CN202205468U - Conical positioning grid of pressurized water reactor double-sided cooling fuel rod - Google Patents
Conical positioning grid of pressurized water reactor double-sided cooling fuel rod Download PDFInfo
- Publication number
- CN202205468U CN202205468U CN2011202522898U CN201120252289U CN202205468U CN 202205468 U CN202205468 U CN 202205468U CN 2011202522898 U CN2011202522898 U CN 2011202522898U CN 201120252289 U CN201120252289 U CN 201120252289U CN 202205468 U CN202205468 U CN 202205468U
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- Prior art keywords
- fuel rod
- grid
- band
- water reactor
- otch
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- 239000000446 fuel Substances 0.000 title claims abstract description 79
- 238000001816 cooling Methods 0.000 title claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 125000006850 spacer group Chemical group 0.000 claims description 33
- 238000005476 soldering Methods 0.000 claims description 5
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000003319 supportive effect Effects 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000003758 nuclear fuel Substances 0.000 description 3
- 229910001093 Zr alloy Inorganic materials 0.000 description 2
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004449 solid propellant Substances 0.000 description 2
- 241000216843 Ursus arctos horribilis Species 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000004992 fission Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
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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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- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
The utility model discloses a conical positioning grid of a pressurized water reactor double-sided cooling fuel rod. The conical positioning grid comprises a grid frame formed by stripes, a conical support piece is installed on the grid frame, wherein the conical part of the conical support piece is higher than the grid frame. The utility model provides the conical positioning grid of the pressurized water reactor double-sided cooling fuel rod which has the advantages of simple structure and convenience in manufacture and installation.
Description
Technical field
The utility model relates to the nuclear reactor field of engineering technology, the taper grid spacer of the two-sided cooling fuel rod of particularly a kind of presurized water reactor.
Background technology
In the nuclear power plant reactor operational process, the performance of nuclear fuel is one of key factor that influences nuclear reactor safety and economy.Aspect consideration of power density, margin of safety, unloading burnup and cost of electricity-generating, fuel temperature all is a very important references index.In order to reduce the fuel element failure rate and to improve assembly life-span, people constantly improve the quality of fuel and cladding materials, as using new zirconium alloy, big crystal grain pellet etc.Yet the benefit people of raising power density are familiar with less, and it can improve the economic benefit of nuclear power plant greatly.Usually, nuclear fuel all is designed to columned, the about 9mm of diameter, and the volume ratio of water and fuel is about 1.7, and cooling medium flows through outside involucrum.The 4th generation the presurized water reactor annular fuel inside and outside two involucrums are arranged, cooling medium is taken away the heat that fuel sends from inside and outside both sides simultaneously.Compare with traditional filled circles column fuel, the benefit of annular fuel is under very high linear power density, and the operational centre temperature of fuel is still very low, and the energy of storing in the fuel is less, fission gas discharges less.It is better to be expected under normal irradiation and the operation transient fuel performance, can reach higher burnup.Fig. 1 is the structural representation of solid fuel rod, the structural representation of Fig. 2 annular fuel rod.
Though the fuel rod of two-sided cooling can improve cooling performance and fuel stability and obtain high burnup and output power; Yet; For the fuel rod that makes two-sided cooling and existing pressurized water reactor core adapt, what the physical dimension of annular fuel assembly must be with existing presurized water reactor is consistent; So the rod footpath of the annular fuel rod of two-sided cooling increases to some extent, and brings interrod spacing to increase, the excellent gap between adjacent like this two fuel rods becomes narrow, and the gap between fuel rod and the screen work band reduces.
Pressurized-water reactor nuclear power plant with million kilowatt; Traditional cylindric fuel rod is to arrange (as shown in Figure 3) with the mode of 17 * 17-25; Representing fuel rod, fuel rod diameter D with circle grey background color, that diameter is less among Fig. 3 is 9.5mm, and interrod spacing P is 12.63mm; The rod gap is 3.11mm, and P/D is 1.3264.Do not represent the control rod guide pipe with circle background color, that diameter is bigger.The grid spacer of assembly is formed by the band right-angled intersection of thin slice; Form 289 square grid, wherein 264 fuel rod grid and 24 guide pipe grid, the former supports fuel rod; Insert guide pipe in the latter and also and between the guide pipe be welded to connect, one of the center is flux supervision pipe grid.Generally along assembly vertically, 8 grid spacers are arranged with certain separation, by their realize fuel rod axially and radial location.Each fuel rod grid has 6 strong points to each fuel rod; Wherein two is longitudinal spring, and they lay respectively on two sides of fuel rod grid, constitutes 2 elastic supports to fuel rod; There are 4 to be pit; They be positioned in couples two springs about, and respectively on two other side, constitute rigid support to fuel rod.If use the fuel rod of two-sided cooling; Suppose to arrange (as shown in Figure 4) by 13 * 13-9, the annulus of band black matrix look is represented two-sided cooling fuel rod among the figure, does not represent the control rod guide pipe with the circle of background color; The outer envelope diameter D of ring-type fuel rod is 15.367mm; P is 16.51mm, and excellent gap is 1.143mm, and P/D is 1.0734.If the grid spacer of assembly is still formed by the band right-angled intersection; Comprise fuel rod grid and guide pipe grid, so, because the excellent gap of ring-type fuel rod is merely 1.143mm; The beam thickness of supposing grid spacer is 0.3mm, and rod will be reduced to 0.42mm from 1.45mm with the gap of screen work band so.
Tradition PWR fuel assembly grid spacer histogram is as shown in Figure 5; Each fuel rod is inserted in the square grid of being made up of screen work band intersection; Wherein a convexity is arranged towards the three curved springs fuel rod cylindrical, longitudinally, strip on two sides, constitute 2 elastic supports fuel rod.Then respectively there is the recess of two convexities towards the fuel rod cylindrical two other side, constitutes 4 rigid supports to fuel rod.Each fuel rod receives the support and the location of two springs and four recesses.If the screen work band is to be processed by nickel-base alloy; Spring and recess just are stamped to form by band itself, and two recesses are positioned at the upper and lower side of three curved springs of strip, and towards opposite with spring; Be that they play a supportive role to the fuel rod of band both sides respectively, Here it is usually said monometallic screen work.If the screen work band is to be processed by zircaloy, spring is fitted on the screen work band promptly usually said bimetal grid after just being formed by other nickel-base alloy arrowband punching press with spot welding method.Obviously,,, do not have enough spatial placement longitudinal springs, can not use existing fuel rod supporting construction because narrow gaps between the fuel rod dative grizzly bar band is less than 0.5mm for the fuel rod of two-sided cooling.
In United States Patent (USP) prospectus US2010/0027734A1, a kind of grid spacer of fuel rod is disclosed, this grid spacer also is to adopt the band right-angled intersection to form; The support component of screen work moves to the diagonal line place of grid; Though solved the support of presurized water reactor annular fuel rod and the problem of location like this, this grid spacer structure is complicated, and the manufacturing process difficulty is big; The elastic support of the band that wherein adopts adopts press-working spring; Elastic support receives in the reactor operation process and causes laxly under the influence of long-term souring easily, reduces the resiliency supported ability, causes the instability of fuel rod.And this ribbon construction complex process, Production Time is longer, installs complicated.
There is pertinent literature to disclose the grid spacer of reactor in the prior art at present; In the patent documentations such as Chinese patent instructions CN86102224A, CN87100909A, CN1140885A, CN1820326A grid spacer is disclosed for example; All to be tabular materials of adopting band or similar band assemble with the mode of right-angled intersection this type grid spacer; Grid spacer is made cumbersome, and uses to existing s Nuclear Plant design.And the support of nuclear reactor fuel rod and location are the cores of reactor safety operation; Must seek fuel rod support and orientation problem that new solution improves the annular fuel assembly for this reason, but not have reference to spell out the direction of dealing with problems so far as yet.Therefore the grid spacer of researching and developing a kind of high security is the active demand of China's presurized water reactor annular fuel assembly.
Summary of the invention
The utility model has overcome the deficiency that existing grid spacer is used in the annular fuel assembly, a kind of taper grid spacer of simple in structure, easy to make, the two-sided cooling fuel rod of easy-to-install presurized water reactor is provided.
In order to solve the problems of the technologies described above, the utility model is realized through following technical scheme:
The taper grid spacer of the two-sided cooling fuel rod of a kind of presurized water reactor comprises the grid frame of being made up of band, and key is that conical supports is installed on the grid frame, and wherein the tapering part of conical supports exceeds grid frame.
The utility model is all right:
Described conical supports is connected to form by hollow circular-tube and conical tube two parts; The hollow circular-tube of described conical supports inserts right-angled intersection place of grid frame band, around the point of crossing of band; The end of the tapering part of described conical supports has some otch; Described grid frame is intersected each other by the band of rectangular tab and soldering is formed.
Compared with prior art, the beneficial effect of the utility model is:
The band that the utility model uses is formed by the rectangular tab fluting, does not need to be provided with tradition complicated support and positioning element on the band again, and the structure of band is simplified more, manufactures convenient.Conical supports is installed on the framework of grid spacer, and its tapering part is positioned at the upper end of framework, and safe reliability is higher, and the installation of grid spacer is more prone to.
Description of drawings
The schematic cross-section of Fig. 1 solid fuel rod
The schematic cross-section of Fig. 2 annular fuel rod
The fuel assembly sectional view that the fuel rod that Fig. 3 is traditional is arranged
The sectional view of Fig. 4 annular fuel arrangements of components
The PWR fuel assembly grid spacer band synoptic diagram that Fig. 5 is traditional
Fig. 6 grid spacer band I synoptic diagram
Fig. 7 grid spacer band II synoptic diagram
Fig. 8 conical supports synoptic diagram
The grid frame synoptic diagram that Fig. 9 grid spacer band I and band II form
Figure 10 grid spacer structural representation
1 otch I-B, 2 otch I-A, 3 otch I-C, 4 otch II-B, 5 otch II-C, 6 otch II-A, 7 otch III-A, 8 otch III-B, 9 otch III-C, 10 otch III-D, 11 otch III-E
Embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail:
Grid spacer is the screen work band I as shown in Figure 6 that processed by rectangular tab and band II as shown in Figure 7; Mode with right-angled intersection constitutes square fuel rod lattice framework; As shown in Figure 9; And the elastic supporting member for supporting optical member of taper as shown in Figure 8 (broadening formation), common soldering is formed together, and is shown in figure 10.Support member is positioned at right-angled intersection place of grid, around the point of crossing, fuel rod is played a supportive role.
Otch II-A6 length on the otch I-A2 of screen work band I and the screen work band II is the half the of strip width.Both sides equally spaced layout otch I-B 1 and otch I-C 3 at the otch I-A 2 of band I; In like manner; Is that otch II-B 4 and otch II-C 5 are equidistantly arranged in the center at band II opposite side with otch II-A 6; Wherein the spacing of otch I-B 1 and otch I-A2 equates with the spacing of otch II-A6 and otch II-B 4, and band I inserts with otch II-A6 by otch I-A2 with band II mutually, and constitutes square fuel rod lattice framework with the mode of right-angled intersection.The opening direction of otch I-B 1, otch I-C 3 and otch II-B 4, otch II-C 5 is consistent, or they are all on the top of band, or all in the bottom of band, decides at a distance from the shape and size of cone shape support member therebetween.
Conical supports can adopt dual-purpose mode to process; A kind of for to constitute by hollow circular-tube and conical tube two parts; Hollow circular-tube has otch III-A 7, otch III-B 8, otch III-C 9, otch III-D 10 and grid otch I-B 1, otch I-C 3, otch II-B 4, otch II-C 5 matches; Conical tube partly exceeds the fuel assembly grid, has the spring that some otch III-E11 form the split pin formula above the conical tube, and fuel rod is played a supportive role.
The another kind of conical supports is processed mode for to be processed by the hollow circular-tube integral type, and hollow circular-tube has some otch for one section, and notch portion is made into taper (broadening formation) through impact style, forms the spring of split pin formula, and fuel rod is played a supportive role.
The installation process of grid spacer is following:
At first; Band I and band II are intersected and a square fuel rod lattice framework is formed in soldering each other; And then right-angled intersection place of the support member of taper (broadening formation) being inserted the grid band; Through soldering support member is fitted within these two independent parts of band at last, constitute a complete grid spacer.The conical surface through support member contacts with the fuel rod outside surface, plays support and positioning action to fuel rod.
Claims (5)
1. the taper grid spacer of the two-sided cooling fuel rod of presurized water reactor comprises the grid frame of being made up of band, it is characterized in that, conical supports is installed on the grid frame, and wherein the tapering part of conical supports exceeds grid frame.
2. the taper grid spacer of the two-sided cooling fuel rod of a kind of presurized water reactor according to claim 1 is characterized in that described conical supports is connected to form by hollow circular-tube and conical tube two parts.
3. the taper grid spacer of the two-sided cooling fuel rod of a kind of presurized water reactor according to claim 2 is characterized in that, the hollow circular-tube of described conical supports inserts right-angled intersection place of grid frame band.
4. the taper grid spacer of the two-sided cooling fuel rod of a kind of presurized water reactor according to claim 1 is characterized in that the tapering part of described conical supports has otch.
5. the taper grid spacer of the two-sided cooling fuel rod of a kind of presurized water reactor according to claim 1 is characterized in that, described grid frame is intersected each other by the band of rectangular tab and soldering is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202522898U CN202205468U (en) | 2011-07-18 | 2011-07-18 | Conical positioning grid of pressurized water reactor double-sided cooling fuel rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202522898U CN202205468U (en) | 2011-07-18 | 2011-07-18 | Conical positioning grid of pressurized water reactor double-sided cooling fuel rod |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202205468U true CN202205468U (en) | 2012-04-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011202522898U Expired - Lifetime CN202205468U (en) | 2011-07-18 | 2011-07-18 | Conical positioning grid of pressurized water reactor double-sided cooling fuel rod |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202205468U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109935349A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end |
| CN111477359A (en) * | 2020-05-25 | 2020-07-31 | 中国原子能科学研究院 | Fuel location grillwork |
-
2011
- 2011-07-18 CN CN2011202522898U patent/CN202205468U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN109935349A (en) * | 2017-12-19 | 2019-06-25 | 中国原子能科学研究院 | A kind of cooling annular fuel assembly of the fixed square double-sided in fuel rod lower end |
| CN111477359A (en) * | 2020-05-25 | 2020-07-31 | 中国原子能科学研究院 | Fuel location grillwork |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120425 |
|
| CX01 | Expiry of patent term |