CN111681785A - C-shaped fixing device for lower end of annular fuel rod and lower pipe seat - Google Patents
C-shaped fixing device for lower end of annular fuel rod and lower pipe seat Download PDFInfo
- Publication number
- CN111681785A CN111681785A CN202010448585.9A CN202010448585A CN111681785A CN 111681785 A CN111681785 A CN 111681785A CN 202010448585 A CN202010448585 A CN 202010448585A CN 111681785 A CN111681785 A CN 111681785A
- Authority
- CN
- China
- Prior art keywords
- fixing device
- fuel rod
- shaped fixing
- annular fuel
- pipe seat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000446 fuel Substances 0.000 title claims abstract description 86
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000009434 installation Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-ZSJDYOACSA-N Heavy water Chemical compound [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 claims description 4
- 238000009835 boiling Methods 0.000 claims description 2
- 239000002826 coolant Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000005253 cladding Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003758 nuclear fuel Substances 0.000 description 1
- 239000000941 radioactive substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C5/00—Moderator or core structure; Selection of materials for use as moderator
- G21C5/02—Details
- G21C5/06—Means for locating or supporting fuel elements
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Liquid Carbonaceous Fuels (AREA)
Abstract
A C-shaped fixing device for the lower end of an annular fuel rod and a lower pipe seat comprises a cylindrical C-shaped fixing device, wherein the whole cylindrical C-shaped fixing device is C-shaped, and an opening of the cylindrical C-shaped fixing device is provided with a mounting cylinder; the lower end of the annular fuel rod is provided with a groove, and the lower end of the annular fuel rod is arranged on the lower tube seat through a cylindrical C-shaped fixing device. When the disassembly is needed, force towards two sides is applied from the lower end of the annular fuel rod and the opening of the lower pipe seat C-shaped fixing device, and therefore quick disassembly is achieved.
Description
Technical Field
The invention belongs to the technical field of nuclear fuel, and particularly relates to a C-shaped fixing device for the lower end of an annular fuel rod and a lower pipe seat.
Background
In the current fuel assembly design, a fuel rod is clamped by a positioning grid and fixed between an upper pipe seat and a lower pipe seat, and a certain gap exists between a lower end plug of the fuel rod and the lower pipe seat. When the spacer grids are loosened during the operation of the reactor, the clamping force is weakened and is not enough to fix the fuel rods, the fuel rods fall down, and the integrity of the fuel rods is possibly threatened and the failure probability of the fuel rods is increased in the process that the lower end plugs of the fuel rods fall down and collide with the lower pipe seats. In addition, under the condition that the spacer grids lose clamping force, the fuel rods falling on the lower tube seat can move up and down under the action of water flow lifting force, so that the friction between the fuel rods and the spacer grids and the collision probability between the fuel rods and the lower tube seat are increased, and the safety of the fuel rods is not facilitated.
The fuel rod with the free lower end plug is easy to generate flow-induced vibration in the process of scouring the coolant, and the contact position of the vibrating fuel rod and the positioning grid generates fretting abrasion, so that the cladding thickness of the fuel rod is reduced, even the cladding is broken, and radioactive substances possibly leak.
The annular fuel rod cools the fuel rod through the enclosed inner and outer coolant flow channels. With the operation of the reactor, tiny impurities, such as waste remained in the manufacturing process of components in the pressure vessel stack or in a main loop pipeline, or corrosion products formed in the operation process of the reactor, are easy to occur in a main system, so that the flow channel of the fuel rod is easily blocked, the central hole of the lower end plug is the only water inlet hole of the internal flow channel, and if the water inlet hole of the lower end plug is blocked, the flow of the internal flow channel of the annular fuel rod is reduced, the sufficient cooling capacity of the fuel rod cannot be maintained, and the safety of the fuel rod is threatened.
Disclosure of Invention
The invention aims to solve the defects in the prior art and design a C-shaped fixing device for the lower end of an annular fuel rod and a lower pipe seat.
The technical scheme of the invention is as follows: a C-shaped fixing device for the lower end of an annular fuel rod and a lower pipe seat comprises a cylindrical C-shaped fixing device, wherein the whole cylindrical C-shaped fixing device is C-shaped, and an opening of the cylindrical C-shaped fixing device is provided with a mounting cylinder; the lower end of the annular fuel rod is provided with a groove, and the lower end of the annular fuel rod is arranged on the lower tube seat through a cylindrical C-shaped fixing device.
When the disassembly is needed, force towards two sides is applied from the lower end of the annular fuel rod and the opening of the lower pipe seat C-shaped fixing device, and therefore quick disassembly is achieved.
The utility model provides an annular fuel rod lower extreme and lower tube seat C type fixing device, includes round hole type C type fixing device, and round hole type C type fixing device is whole to be the C type, and its opening part is the installation round hole, and at annular fuel rod lower extreme fluted, and annular fuel rod lower extreme passes through round hole type C type fixing device and installs on the lower tube seat.
Force is applied to two sides from the lower end of the annular fuel rod and the opening of the lower pipe seat C-shaped fixing device, so that quick disassembly is realized.
The lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the power stack.
The lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to a pressurized water reactor.
The lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the marine power stack.
The lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the fast reactor.
The lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the boiling water reactor.
The lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the heavy water reactor.
The invention has the beneficial effects that:
the lower end fixing piece is used for connecting and fixing the lower end plug and the lower tube seat, so that the fuel rod is prevented from falling on the lower tube seat in the reactor operation process, the falling impact force is avoided, and the failure probability of the fuel rod is reduced. Meanwhile, the lower end fixing piece fixes the fuel rod on the lower tube seat, so that the fuel rod is prevented from moving axially under the action of the flow lifting force of the coolant, and the friction between the fuel rod and the positioning lattice frame is reduced.
The lower end plug and the lower pipe seat are fixed through the lower end fixing piece, flow-induced vibration caused by scouring of the fuel rods by the coolant is reduced, fretting abrasion of the fuel rods is reduced, and the failure risk of the fuel rods is reduced.
Drawings
FIG. 1 is a schematic view of a C-shaped fixing device for the lower end of a cylindrical annular fuel rod and a lower pipe seat according to the present invention
FIG. 2 is a view showing the installation of the C-shaped fixing device for the lower end of the cylindrical annular fuel rod and the lower tube seat according to the present invention
FIG. 3 is a schematic view of a C-shaped fixing device for the lower end of a round hole type annular fuel rod and a lower tube seat of the present invention
FIG. 4 is a plan view of the C-shaped fixing device for the lower end of the circular hole type annular fuel rod and the lower tube seat of the present invention
FIG. 5 is a perspective view of the fixing device for fixing the lower end of the circular hole type annular fuel rod and the lower tube seat C-shaped.
FIG. 6 is a view of a circular hole type C-shaped fixing device for the lower end of the circular hole type annular fuel rod and the lower tube seat C-shaped fixing device of the present invention
In the figure: 1 mounting cylinder, lower end 2 of annular fuel rod, groove 3, lower pipe seat 4, cylindrical C-shaped fixing device 5, mounting round hole 6 and round hole type C-shaped fixing device 7
Detailed Description
A C-shaped fixing device for the lower end of an annular fuel rod and a lower pipe seat comprises a cylindrical and a round hole,
example 1
As shown in fig. 1, the cylindrical C-shaped fixing device 5 is integrally C-shaped, the opening of the cylindrical C-shaped fixing device is provided with an installation cylinder 1, as shown in fig. 2 and 3, a groove 3 is formed at the lower end of the lower end 2 of the annular fuel rod, and the lower end 2 of the annular fuel rod is installed on the lower tube seat 4 through the cylindrical C-shaped fixing device 5;
example 2
The round hole type C-shaped fixing device 7 is integrally C-shaped as shown in figure 4, the opening of the round hole type C-shaped fixing device is provided with a mounting round hole 6, as shown in figures 5 and 6, the lower end of the lower end 2 of the annular fuel rod is provided with a groove 3, and the lower end 2 of the annular fuel rod is mounted on the lower tube seat 4 through the round hole type C-shaped fixing device 7;
the device has the characteristic of vibration resistance, and can not fall off under the condition of vibration;
when the disassembly is needed, force towards two sides is applied from the lower end of the annular fuel rod and the opening of the lower pipe seat C-shaped fixing device, and therefore quick disassembly is achieved.
Claims (10)
1. The utility model provides an annular fuel rod lower extreme and lower tube seat C type fixing device which characterized in that: comprises a cylindrical C-shaped fixing device (5), wherein the whole cylindrical C-shaped fixing device (5) is C-shaped, and an opening of the cylindrical C-shaped fixing device is provided with an installation cylinder (1); the fuel rod structure is characterized by further comprising an annular fuel rod lower end (2), a groove (3) is formed in the lower end of the annular fuel rod lower end (2), and the annular fuel rod lower end (2) is installed on the lower tube seat (4).
2. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in claim 1, wherein: the lower end (2) of the annular fuel rod is arranged on the lower tube seat (4) through a cylindrical C-shaped fixing device (5).
3. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in claim 1, wherein: when the disassembly is needed, force towards two sides is applied from the opening of the whole device, so that the quick disassembly is realized.
4. The utility model provides an annular fuel rod lower extreme and lower tube seat C type fixing device which characterized in that: the device comprises a round hole type C-shaped fixing device (7), wherein the round hole type C-shaped fixing device (7) is integrally C-shaped, an installation round hole (6) is formed in an opening of the round hole type C-shaped fixing device, a groove (3) is formed in the lower end of the lower end (2) of the annular fuel rod, and the lower end (2) of the annular fuel rod is installed on a lower tube seat (4).
5. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in claim 3, wherein: the lower end (2) of the annular fuel rod is arranged on the lower tube seat (4) through a round hole type C-shaped fixing device (7).
6. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in claim 3, wherein: a force is applied to both sides from the opening of the entire device, thereby enabling quick detachment.
7. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in any one of claims 1 to 6, wherein: the lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to power reactors and boiling water reactors.
8. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in any one of claims 1 to 6, wherein: the C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat is applied to pressurized water reactors and heavy water reactors.
9. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in any one of claims 1 to 6, wherein: the lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the marine power stack.
10. The C-shaped fixing device for the lower end of the annular fuel rod and the lower pipe seat as claimed in any one of claims 1 to 6, wherein: the lower end of the annular fuel rod and the C-shaped fixing device of the lower pipe seat are applied to the fast reactor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010448585.9A CN111681785A (en) | 2020-05-25 | 2020-05-25 | C-shaped fixing device for lower end of annular fuel rod and lower pipe seat |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010448585.9A CN111681785A (en) | 2020-05-25 | 2020-05-25 | C-shaped fixing device for lower end of annular fuel rod and lower pipe seat |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111681785A true CN111681785A (en) | 2020-09-18 |
Family
ID=72434475
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010448585.9A Pending CN111681785A (en) | 2020-05-25 | 2020-05-25 | C-shaped fixing device for lower end of annular fuel rod and lower pipe seat |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111681785A (en) |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB892240A (en) * | 1959-05-04 | 1962-03-21 | Atomic Energy Authority Uk | Improvements in or relating to fuel elements for nuclear reactors |
| DE1589801A1 (en) * | 1966-01-17 | 1972-04-20 | Gen Electric | Fuel bundles for nuclear reactors |
| US4080253A (en) * | 1976-09-21 | 1978-03-21 | Westinghouse Electric Corporation | Expandable device for a nuclear fuel rod |
| JPS58121357A (en) * | 1982-01-13 | 1983-07-19 | Teijin Ltd | Tube plate securing method of cylindrical pressure container |
| US4514889A (en) * | 1983-11-03 | 1985-05-07 | Westinghouse Electric Corp. | Spring clip inserter tool |
| JPH11294688A (en) * | 1998-04-09 | 1999-10-29 | Fukuoka Marumoto Kk | Pillar height adjusting tool |
| US20010045743A1 (en) * | 1999-01-05 | 2001-11-29 | Martin H. Wieder | Quick coupler retention clip and method |
| TWM240492U (en) * | 2003-11-11 | 2004-08-11 | Hantech Corp | Improved C-shaped retention component |
| WO2011080717A2 (en) * | 2009-12-31 | 2011-07-07 | Teklas Kaucuk Sanayi Ve Ticaret A.S. | A quick connector element |
| CN104616706A (en) * | 2015-02-05 | 2015-05-13 | 喻杰 | Integrated pressure-resistant shell assembly |
| CN207731667U (en) * | 2017-12-19 | 2018-08-14 | 中国原子能科学研究院 | A kind of two-sided cooling annular fuel rod of dismountable segmented |
| CN109935350A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fixed two-sided cooling annular fuel rod in lower end |
| CN212675927U (en) * | 2020-05-25 | 2021-03-09 | 中国原子能科学研究院 | Fixing device of annular fuel rod |
-
2020
- 2020-05-25 CN CN202010448585.9A patent/CN111681785A/en active Pending
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB892240A (en) * | 1959-05-04 | 1962-03-21 | Atomic Energy Authority Uk | Improvements in or relating to fuel elements for nuclear reactors |
| DE1589801A1 (en) * | 1966-01-17 | 1972-04-20 | Gen Electric | Fuel bundles for nuclear reactors |
| US4080253A (en) * | 1976-09-21 | 1978-03-21 | Westinghouse Electric Corporation | Expandable device for a nuclear fuel rod |
| JPS58121357A (en) * | 1982-01-13 | 1983-07-19 | Teijin Ltd | Tube plate securing method of cylindrical pressure container |
| US4514889A (en) * | 1983-11-03 | 1985-05-07 | Westinghouse Electric Corp. | Spring clip inserter tool |
| JPH11294688A (en) * | 1998-04-09 | 1999-10-29 | Fukuoka Marumoto Kk | Pillar height adjusting tool |
| US20010045743A1 (en) * | 1999-01-05 | 2001-11-29 | Martin H. Wieder | Quick coupler retention clip and method |
| TWM240492U (en) * | 2003-11-11 | 2004-08-11 | Hantech Corp | Improved C-shaped retention component |
| WO2011080717A2 (en) * | 2009-12-31 | 2011-07-07 | Teklas Kaucuk Sanayi Ve Ticaret A.S. | A quick connector element |
| CN104616706A (en) * | 2015-02-05 | 2015-05-13 | 喻杰 | Integrated pressure-resistant shell assembly |
| CN207731667U (en) * | 2017-12-19 | 2018-08-14 | 中国原子能科学研究院 | A kind of two-sided cooling annular fuel rod of dismountable segmented |
| CN109935350A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of fixed two-sided cooling annular fuel rod in lower end |
| CN212675927U (en) * | 2020-05-25 | 2021-03-09 | 中国原子能科学研究院 | Fixing device of annular fuel rod |
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