CN110534217B - Spent fuel storage grillwork for ocean nuclear power platform - Google Patents
Spent fuel storage grillwork for ocean nuclear power platform Download PDFInfo
- Publication number
- CN110534217B CN110534217B CN201910848796.9A CN201910848796A CN110534217B CN 110534217 B CN110534217 B CN 110534217B CN 201910848796 A CN201910848796 A CN 201910848796A CN 110534217 B CN110534217 B CN 110534217B
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- spent fuel
- storage
- plate
- nuclear power
- fuel storage
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Classifications
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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
- G21C19/07—Storage racks; Storage pools
-
- 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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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel Cell (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to a spent fuel storage grid for a marine nuclear power platform, which comprises a top plate, a bottom plate and a plurality of hollow storage cells, wherein the periphery of the top plate and the periphery of the bottom plate are connected and supported by a coaming, the top plate and the bottom plate are respectively provided with a plurality of mounting holes, the storage cells are arranged in the coaming, and the upper part and the lower part of the storage cells are respectively and correspondingly arranged in the mounting holes of the top plate and the bottom plate.
Description
Technical Field
The invention relates to a spent fuel storage device, in particular to a spent fuel storage grid for a marine nuclear power platform.
Background
The amount of fissile material is limited by the uranium enrichment of the reactor fuel assembly, the period of the fissile reaction is eventually reached, and the pressure of the fissile product in the fuel cladding is generated by expansion and deformation of the fuel element, and when the fuel element reaches the required burning time, the fuel element must be taken out of the reactor core and replaced by new fuel, so that the reactor can continuously output power to the outside. The spent fuel assembly discharged from the reactor can still generate critical decay heat to a certain extent, the risk of nuclear accident exists, and the spent fuel assembly has high radioactivity, so that an effective spent fuel storage grid is required to be designed to ensure the storage safety of the spent fuel assembly. The spent fuel stored in the ocean environment is affected by the roll, pitch, roll, pitch and heave all the time, so that there is a higher demand for the design of the spent fuel storage grillwork.
The application of various types of spent fuel storage grillwork from the first period of Qinshan to Hualong first period of China considers that spent fuel assemblies are stored on land, the severe limit working condition is an earthquake working condition, the storage safety of the spent fuel assemblies is guaranteed under the condition of high-frequency vibration in a short time, but the marine environment is always in swinging, no stop is needed, and the safe storage of the spent fuel assemblies under the marine environment cannot be met by the existing spent fuel storage grillwork structural form and installation mode. Meanwhile, related data show that the international related ocean nuclear power plant does not consider the storage of the spent fuel assemblies in the ocean environment at present, the storage of the spent fuel assemblies is carried out on an ocean nuclear power plant guarantee base or a refueling wharf, the storage requirement is completely consistent with that of an onshore commercial nuclear power plant, and the design of a spent fuel storage grid is not changed obviously. The only case of the spent fuel assembly in the marine environment at present is the transportation process of the spent fuel assembly, namely the process of transporting the spent fuel to a post-treatment plant through a special ship after decay heat and radioactivity of the spent fuel are reduced to a certain degree after long-term storage, and the spent fuel assembly with lower decay heat and radioactivity is positioned in a spent fuel transportation container.
From the above, in the case where the spent fuel assembly is stored in a sea environment which is swayed at any moment, the existing spent fuel storage grillwork cannot safely store the spent fuel assembly in the sea environment, and the risk of occurrence of nuclear safety accidents is excessive, so that the spent fuel storage grillwork capable of being stored for a long time in the sea environment needs to be designed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the spent fuel storage grillwork for the ocean nuclear power platform, which can meet the requirement of safely storing the spent fuel assembly in the ocean environment with shaking at any time.
The technical scheme adopted for achieving the purpose of the invention is that the spent fuel storage grid for the ocean nuclear power platform comprises a top plate, a bottom plate and a plurality of hollow storage cells, wherein the periphery of the top plate and the periphery of the bottom plate are connected and supported through coamings, the top plate and the bottom plate are respectively provided with a plurality of mounting holes, the storage cells are arranged in the coamings, and the upper part and the lower part of the storage cells are respectively and correspondingly arranged in the mounting holes of the top plate and the bottom plate.
In the technical scheme, the upper part of the storage small chamber is provided with the arched buffer piece protruding outwards, and the arched buffer piece is embedded into the mounting hole of the top plate.
In the above technical solution, the opening aperture at the top end of the storage small chamber gradually increases from top to bottom to form a bell mouth structure.
Further, the spent fuel storage grillwork for the ocean nuclear power platform further comprises a screw sleeve, the screw sleeve comprises a fixed ring provided with internal threads and a hollow screw rod, the fixed ring is fixedly arranged on the bottom plate, the bottom end of the storage small chamber is fixedly connected with the fixed ring, and the hollow screw rod is fixedly connected with the fixed ring through threads after penetrating through the mounting hole of the bottom plate.
Furthermore, the storage small chamber is square, and the bottom screw sleeve is round, so that an outer square and inner round structure is formed.
In the above technical scheme, the inner side of the hollow screw rod top end is provided with an inclined plane, and the inclined plane forms a setting surface obliquely upwards.
In the technical scheme, the hollow screw is internally provided with the component fixing groove used for being connected with the fixing device on the spent fuel component.
In the above technical scheme, the storage cell is provided with a cladding body around, and a neutron absorber is arranged between the storage cell and the cladding body.
Further, the spent fuel storage grillwork for the ocean nuclear power platform further comprises a plurality of connecting blocks, a reinforcing plate is arranged at a position above the gravity center of the spent fuel storage grillwork for the ocean nuclear power platform, the reinforcing plate surrounds the spent fuel storage grillwork to be fixedly connected with the coaming, one side of each connecting block is connected with the reinforcing plate, and the other side of each connecting block is connected with a spring plate.
In the technical scheme, the bottom surface of the bottom plate is symmetrically provided with adjusting screws for adjusting levelness, and the upper surface of the top plate is symmetrically provided with lifting lugs.
Furthermore, the storage small chamber is square, and the bottom screw sleeve is round, so that an outer square and inner round structure is formed.
The spent fuel storage grillwork can realize long-term safe storage of the spent fuel assembly in a swinging and shaking marine environment; under the premise of ensuring that the spent fuel assembly is in subcritical and effective radiation protection and decay waste heat is smoothly led out, the fuel assembly is ensured not to be damaged under the condition of bearing marine environmental load for a long time under normal conditions.
Drawings
FIG. 1 is a schematic diagram of the structure of a spent fuel storage rack for a marine nuclear power platform of the present invention.
FIG. 2 is a schematic cross-sectional view of A-A of FIG. 1.
FIG. 3 is a schematic top view of a spent fuel storage rack for a marine nuclear power platform of the invention.
FIG. 4 is a schematic illustration of the connection of the storage chamber to the top plate in accordance with the present invention.
FIG. 5 is a schematic illustration of the connection of the sleeve to the base plate in the present invention.
In the figure: 1-a storage cell; 1.1-arched cushioning structures; 2-lifting lugs; 3-top plate; 4-connecting blocks; 5-spring plate; 6-reinforcing plates; 7-coaming; 8-neutron absorber; 9-cladding the plate; 10-a bottom plate; 11-adjusting the screw; 12-a screw sleeve; 12.1-a ramp-oriented support structure; 12.2-component securing grooves; 12.3-a fixing ring; 12.4-hollow screw.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in fig. 1, the spent fuel storage grillwork for the ocean nuclear power platform comprises a top plate 3, a bottom plate 10 and a plurality of hollow storage cells 1, wherein the peripheries of the top plate 3 and the bottom plate 10 are connected and supported with a coaming 7 through welding or screws and the like, the top plate 3 and the bottom plate 10 are respectively provided with a plurality of mounting holes, the storage cells are arranged in the coaming, and the upper part and the lower part of the storage cells 1 are respectively and correspondingly arranged in the mounting holes of the top plate 3 and the bottom plate 10.
As a preferred embodiment of the present invention, as shown in fig. 4, the upper part of the storage cell 1 is provided with an arch buffer structure 1.1 protruding outwards in the upper part of the storage cell 1, the arch buffer structure 1.1 is embedded in the mounting hole, the arch buffer structure 1.1 and the mounting mode thereof can fix the storage cell 1, in addition, under the condition that the storage cell and the fuel components in the storage cell are always shaken at sea, when the impact force of the fuel components in the storage cell is large, the arch buffer structure 1.1 can deform to play a role of buffering, and the spent fuel components stored in the single storage cell are protected. In order to facilitate the placement of the spent fuel assembly, the opening aperture at the top end of the storage small chamber 1 is gradually enlarged from top to bottom to form a horn mouth, and the inner surface of the horn mouth is a long-distance inclined plane for guiding the spent fuel assembly to enter the spent fuel storage grillwork so as to ensure that the spent fuel assembly can smoothly enter the designated storage small chamber even in the marine environment.
As a preferred embodiment of the present invention, the structure that the lower part of the storage cell 1 is disposed in the mounting hole of the bottom plate 10 is shown in fig. 5, the spent fuel storage grid for the ocean nuclear power platform of the present invention further comprises a screw sleeve 12, the screw sleeve 12 comprises a fixed ring 12.3 provided with internal threads and a hollow screw rod 12.4, wherein the fixed ring 12.4 is welded on the bottom plate 10, the bottom end of the storage cell 1 is welded with the fixed ring 12.3, and the hollow screw rod 12.4 is fixedly connected with the fixed ring 12.3 through threads after passing through the mounting hole of the bottom plate 10, thereby realizing the fixed connection of the storage cell 1 and the bottom plate 10.
The preferred structure of the hollow screw 12.4 is provided in this embodiment, specifically: the inside at cavity screw rod 12.4 top is equipped with inclined plane direction bearing structure 12.1, and this inclined plane direction bearing structure 12.1 forms a slope and upwards sets off the face, and after the spent fuel subassembly got into the storage cell, before the spent fuel subassembly is fixed, the spent fuel subassembly need reach a relative fixed position, sets up a direction inclined plane and is favorable to fixing the front location this moment, and this inclined plane also can be regarded as the holding surface of inside storage spent fuel subassembly simultaneously, owing to be the inclined plane, and the holding power is no longer perpendicular upwards, can not take place the displacement under the effect of receiving certain radial force. In addition, still be equipped with the subassembly fixed slot 12.2 that is used for being connected with the last fixing device of spent fuel subassembly in the cavity screw rod 12.4, subassembly fixed slot 12.2 cooperates with the last fixing device of spent fuel subassembly for fixedly store the spent fuel subassembly, guarantee that the spent fuel subassembly is fixed in the storage cell all the time under the marine environment, can not appear the spent fuel subassembly pine and take off, the drunkenness, avoid the spent fuel subassembly to appear damaging. Specifically, the fixing device on the spent fuel assembly is a telescopic spring hook structure, and the assembly fixing groove 12.2 clamps the spring hook structure to fix the spent fuel assembly from falling off.
In the invention, the periphery of the storage cell 1 is provided with the cladding 9, and a neutron absorber 8 is arranged between the storage cell 1 and the cladding 9, as shown in fig. 1 and 3, the neutron absorber 8 is used for absorbing neutrons emitted by decay of an internal storage spent fuel assembly, so as to ensure subcritical conditions, for example, the neutron absorber is Al-B 4 C cermet, when neutron absorber is Al-B 4 C cermet due to Al-B 4 C metal ceramic has poor processing performance, the arc plate is difficult to form, the whole storage chamber is square, and the Al-B can be used for preparing the ceramic 4 The C metal ceramic neutron absorber is arranged by four flat plates through the cladding plate.
As a preferred embodiment of the invention, the cross section of the storage small chamber is square, and the cross section of the bottom screw sleeve is round, so that an external square and internal round structure is formed, and the circular fuel assembly special for the ocean nuclear power platform can be conveniently stored.
The reinforcing plate 6 is connected to the position above the gravity center of the spent fuel storage grillwork through welding or screws, as shown in fig. 1 and 2, the reinforcing plate 6 surrounds the spent fuel storage grillwork for one circle and is fixedly connected with the coaming 7 through welding or screws and the like, and the reinforcing plate 6 is used for reinforcing the coaming of the spent fuel storage grillwork and also used for supporting a buffer mechanism of the spent fuel storage grillwork of the offshore spent fuel storage assembly. In order to further adapt to the sea environment with shaking moment, the spent fuel storage grillwork of the invention further comprises a plurality of connecting blocks 4, one side of each connecting block 4 is connected with a reinforcing plate 6, the other side of each connecting block is connected with a spring plate 5 through welding or screws, and the spring plates 5 are used for being extruded and elastically deformed after the spent fuel storage grillwork is affected by the sea environment and contacted with the external pool wall, so that pure mechanical resistance buffering is carried out, no additional power source is needed, the impact force of the whole spent fuel storage grillwork is reduced, and all spent fuel assemblies stored in the spent fuel storage grillwork are protected.
The bottom surface of the bottom plate 10 is symmetrically provided with leveling adjustment screws 11, for example, four corners of the bottom surface of the bottom plate 10 can be respectively provided with leveling adjustment screws 11 for adjusting the levelness of the spent fuel storage grillwork in the installation process. Lifting lugs 2 for lifting the spent fuel storage grillwork of the invention are symmetrically arranged on the top plate 3, as shown in fig. 1 and 2. Each storage cell 1 has a through hole in the middle from top to bottom, such as a round hole shown in fig. 3, and the through hole is used for cooling water to enter the storage cell 1, so as to cool the spent fuel assembly stored in the storage cell, and enable the decay heat of the spent fuel assembly to be smoothly led out.
Claims (6)
1. A spent fuel storage grillwork for ocean nuclear power platform which characterized in that: the storage device comprises a top plate, a bottom plate, a threaded sleeve and a plurality of hollow storage small chambers, wherein the peripheries of the top plate and the bottom plate are connected and supported through coamings, the top plate and the bottom plate are respectively provided with a plurality of mounting holes, the storage small chambers are arranged in the coamings, and the upper parts and the lower parts of the storage small chambers are respectively and correspondingly arranged in the mounting holes of the top plate and the bottom plate; an arch buffer piece protruding outwards is arranged at the upper part of the storage small chamber, and the arch buffer piece is embedded into the mounting hole of the top plate; the screw sleeve comprises a fixed ring provided with internal threads and a hollow screw rod, the fixed ring is fixedly arranged on the bottom plate, the bottom end of the storage small chamber is fixedly connected with the fixed ring, and the hollow screw rod is fixedly connected with the fixed ring through threads after penetrating through the mounting hole of the bottom plate; an inclined plane is arranged on the inner side of the top end of the hollow screw rod, and forms a supporting surface obliquely upwards; and an assembly fixing groove used for being connected with the fixing device on the spent fuel assembly is formed in the hollow screw.
2. The spent fuel storage rack for a marine nuclear power platform of claim 1, wherein: the aperture of the opening at the top end of the storage small chamber gradually increases from top to bottom to form a horn mouth structure.
3. The spent fuel storage rack for a marine nuclear power platform of claim 2, wherein: the storage small chamber is square, the bottom screw sleeve is round, and an outer square and inner round structure is formed.
4. A spent fuel storage rack for a marine nuclear power platform according to claim 3, wherein: the storage cell is provided with a cladding body around, and a neutron absorber is arranged between the storage cell and the cladding body.
5. The spent fuel storage rack for a marine nuclear power platform according to claim 4, wherein: the device comprises a spent fuel storage grillwork, a plurality of connecting blocks, a reinforcing plate and a spring plate, wherein the reinforcing plate is arranged at a position above the gravity center of the spent fuel storage grillwork, the reinforcing plate surrounds the spent fuel storage grillwork and is fixedly connected with the coaming, one side of each connecting block is connected with the reinforcing plate, and the other side of each connecting block is connected with the spring plate.
6. The spent fuel storage rack for a marine nuclear power platform according to claim 5, wherein: the bottom surface of bottom plate is equipped with the adjustment screw rod of adjustment levelness symmetrically, the upper surface of roof is equipped with the lug symmetrically.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910848796.9A CN110534217B (en) | 2019-09-09 | 2019-09-09 | Spent fuel storage grillwork for ocean nuclear power platform |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910848796.9A CN110534217B (en) | 2019-09-09 | 2019-09-09 | Spent fuel storage grillwork for ocean nuclear power platform |
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| Publication Number | Publication Date |
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| CN110534217A CN110534217A (en) | 2019-12-03 |
| CN110534217B true CN110534217B (en) | 2023-08-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910848796.9A Active CN110534217B (en) | 2019-09-09 | 2019-09-09 | Spent fuel storage grillwork for ocean nuclear power platform |
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| CN112599266A (en) * | 2020-11-24 | 2021-04-02 | 中国核电工程有限公司 | Spent fuel storage grillwork |
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2019
- 2019-09-09 CN CN201910848796.9A patent/CN110534217B/en active Active
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| Publication number | Publication date |
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| CN110534217A (en) | 2019-12-03 |
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