the present invention.
Reference numerals:
10-a base; 100-an air inlet; 102-a substrate; 104-a tip; 1020-a convex substrate; 1022-a trapezoidal substrate; 12-a cartridge body; 120-inner shell cylinder; 1200-inner shell air outlet; 1202-inner shell air inlet; 121-connecting ribs; 122-housing cylinder; 1220-shell air outlet; 1222-air inlet holes of the casing; 124-air inlet air flow path; 126-outlet air flow path; 127-door opening cover plate; 1270-left side single door; 12700-left outer shielding cover plate; 12702-left inner shield cover; 1270-left side single door; 12700-left outer shielding cover plate; 12702-left inner shield cover; 128-a bottom cover; 129-upper end enclosure; 130-door spindle; 15-hole type support ring plate structure; 150-annular ring plate; 152-a guide corner plate; 154-a support pallet; 18-a top seat; 180-air outlet; 182-an air outlet substrate; 1820-convex upper substrate; 1824-L type lower base plate; 184-end plate.
Detailed Description
In order to make the objects, technical solutions and technical effects of the present invention more clear, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
Referring to fig. 2 to 24, the horizontal apparatus for dry-type spent fuel storage according to the present invention includes:
a base 10, the bottom of which is provided with an air inlet 100;
the bottom of the cylinder body 12 is fixed on the base 10, the middle part of the cylinder body is an annular space for accommodating a spent fuel storage tank, and the cylinder body comprises an inner shell cylinder 120 with a steel plate structure and an outer shell cylinder 122 with a steel plate structure, concrete (not shown) is filled between the inner shell cylinder 120 and the outer shell cylinder 122 to form a steel plate-concrete-steel plate sandwich layer structure, the bottom of the cylinder body 12 is provided with an air inlet air flow passage 124 communicated with the air inlet 100, and the top of the cylinder body 12 is provided with an air outlet air flow passage 126; and
the top seat 18 is fixed on the top of the cylinder body 12, an air outlet 180 is arranged on the top seat 18, and the air outlet 180 is communicated with an air outlet air flow channel 126 on the top of the cylinder body 12.
Referring to fig. 7 to 9, the base 10 is an inverted trapezoid structure with a groove, and includes a substrate 102 and end heads 104 located at two ends of the substrate 102, the substrate 102 and the end heads 104 are both independent prefabricated modules, the substrate 102 includes a convex substrate 1020 and trapezoid substrates 1022 symmetrically distributed on two sides of the convex substrate 1020, the trapezoid substrates 1022 and the end heads 104 at two ends are all coated with steel plates at outer layers, the inner layers are filled with a sandwich layer structure of "steel plate-concrete-steel plate" without reinforced concrete, and the convex substrate 1020 and the trapezoid substrates 1022 are respectively welded with the end heads 104 at two ends to form an integrated structure. In other embodiments, the base 10 may be an inverted trapezoidal whole concrete structure or a reinforced concrete structure, and may be formed integrally.
In the setting process, a double-step L-shaped labyrinth air inlet in mirror symmetry is arranged between the convex substrate 1020 and the trapezoidal substrate 1022, or a single-step L-shaped labyrinth air inlet may be arranged between one of the trapezoidal substrates 1022 and the convex substrate 1020, and the other trapezoidal substrate 1022 is directly connected with the convex substrate 1020. In design, the convex substrate 1020 is placed on a horizontal plane, a certain space is reserved between the trapezoidal substrate 1022 on both sides and the horizontal plane and between both sides of the convex substrate 1020, the upper portion of the shorter side of the trapezoidal substrate 1022 and the upper portion of the convex substrate 1020 are at the same horizontal position, and finally the end heads 104 are arranged at both ends to form the inverted trapezoidal base 10 with the air inlet 100. The upper part of the end head 104 is provided with an inverted trapezoidal groove which is matched with the shape of the lower part of the cylinder body 12.
Referring to fig. 2, 5, 10 to 16, the cylinder body 12 is directly seated in the inverted trapezoidal groove of the base 10 and is fixedly connected to the base 10 by bolts. The longitudinal section of the cylinder body 12 is a regular polygon structure, specifically regular polygons such as regular hexagon, regular octagon, regular decagon, regular dodecagon, regular hexadecagon, and the like, and comprises an inner shell cylinder 120, an outer shell cylinder 122, and a door opening cover plate 127 and a bottom cover 128 which are arranged at two ends of the inner shell cylinder 120 and the outer shell cylinder 122, wherein the inner shell cylinder 120 and the outer shell cylinder 122 are thin-wall steel plate structures, non-reinforced concrete is filled between the inner shell cylinder 120 and the outer shell cylinder 122, the door opening cover plate 127 and the bottom cover 128 are both coated by steel plates, and the inner layer is filled with a steel plate-concrete-steel plate sandwich layer structure without reinforced concrete. In order to enhance the overall structural strength of the cylinder body 12, the connecting rib plates 121 are welded between the outer shell cylinder 122 and the inner shell cylinder 120, and the connecting rib plates 121 are also thin-walled steel plates.
As a preferred embodiment of the present invention, an upper end cap 129 is disposed between the door opening cover 127 and the inner shell cylinder 120 and the outer shell cylinder 122, the longitudinal section of the inner shell cylinder 120, the longitudinal section of the outer shell cylinder 122, the door opening cover 127, the bottom cap 128 and the upper end cap 129 are all regular polygonal structures, such as regular hexagon, regular octagon, regular decagon, regular dodecagon, regular hexadecgon, etc., and the connecting rib 121 is welded at the position of the polygonal corner of the outer shell cylinder 122 and the inner shell cylinder 120. In the illustrated embodiment, the longitudinal section of the inner shell cylinder 120, the longitudinal section of the outer shell cylinder 122, the door opening cover plate 127, the bottom cover 128 and the upper end cap 129 are all regular octagonal structures, the finally formed cylinder body 12 is a regular octagonal structure, and the connecting rib plates 121 are welded at the regular octagonal corners of the outer shell cylinder 122 and the inner shell cylinder 120. The bottom cover 128 is welded with the inner shell cylinder 120 and the outer shell cylinder 122, the upper end enclosure 129 is a thin steel plate and is matched with the inner shell cylinder 120 and the outer shell cylinder 122 in structure, the middle part of the upper end enclosure 129 is of a circular opening structure, the upper edge of the upper end enclosure 129 is welded with the outer shell cylinder 122, and the lower edge of the upper end enclosure 129 is welded with the inner shell cylinder 120.
Referring to fig. 16, the connecting rib plates 121 are thin-walled small-sized steel plates, and are respectively welded to two ends of the inner shell cylinder 120 and the outer shell cylinder 122, and 8 connecting rib plates 121 are respectively welded to the front end and the rear end for enhancing the structural strength of the cylinder body 12.
Referring to fig. 13 to 15, the shell cylinder 122 is formed by welding eight standard rectangular thin-wall steel plates with the same structure and shape, and since the whole shell is stored horizontally, at least one shell air outlet 1220 is formed in the steel plate at the uppermost end of the shell cylinder 122 to meet the requirement of natural ventilation. In a preferred embodiment of the present invention, two strip-shaped housing air outlets 1220 are formed in the uppermost steel plate of the housing cylinder 122, the housing air outlets 1220 are rectangular, the front ends of the housing air outlets 1220 are spaced from the front edge of the housing cylinder 122, and the rear ends of the housing air outlets 1220 directly penetrate the rear edge of the housing cylinder 122. Meanwhile, two strip-shaped casing air inlet holes 1222 identical in shape and structure characteristics to the casing air outlet holes 1220 are formed in the lower steel plate opposite to the uppermost steel plate of the casing cylinder 122. The number of the housing air outlet 1220 and the housing air inlet 1222 can be set according to actual conditions.
The inner shell barrel 120 and the outer shell barrel 122 are arranged in the same manner, and are also formed by welding eight standard rectangular thin-wall steel plates with the same structure and shape, two strip-shaped inner shell air outlets 1200 are formed in the uppermost steel plate of the inner shell barrel 120, the shape and structure of the inner shell air outlets 1200 are the same as those of the outer shell air outlets 1220, and the inner shell air outlets and the outer shell air outlets 1220 form an air outlet air flow channel 126 of the whole barrel body 12. Meanwhile, two strip-shaped inner shell air inlet holes 1202 are formed in the lower steel plate opposite to the front surface of the lowest steel plate of the inner shell barrel 120, the shape and structure of the inner shell air inlet holes 1202 are the same as those of the outer shell air inlet holes 1222, and the inner shell air inlet holes 1202 and the outer shell air inlet holes 1222 form an air inlet air flow passage 124 of the whole barrel body 12. When the cartridge body 12 is secured to the base 10, the inlet air channel 124 communicates with the inlet 100 of the base 10. The number of the inner case outlet holes 1200 and the inner case air inlet holes 1202 can also be set according to actual conditions.
The manufacturing process of the cylinder body 12 is as follows:
firstly, concrete pouring and welding forming of the bottom cover 128 are completed;
secondly, prefabricating and welding forming of the inner shell barrel 120 and the outer shell barrel 122 are completed;
welding the inner shell cylinder 120, the outer shell cylinder 122 and the bottom cover 128;
filling plain concrete into the sandwich layer of the inner shell cylinder 120 and the outer shell cylinder 122;
and fifthly, welding and sealing the upper end enclosure 129 with the inner shell cylinder 120 and the outer shell cylinder 122 for forming.
Referring to fig. 19, the door opening cover plate 127 is generally regular octagon, and includes a left single door 1270 and a right single door 1272, the door opening cover plate 127 is opened and closed by adopting a horizontal sliding double-door structure design, the left single door 1270 and the right single door 1272 are both coated by outer steel plates, the inner layer is filled with a steel plate-concrete-steel plate sandwich layer structure without reinforced concrete, and the left single door 1270 and the right single door 1272 are connected with the upper end enclosure 129 through door shafts 130 arranged on both sides of the upper end enclosure 129.
Referring to fig. 3, 4, 17 to 19, in order to prevent the spent fuel storage tank from being structurally damaged due to horizontal and vertical vibration under accident conditions such as flood and earthquake, and prevent radioactive leakage caused by tank rupture, a plurality of support ring plate structures are disposed on the inner cavity of the inner shell cylinder 120, and the support ring plate structures include a hole-type support ring plate structure 15 and/or a semicircular support ring plate structure, preferably, the hole-type support ring plate structure 15, in the illustrated embodiment, 4 hole-type support ring plate structures 15 are disposed on the inner cavity of the regular octagonal inner shell cylinder 120, the hole-type support ring plate structure 15 includes an annular ring plate 150 fixedly connected with the inner shell cylinder 120, a guide angle plate 152 fixedly connected with the annular ring plate 150, and a support angle plate 154, the annular ring plate 150 is a thin-walled steel plate, and the outer contour thereof is a regular octagonal structure, each side and inner shell barrel 120 welded connection, the middle part is provided with the round hole (not numbered in the figure) that holds the spent fuel storage tank, and direction scute 152 and supporting pallet 154 are steel, become the integral structure with annular ring board 150 welded connection respectively, have constituted the ventilation runner of mutually independent non-obstacle between each annular ring board 150, can furthest reduce the ventilation flow resistance, improve heat exchange efficiency, can guarantee the structural safety of spent fuel storage tank under the accident condition moreover. The supporting support plate 154 is in a circular arc structure and is basically flush with the inner circular ring surface of the annular ring plate 150, the included angle between the two ends of the supporting support plate 154 and the axis of the circular hole is 60-120 degrees, the effect is the best when the included angle is 60 degrees, and the weight of the spent fuel storage tank is uniformly borne under the combined action of the 4 annular ring plates 150 and the supporting support plate 154. In the illustrated embodiment, the guiding angle plate 152 is an arc triangle or a structure with rounded corners, and is welded on one side of the annular ring plate 150 facing the inlet of the spent fuel storage tank, and an included angle between two ends of the guiding angle plate 152 and the axis of the circular hole is 25 to 40 degrees, preferably 30 degrees, and is respectively arranged at the upper, lower, left and right 4 positions on the front side of the circular hole of the annular ring plate 150, and the included angle between the positions is 90 degrees, so that when the spent fuel storage tank is prevented from being pushed into the circular hole, the spent fuel storage tank is prevented from colliding with the ring plate 150 in all directions due to positioning operation deviation, and meanwhile, the structure of the spent fuel storage tank and the.
When the operation is operated, utilize the pneumatic cylinder of configuration on the transfer trailer, push the circular hole of hole type support ring plate structure 15 one by one with the spentnuclear fuel storage tank, the weight of whole spentnuclear fuel storage tank is evenly born to the support layer board 154 dispersion through every circular hole bottom, because the circular hole can realize 360 restraints to the spentnuclear fuel storage tank, every spentnuclear fuel storage tank hole type support ring plate structure 15 is mutually independent each other, make local 12 inside of barrel form the unobstructed ventilation runner of mutual noninterference, can reduce the flow resistance ventilation by the at utmost, improve heat exchange efficiency, and can guarantee under the accident condition the structure safety of spentnuclear fuel storage tank.
In other embodiments, the number of the hole-type supporting ring plate structures 15 is not limited, and the shapes of the guiding angle plate 152 and the supporting plate 154 and the included angle between the guiding angle plate and the axis of the circular hole are not limited, and can be selected according to actual needs. The hole-type support ring plate structure 15 can also be replaced by a semicircular support ring plate structure, when the hole-type support ring plate structure is adopted, the semicircular support ring plate is formed by the annular ring plate, the arrangement mode of the guide angle plate and the support supporting plate is the same, except that mutually independent barrier-free ventilation flow channels cannot be formed between the semicircular ring plates, and other functions and arrangement modes are basically consistent with the hole-type support ring plate structure 15. A hole-type support ring plate structure 15 and a semicircular support ring plate structure can also be arranged at the same time.
Referring to fig. 21 and 22, the left single door 1270 includes a left outer shielding cover 12700 and a left inner shielding cover 12702, one side of the left inner shielding cover 12702 in the vertical direction (i.e., the side near the vertical center axis of the door opening cover 127) extends and protrudes outside the left outer shielding cover 12700, the right single door 1272 includes a right outer shielding cover 12720 and a right inner shielding cover 12722, and a distance is provided between each side of the right inner shielding cover 12722 and each side of the right outer shielding cover 12720 (i.e., each side of the right inner shielding cover 12722 is smaller in size than the right outer shielding cover 12720). Left outer shielding cover 12700 and right outer shielding cover 12720 are identical in configuration, left inner shielding cover 12702 and right inner shielding cover 12722 are similar in configuration, left inner shielding cover 12702 is relatively long, right inner shielding cover 12722 is relatively short, and the junction line between left outer shielding cover 12700 and right outer shielding cover 12720 is located in the center of door opening cover 127 (i.e., the vertical axis of door opening cover 127). Right octagonal structure is formed after left inner shielding cover 12702 and right inner shielding cover 12722 are joined, and the joint line of left inner shielding cover 12702 and right inner shielding cover 12722 and the joint line of left outer shielding cover 12700 and right outer shielding cover 12720 are offset from each other to form a labyrinth structure.
When carrying out the operation of spent fuel storage, at first the manual left side single-door 1270 and the single-door 1272 of right side to 90 of opening, then will transport the container and fix a position with horizontal concrete module through transporting the trailer, after the position alignment, will transport the container bottom cover plate and open, will transport the inside spent fuel storage tank of container and pass through the pneumatic cylinder with inside the spent fuel storage tank push barrel body 12. After the cover plate at the bottom of the transfer container is opened, the spent fuel storage tank is directly contacted with the external environment, and the radiation dose is high, so that the left single door 1270 and the right single door 1272 of the door opening can play a role in radiation shielding protection, and the radiation dose irradiation of gamma and neutron rays generated by the spent fuel assembly to operating personnel during alignment operation is effectively reduced.
Referring to fig. 5, 23 and 24, the top seat 18 includes an air outlet base plate 182 and end plates 184 with cubic structures at two ends, the air outlet base plate 182 includes a convex upper base plate 1820 and L-shaped lower base plates 1824 at two sides, the L-shaped lower base plates 1824 are symmetrically distributed at the left and right sides, are located at the lower part of the convex upper base plate 1820, and have a certain gap with the convex upper base plate 1820. In the illustrated embodiment, the convex upper substrate 1820 is a double-step convex upper substrate or a single-step convex upper substrate, the convex upper substrate 1820, the L-shaped lower substrate 1824 and the end plate 184 on both sides are coated with steel plates, the inner layer is filled with a non-reinforced concrete "steel plate-concrete-steel plate" sandwich layer structure, and the steel plates are welded into an integral structure, when the convex upper substrate 1820 is the double-step convex upper substrate, the double-step L-shaped labyrinth air outlet 180 in mirror symmetry is finally formed, and when the convex upper substrate is the single-step convex upper substrate, the single-step L-shaped labyrinth air outlet is formed. The top seat 18 is directly located on the top of the cylinder body 12 and is fixedly connected with the cylinder body 12 through bolts, and after the top seat and the cylinder body are connected, the air outlet 180 of the top seat 18 is communicated with the air outlet air flow channel 126 on the top of the cylinder body 12.
External natural air firstly enters from an air inlet 100 of the base 10, then enters an inner cavity of the cylinder body 12 along the double-L-shaped labyrinth passage, then enters an air outlet 180 of the top seat 18 through the octagonal ventilation flow passage between the supporting ring plate structures 15, and the decay heat of the spent fuel assembly is continuously led out through passive natural circulation of air. By adopting the double-step continuous L-shaped labyrinth air flow channel design for the air inlet 100 and the air outlet 180 and adopting the independent and unimpeded ventilation flow channel design for the interior of the cylinder body 12, the radiation dose level at the air vent is reduced as much as possible while the ventilation and heat exchange capacity is enhanced.
It should be noted that, although the structures of the top seat 18, the bottom seat 10, the door opening cover plate 127 and the bottom cover 128 in the horizontal device for dry-type spent fuel storage according to the present invention are all steel plate-clad outer layers, and the inner layer is filled with a "steel plate-concrete-steel plate" sandwich layer structure without reinforced concrete, in other embodiments, the top seat 18, the bottom seat 10, the door opening cover plate 127 and the bottom cover 128 may be a full concrete structure or a reinforced concrete structure, or a partial full concrete structure and a partial reinforced concrete structure, and may be formed integrally or fixedly connected by bolts.
It should be further noted that, although the embodiment of the horizontal apparatus for dry storage of spent fuel according to the present invention is described only with respect to the regular octagonal structure, in other embodiments of the present invention, the cylinder body 12, the inner shell cylinder 120, the outer shell cylinder 122, the door opening cover 127, the bottom cover 128, the upper end cap 129 and the hole-type supporting ring plate structure 15 may also be other regular polygonal structures such as regular hexagon, regular decagon, regular dodecagon, regular hexadecgon, etc., and the inverted trapezoidal recess of the base 10 and the top seat 18 are respectively disposed opposite to the regular polygonal structures. Meanwhile, the inner shell barrel 120, the outer shell barrel 122, the door opening cover plate 127, the bottom cover 128 and the upper end cover 129 can also be circular structures, and correspondingly, the hole-type support ring plate structure 15 can also be circular structures.
Compared with the prior art, the horizontal device for the spent fuel dry-type storage has the following beneficial technical effects:
1) reduce the construction difficulty, improve the structural strength and the durability of the concrete material
The regular octagonal structure is simple in processing and manufacturing process, and meanwhile, a sandwich structure of steel plate-concrete-steel plate is adopted, so that the problems of binding of reinforcing steel bars, supporting of templates, concrete pouring and vibrating and the like can be effectively avoided, and the construction difficulty is reduced; in addition, the steel plate has high structural strength and can bear the safety functions of accident working conditions, such as earthquake, flood, tornado, missile, explosion and the like, the concrete is used as a shielding material to be isolated from the outside, the chemical corrosion influence of chloride, sulfate resistance and the like is avoided, and the durability is obviously improved;
2) eliminate the solid structure blocked by the ventilation flow channel, improve the ventilation and heat exchange capacity and the safety margin
By arranging the support ring plate structure, an independent and unimpeded ventilation flow channel is formed in the cylinder body, the blockage of the ventilation flow channel on an entity structure is eliminated, and the ventilation and heat exchange capacity and the material thermodynamic safety margin are improved;
3) realize the omnibearing restraint of the fuel storage tank and ensure the earthquake-proof safety performance of the accident working condition
The circular hole of each independent support ring plate structure realizes the movement restriction of the spent fuel storage tank within the range of 360 degrees, avoids the plastic deformation and even damage of the storage tank caused by the violent movement of the fuel storage tank under the working condition of earthquake accident, and effectively ensures the safety and sealing safety of the earthquake-proof structure under the working condition of earthquake accident of the spent fuel storage tank;
4) obviously reduce the radiation shielding dose of the ventilation opening and ensure the radiation shielding safety of the operation operators
The air inlet and the air outlet adopt a double-step continuous L-shaped labyrinth passage, so that the continuous shielding and attenuation effects on gamma and neutron rays generated by the spent fuel storage tank are realized, and the radiation dose of operators operating in short-distance transportation and storage of spent fuel is kept at a lower level.
The present invention can be modified and adapted appropriately from the above-described embodiments, according to the principles described above. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.
Claims (11)
1. A horizontal device for spent fuel dry storage is characterized by comprising:
the bottom of the base is provided with an air inlet;
the cylinder body is provided with a space for accommodating the spent fuel storage tank, the bottom of the cylinder body is fixed on the base and comprises an inner shell cylinder body with a steel plate structure and an outer shell cylinder body with a steel plate structure, concrete is filled between the inner shell cylinder body and the outer shell cylinder body to form a sandwich layer structure of 'steel plate-concrete-steel plate', the bottom of the cylinder body is provided with an air inlet air flow channel communicated with the air inlet, and the top of the cylinder body is provided with an air outlet air flow channel; and
the top seat is fixed at the top of the cylinder body and provided with an air outlet which is communicated with an air flow passage of the air outlet at the top of the cylinder body;
the inner cavity of the inner shell barrel is provided with a plurality of support ring plate structures, each support ring plate structure comprises an annular ring plate fixedly connected with the inner shell barrel, a guide angle plate fixedly connected with the annular ring plate and a support supporting plate, the middle of each annular ring plate is a round hole for accommodating a spent fuel storage tank, and mutually independent barrier-free ventilation flow channels are formed among the annular ring plates.
2. The horizontal device for the dry-type storage of spent fuel according to claim 1, wherein the guide angle plate is a circular-arc triangle or a rounded corner, the included angle between the two ends and the axis of the circular hole in the middle of the annular ring plate is 25-40 °, the support supporting plate is a circular-arc shape, and the included angle between the two ends and the axis of the circular hole in the middle of the annular ring plate is 60-120 °.
3. The horizontal device for the dry-type storage of spent fuel according to claim 2, wherein the guide angle plate has a circular arc-shaped triangular structure, the included angle between the two ends of the guide angle plate and the axis of the circular hole in the middle of the annular ring plate is 30 °, the support supporting plate has a circular arc-shaped support angle, and the included angle between the two ends of the support angle plate and the axis of the circular hole in the middle of the annular ring plate is 60 °.
4. The horizontal device for the dry-type storage of the spent fuel according to claim 1, wherein the longitudinal section of the cylinder body is a regular polygon structure, the longitudinal sections of the outer shell cylinder and the inner shell cylinder are both regular polygon structures consistent with the cylinder body, the inner shell cylinder and the outer shell cylinder are connected by welding through connecting ribs, and the connecting ribs are positioned at the polygon corners of the outer shell cylinder and the inner shell cylinder.
5. The horizontal spent fuel dry storage device according to claim 4, wherein the longitudinal sections of the outer shell cylinder and the inner shell cylinder are regular octagonal structures, and the connecting ribs are located at the octagonal corners of the outer shell cylinder and the inner shell cylinder.
6. The horizontal spent fuel dry-type storage device according to claim 1, wherein the outer shell cylinder and the inner shell cylinder are each formed by welding eight standard rectangular thin-walled steel plates having the same structure and shape, and the uppermost and lowermost steel plates are horizontal; the outer shell barrel and the inner shell barrel are respectively provided with at least one air inlet at the bottom steel plate, so that an air inlet air flow channel of the whole barrel body is formed, and the outer shell barrel and the inner shell barrel are respectively provided with at least one air outlet at the top steel plate, so that an air outlet air flow channel of the whole barrel body is formed.
7. The horizontal device for dry-type storage of spent fuel according to claim 6, wherein the front ends of the air outlet holes and the air inlet holes are spaced from the front edge of the cylinder body, and the rear ends of the air outlet holes and the air inlet holes are directly connected to the rear edge of the cylinder body.
8. The horizontal spent fuel dry-type storage device according to claim 1, wherein the base comprises a base plate and end heads at two ends of the base plate, the base plate comprises a convex base plate and a trapezoidal base plate distributed at two sides of the convex base plate, the convex base plate and the trapezoidal base plate are respectively fixedly connected with the end heads at two ends, a double-step L-shaped labyrinth air inlet in mirror symmetry is arranged between the convex base plate and the trapezoidal base plate, or a single-step L-shaped labyrinth air inlet is arranged between the convex base plate and the trapezoidal base plate.
9. The horizontal spent fuel dry-type storage device according to claim 1, wherein the top seat comprises an air outlet base plate and two end plates, the air outlet base plate comprises a convex upper base plate and L-shaped lower base plates symmetrically distributed on two sides of the convex upper base plate, the L-shaped lower base plates are located at the lower parts of the convex upper base plates, the convex upper base plate and the L-shaped lower base plates are fixedly connected with the two end plates respectively to form a double-step L-shaped labyrinth air outlet in mirror symmetry, or the convex upper base plate and the two side L-shaped lower base plates are fixedly connected with the two end plates respectively to form a single-step L-shaped labyrinth air outlet.
10. The horizontal device for the dry-type storage of the spent fuel according to claim 1, wherein the barrel body further comprises door opening cover plates and a bottom cover which are arranged at two ends of the inner shell barrel and the outer shell barrel, the door opening cover plates comprise a left single door and a right single door, and the door opening cover plates are opened and closed by adopting a horizontal-pulling double-door structure design.
11. The horizontal device for the dry-type storage of the spent fuel according to claim 10, wherein the left single door comprises a left outer shielding cover plate and a left inner shielding cover plate, one side of the left inner shielding cover plate in the vertical direction extends and protrudes outside the left outer shielding cover plate, the right single door comprises a right outer shielding cover plate and a right inner shielding cover plate, a distance is arranged between each side of the right inner shielding cover plate and each side of the right outer shielding cover plate, a bonding wire of the left outer shielding cover plate and the right outer shielding cover plate is located in the center of the door opening cover plate, and the bonding wires of the left inner shielding cover plate and the right inner shielding cover plate and the bonding wires of the left outer shielding cover plate and the right outer shielding cover plate are staggered to form a labyrinth structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109243645B (en) * | 2018-09-13 | 2022-03-01 | 中国核动力研究设计院 | Spent fuel assembly storage grillwork |
| CN109448882A (en) * | 2018-10-17 | 2019-03-08 | 中广核工程有限公司 | Nuclear Power Station's Exhausted Fuels Dry storage concrete silo |
| CN110534218B (en) * | 2019-09-12 | 2023-07-18 | 中广核工程有限公司 | Nuclear power plant spent fuel horizontal storage module |
| CN113421686A (en) * | 2021-06-25 | 2021-09-21 | 中国核电工程有限公司 | Movable supporting device for concrete dry-method storage system |
| CN113851241A (en) * | 2021-09-22 | 2021-12-28 | 上海核工程研究设计院有限公司 | Ventilation and radiation protection structure of concrete silo type spent fuel storage device |
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