CN113571216A - Netted sandwich structure storage cavity for dense spent fuel storage and storage grillwork thereof - Google Patents
Netted sandwich structure storage cavity for dense spent fuel storage and storage grillwork thereof Download PDFInfo
- Publication number
- CN113571216A CN113571216A CN202110661210.5A CN202110661210A CN113571216A CN 113571216 A CN113571216 A CN 113571216A CN 202110661210 A CN202110661210 A CN 202110661210A CN 113571216 A CN113571216 A CN 113571216A
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- Prior art keywords
- storage
- net
- neutron absorption
- sandwich structure
- shaped
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- 238000003860 storage Methods 0.000 title claims abstract description 98
- 239000002915 spent fuel radioactive waste Substances 0.000 title claims abstract description 37
- 238000010521 absorption reaction Methods 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000005253 cladding Methods 0.000 claims abstract description 9
- 238000003466 welding Methods 0.000 claims abstract description 4
- 239000000446 fuel Substances 0.000 abstract description 20
- 239000000463 material Substances 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000010410 layer Substances 0.000 description 13
- 230000000712 assembly Effects 0.000 description 5
- 238000000429 assembly Methods 0.000 description 5
- 239000006096 absorbing agent Substances 0.000 description 4
- 239000011358 absorbing material Substances 0.000 description 4
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 239000002131 composite material Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 1
- 230000002285 radioactive effect Effects 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
Images
Classifications
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses a net-shaped sandwich structure storage cavity for dense storage of spent fuel and a storage framework thereof, wherein a net-shaped support (2) is arranged between two or more layers of neutron absorption plates (4) and is integrally arranged in a cavity formed by welding a neutron absorption cladding (1) and the storage cavity (3), and the net-shaped support (2) ensures water gaps among the neutron absorption plates (4) of each layer. The neutron absorption plate arrangement scheme of the mesh sandwich structure type neutron absorption plate with the mesh support structure is adopted, so that the fuel storage grillwork can realize more dense fuel storage, and meanwhile, the mesh support structure can bear the pressure perpendicular to the neutron absorption plate, so that the fuel storage grillwork has higher critical safety, better pool arrangement adaptability, lower neutron absorption material consumption and lower manufacturing cost.
Description
Technical Field
The invention belongs to the technical field of spent fuel, and particularly relates to the technical field of spent fuel storage or post-treatment.
Background
The spent fuel storage grillwork is used for storing the irradiated fuel assemblies and ensures that the stored fuel assemblies can meet subcritical requirements for all possible operation or accident conditions in the service life of the nuclear power station. Spent fuel assemblies discharged from the core are highly radioactive and will release heat continuously, requiring storage in a spent fuel pool for a certain period of time (typically 10 years) before they can be shipped for dry storage or reprocessing. At present, domestic dry-type fuel storage and post-treatment facilities are still imperfect, and spent fuel is mainly stored in a wet mode in a factory.
The storage space of the spent fuel pool in the nuclear power plant is limited, in order to reduce the increasing spent fuel storage pressure and increase the storage capacity of a spent fuel assembly, an intensive storage mode is generally adopted in a newly-built nuclear power plant, namely: the spacing between the storage compartments of the fuel storage grid is minimized. To prevent the spent fuel assembly from being critical, neutron absorbing material is also placed between adjacent storage cavities.
Under the current critical safety standard in China, dense storage of spent fuel is realized, namely storage cavities are arranged as much as possible in a limited space, and the distance between the storage cavities is reduced.
The invention discloses a reticular sandwich structure storage cavity for dense storage of spent fuel and a storage grid frame thereof, which are a neutron absorber structure for ensuring water gaps in a composite structure through structural arrangement optimization design characterized by a reticular support structure, and the neutron absorption effect is enhanced by using double or multiple neutron absorption sections. By adopting the spent fuel storage grillwork with the characteristics, the compact structure of the spent fuel storage grillwork can be kept, so that the design interval of the storage cavities is reduced as much as possible under the same size condition, the dense storage of spent fuel is realized, the critical safety requirement is met, the storage capacity of the spent fuel is improved, the using amount of neutron absorption materials is reduced, and the economic efficiency is high.
Disclosure of Invention
The invention provides a net-shaped sandwich structure storage cavity for dense storage of spent fuel and a storage grid thereof, namely two or more neutron absorption plates are arranged on each surface of the periphery of each storage cavity of the fuel storage grid, water layers are clamped among the neutron absorption plates, and net-shaped structures are adopted for supporting among the water layers. The fuel storage grid adopting the neutron absorption plate arrangement scheme can realize more dense fuel storage, and has higher critical safety and relatively lower manufacturing cost.
The net-shaped sandwich structure storage cavity for dense storage of the spent fuel is characterized in that net-shaped supports (2) are arranged between two or more layers of neutron absorption plates (4) and integrally arranged in a cavity formed by welding the neutron absorption cladding (1) and the storage cavity (3), and the net-shaped supports (2) ensure water gaps among the neutron absorption plates (4) of each layer.
The net-shaped sandwich structure storage grillwork for the dense storage of the spent fuel consists of a plurality of net-shaped sandwich structure storage cavities for the dense storage of the spent fuel, the net-shaped sandwich structure storage cavities (8) for the dense storage of the spent fuel are arranged at intervals in a checkerboard manner, the edge cavities (7) of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure are arranged at the edge of the storage grillwork at intervals, the edge cavities (7) of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure and the net-shaped sandwich structure storage cavities (8) for the dense storage of the spent fuel are respectively welded and connected with a grillwork bottom plate (9), and the edge cavities (7) of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure and the net-shaped sandwich structure storage cavities (8) for the dense storage of the spent fuel are fixed by a connecting plate (10), the grid bottom plate (9) and the connecting plate (10) are welded.
Compared with the prior art, the invention has the following technical characteristics:
1) adopting a water gap composite board structure, wherein the middle layer is a water-filled net-shaped support structure layer;
2) the neutron absorbing material layers are arranged on the two sides of the middle layer, and the surface layer thickness with the strongest absorption capacity of the neutron absorbing material and the moderating effect of water can be effectively utilized by utilizing multiple interfaces of the neutron absorbing material and the mesh-structure water gap layer;
3) the water gap thickness, the neutron absorption plate thickness and the number (layer number) can be adjusted to adapt to the storage of fuel assemblies with various enrichment degrees and burn-up depths;
4) the dosage of neutron absorption materials can be reduced under the same storage space, and the fuel storage capacity is improved while the economy is still high;
5) the grid with the structure can realize the full-pool storage of the fuel assemblies without additional operation management and control measures.
Drawings
FIG. 1 is a schematic view of an arrangement of a reticulated sandwich structural neutron-absorption plate with a reticulated support structure according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a reticulated sandwich structural neutron-absorption plate having a reticulated support structure in accordance with an embodiment of the invention;
wherein, 1-neutron absorption plate cladding, 2-reticular support, 3-storage cavity and 4-neutron absorption plate;
FIG. 3 is a front view of a reservoir of a typical reticulated sandwich structural neutron-absorber plate structure with a reticulated support structure;
FIG. 4 is a top plan view of a reservoir of a typical reticulated sandwich structural neutron-absorber plate structure with a reticulated support structure;
wherein, 5-fuel storage cavity, 6-neutron absorption plate and cladding;
FIG. 5 is a partial plan view of a fuel storage lattice employing a reticulated sandwich structural neutron-absorption plate of the present invention having a reticulated support structure;
wherein, the neutron absorber comprises 7-a side cavity of a reticular sandwich structure neutron absorption plate with a reticular support structure, 8-a reticular sandwich structure storage cavity for dense spent fuel storage, 9-a grid bottom plate and 10-a connecting plate.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1, the net sandwich-structured neutron-absorption plate structure with a net-shaped support structure in the invention is composed of two or more layers of neutron-absorption plates 4, a net-shaped support 2, a neutron-absorption plate cladding 1 and a storage cavity 3. And a reticular support is arranged between two or more layers of neutron absorption plates and is integrally arranged in a cavity formed by welding the neutron absorption cladding and the storage cavity, and the reticular support ensures water gaps among the neutron absorption plates of each layer.
As shown in fig. 2 and 3, a typical storage chamber of a mesh sandwich type neutron absorption plate with a mesh support structure is composed of a fuel storage chamber 5 and 4 mesh sandwich type neutron absorption plates with a mesh support structure and a cladding 6, and the neutron absorption plates and the cladding 6 are welded with the fuel storage chamber 5.
The fuel storage grillwork is composed of a plurality of net-shaped sandwich structure storage cavities for dense storage of the spent fuel, the net-shaped sandwich structure storage cavities 8 for dense storage of the spent fuel are arranged at intervals in a checkerboard manner, the edge cavities 7 of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure are arranged at the edge of the storage grillwork at intervals, the edge cavities 7 of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure and the net-shaped sandwich structure storage cavities 8 for dense storage of the spent fuel are respectively welded and connected with a grillwork bottom plate 9, the edge cavities 7 of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure and the net-shaped sandwich structure storage cavities 8 for dense storage of the spent fuel are fixed by connecting plates 10, and the bottom plate 9 and the connecting plates 10 are welded to form the grillwork.
The invention adopts the neutron absorption plate arrangement scheme of the reticular sandwich structure type neutron absorption plate with the reticular support structure, so that the fuel storage framework can realize more dense fuel storage, and meanwhile, the reticular support structure can bear the pressure vertical to the neutron absorption plate, thereby having higher critical safety, better pool arrangement adaptability, lower neutron absorption material consumption and lower manufacturing cost.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations. The foregoing examples or embodiments are merely illustrative of the present invention, which may be embodied in other specific forms or in other specific forms without departing from the spirit or essential characteristics thereof. The described embodiments are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention should be indicated by the appended claims, and any changes that are equivalent to the intent and scope of the claims should be construed to be included therein.
Claims (2)
1. The storage cavity with the net-shaped sandwich structure for the dense storage of the spent fuel is characterized in that a net-shaped support (2) is arranged between two or more layers of neutron absorption plates (4) and is integrally arranged in a cavity formed by welding a neutron absorption cladding (1) and the storage cavity (3), and the net-shaped support (2) ensures water gaps among the neutron absorption plates (4) of each layer.
2. The net-shaped sandwich structure storage grid for dense spent fuel storage is characterized in that the storage grid is composed of a plurality of net-shaped sandwich structure storage cavities for dense spent fuel storage according to claim 1, the net-shaped sandwich structure storage cavities (8) for dense spent fuel storage are arranged at intervals in a checkerboard manner, the edge cavities (7) of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure are arranged at the edge of the storage grid at intervals, the edge cavities (7) of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure and the net-shaped sandwich structure storage cavities (8) for dense spent fuel storage are respectively welded and connected with a grid bottom plate (9), the edge cavities (7) of the net-shaped sandwich structure neutron absorption plate with the net-shaped supporting structure and the net-shaped sandwich structure storage cavities (8) for dense spent fuel storage are fixed by connecting plates (10), the grid bottom plate (9) and the connecting plate (10) are welded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110661210.5A CN113571216A (en) | 2021-06-15 | 2021-06-15 | Netted sandwich structure storage cavity for dense spent fuel storage and storage grillwork thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110661210.5A CN113571216A (en) | 2021-06-15 | 2021-06-15 | Netted sandwich structure storage cavity for dense spent fuel storage and storage grillwork thereof |
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| Publication Number | Publication Date |
|---|---|
| CN113571216A true CN113571216A (en) | 2021-10-29 |
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|---|---|---|---|
| CN202110661210.5A Pending CN113571216A (en) | 2021-06-15 | 2021-06-15 | Netted sandwich structure storage cavity for dense spent fuel storage and storage grillwork thereof |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0868890A (en) * | 1994-08-30 | 1996-03-12 | Hitachi Ltd | Spent fuel storage rack and spent fuel storage equipment |
| WO1999007001A1 (en) * | 1997-07-31 | 1999-02-11 | Siemens Aktiengesellschaft | Absorbing element, method for making said element, storage rack for fuel elements and neutron-absorbing material |
| JP2004271435A (en) * | 2003-03-11 | 2004-09-30 | Mitsui Eng & Shipbuild Co Ltd | Containment for spent nuclear fuel assembly |
| CN105931687A (en) * | 2016-06-14 | 2016-09-07 | 中国核电工程有限公司 | Spent fuel storage cell |
| CN206619406U (en) * | 2017-02-28 | 2017-11-07 | 上海核工程研究设计院 | A kind of standby neutron-absorbing component of spent fuel storage rack |
| JP2019158398A (en) * | 2018-03-08 | 2019-09-19 | 日立Ｇｅニュークリア・エナジー株式会社 | Spent fuel storage container |
| JP2019158399A (en) * | 2018-03-08 | 2019-09-19 | 日立Ｇｅニュークリア・エナジー株式会社 | Spent fuel storage container |
-
2021
- 2021-06-15 CN CN202110661210.5A patent/CN113571216A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0868890A (en) * | 1994-08-30 | 1996-03-12 | Hitachi Ltd | Spent fuel storage rack and spent fuel storage equipment |
| WO1999007001A1 (en) * | 1997-07-31 | 1999-02-11 | Siemens Aktiengesellschaft | Absorbing element, method for making said element, storage rack for fuel elements and neutron-absorbing material |
| JP2004271435A (en) * | 2003-03-11 | 2004-09-30 | Mitsui Eng & Shipbuild Co Ltd | Containment for spent nuclear fuel assembly |
| CN105931687A (en) * | 2016-06-14 | 2016-09-07 | 中国核电工程有限公司 | Spent fuel storage cell |
| CN206619406U (en) * | 2017-02-28 | 2017-11-07 | 上海核工程研究设计院 | A kind of standby neutron-absorbing component of spent fuel storage rack |
| JP2019158398A (en) * | 2018-03-08 | 2019-09-19 | 日立Ｇｅニュークリア・エナジー株式会社 | Spent fuel storage container |
| JP2019158399A (en) * | 2018-03-08 | 2019-09-19 | 日立Ｇｅニュークリア・エナジー株式会社 | Spent fuel storage container |
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Applicant before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE Co.,Ltd. |