CN109448882A - Nuclear Power Station's Exhausted Fuels Dry storage concrete silo - Google Patents
Nuclear Power Station's Exhausted Fuels Dry storage concrete silo Download PDFInfo
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- CN109448882A CN109448882A CN201811207583.XA CN201811207583A CN109448882A CN 109448882 A CN109448882 A CN 109448882A CN 201811207583 A CN201811207583 A CN 201811207583A CN 109448882 A CN109448882 A CN 109448882A
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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
- G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
- G21F9/28—Treating solids
- G21F9/34—Disposal of solid waste
- G21F9/36—Disposal of solid waste by packaging; by baling
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Abstract
The invention discloses a kind of Nuclear Power Station's Exhausted Fuels Dry storage concrete silos comprising: bottom plate；It in hollow cylindrical cylinder lining, is fixedly connected on bottom plate, bottom is equipped with air inlet in cylinder lining；Concrete tube is arranged in cylinder lining；And air outlet ring seat and top cover, it is installed on concrete tube；Wherein, concrete silo is additionally provided with air intake pipe, air intake pipe includes the vertical section for being set to the horizontal segment in nonactive section of top of irradiated fuel assembly fuel rod region and extending along concrete tube short transverse, external elements air enters the horizontal segment of air intake pipe in the horizontal direction, it is flowed straight down then along air intake pipe, enter the ring cavity region of car for spent fuel storage tank and silo inside liner composition finally by the air inlet for being provided with inside liner bottom, and is flowed out through air outlet ring seat.
Description
Technical field
The invention belongs to technical field of nuclear power, it is more particularly related to a kind of Nuclear Power Station's Exhausted Fuels Dry storage
Use concrete silo.
Background technique
The fuel that Nuclear Power Station's Exhausted Fuels dry storage concrete silo is used to store and protect sealing to load irradiated fuel assembly
Basin.As the important items of nuclear safety, spent fuel dry-type storage concrete silo executes nuclear safety in long term storage
Function includes: to provide car for spent fuel storage tank structural defence and radiation shield, provides air convection channel, utilizes air Natural Circulation band
Irradiated fuel assembly decay heat is walked, car for spent fuel storage tank is adequately cooled.
Currently, widely applied spentnuclear fuel concrete silo is generally the Integral vertical cylinder of inner hollow in the world,
For storing car for spent fuel storage tank, mainly it is made of top cover, cylinder and pedestal.Concrete silo bottom regional area be provided with pair
Externally open air outlet is arranged in concrete silo top cover in outer open air inlet, and cold air enters from bottom level direction
Air inlet becomes hot-air after taking away irradiated fuel assembly decay heat subsequently into the ring cavity between car for spent fuel storage tank and silo, most
Drain afterwards from top cover air outlet.
For the irradiated fuel assembly of storage, in every fuel rod of PWR of Nuclear Power Station irradiated fuel assembly not at present
100% filling UO2 pellet, it may be assumed that in order to be fastened in single fuel rod to fuel pellet, be provided with and compress in stick inner top
Spring, holddown spring occupied space height is about 15cm or so.The region is since without filling pellet, relative dosage levels are in radial direction
Dose curve distribution is upper minimum.Fuel pellet is loaded below holddown spring, which occurs fission reaction and generate neutron and gal
Horse ray belongs to active section region, and dose level of radiation is with respect to highest.
But the spentnuclear fuel concrete silo of the prior art at least has the following deficiencies:
Firstly, air inlet is located at device bottom, it is in fuel assembly active section region, irradiation dose is high: existing vertical cylinder
The air inlet in storehouse is respectively positioned on the bottom of silo, and bottom belongs to the corresponding region of irradiated fuel assembly " active section ".In the region, radiation
Dosage level is higher, provides radiation channel for irradiated fuel assembly and gamma-rays, is carrying out irradiated fuel store technological operation and day
During normal inspection, staff's exposure dosage is high.
Secondly, air inlet is located at device bottom, terrorist attack is subject to as core security hidden danger: due in car for spent fuel storage tank
Portion's storage is high radioactivity irradiated fuel assembly, for core security angle, since vent position is lower, is subject to outside
It attacks (alien material may also be easier to enter), easily becomes the weak link and security risk of entity security.
Finally, air outlet is externally unlimited air discharge structure design, belong to personnel and irradiate high dose area: existing vertical silo is set
Standby air outlet externally opens wide setting, it is difficult to avoid irradiated fuel assembly and gamma-rays from radiating storage areas and irradiate, the region is same
Sample belongs to dose level of radiation upper zone.During carrying out irradiated fuel store technological operation and equipment Daily Round Check, equally
It is relatively high in air outlet region exposure dosage to will lead to operation maintenance personnel.
In view of this, it is good it is necessory to provide a kind of integral radiation shield effectiveness, and car for spent fuel storage tank reality can be successfully managed
The Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of body safety.
Summary of the invention
Goal of the invention of the invention is: it is good to overcome the deficiencies of the prior art and provide a kind of integral radiation shield effectiveness, and
The Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of car for spent fuel storage tank entity security can be successfully managed.
In order to achieve the above-mentioned object of the invention, the present invention provides a kind of Nuclear Power Station's Exhausted Fuels Dry storage concrete tubes
Storehouse comprising:
Bottom plate；
It in hollow cylindrical cylinder lining, is fixedly connected on bottom plate, bottom is equipped with air inlet in cylinder lining；
Concrete tube is arranged in cylinder lining；And
Air outlet ring seat and top cover, are installed on concrete tube；
Wherein, concrete silo is additionally provided with air intake pipe, and air intake pipe includes being set at the top of irradiated fuel assembly fuel rod
The horizontal segment in nonactive section of region and the vertical section extended along concrete tube short transverse, external elements air is along horizontal
Direction enters the horizontal segment of air intake pipe, flows straight down then along air intake pipe, finally by being provided with inside liner bottom
The ring cavity region that the air inlet in portion enters car for spent fuel storage tank and silo inside liner is constituted, and flowed out through air outlet ring seat.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, in the air outlet ring seat
Side wall is equipped with recessed portion, and the top cover is equipped with skirt, and skirt extends into recessed portion and is set in distance, will be in air outlet ring seat
Lower two layers of vent flow path is isolated.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, air inlet is set to weary combustion
Expect nonactive section of region of holddown spring of component upper end, concrete silo air inlet width is no more than the pressure of irradiated fuel assembly upper end
Tight nonactive section of region of spring.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, concrete tube passes through one
Change pouring molding and irradiated fuel assembly gamut is shielded.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, the air outlet ring seat is set
There is vertical " concave " labyrinth type vent flow path, air outlet is respectively positioned on the inside of ring seat, takes face-to-face arrangement form, pass through inside
Concealed ventilation and face-to-face arrangement.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, the air intake pipe includes
Horizontal blast pipe, the flase floor being nested in inside horizontal blast pipe and vertical air intake duct, horizontal blast pipe and vertical air intake duct are logical
It crosses and connection is welded and fixed, be fixedly connected by welding in horizontal blast pipe and cylinder lining, in vertical air intake duct and cylinder lining
It is fixedly connected by welding with bottom plate, forms air inlet runner.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, the cylinder lining is surrounded
In be equipped with it is multiple independently of one another and air inlet runner, each air inlet runner are uniformly distributed in the cylinder lining.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, the silo top cover is equipped with
Pyramid type prismatic table shape wind-guiding platform, the angle between the circular conical surface and bottom plane of wind-guiding platform are 30 ° to 60 °.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, set in the cylinder lining
There is the fixed support of wedge shape, the fixed support of wedge shape includes two blocks of wedge-shaped side plates and connecting plate, top angle≤30 ° of wedge-shaped side plate.
As a kind of improvement of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention, set in the cylinder lining
There is the fixed support of multiple wedge shapes, the fixed support of wedge shape is uniformly distributed along the inner surface in cylinder lining.
Compared with the existing technology, Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention at least has following technology
Effect:
In terms of radiation shield: sufficiently combining irradiated fuel assembly vertical " nonactive section " and " active section " radiation dose rate point
Cloth inherent characteristic, by being arranged air inlet at the top of irradiated fuel assembly fuel rod in " nonactive section " corresponding altitude range,
Realize air outlet area radiation dosage level minimum.For other " active section " regions of irradiated fuel assembly fuel rod, pass through
Heavy wall concrete carries out gamut shielding, realizes radiation screening effect maximization.It is designed based on above-mentioned radiation shielding structure, it can
Concrete silo neighboring area dose level of radiation is reduced to the greatest extent, and the radiation of concrete silo bottom workspace is effectively reduced
Dosage level, so that staff's exposure dosage is substantially during carrying out irradiated fuel store technological operation and Daily Round Check
It reduces.
Further, since air outlet runner takes " concave " labyrinth to design, while air outlet takes the medial surface pair covered entirely
Face Design of ventilation utmostly reduces concrete silo top air outlet region neutron and gamma-ray sky scattering and to weary combustion
Expect that storage technology operation and the radiation of Daily Round Check staff are irradiated.
In terms of core security: since air inlet is located at equipment elevated areas, eliminating existing concrete silo low level air inlet and hold
It is subject to external attack to destroy, to influence high radioactivity class nuclear material (irradiated fuel assembly) entity defendance security risk.
Structure secure context: it since concrete silo inside liner is provided with circumferential fixed support, realizes and spentnuclear fuel is store
Tank horizontal direction displacement constraint, preventing existing car for spent fuel storage tank from colliding in the case where earthquake accident conditions are without restriction mode with silo may
Caused basin deformation is damaged.
Detailed description of the invention
With reference to the accompanying drawings and detailed description, to Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention into
Row is described in detail, in which:
Fig. 1 is the structural schematic diagram of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Fig. 2 is the top view of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Fig. 3 is the side view of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Fig. 4 is the structural schematic diagram of car for spent fuel storage tank in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Fig. 5 is that the concrete silo Radiation Shielding Re design of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention shows
It is intended to.
Fig. 6 is that the car for spent fuel storage tank aeration structure of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention is illustrated
Figure.
Fig. 7 is the Facad structure signal of air outlet ring seat in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
Figure.
Fig. 8 is the backside structure signal of air outlet ring seat in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
Figure.
Fig. 9 is the schematic top plan view of air outlet ring seat in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 10 is the elevational schematic view of air outlet ring seat in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 11 is the structural representation of outlet air oral shield in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
Figure.
Figure 12 is that the structure of concrete silo top cover in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention is shown
It is intended to.
Figure 13 is the side view of concrete silo top cover in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 14 is the other side of concrete silo top cover in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
View.
Figure 15 is the structural schematic diagram of silo steel skeleton in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 16 is another structure of silo steel skeleton in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
Schematic diagram.
Figure 17 is the schematic top plan view of silo steel skeleton in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 18 is another structure of silo steel skeleton in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
Schematic diagram.
Figure 19 is the structural schematic diagram of concrete barrel in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 20 is the structural schematic diagram of fixed support in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 21 is the structural schematic diagram of air intake pipe in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 22 is the schematic cross-sectional view of air intake pipe in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 23 is the structural schematic diagram of horizontal blast pipe in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 24 is the structural schematic diagram of vertical air intake duct in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 25 is the structural schematic diagram of flase floor in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 26 is the structural schematic diagram of concrete tube in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 27 is the schematic cross-sectional view of concrete tube in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Figure 28 is the bottom view of concrete tube in Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention.
Specific embodiment
In order to be more clear goal of the invention of the invention, technical solution and its technical effect, below in conjunction with attached drawing and tool
Body embodiment, the present invention will be described in further detail.It should be understood that specific embodiment party described in this specification
Formula is not intended to limit the present invention just for the sake of explaining the present invention.
It please refers to shown in Fig. 1 to Figure 27, Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention includes bottom plate 15；
It is fixedly connected on 13 in the hollow cylindrical cylinder lining on bottom plate 15,13 are equipped with air inlet in cylinder lining；Concrete tube 16,
13 setting in cylinder lining；And it is installed on air outlet ring seat 11 and top cover 12 on concrete tube 16；Wherein, concrete
Silo is additionally provided with air intake pipe 14, and air intake pipe 14 is non-live at the top of 16 irradiated fuel assembly fuel rod of concrete tube including being set to
Property section region horizontal segment and the vertical section that extends along 16 short transverse of concrete tube, external elements air is along level side
It to the horizontal segment for entering air intake pipe 14, is flowed straight down then along air intake pipe 14, finally by being provided with inside liner
The ring cavity region that the air inlet of 13 bottoms enters car for spent fuel storage tank and silo inside liner 13 is constituted, and flowed by air outlet ring seat 11
Out.
It please refers to shown in Fig. 1 to Fig. 6, bottom plate 15 is single layer heavy wall circular steel plate, and 13 be independent hollow in cylinder lining
Thick-walled metal cylinder is equipped with the air inlet (not marking) of perforation in bottom of cylinder circular segments.13 are seated gold in cylinder lining
Belong on bottom plate 15, the two constitutes the base metal structure of entire silo by being welded to connect.
Air intake pipe 14 is " inverted L " type structure, is divided into horizontal segment and vertical section, wherein horizontal segment position in the vertical direction
The nonactive section of region at the top of irradiated fuel assembly fuel rod, and run through entire concrete tube 16, vertical section then respectively with cylinder
Inside liner 13 and bottom plate 15 are welded to connect, so as to form each independent air intake passage.External elements air edge first
Horizontal direction enters 14 horizontal segment of air intake pipe, flows straight down then along air intake pipe 14, finally by being provided with
The ring cavity region that the air inlet of 13 bottom of lining enters back into car for spent fuel storage tank and silo inside liner 13 is constituted, and pass through outlet air choma
Seat 11 flows out.
In cylinder lining after the structural body welding fabrication of 13, bottom plate 15 and 14 three parts of air intake pipe composition, in entire cylinder
Then assembling reinforcement outside storehouse, fixing concrete silo cylindrical die carry out concreting and maintenance molding, ultimately form
Hollow cylindrical reinforced concrete cylinder 16.
It is double L-shaped annulus module that air outlet ring seat 11, which is independent section, is inserted air outlet ring seat 11 by bolt hole
Enter the pre-buried screw rod in 16 top of concrete tube, air outlet ring seat 11 and concrete tube 16 are mutually permanently connected by bolt.Together
When, the pre-buried screw rod in the skirt of air outlet ring seat 11, by the way that top cover 12 skirt bolt hole is inserted into pre embedded bolt, by top cover 12
It is bolted to connection with air outlet ring seat 11.Air outlet ring seat 11 is by concrete material pouring molding, it is preferred that outside can
Steel plate is taken to be coated.
Air outlet ring seat 11 takes " concave " labyrinth type air flow channel to design, while each ventilation opening is arranged lead to face-to-face inwardly
Wind, ventilation hole are divided into upper layer and lower layer.Top cover 12 is the cylindrical concrete soil structure equipped with skirt and circular conical surface, is seated concrete
16 top of cylinder, is fixedly connected by bolt with air outlet ring seat 11.The skirt of top cover 12 is divulged information by air outlet ring seat upper layer and lower layer
Runner is isolated, and the lower layer for initially entering air outlet ring seat 11 along the air between car for spent fuel storage tank and inside liner ring cavity is empty
Flow channel then by spill runner, then is discharged into ambient atmosphere environment from the upper layer air flow channel of air outlet ring seat 11, from
And irradiated fuel assembly decay heat is persistently discharged by passive natural circulation.
During carrying out spentnuclear fuel loading reserved for operation, main technique scheme is described as follows:
Before carrying out car for spent fuel storage tank loading, the insertion concrete tube 16 of air outlet ring seat 11 is pushed up by bolt hole first
Portion's pre embedded bolt, bolt are fixedly connected；
Top cover 12 is removed by Special crane；
Adapter is installed at the top of air outlet module 11；
The mating transfer container for being mounted with car for spent fuel storage tank is lifted to adapter, and removes transhipment using adapter supporting plate
Container cover plate；
It reduces using crane lifting car for spent fuel storage tank and slowly, it is slowly lifted inside transfer container to concrete tube
Inside 16；And
Adapter is removed, top cover 12 is lifted to 11 step surface of air outlet module using Special crane, is fixed using bolt
Connection.
It is concrete silo shielding design schematic diagram shown in referring to figure 5..For vertical storage concrete silo, weary combustion
Material component is in vertical stored condition, and the upper tube seat of irradiated fuel assembly is located above, and bottom nozzle is located below.Due in spentnuclear fuel
The top of component fuel rod cavity is provided with holddown spring, therefore it is non-to belong to irradiated fuel assembly without filling pellet for the vertical region
Active section will not generate nuclear fission reaction in the region, no neutron and gamma-rays generate, and dose level of radiation is extremely low.To fill
Divide and utilize fuel assembly radiation shielding characteristics, shielding design includes three parts:
1. nonactive section of region of irradiated fuel assembly
Nonactive section of region of the holddown spring that concrete silo air inlet is set to irradiated fuel assembly upper end, concrete tube
Storehouse air inlet width be no more than irradiated fuel assembly upper end nonactive section of region of holddown spring, it is preferred that by concrete silo into
Air port is set to the corresponding height value in tube socket top on irradiated fuel assembly.
2. irradiated fuel assembly active section region
Nonactive for irradiated fuel assembly section of following region, loads fuel pellet generation fission reaction generation neutron and γ is penetrated
Line belongs to active section.For the active section region, in 360 ° of radial extensions, the heavy wall by integrated pouring molding is close
Real concrete layer carries out gamut shielding, and no any air flow channel with external elements perforation realizes concrete silo week
Border region shield effectiveness maximizes.
3. air outlet
Air outlet takes " concave " labyrinth type vent flow path, strengthens and shields to neutron and gamma ray, and air outlet is respectively positioned on
Face-to-face arrangement form is taken in the inside of ring seat 11, by internal concealed ventilation and face-to-face arrangement, further strengthens centering
Son and gamma ray shielding.
It please refers to shown in Fig. 6, in aeration structure design, is vertical concrete silo facade section, entirely divulged information
Journey is divided into seven sections, is respectively described below:
1) after car for spent fuel storage tank is placed in concrete tube 16, natural air initially enters air intake pipe in external environment
14 horizontal segment ventilation slot.
2) then, natural air enters back into air intake pipe 14 and combines each vertical section ventilation formed with silo inside liner 13
Slot flows straight down.
3) when reaching each vertical section ventilation trench bottom, natural air passes through the ventilation of 13 bottom of silo inside liner perforation
Hole, air-flow direction turn back 180 ° upwards again, the ring cavity region formed into car for spent fuel storage tank and silo inside liner 13.
4) natural air is after irradiated fuel assembly heats, along the ring cavity of car for spent fuel storage tank and the formation of silo inside liner 13
Region constantly flows up along vertical direction.
5) after reaching air outlet ring seat 12, the hot-air after heating, which is turned back 90 °, to be entered under air outlet ring seat 11
Layer horizontal air runner, then passes through the labyrinth type vent flow path of lower layer " L " type, turns back 90 ° and flow straight up.
6) hot-air after heating is turned back using 11 upper layer inverted "L" shape labyrinth type vent flow path of air outlet ring seat
90 ° flow along horizontal direction, are discharged by upper layer horizontal blank flow channel.
7) hot-air being discharged from 11 air outlet of air outlet ring seat is acted on by 11 circular conical surface wind-guiding of top cover, along vertical side
To flowing up, into ambient atmosphere environment, irradiated fuel assembly decay heat is persistently discharged by passive natural circulation.
It please refers to shown in Fig. 7-10, respectively 11 front of air outlet ring seat, the back side, vertical view and bottom view.Air outlet ring seat
11 are independent integral structure unit, for the hot-air between car for spent fuel storage tank and inside liner to be discharged from exhaust outlet, most
Enter ambient atmosphere environment eventually.Air outlet ring seat 11 is respectively by outer sleeve 111, inner sleeve 112, upper layer cushion block 113, lower layer's cushion block
114, bolt fixing hole 115 and top cover standing screw 116 form.Outer sleeve 111 and inner sleeve 112 are that section is the one of L-type
Body annulus.Upper layer cushion block 113 shares 5, and the center of circle surround and is uniformly distributed, between outer sleeve 111 and inner sleeve 112, shape
At 5 upper layer ventilation openings.Lower layer's cushion block 114 shares 5, and the center of circle is located at 112 lower end of inner sleeve around being uniformly distributed, and
Vertically position is identical with upper layer cushion block 113, forms one-to-one 5 lower layer's ventilation openings.Generally, pass through outer sleeve
111, the common combination of inner sleeve 112, upper layer cushion block 113 and lower layer's cushion block 114 forms " concave " labyrinth type air flow channel,
I.e. ring cavity hot inside air initially enters 5 lower layer's ventilation openings, recessed subsequently into constituting between outer sleeve 111, inner sleeve 112
Shape air flow channel, then be discharged from 5 upper layer ventilation openings.
The bolt fixing hole 115 of air outlet ring seat shares 5, while having run through skirt and the lower layer's cushion block of inner sleeve 112
114, the center of circle is bolted hole 115 16 tops of the insertion of air outlet ring seat 11 concrete tube are pre-buried around being uniformly distributed
Then screw rod tightens bolt, be mutually permanently connected and (please refer to Figure 11) air outlet ring seat 11 and concrete tube 16.
Top cover standing screw 116 shares 5, and screw rod lower end is pre-buried to inside the skirt of inner sleeve 112, and the center of circle is around uniform
Top cover 12 is inserted into top cover standing screw 116 by 12 skirt bolt fixing hole 125 of top cover, by top cover 12 and air outlet by distribution
Ring seat 11 is mutually permanently connected.
It please refers to shown in Figure 12 and Figure 13, is silo top cover overall construction drawing and construction profile.Silo top cover 12 is outer
Portion is by steel plate welding fabrication, the integrated component of internal filling plain concrete, respectively by top wind-guiding platform 121, changeover portion wind-guiding
Platform 122, skirt 123, bottom rotary table 124 and 125 5 part of bolt fixing hole composition.Entire top cover on skirt 123 by being provided with
5 run through aperture, the threaded metal bar being embedded on 11 step surface of air outlet ring seat, then using bolt by top cover 12 and outlet air
Choma seat 11 is fixedly connected.Since skirt 123, bottom rotary table 124 are fixedly connected with air outlet ring seat 11, under outlet air ring seat 11
Layer ventilation opening and upper layer ventilation opening it is mutually isolated (referring to Figure 1 4) so that between in basin and cylinder lining ring cavity gas along
Spill labyrinth type air flow channel constant flow inside outlet air ring seat 11.The group of top wind-guiding platform 121 and changeover portion wind-guiding platform 122
It closes structure and assumes responsibility for the 360 ° of directions dispersion diversion function for air outlet ring seat 11 being discharged air, avoid 11 top of air outlet ring seat
" face-to-face " air draft is issuable inwardly interferes with each other for each ventilation opening, guarantees that irradiated fuel assembly decay heat is discharged in top outlet inlet
Air flow stability.Wherein, circular conical surface wind-guiding platform 122 is pyramid type terrace with edge structure, the circular conical surface set up and bottom plane
Between angle be 30 ° to 60 ° so that air changes the direction for transitting to and tilting upward from horizontal direction, then pass through top again
The wind-guiding of portion's wind-guiding platform 121 acts on, so that air-flow direction final adjustment is vertical direction.
It please refers to shown in Figure 15 to Figure 17, is concrete silo main body steel skeleton construction schematic diagram, sectional view and vertical view knot
Composition, it is made of 13, air intake pipe 14, bottom plate 15 in cylinder lining.In cylinder lining 13 be seated metal base plate 15 it
On, the two welded connecting constitutes bulk metal structure.Air intake pipe 14 connects in cylinder lining 13 and the welding of bottom plate 15 respectively
It connects, so as to form each independent air intake passage.The knot of 13, bottom plate 15 and 14 three parts of air intake pipe composition in cylinder lining
After structure body welding fabrication, then the assembling reinforcement outside entire silo, fixing concrete silo cylindrical die carries out concrete
Molding is poured and conserved, hollow cylindrical reinforced concrete cylinder 16 is ultimately formed.Wherein, the horizontal segment of air intake pipe 14
Concrete barrel 16 is run through, to ensure that external elements air can enter concrete silo.
It please refers to shown in Figure 18, is silo steel skeleton inner ventilation schematic diagram.When car for spent fuel storage tank is freely located at bottom plate
During 15 store for a long time, air ring cavity is formd between car for spent fuel storage tank and inside liner 13.External natural air edge first
Horizontal direction enters each 14 horizontal segment of air intake pipe, flows straight down then along each air intake pipe 14, finally by opening up
Air inlet in 13 bottom of inside liner enters back into the ring cavity region that car for spent fuel storage tank is constituted with silo inside liner 13 and flows straight up
It is dynamic, irradiated fuel assembly decay heat is persistently exported.
It please refers to shown in Figure 19, is structural schematic diagram in cylinder lining, inside liner 13 is by shell 131, the fixed support of basin
132 and bottom air inlet mouth 133 form.Shell 131 is hollow thick-walled metal cylinder, passes through roller by stainless steel or carbon steel sheet
Circle is welded to form.It is equipped with the air inlet 133 of perforation in 131 bottom of shell, bottom air inlet mouth 133 shares 5, and the center of circle is around equal
Even distribution, each bottom air inlet mouth 133 collectively form complete air inlet air stream with each independent air inlet piping lane 14
Road.In the inner wall upper end of shell 131, it is equipped with the fixed support 132 of car for spent fuel storage tank, fixed support 132 shares 5, logical with shell
Welded connecting is crossed, the center of circle undertakes car for spent fuel storage tank lifting into the guide function during concrete silo around being uniformly distributed
Store fixed support function for a long time with car for spent fuel storage tank.
Referring to figure 2. shown in 0,132 structural schematic diagrams are supported to be fixed, by two blocks of mutually isostructural side plates 1321 and even
Fishplate bar 1322 forms.To prevent basin lifting from entering in concrete silo internal procedure, may be touched with silo inside liner 13
Hitting causes tank structural deformation impaired, and side plate 1321 takes wedge structure design, and shape is right-angled trapezium, certain by being arranged
Gradient (clapboard at the top of angle≤30 °), realize the vertical lifting guide function of car for spent fuel storage tank.Connecting plate 1322 with
Two blocks of side plates 1321 are fixedly connected by welding, pass through 5 fixed supports, 132 pairs of car for spent fuel storage tank rings in the horizontal direction
To constraint (referring to Figure 1 7), prevent from causing to store since car for spent fuel storage tank is subjected to displacement in the horizontal direction under earthquake accident conditions
The impaired rupture of jar structure generates radioactive substance leakage.
It is 14 structural schematic diagram of air intake pipe and sectional view, air intake pipe 14 is by level referring to figure 2. shown in 1 and Figure 22
Blast pipe 141, flase floor 142 and vertical air intake duct 143 form.Horizontal blast pipe 141 and vertical air intake duct 143 are solid by welding
Fixed connection, horizontal blast pipe 141 are fixedly connected by welding with shell, and vertical air intake duct 143 passes through welding with shell and bottom plate
It is fixedly connected, forms 5 mutually independent air inlet runners.Flase floor 142 is nested in inside horizontal blast pipe 141, to prevent
Blocking is generated in horizontal air hose influences concrete silo gravity-flow ventilation.
It is horizontal 141 structural schematic diagram of blast pipe (front and back side) referring to figure 2. shown in 3.Horizontal blast pipe 141 is flat
Rhs-structure, be made of four sides steel plate butt welding, wherein the left and right sides be rectangular steel plates, upper and lower two sides steel plate front and back end is arc
Shape.For upside steel plate, the corresponding diameter of front end circular arc and the outer diameter of entire concrete silo and bottom plate 15 it is identical, after
Hold the corresponding diameter of circular arc identical as the outer diameter of silo inside liner (please also refer to Figure 16).For downside steel plate, front end circle
Identical, the corresponding diameter of rear end circular arc and the vertical circle of the corresponding diameter of arc and the outer diameter of entire concrete silo and bottom plate 15
The corresponding diameter of arc ventilation slot is identical.
It is vertical 143 structural schematic diagram of air intake duct (front and back side) referring to figure 2. shown in 4.Vertical air intake duct 143 is by three faces
Steel plate butt welding composition, wherein the left and right sides is rectangular steel plates, centre is curved plate, wherein the corresponding arc diameter of curved plate
Diameter corresponding with horizontal 141 downside steel plate rear end circular arc of blast pipe is identical.
It is grating board structure schematic diagram referring to figure 2. shown in 5, flase floor is made of lateral partitions and longitudinal baffle.Wherein
Longitudinal baffle is multilayer, and lateral partitions are single-layer or multi-layer.Partition front and back end is circular shape, and with before and after horizontal blast pipe
End keeps flushing.Nested one group of flase floor inside each horizontal blast pipe.
6 to shown in Figure 28 referring to figure 2., respectively concrete tube structural schematic diagram, sectional view and bottom view.Concrete tube
16 undertake the structural defence function and radiation shield function to car for spent fuel storage tank.Concrete tube 16 is integrated pouring molding
Reinforced concrete structure unit is fixed by cylinder 161, horizontal air inlet hole 162, vertical air intake duct 163 and air outlet ring seat respectively
Screw rod 164 forms.
In specific pouring molding mode, concrete scheme is as follows:
Firstly, completing the welding fabrication of concrete silo main body steel skeleton construction, comprising: inside liner 13, air intake pipe 14
With bottom plate 15；Preferably, reinforcing bar binding is completed outside silo main body steel skeleton；
Using 15 circumference of bottom plate and the corresponding circular arc of horizontal blast pipe 141 as boundary, outside main body steel skeleton and assembling reinforcement
The supporting that portion completes cylindrical form is fixed.
From the downward continuous concrete in the top of cylindrical form, successively vibrate, maintenance molding.
According to above-mentioned concrete silo pouring plan, concrete tube inner wall be combined with each other with 121 outer wall of shell, concrete tube
The horizontal blast pipe 141 of horizontal air inlet hole 162 and air intake pipe be combined with each other, the vertical air inlet hole 163 of concrete tube and blast pipe
The vertical air intake duct 143 of corridor be combined with each other.
In conjunction with can be seen that compared with the existing technology to the detailed description of technical solution of the present invention above, nuclear power of the present invention
Spentnuclear fuel Dry storage of standing at least is had following technical effect that with concrete silo
In terms of radiation shield: sufficiently combining irradiated fuel assembly vertical " nonactive section " and " active section " radiation dose rate point
Cloth inherent characteristic, by being arranged air inlet at the top of irradiated fuel assembly fuel rod in " nonactive section " corresponding altitude range,
Realize air outlet area radiation dosage level minimum.For other " active section " regions of irradiated fuel assembly fuel rod, pass through
Heavy wall concrete carries out gamut shielding, realizes radiation screening effect maximization.It is designed based on above-mentioned radiation shielding structure, it can
Concrete silo neighboring area dose level of radiation is reduced to the greatest extent, and the radiation of concrete silo bottom workspace is effectively reduced
Dosage level, so that staff's exposure dosage is substantially during carrying out irradiated fuel store technological operation and Daily Round Check
It reduces.
Further, since air outlet runner takes " concave " labyrinth to design, while air outlet takes the medial surface pair covered entirely
Face Design of ventilation utmostly reduces concrete silo top air outlet region neutron and gamma-ray sky scattering and to weary combustion
Expect that storage technology operation and the radiation of Daily Round Check staff are irradiated.
In terms of core security: since air inlet is located at equipment elevated areas, eliminating existing concrete silo low level air inlet and hold
It is subject to external attack to destroy, to influence high radioactivity class nuclear material (irradiated fuel assembly) entity defendance security risk.
Structure secure context: it since concrete silo inside liner is provided with circumferential fixed support, realizes and spentnuclear fuel is store
Tank horizontal direction displacement constraint, preventing existing car for spent fuel storage tank from colliding in the case where earthquake accident conditions are without restriction mode with silo may
Caused basin deformation is damaged.
It is understood that according to actual needs, the knot of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo of the present invention
Structure can also carry out adjustment and change appropriate, specific as follows: 1) planform of piping lane of divulging information and quantity can be according to reality
It needs to be adjusted, such as: the blast pipe of horizontal linear shape is adjusted to elbowOr other bending nonlinear type air inlets
Pipe；By increasing by one of steel plate, vertical ventilation slot (3 face steel plate) is adjusted to vertical ventilation duct (4 face steel plate)；It increases or decreases
The quantity of ventilation piping lane；2) concrete silo main body steel skeleton construction type of attachment can change according to actual needs, such as: it will
Inside liner, ventilation piping lane and pedestal carry out firmware with bolt by using mating fastener and connect；3) silo inside liner basin is solid
Surely the structure and quantity supported can adjust according to actual needs, such as: increase the length of fixed support, maximum length is extensible
To bottom plate；Increase or decrease the quantity of fixed support；4) the structure design of air outlet module can change according to actual needs, example
Such as: changing top cover loopful and designed to enclosed construction, notch is set between each top outlet inlet；5) knot of top cover diversion platform
Configuration formula can change according to actual needs, such as: circular conical surface diversion platform and cylindric diversion platform are adjusted to integrated ball
Face groove structure.
According to above-mentioned principle, the present invention can also be made appropriate changes and modifications to the above embodiments.Therefore, this hair
Bright to be not limited to specific embodiment disclosed and described above, modifications of the present invention and change should also be as falling into of the invention
In scope of protection of the claims.In addition, although using some specific terms in this specification, these terms are only
Facilitate explanation, does not limit the present invention in any way.
Claims (10)
1. a kind of Nuclear Power Station's Exhausted Fuels Dry storage concrete silo characterized by comprising
Bottom plate；
It in hollow cylindrical cylinder lining, is fixedly connected on bottom plate, bottom is equipped with air inlet in cylinder lining；
Concrete tube is arranged in cylinder lining；And
Air outlet ring seat and top cover, are installed on concrete tube；
Wherein, concrete silo is additionally provided with air intake pipe, and air intake pipe is non-live at the top of irradiated fuel assembly fuel rod including being set to
Property section region horizontal segment and along concrete tube short transverse extend vertical section, external elements air is in the horizontal direction
It into the horizontal segment of air intake pipe, is flowed straight down then along air intake pipe, finally by being provided with inside liner bottom
The ring cavity region that air inlet enters car for spent fuel storage tank and silo inside liner is constituted, and flowed out through air outlet ring seat.
2. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that the outlet air
Choma seat inner sidewall is equipped with recessed portion, and the top cover is equipped with skirt, and skirt extends into recessed portion and is set in distance, by outlet air
Choma seat upper layer and lower layer vent flow path is isolated.
3. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that air inlet is set
It is placed in nonactive section of region of holddown spring of irradiated fuel assembly upper end, concrete silo air inlet width is no more than irradiated fuel assembly
Nonactive section of region of the holddown spring of upper end.
4. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that concrete tube
It is shielded by integrated pouring molding and to irradiated fuel assembly gamut.
5. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that the outlet air
Choma seat is equipped with vertical " concave " labyrinth type vent flow path, and air outlet is respectively positioned on the inside of ring seat, takes face-to-face arrangement form,
Pass through internal concealed ventilation and face-to-face arrangement.
6. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that the air inlet
Piping lane includes horizontal blast pipe, the flase floor being nested in inside horizontal blast pipe and vertical air intake duct, horizontal blast pipe and vertical
Air intake duct is fixedly connected by welding, and is fixedly connected by welding in horizontal blast pipe and cylinder lining, vertical air intake duct and cylinder
Internal lining and bottom plate are fixedly connected by welding, and form air inlet runner.
7. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that around described
Multiple independent of one another and air inlet runner is equipped in cylinder lining, each air inlet runner surrounds to be uniformly distributed in cylinder lining.
8. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that the silo
Top cover is equipped with pyramid type prismatic table shape wind-guiding platform, and the angle between the circular conical surface and bottom plane of wind-guiding platform is 30 ° to 60 °.
9. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 1, which is characterized in that the cylinder
Inside liner is equipped with the fixed support of wedge shape, and the fixed support of wedge shape includes two blocks of wedge-shaped side plates and connecting plate, the top folder of wedge-shaped side plate
Angle≤30 °.
10. Nuclear Power Station's Exhausted Fuels Dry storage concrete silo according to claim 9, which is characterized in that the cylinder
Internal lining is equipped with the fixed support of multiple wedge shapes, and the fixed support of wedge shape is uniformly distributed along the inner surface in cylinder lining.
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| CN201811207583.XA CN109448882A (en) | 2018-10-17 | 2018-10-17 | Nuclear Power Station's Exhausted Fuels Dry storage concrete silo |
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| CN201811207583.XA CN109448882A (en) | 2018-10-17 | 2018-10-17 | Nuclear Power Station's Exhausted Fuels Dry storage concrete silo |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111540495A (en) * | 2020-05-28 | 2020-08-14 | 中核环保产业有限公司 | Special device for preventing foreign matters in annular space of spent fuel dry-method storage sealed storage tank |
| US11393603B2 (en) * | 2020-03-23 | 2022-07-19 | Nac International Inc. | Thermal divider insert and method for spent nuclear fuel cask creating both air inlets and air outlets at the top of the overpack |
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| CN108335767A (en) * | 2018-01-31 | 2018-07-27 | 中广核工程有限公司 | Spent fuel dry-type storage horizontal type device |
| CN108417285A (en) * | 2018-02-06 | 2018-08-17 | 中国核电工程有限公司 | A kind of multiple labyrinth type fuel transfer tube shielding construction |
| CN108461167A (en) * | 2018-01-31 | 2018-08-28 | 中广核工程有限公司 | The vertical silo of spent nuclear fuel in nuclear power plant dry storage |
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| US4459260A (en) * | 1981-03-03 | 1984-07-10 | National Nuclear Corporation Limited | Dry storage of irradiated nuclear fuel |
| US4527067A (en) * | 1981-11-05 | 1985-07-02 | Deutsche Gesellschaft Fur Wiederaufarbeitung Von Kernbrennstoffen Mbh | Concrete shielding housing for receiving and storing a nuclear fuel element container |
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| US11393603B2 (en) * | 2020-03-23 | 2022-07-19 | Nac International Inc. | Thermal divider insert and method for spent nuclear fuel cask creating both air inlets and air outlets at the top of the overpack |
| CN111540495A (en) * | 2020-05-28 | 2020-08-14 | 中核环保产业有限公司 | Special device for preventing foreign matters in annular space of spent fuel dry-method storage sealed storage tank |
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