CN111599500A - Spent fuel storage grillwork of high security - Google Patents
Spent fuel storage grillwork of high security Download PDFInfo
- Publication number
- CN111599500A CN111599500A CN202010311410.3A CN202010311410A CN111599500A CN 111599500 A CN111599500 A CN 111599500A CN 202010311410 A CN202010311410 A CN 202010311410A CN 111599500 A CN111599500 A CN 111599500A
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- Prior art keywords
- spent fuel
- sleeve
- safety
- fuel storage
- circulation
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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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Fuel Cell (AREA)
- Structure Of Emergency Protection For Nuclear Reactors (AREA)
Abstract
The invention belongs to the technical field of spent fuel safety, and particularly relates to a high-safety spent fuel storage grillwork which comprises a plurality of storage grids which are separated by partition plates (2) and distributed in an array mode, wherein each storage grid is internally provided with a sleeve (1) used for storing a spent fuel assembly (5), the sleeve (1) is vertical to the ground, and the side wall of the sleeve (1) is provided with a plurality of circulation holes (6). According to the high-safety spent fuel storage grid frame provided by the invention, gas in the spaces of the storage units (3) and the interlayer (4) flows through the circulation holes (6) on the sleeve (1) to form a natural circulation to remove the residual heat of the exposed part of the spent fuel assembly (5), so that the spent fuel assembly (5) is cooled, the spent fuel assembly (5) is prevented from being melted to damage and a large amount of radioactivity is released, and the storage safety of the spent fuel assembly (5) is ensured.
Description
Technical Field
The invention belongs to the technical field of spent fuel safety, and particularly relates to a high-safety spent fuel storage grillwork.
Background
Spent nuclear fuel, also known as irradiated nuclear fuel, is spent nuclear fuel subjected to irradiation, usually produced by nuclear reactors of nuclear power plants, contains a large amount of radioactive elements and is therefore radioactive and, if not properly disposed of, can seriously affect the environment and the health of the persons in contact with them. After the accident of the nuclear power station in the fukushima of japan, the safety of the spent fuel pool has attracted wide attention in the nuclear power industry at home and abroad. After the spent fuel pool loses cooling, the residual heat of the spent fuel assembly causes the water in the spent fuel pool to evaporate, the water level drops, until the spent fuel assembly is exposed, the water in the spent fuel storage grillwork cannot form natural circulation, the exposed part of the spent fuel assembly only depends on internal steam to take away the residual heat, the heat exchange condition drops sharply, and finally the temperature of the spent fuel rises to be melted down, so that a large amount of radioactivity is released. Therefore, the spent fuel storage grillwork needs to be further improved to deal with the situation that the water level of the spent fuel pool is reduced.
Disclosure of Invention
The invention aims to provide a spent fuel storage grillwork with high safety, which can lead the exposed part of the spent fuel assembly to take away the residual heat by means of natural circulation of air, ensure the cooling of the spent fuel assembly and further ensure the safety of spent fuel storage.
In order to achieve the above purpose, the technical scheme adopted by the invention is a spent fuel storage grillwork with high safety, wherein the spent fuel storage grillwork comprises a plurality of storage grids which are separated by partition plates and distributed in an array manner, a sleeve for storing a spent fuel assembly is arranged in each storage grid, the sleeve is vertical to the ground, and a plurality of circulation holes are arranged on the side wall of the sleeve.
Further, a barrier layer capable of passing gas or liquid coolant is left between the sleeve and the partition plate.
Further, between the partition and the sleeve in each of the storage cells, the circulation of the coolant in a gas or liquid state can be achieved through the circulation holes in the side wall of the sleeve.
Furthermore, the circulation holes are uniformly arranged on the side wall of the sleeve from top to bottom.
Furthermore, the circulation hole is provided with the inclined hole in a mode of low outside and high inside, so that the circulation flow direction can be controlled conveniently, and the influence of the hole opening on shielding can be reduced.
Furthermore, the upper and lower positions of the circulation holes on two adjacent side walls of the sleeve are staggered, and the positions of the circulation holes on two opposite side walls are consistent.
Furthermore, the flow holes are provided with the flow guide pipes, so that the reverse resistance passing through the flow guide pipes is larger than the forward resistance, and the control of the natural circulation direction of air is facilitated.
Further, the sleeve has a heat insulation effect to ensure that air inside and outside the sleeve can form natural circulation under temperature difference.
Further, the separator contains a neutron absorbing material, which can prevent the spent fuel assembly from being critical.
The invention has the beneficial effects that:
the natural circulation is formed by the gas in the spaces of the storage unit 3 and the interlayer 4 flowing through the circulation holes 6 on the sleeve 1 to remove the exposed residual heat of the spent fuel assembly 5, so that the spent fuel assembly 5 is cooled, the spent fuel assembly 5 is prevented from being melted and damaged to release a large amount of radioactivity, and the storage safety of the spent fuel assembly 5 is ensured.
Drawings
Fig. 1 is a top view of a high-safety spent fuel storage lattice according to an embodiment of the present invention;
fig. 2 is a side sectional view (a-a, a sectional view including only a sleeve and a spent fuel assembly in a partition) of a 1 st embodiment of a high-safety spent fuel storage lattice according to an embodiment of the present invention;
fig. 3 is a side sectional view a-a of a 2 nd embodiment of a high safety spent fuel storage grid according to an embodiment of the present invention (including only a sleeve and spent fuel assembly within a spacer);
fig. 4 is a side sectional view (a-a sectional view and B-B sectional view, only including a sleeve and a spent fuel assembly in a partition) of a 3 rd version of a high-safety spent fuel storage grid according to an embodiment of the present invention;
in the figure: 1-sleeve, 2-baffle, 3-storage unit, 4-interlayer, 5-spent fuel assembly, 6-circulation hole, 7-coolant.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1 and 2, the spent fuel storage lattice frame with high safety provided by the invention comprises a plurality of storage lattices which are separated by partition plates 2 and distributed in an array, wherein each storage lattice is provided with a sleeve 1 for storing a spent fuel assembly 5, each sleeve 1 is used as a storage unit 3, the sleeve 1 is vertical to the ground, and the side wall of the sleeve 1 is provided with a plurality of flow holes 6.
A barrier layer 4 which can pass gas or liquid coolant 7 is left between the sleeve 1 and the partition plate 2, and the top of the sleeve 1 is in an open structure.
Between the barrier 4 and the sleeve 1 in each compartment, a flow of a gas or liquid coolant 7 can be achieved through flow openings 6 in the side wall of the sleeve 1.
The flow openings 6 are arranged uniformly from top to bottom on the side wall of the sleeve 1 and have the same height on 4 sides.
The circulation hole 6 is provided with an inclined hole in a mode of low outside and high inside, which is beneficial to controlling the circulation flow direction and can reduce the influence on the shielding of the opening hole.
The sleeve 1 has a heat insulation effect to ensure that the air inside and outside the sleeve 1 can form natural circulation under the temperature difference between the inside and the outside of the sleeve 1.
The separator 2 contains a neutron absorbing material to prevent the spent fuel assembly 5 from being critical.
When the spent fuel assembly 5 is exposed, the water level in the space between the storage unit 3 and the interlayer 4 is gradually reduced, a new circulation hole 6 is exposed out of the water surface after the space is reduced by a certain height, the gas in the storage unit 3 is heated by the spent fuel assembly 5 and is higher than the temperature of the gas in the interlayer 4, the density of the gas in the interlayer 4 is higher than that of the gas in the storage unit 3, the gas in the space between the storage unit 3 and the interlayer 4 forms natural circulation through the circulation hole 6 on the sleeve 1 under the action of pressure difference, and the natural circulation flow of the gas can take away the residual heat of the exposed part of the spent fuel assembly 5.
The solution in fig. 3 is a possible variant of the solution in fig. 1, 2, mainly considering different flow-through hole structures. Compared with the solutions in fig. 1 and 2, the solution in fig. 3 has the flow guide pipe arranged at the flow through hole 6, so that the reverse resistance passing through the flow guide pipe is larger than the forward resistance, and the control of the natural circulation direction of air is more facilitated.
The solution in fig. 4 is another possible variant of the solution in fig. 1, mainly taking into account the different flow hole heights. Compared to the solution in fig. 1, the solution of fig. 3 has a cross-section a-a with flow openings offset in height from the cross-section B-B with respect to the flow openings to reduce the height difference between the flow openings for the same number of openings, which is the maximum height of the area with poor flow between the flow openings and the water surface.
The device according to the present invention is not limited to the embodiments described in the specific embodiments, and those skilled in the art can derive other embodiments according to the technical solutions of the present invention, and also belong to the technical innovation scope of the present invention.
Claims (9)
1. A spent fuel storage grillwork with high safety is characterized in that: the spent fuel storage device comprises a plurality of storage grids which are separated by partition plates (2) and distributed in an array mode, wherein a sleeve (1) used for storing a spent fuel assembly (5) is arranged in each storage grid, the sleeve (1) is perpendicular to the ground, and a plurality of circulation holes (6) are formed in the side wall of the sleeve (1).
2. The high-safety spent fuel storage grid as claimed in claim 1, wherein: a barrier layer (4) through which a gas or liquid coolant (7) can pass is left between the sleeve (1) and the partition (2).
3. The high-safety spent fuel storage grid as claimed in claim 2, wherein: between the partition (4) and the sleeve (1) in each of the compartments, the circulation of the coolant (7) in a gas or liquid state can be achieved through the circulation holes (6) in the side wall of the sleeve (1).
4. The high-safety spent fuel storage grid as claimed in claim 3, wherein: the circulation holes (6) are uniformly arranged on the side wall of the sleeve (1) from top to bottom.
5. The high-safety spent fuel storage grid as claimed in claim 4, wherein: the circulation hole (6) adopts a mode of low outside and high inside to open an inclined hole, which is beneficial to controlling the circulation flow direction and can reduce the influence of the opened hole on the shielding.
6. The high-safety spent fuel storage grid as claimed in claim 5, wherein: the upper and lower positions of the circulation holes (6) on two adjacent side walls of the sleeve (1) are staggered, and the positions of the circulation holes (6) on two opposite side walls are consistent.
7. The high-safety spent fuel storage grid as claimed in claim 4, wherein: the flow holes (6) are provided with flow guide pipes, so that the reverse resistance passing through the flow guide pipes is larger than the forward resistance, and the natural circulation direction of air is favorably controlled.
8. The high-safety spent fuel storage grid as claimed in claim 1, wherein: the sleeve (1) has a heat insulation effect so as to ensure that air inside and outside the sleeve (1) can form natural circulation under the temperature difference.
9. The high-safety spent fuel storage grid as claimed in claim 1, wherein: the separator (2) contains neutron absorbing material, and can prevent the spent fuel assembly (5) from being critical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311410.3A CN111599500B (en) | 2020-04-20 | 2020-04-20 | Spent fuel storage grillwork of high security |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010311410.3A CN111599500B (en) | 2020-04-20 | 2020-04-20 | Spent fuel storage grillwork of high security |
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| Publication Number | Publication Date |
|---|---|
| CN111599500A true CN111599500A (en) | 2020-08-28 |
| CN111599500B CN111599500B (en) | 2023-01-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3663367A (en) * | 1969-12-31 | 1972-05-16 | Combustion Eng | Flow deflector for nuclear fuel element assemblies |
| CN102737741A (en) * | 2012-07-12 | 2012-10-17 | 中广核工程有限公司 | Spent fuel storage framework of nuclear power plant |
| CN103065696A (en) * | 2012-12-21 | 2013-04-24 | 清华大学 | Spent fuel dry-type storage device |
| CN206134269U (en) * | 2016-10-09 | 2017-04-26 | 江苏中海华核电材料科技有限公司 | Spentnuclear fuel dry -type container with screen work subassembly |
| CN110428914A (en) * | 2019-07-05 | 2019-11-08 | 中国核电工程有限公司 | A kind of Spent Fuel Pool system with air natural-circulation capacity |
-
2020
- 2020-04-20 CN CN202010311410.3A patent/CN111599500B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3663367A (en) * | 1969-12-31 | 1972-05-16 | Combustion Eng | Flow deflector for nuclear fuel element assemblies |
| CN102737741A (en) * | 2012-07-12 | 2012-10-17 | 中广核工程有限公司 | Spent fuel storage framework of nuclear power plant |
| CN103065696A (en) * | 2012-12-21 | 2013-04-24 | 清华大学 | Spent fuel dry-type storage device |
| CN206134269U (en) * | 2016-10-09 | 2017-04-26 | 江苏中海华核电材料科技有限公司 | Spentnuclear fuel dry -type container with screen work subassembly |
| CN110428914A (en) * | 2019-07-05 | 2019-11-08 | 中国核电工程有限公司 | A kind of Spent Fuel Pool system with air natural-circulation capacity |
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| Publication number | Publication date |
|---|---|
| CN111599500B (en) | 2023-01-17 |
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