CN112349437A - MOX fuel assembly rod bundle assembling method - Google Patents
MOX fuel assembly rod bundle assembling method Download PDFInfo
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- CN112349437A CN112349437A CN202011145802.3A CN202011145802A CN112349437A CN 112349437 A CN112349437 A CN 112349437A CN 202011145802 A CN202011145802 A CN 202011145802A CN 112349437 A CN112349437 A CN 112349437A
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- fuel
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- flat layer
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- 239000000446 fuel Substances 0.000 title claims abstract description 142
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000011068 loading method Methods 0.000 claims abstract description 13
- 238000009434 installation Methods 0.000 claims description 22
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 6
- 238000011179 visual inspection Methods 0.000 claims description 6
- 230000000007 visual effect Effects 0.000 claims description 4
- 229910052742 iron Inorganic materials 0.000 claims description 3
- 239000007779 soft material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000000463 material Substances 0.000 abstract description 3
- 238000012545 processing Methods 0.000 abstract description 2
- 238000000429 assembly Methods 0.000 description 2
- 230000000712 assembly Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000001338 self-assembly Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/30—Assemblies of a number of fuel elements in the form of a rigid unit
- G21C3/32—Bundles of parallel pin-, rod-, or tube-shaped fuel elements
- G21C3/334—Assembling, maintenance or repair of the bundles
-
- 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)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The invention relates to the technical field of nuclear special material processing, and particularly discloses a MOX fuel assembly rod bundle assembling method which comprises the following steps: step 1: arranging the grid plate frame of the MOX fuel assembly on the rod bundle assembling device, and starting a locking cylinder to lock the rod bundle assembling device; layering the grid plate frame, and arranging a fuel rod mounting position on each flat layer from bottom to top respectively; step 2: and sequentially loading the lower end plugs of the fuel rods into the corresponding fuel rod mounting positions on each flat layer from bottom to top and from left to right. According to the rod bundle assembling method, the risk of re-assembling the rod bundle after reworking, disassembling and reloading is reduced to the minimum, the irradiation time of operators is reduced, the personnel dosage protection level is improved, the production efficiency is improved, and the production capacity of a production line is ensured.
Description
Technical Field
The invention belongs to the technical field of nuclear special material processing, and particularly relates to a MOX fuel assembly rod bundle assembling method.
Background
The rod bundle assembly is a key assembly process technology for producing an experimental fast reactor MOX fuel assembly. The number of fuel rods in an experimental fast reactor MOX fuel assembly is regulated to be 61 according to the technical conditions of assembly development; meanwhile, the laser marking surface of the assembly is used as a reference standard, and the positions of 61 fuel rods in the assembly after the assembly of the rod bundle are required to be clear, so that the assembly has traceability and can correspond to the analysis and inspection results of the fuel rods one by one. Therefore, the installation position of the fuel rod is ensured to be determined in the assembly process of the rod bundle, and the problems of missing installation, less installation and wrong position installation of the fuel rod are avoided.
Although the rod cluster assembling process has reversibility, the rod cluster can be disassembled and reassembled after being wrongly assembled. However, due to the production of the strip hot material, the operator assembly is dose irradiated and the time mask also acts as part of the dose protection. Therefore, in order to reduce the exposure time of personnel and improve the production efficiency, the rod cluster assembling technology should have the advancement of successful one-time assembly.
At present, a V-shaped assembly method is commonly adopted for assembling the rod bundles, as shown in figure 1, the V-shaped assembly method is divided into 9V-shaped assemblies, 9, 7, 5, 3 and 1 fuel rods are sequentially arranged in each layer, and after the rods are arranged in each layer, the rods are arranged in a V shape and stacked layer by layer, and finally the rod bundle assembly of the whole assembly is completed. However, as the length of the rod bundle reaches 1345mm, the fuel rod has a serious 'tail flick' phenomenon after being installed in the grid plate, the plug part at the lower end of the rod bundle is normally installed, but the plug part at the upper end has a certain deviation, and the former fuel rod occupies the position of the latter fuel rod, so that the personnel cannot accurately judge, and the phenomena of missing installation, less installation and wrong installation frequently occur. Further analyzing the reason, the V-shaped loading method has no reference standard, and after the operator loads the bar, the loading state cannot be judged in time, so that the phenomena of missing loading, less loading and wrong loading are easily caused.
Therefore, it is desirable to design a new method for assembling a rod bundle to solve the above problems.
Disclosure of Invention
The invention aims to provide an MOX fuel assembly rod bundle assembling method which can avoid the phenomena of less rod bundle installation, neglected rod bundle installation and wrong rod bundle installation.
The technical scheme of the invention is as follows:
a MOX fuel assembly bundle assembly method comprising the steps of:
step 1: arranging the grid plate frame of the MOX fuel assembly on the rod bundle assembling device, and starting a locking cylinder to lock the rod bundle assembling device;
layering the grid plate frame, and arranging a fuel rod mounting position on each flat layer from bottom to top respectively;
step 2: and sequentially loading the lower end plugs of the fuel rods into the corresponding fuel rod mounting positions on each flat layer from bottom to top and from left to right.
In the step 1, the interval of each adjacent flat layer is the same, and the fuel rod mounting positions of the same flat layer are arranged at equal intervals.
And (3) judging whether the fuel rods are correctly installed or not by visual observation after the installation of one layer of fuel rods is finished in the step 2.
In step 2, if the height of a certain fuel rod in the flat layer is obviously higher than that of other fuel rods, and the distance between the fuel rod and other fuel rods in the flat layer is obviously different from that of other fuel rods in the same flat layer, the fuel rod is judged to be installed wrongly.
In the step 2, if the fuel rod is installed wrongly, the fuel rod which is installed wrongly is taken out from the installation position of the fuel rod by utilizing the sheet made of the soft material and is installed in the position where the fuel rod is installed originally; then, the assembly of the next fuel rod layer was started after the visual inspection was performed again and it was confirmed that there was no error.
And if the fuel rod is installed wrongly, taking out the wrongly installed fuel rod from the fuel rod installation position by using the iron sheet.
In the step 2, if the distance between two adjacent fuel rods is obviously larger than the distance between the other fuel rods, judging that one less fuel rod is loaded at the large distance, and performing supplementary loading.
In step 2, if the fuel rods of the flat layer have obviously same spacing and are all at the same horizontal height, the flat layer is judged to be installed correctly.
The invention has the following remarkable effects:
(1) compared with a V-shaped assembling method, the rod cluster assembling method has the capability of calibrating and determining after self-assembly, operators can visually confirm after the assembling, equipment does not need to be added for judgment, and the qualification rate of the rod cluster assembly can be ensured to reach 100%.
(2) According to the rod bundle assembling method, the risk of re-assembling the rod bundle after reworking, disassembling and reloading is reduced to the minimum, the irradiation time of operators is reduced, the personnel dosage protection level is improved, the production efficiency is improved, and the production capacity of a production line is ensured.
Drawings
FIG. 1 is a schematic view of a bundle V-pack and a bar diagram;
FIG. 2 is a schematic of a bundle flush mount and bar diagram;
FIG. 3 is a schematic view of a grid framework.
In the figure, 1, the middle grid plate; 2. grid plate number 2 on the right; 3. right grid No. 3.
Detailed Description
The invention is described in further detail below with reference to the figures and the embodiments.
A MOX fuel assembly bundle assembly method as shown in fig. 2, comprising the steps of:
step 1: arranging the grid plate frame of the MOX fuel assembly on the rod bundle assembling device, and starting a locking cylinder to lock the rod bundle assembling device;
as shown in fig. 3, the grid plate frame is layered and divided into 17 flat layers, and the interval between every two adjacent flat layers is the same; 1, 2, 3, 4, 5, 4, 3, 2 and 1 fuel rod mounting positions are respectively arranged on 17 flat layers from bottom to top, and the fuel rod mounting positions of the same flat layer are arranged at equal intervals;
step 2: sequentially loading the lower end plugs of 61 fuel rods into corresponding fuel rod mounting positions on 17 flat layers from bottom to top and from left to right;
judging whether the fuel rods are correctly installed or not by visual observation after the installation of one layer of fuel rods is finished;
the specific method for visual judgment comprises the following steps:
if the fuel rods of the flat layer have obviously the same spacing and are all at the same horizontal height, judging that the flat layer is correctly installed;
if the height of a certain fuel rod of the flat layer is obviously higher than that of other fuel rods, and the space between the fuel rod and other fuel rods of the flat layer is obviously different from that of other fuel rods of the same flat layer, judging that the fuel rod is installed wrongly; taking out the wrongly-installed fuel rods from the fuel rod installation positions by using sheets made of iron sheets or soft materials, and installing the wrongly-installed fuel rods into the positions where the fuel rods are to be installed; then, carrying out visual inspection again, and starting the assembly of the next layer of fuel rods after confirming that no errors exist;
and if the distance between two adjacent fuel rods is obviously larger than the distances between the other fuel rods, judging that one less fuel rod is loaded at the large distance, and performing supplementary loading.
Example 1
The method is characterized in that 122 experimental fast reactor MOX fuel rods are used for completing assembly of fuel rod bundles produced by two experimental fast reactor MOX fuel assemblies, and the method mainly comprises the following steps:
step 1: correctly arranging the experimental fast reactor MOX fuel assembly grid plate frame on a rod bundle assembling device, and starting a locking cylinder to lock the experimental fast reactor MOX fuel assembly grid plate frame;
step 2: the first layer is loaded, the lower end plug part of a first fuel rod m0 is firstly loaded into the middle grid plate 1, the assembly of the first layer fuel rod is completed, only one fuel rod is needed, and therefore, the first layer fuel rod only needs to be judged to be loaded into the middle grid plate 1;
and step 3: the second layer is loaded, the fuel rods m1 and m2 are loaded on the left small grid plate No. 2 and the right small grid plate No. 2 of the second layer, the assembly of the fuel rods of the second layer is completed, the number is small, and the grid plates in which the fuel rods are loaded are ensured to be correct by visual inspection;
and 4, step 4: the third layer is arranged, fuel rods m3, m4 and m5 are arranged on the small grid plate No. 3 at the left, the middle and the small grid plates No. 3 at the right, and visual inspection is carried out again after the layer is arranged, so that the fuel rods are ensured to be arranged at the correct positions;
....
step 18: seventeenth layer, fuel rods m61 are arranged in the uppermost mounting position of the middle grid plate 1, and the assembly work of the experimental fast reactor MOX fuel assembly rod bundle is completed;
step 19: and (4) repeating the steps 1-18 to complete the assembly work of the rod bundle of the MOX fuel assembly of the second experimental fast reactor.
Wherein each experimental fast reactor MOX fuel assembly rod bundle is assembled and decomposed into 17 flat layers which are sequentially filled, and 1, 2, 3, 4, 5, 4, 5, 4, 3, 2 and 1 fuel rod is filled in each layer. And (4) after one layer is installed, namely, the other layer is inspected, the missing installation and the wrong installation are corrected in time when the problems of missing installation and wrong installation are found, the assembly of 17 flat layers is completed in sequence, and finally the rod bundle assembly work of the experimental fast reactor MOX fuel assembly is completed.
The rod bundle assembling process is stable and efficient, the rod bundle is reasonably assembled, the assembling power of the rod bundle is 100%, and the disassembling and reworking phenomena are not generated.
Example 2
Using 74 exemplary fast reactor MOX fuel rods to complete the assembly of two exemplary fast reactor MOX fuel assembly fuel rod bundles, each exemplary fast reactor MOX fuel assembly rod bundle assembly 37 fuel rods, which is different from the assembly of an experimental fast reactor rod bundle only in quantity difference, the flush mounting method is still applicable, and is still explained by using fig. 2, and the main steps are as follows:
step 1: correctly arranging the grid plate frame of the demonstration fast reactor MOX fuel assembly on a rod bundle assembling device, and starting a locking cylinder to lock the rod bundle assembling device;
step 2: the first layer is loaded, the lower end plug part of a first fuel rod w0 is firstly loaded into the middle grid plate, the specific loading position is the number five position in figure 2, the assembly of the first layer fuel rod is completed, only one fuel rod is needed, and therefore, the first layer fuel rod is only needed to be judged to be loaded into the middle grid plate;
and step 3: the second layer is arranged, fuel rods w1 and w2 are arranged in the positions of the numbers of eight and nine in the drawing 2, the assembly of the fuel rods of the second layer is completed, the number is small, and the grid plates for arranging the fuel rods are ensured to be correct by visual inspection;
and 4, step 4: the third layer is filled, and fuel rods w3, w4 and w5 are filled in the fuel rod box in the figure 2
The number position is checked visually again after the layer is installed, and the fuel rod is ensured to be installed at the correct position;
...
step 14: thirteenth layer of fuel rods w37 in FIG. 2
Number position, completing the assembly work of the rod bundle of the demonstration fast reactor MOX fuel assembly;
step 15: and repeating the steps 1-14 to finish the assembly work of the rod bundle of the second demonstration fast reactor MOX fuel assembly.
Wherein each box is divided into 13 flat layers which are filled in sequence, and 1, 2, 3, 4, 3, 2 and 1 fuel rod is respectively filled in each layer. The rod bundle assembling process is stable and efficient, the rod bundle is reasonably assembled, the assembling power of the rod bundle is 100%, and the disassembling and reworking phenomena are not generated.
Claims (8)
1. A MOX fuel assembly bundle assembly method, characterized in that: the method comprises the following steps:
step 1: arranging the grid plate frame of the MOX fuel assembly on the rod bundle assembling device, and starting a locking cylinder to lock the rod bundle assembling device;
layering the grid plate frame, and arranging a fuel rod mounting position on each flat layer from bottom to top respectively;
step 2: and sequentially loading the lower end plugs of the fuel rods into the corresponding fuel rod mounting positions on each flat layer from bottom to top and from left to right.
2. The MOX fuel assembly bundle assembly method of claim 1, wherein: in the step 1, the interval of each adjacent flat layer is the same, and the fuel rod mounting positions of the same flat layer are arranged at equal intervals.
3. The MOX fuel assembly bundle assembly method of claim 2, wherein: and (3) judging whether the fuel rods are correctly installed or not by visual observation after the installation of one layer of fuel rods is finished in the step 2.
4. The MOX fuel assembly bundle assembly method of claim 3, wherein: in step 2, if the height of a certain fuel rod in the flat layer is obviously higher than that of other fuel rods, and the distance between the fuel rod and other fuel rods in the flat layer is obviously different from that of other fuel rods in the same flat layer, the fuel rod is judged to be installed wrongly.
5. The MOX fuel assembly bundle assembly method of claim 4, wherein: in the step 2, if the fuel rod is installed wrongly, the fuel rod which is installed wrongly is taken out from the installation position of the fuel rod by utilizing the sheet made of the soft material and is installed in the position where the fuel rod is installed originally; then, the assembly of the next fuel rod layer was started after the visual inspection was performed again and it was confirmed that there was no error.
6. The MOX fuel assembly bundle assembly method of claim 5, wherein: and if the fuel rod is installed wrongly, taking out the wrongly installed fuel rod from the fuel rod installation position by using the iron sheet.
7. The MOX fuel assembly bundle assembly method of claim 3, wherein: in the step 2, if the distance between two adjacent fuel rods is obviously larger than the distance between the other fuel rods, judging that one less fuel rod is loaded at the large distance, and performing supplementary loading.
8. The MOX fuel assembly bundle assembly method of claim 3, wherein: in step 2, if the fuel rods of the flat layer have obviously same spacing and are all at the same horizontal height, the flat layer is judged to be installed correctly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011145802.3A CN112349437A (en) | 2020-10-23 | 2020-10-23 | MOX fuel assembly rod bundle assembling method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011145802.3A CN112349437A (en) | 2020-10-23 | 2020-10-23 | MOX fuel assembly rod bundle assembling method |
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| CN112349437A true CN112349437A (en) | 2021-02-09 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08313665A (en) * | 1995-05-16 | 1996-11-29 | Hitachi Ltd | Reactor fuel assembly and method for assembling it |
| US6320922B1 (en) * | 1999-05-07 | 2001-11-20 | General Electric Company | Tool for retracting fuel rods from and inserting fuel rods into a nuclear fuel assembly and methods therefor |
| CN104508750A (en) * | 2012-04-26 | 2015-04-08 | 通用电气-日立核能美国有限责任公司 | Fuel bundle for liquid metal cooled nuclear reactor |
| CN109559835A (en) * | 2018-11-29 | 2019-04-02 | 中国人民解放军国防科技大学 | Hexagonal accelerator-driven subcritical reactor fuel assembly and design method thereof |
-
2020
- 2020-10-23 CN CN202011145802.3A patent/CN112349437A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08313665A (en) * | 1995-05-16 | 1996-11-29 | Hitachi Ltd | Reactor fuel assembly and method for assembling it |
| US6320922B1 (en) * | 1999-05-07 | 2001-11-20 | General Electric Company | Tool for retracting fuel rods from and inserting fuel rods into a nuclear fuel assembly and methods therefor |
| CN104508750A (en) * | 2012-04-26 | 2015-04-08 | 通用电气-日立核能美国有限责任公司 | Fuel bundle for liquid metal cooled nuclear reactor |
| CN109559835A (en) * | 2018-11-29 | 2019-04-02 | 中国人民解放军国防科技大学 | Hexagonal accelerator-driven subcritical reactor fuel assembly and design method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 俞强强: "基于视觉伺服的核燃料棒组装机器人位姿精确识别研究", 《中国优秀硕士论文全文数据库（工程科技Ⅱ辑）》, vol. 1, 15 February 2016 (2016-02-15), pages 312 - 313 * |
| 肖岷: "《压水堆核电站燃料管理、燃料制造与燃料运行》", vol. 1, 原子能出版社, pages: 312 - 313 * |
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