CN112820436A - Storage sealing device and transportation maintenance method - Google Patents
Storage sealing device and transportation maintenance method Download PDFInfo
- Publication number
- CN112820436A CN112820436A CN202110018925.9A CN202110018925A CN112820436A CN 112820436 A CN112820436 A CN 112820436A CN 202110018925 A CN202110018925 A CN 202110018925A CN 112820436 A CN112820436 A CN 112820436A
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- China
- Prior art keywords
- sealed container
- top cover
- storage
- cover
- hole
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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
- G21F5/00—Transportable or portable shielded containers
- G21F5/06—Details of, or accessories to, the containers
- G21F5/12—Closures for containers; Sealing arrangements
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
- G21F3/00—Shielding characterised by its physical form, e.g. granules, or shape of the material
-
- 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
- G21F5/00—Transportable or portable shielded containers
- G21F5/06—Details of, or accessories to, the containers
Abstract
The invention relates to the field of nuclear power device maintenance, in particular to a storage sealing device and a transfer maintenance method.
Description
Technical Field
The invention relates to the field of maintenance of nuclear power devices, in particular to a storage sealing device and a transfer maintenance method.
Background
The design life of the water-pressing reactor nuclear power unit is generally 40-60 years, and the design capacity of a spent fuel storage pool matched with the unit can only meet the storage requirement of spent fuel discharged in more than 10 years. When the spent fuel storage pool is close to full capacity, spent fuel stored in the spent fuel storage pool for a certain period of time needs to be removed and transferred to a spent fuel post-treatment facility or a spent fuel dry-type storage system in a nuclear power plant.
The spent fuel dry-type storage system mainly comprises a sealed container, a transfer container, a storage container and the like. The sealed container mainly plays a role in containing radioactive substances, and a fuel basket is arranged in the sealed container and can be used for loading fuel assemblies; the transfer container mainly plays a role in structural protection and radiation protection, and is mainly used for providing shielding protection in the in-plant transfer process of the sealed container; the storage container also has the main functions of structural protection and radiation protection, and finally the sealed container needs to be guided into the storage container from the transfer container, and the storage container can provide structural protection and radiation protection for the sealed container in the long-term storage process of the sealed container. Meanwhile, the bottom and the top of the storage container are also provided with air vents, so that decay heat generated by spent fuel in the sealed container can be discharged in a passive mode.
In a fuel loading and unloading area of a nuclear power unit, after a spent fuel loading operation is completed on a sealed container, the sealed container and a transfer container (the sealed container is placed in the transfer container) are transferred to a cleaning pool station from a charging pool station, and a large number of operations such as automatic welding of a top cover of the sealed container, nondestructive detection of a welding line, drainage, vacuumizing, drying, helium filling, leakage detection and the like on the sealed container are completed on the cleaning pool station. The above operation requires manual intervention of an operator, and belongs to high radiation risk operation. The conventional solution is to thicken the top cover of the sealed container to improve the radiation protection effect. However, the radiation from the spent fuel includes both gamma radiation and neutron radiation, and the sealed container needs to be stored in the storage container for a long time, so that the use of materials with aging risks is avoided, and generally, the main material of the sealed container is stainless steel, and the stainless steel has a good shielding effect on the gamma radiation but has a poor shielding effect on the neutrons.
Accordingly, there remains a need in the art for improvements.
Disclosure of Invention
Compared with the prior art, the invention can reduce the personnel irradiation risk of the cleaning pool station related operation in the operation process of the dry-type storage system.
In order to achieve the purpose, the invention adopts the following technical scheme:
the present invention provides a storage sealing device, comprising:
the fuel tank comprises a vertically arranged sealed container, a fuel basket and a fuel tank, wherein the sealed container is cylindrical, the top of the sealed container is connected with a top cover in a welding mode, the bottom of the sealed container is provided with a bottom plate, and the interior of a cavity of the sealed container is provided with the fuel basket;
a connecting threaded hole, a vent hole and a drain hole are formed above the top cover respectively;
the auxiliary sealing cover is fixedly arranged above the top cover through a quick-release bolt, a through hole is formed in the auxiliary sealing cover, and the quick-release bolt is screwed and fixed with the connecting threaded hole through the through hole;
the auxiliary sealing cover comprises a neutron shielding layer and a gamma ray shielding layer;
the auxiliary sealing cover is provided with a vent hole opening and a drain hole opening corresponding to the vent hole and the drain hole of the top cover respectively.
Furthermore, the top cover is fixedly connected with the sealed container in a sealing mode through an upper ring section, and the bottom plate is fixedly connected with the sealed container in a sealing mode through a lower ring section.
Further, the neutron shielding layer comprises one or more of hydrogen-rich organic materials, water and concrete.
Further, the gamma ray shielding layer comprises one or more of lead, steel and concrete.
Further, the outer diameter of the auxiliary sealing cover is slightly smaller than that of the top cover.
Furthermore, the top of the auxiliary sealing cover is provided with a lifting lug.
The invention also provides a transferring and maintaining method of the storage sealing device, which comprises the storage sealing device with the auxiliary shielding cover, and also comprises the following steps:
1) aligning the vent hole opening and the drain hole opening of the auxiliary sealing cover with the vent hole and the drain hole of the top cover;
2) fixedly connecting the auxiliary sealing cover with the top cover through a quick-release bolt;
3) welding the top cover and the sealed container by using an automatic welding device, and carrying out nondestructive testing;
4) vacuumizing, filling helium and draining the interior of the sealed container through the vent hole and the drain hole, and performing leakage detection operation on the sealed container;
5) removing the quick-release bolt, and removing the auxiliary sealing cover by external hoisting equipment through a hoisting lug;
6) and sealing the container for subsequent transfer operation.
The invention has the beneficial effects that: the irradiation risk of personnel who wash pond station correlation operation in the dry-type storage system operation procedure can be reduced, supplementary sealed lid can be retrieved and recycled, has effectively practiced thrift the resource, has improved the device utilization ratio.
Drawings
FIG. 1 is a front sectional view of a sealed container according to the present invention;
FIG. 2 is a schematic top view of the top lid of the sealed container provided by the present invention;
fig. 3 is a front structural sectional view of the hermetic container provided with the auxiliary shield cover according to the present invention;
FIG. 4 is a schematic top view of the sealed container provided with the auxiliary shield cover according to the present invention;
FIG. 5 is a schematic cross-sectional view of an auxiliary shield cover provided by the present invention;
fig. 6 is a schematic top view of an auxiliary shield cover provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
As shown in fig. 1 to 6, the present invention provides a storage sealing device, comprising:
the fuel tank comprises a vertically arranged sealed container 3, wherein the sealed container 3 is cylindrical, the top of the sealed container 3 is connected with a top cover 1 in a welding mode, the bottom of the sealed container is provided with a bottom plate 6, and a fuel basket 4 is arranged inside a cavity of the sealed container 3;
a connecting threaded hole 1-1, a vent hole 1-2 and a drain hole 1-3 are respectively formed above the top cover 1;
the auxiliary sealing cover 7 is fixedly arranged above the top cover 1 through a quick-release bolt 7-1, a through hole 7-2 is formed in the auxiliary sealing cover 7, and the quick-release bolt 7-1 is screwed and fixed with the connecting threaded hole 1-1 through the through hole 7-2;
the auxiliary sealing cover 7 internally comprises a neutron shielding layer 7-3 and a gamma ray shielding layer 7-4;
the auxiliary sealing cover 7 is provided with a vent hole opening 7-5 and a drain hole opening 7-6 respectively corresponding to the vent hole 1-2 and the drain hole 1-3 of the top cover.
Further, the top cover 1 and the sealed container 3 are fixedly connected in a sealing mode through an upper ring section 2, and the bottom plate 6 and the sealed container 3 are fixedly connected in a sealing mode through a lower ring section 5.
Further, the neutron shielding layer 7-3 comprises one or more of hydrogen-rich organic materials, water and concrete.
Further, the gamma ray shielding layer 7-4 comprises one or more of lead, steel and concrete.
Further, the outer diameter of the auxiliary sealing cover 7 is slightly smaller than that of the top cover 1.
Furthermore, the top of the auxiliary sealing cover 7 is provided with a lifting lug 7-7.
The invention also provides a transferring and maintaining method of the storage sealing device, which comprises the storage sealing device with the auxiliary shielding cover, and also comprises the following steps:
1) aligning the vent hole opening and the drain hole opening of the auxiliary sealing cover with the vent hole and the drain hole of the top cover;
2) fixedly connecting the auxiliary sealing cover with the top cover through a quick-release bolt;
3) welding the top cover and the sealed container by using an automatic welding device, and carrying out nondestructive testing;
4) vacuumizing, filling helium and draining the interior of the sealed container through the vent hole and the drain hole, and performing leakage detection operation on the sealed container;
5) removing the quick-release bolt, and removing the auxiliary sealing cover by external hoisting equipment through a hoisting lug;
6) and sealing the container for subsequent transfer operation.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (7)
1. A storage sealing device, comprising:
the fuel tank comprises a vertically arranged sealed container, a fuel basket and a fuel tank, wherein the sealed container is cylindrical, the top of the sealed container is connected with a top cover in a welding mode, the bottom of the sealed container is provided with a bottom plate, and the interior of a cavity of the sealed container is provided with the fuel basket;
a connecting threaded hole, a vent hole and a drain hole are formed above the top cover respectively;
the auxiliary sealing cover is fixedly arranged above the top cover through a quick-release bolt, a through hole is formed in the auxiliary sealing cover, and the quick-release bolt is screwed and fixed with the connecting threaded hole through the through hole;
the auxiliary sealing cover comprises a neutron shielding layer and a gamma ray shielding layer;
the auxiliary sealing cover is provided with a vent hole opening and a drain hole opening corresponding to the vent hole and the drain hole of the top cover respectively.
2. The storage sealing device of claim 1, wherein the top cover is sealingly and fixedly connected to the sealed container by an upper ring segment, and the bottom plate is sealingly and fixedly connected to the sealed container by a lower ring segment.
3. The storage seal of claim 1, wherein the neutron shielding layer comprises one or more of a hydrogen-rich organic material, water, concrete.
4. The storage sealing device of claim 1, wherein the gamma ray shielding layer comprises one or more of lead, steel, concrete.
5. The storage sealing device of claim 1, wherein the secondary sealing cap has an outer diameter that is slightly smaller than an outer diameter of the top cover.
6. The storage sealing device of claim 1, wherein the secondary sealing cap is provided with lifting lugs at the top.
7. A method of transporting and maintaining a storage seal comprising the storage seal of any one of claims 1 to 6, further comprising the steps of:
1) aligning the vent hole opening and the drain hole opening of the auxiliary sealing cover with the vent hole and the drain hole of the top cover;
2) fixedly connecting the auxiliary sealing cover with the top cover through a quick-release bolt;
3) welding the top cover and the sealed container by using an automatic welding device, and carrying out nondestructive testing;
4) vacuumizing, filling helium and draining the interior of the sealed container through the vent hole and the drain hole, and performing leakage detection operation on the sealed container;
5) removing the quick-release bolt, and removing the auxiliary sealing cover by external hoisting equipment through a hoisting lug;
6) and sealing the container for subsequent transfer operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110018925.9A CN112820436A (en) | 2021-01-07 | 2021-01-07 | Storage sealing device and transportation maintenance method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110018925.9A CN112820436A (en) | 2021-01-07 | 2021-01-07 | Storage sealing device and transportation maintenance method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112820436A true CN112820436A (en) | 2021-05-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202110018925.9A Pending CN112820436A (en) | 2021-01-07 | 2021-01-07 | Storage sealing device and transportation maintenance method |
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| CN (1) | CN112820436A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113808770A (en) * | 2021-08-10 | 2021-12-17 | 中国核电工程有限公司 | Sealed container for storage and transportation of spent fuel assembly |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5438597A (en) * | 1993-10-08 | 1995-08-01 | Vectra Technologies, Inc. | Containers for transportation and storage of spent nuclear fuel |
| JP2000193790A (en) * | 1998-12-25 | 2000-07-14 | Kobe Steel Ltd | Vessel for transportation and storage of radioactive material |
| JP2012198105A (en) * | 2011-03-22 | 2012-10-18 | Kobe Steel Ltd | Preparation operation method for radioactive material transport storage container, and lid part auxiliary shield body for preparation operation thereof |
| CN106024085A (en) * | 2016-06-14 | 2016-10-12 | 中广核工程有限公司 | Transfer container for dry storage of nuclear power plant spent fuel |
| CN106448783A (en) * | 2016-12-12 | 2017-02-22 | 深圳中广核工程设计有限公司 | Dual-functional spent-fuel storage and transportation metal tank of nuclear power plant |
| CN110444307A (en) * | 2018-05-04 | 2019-11-12 | 中国核电工程有限公司 | A kind of multipurpose irradiated fuel assembly container with multilayer cover structure |
-
2021
- 2021-01-07 CN CN202110018925.9A patent/CN112820436A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5438597A (en) * | 1993-10-08 | 1995-08-01 | Vectra Technologies, Inc. | Containers for transportation and storage of spent nuclear fuel |
| JP2000193790A (en) * | 1998-12-25 | 2000-07-14 | Kobe Steel Ltd | Vessel for transportation and storage of radioactive material |
| JP2012198105A (en) * | 2011-03-22 | 2012-10-18 | Kobe Steel Ltd | Preparation operation method for radioactive material transport storage container, and lid part auxiliary shield body for preparation operation thereof |
| CN106024085A (en) * | 2016-06-14 | 2016-10-12 | 中广核工程有限公司 | Transfer container for dry storage of nuclear power plant spent fuel |
| CN106448783A (en) * | 2016-12-12 | 2017-02-22 | 深圳中广核工程设计有限公司 | Dual-functional spent-fuel storage and transportation metal tank of nuclear power plant |
| CN110444307A (en) * | 2018-05-04 | 2019-11-12 | 中国核电工程有限公司 | A kind of multipurpose irradiated fuel assembly container with multilayer cover structure |
Non-Patent Citations (3)
| Title |
|---|
| 奚梅英 等: "秦山三期CANDU 6机组的燃料操作系统", 核科学与工程, vol. 21, no. 2, pages 176 - 181 * |
| 曹钧;朱桂明;阚一炜;: "压水堆乏燃料干式贮存的安全考量", 辐射防护通讯, vol. 38, no. 1, pages 1 - 7 * |
| 袁呈煜 等: "压水堆乏燃料干法贮存技术应用研究", 核科学与工程, vol. 37, no. 3, pages 470 - 476 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113808770A (en) * | 2021-08-10 | 2021-12-17 | 中国核电工程有限公司 | Sealed container for storage and transportation of spent fuel assembly |
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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. |