CN207441261U - A kind of burnable poison assembly and reactor core - Google Patents
A kind of burnable poison assembly and reactor core Download PDFInfo
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- CN207441261U CN207441261U CN201721258818.9U CN201721258818U CN207441261U CN 207441261 U CN207441261 U CN 207441261U CN 201721258818 U CN201721258818 U CN 201721258818U CN 207441261 U CN207441261 U CN 207441261U
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- burnable poison
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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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Abstract
The utility model, which provides a kind of burnable poison assembly and reactor core, burnable poison assembly, to be included：At least two fuel rods, any one fuel rod at least two fuel rods includes pellet, fuel pellet coating and involucrum, the outer wall of the pellet is connected with the inner wall of the fuel pellet coating, there is air gap between the outer wall of the fuel pellet coating and the inner wall of the involucrum, the pitch of arbitrary two fuel rods is 9.6 12.1 millimeters at least two fuel rods, and the degree of enrichment of the burnable poison assembly is 30% 90%.The utility model embodiment can reduce the burnup rate of burnable poison, preferable to the reducing effect of the burnup rate of burnable poison in burnable poison assembly.
Description
Technical field
The utility model is related to technical field of nuclear power, more particularly to a kind of burnable poison assembly and reactor core.
Background technology
With the continuous development of science and technology, people are also more and more deep to the research of nuclear energy, in order to solve energy crisis, people
Increasingly pay close attention to nuclear energy power generation.Nuclear energy power generation has become a kind of important generation mode now, and to people’s lives
Bring larger facility.In the prior art, the reactivity of fuel assembly is usually reduced using burnable poison, and in order to improve
Component degree of enrichment, reduce refuelling component frequency, generally by fuel pellet increase gadolinium sesquioxide content come
The burnup rate of burnable poison in burnable poison assembly is reduced, but restricted application and is affected to fuel economy.
It is as it can be seen that currently poor to the reducing effect of the burnup rate of burnable poison in burnable poison assembly.
Utility model content
The utility model embodiment is designed to provide a kind of burnable poison assembly and reactor core, solves currently to flammable
The problem of reducing effect of the burnup rate of burnable poison is poor in poisonous substance component.
In order to achieve the above object, the utility model embodiment provides a kind of burnable poison assembly, including：At least two combustions
Charge bar, any one fuel rod at least two fuel rods include pellet, fuel pellet coating and involucrum, the pellet
Outer wall be connected with the inner wall of the fuel pellet coating, between the outer wall of the fuel pellet coating and the inner wall of the involucrum
There is an air gap, the pitch of arbitrary two fuel rods is 9.6-12.1 millimeters at least two fuel rods, the burnable poison group
The degree of enrichment of part is 30%-90%.
Optionally, the fuel pellet coating is boronation zirconium coating.
Optionally, the radius of the pellet is 0.4 centimetre, and the inside radius of the involucrum is 0.418 centimetre, the involucrum
Outer radius is 0.475 centimetre, and the width of the air gap is less than 0.018 centimetre.
Optionally, the degree of enrichment of the burnable poison assembly is 50%.
Optionally, the thickness of the boronation zirconium coating is 0.65 millimeter, and the degree of enrichment of -10 isotope of boron is in the pellet
19.9%.
Optionally, at least two fuel rods the pitch of arbitrary two fuel rods for 9.6,10.1,10.6,11.1,
11.6 or 12.1 millimeters.
Optionally, the degree of enrichment of -10 isotope of boron is enrichment boron in the pellet.
The utility model embodiment also provides a kind of reactor core, including above-mentioned burnable poison assembly.
A technical solution in above-mentioned technical proposal has the following advantages that or advantageous effect：
In the utility model embodiment, a kind of burnable poison assembly is provided, including：At least two fuel rods, it is described at least
Any one fuel rod in two fuel rods includes pellet, fuel pellet coating and involucrum, the outer wall of the pellet with it is described
The inner wall connection of fuel pellet coating, has air gap between the outer wall of the fuel pellet coating and the inner wall of the involucrum, described
The pitch of arbitrary two fuel rods is 9.6-12.1 millimeters at least two fuel rods, and the degree of enrichment of the burnable poison assembly is
30%-90%.Above-mentioned burnable poison assembly, by reducing the pitch of arbitrary two fuel rods to 9.6-12.1 millimeters, so as to change
Becoming the Water-Uranium Ratio in burnable poison assembly so that neutron spectra is hardened so that burnable poison declines the infiltration rate of neutron, from
And the burnup rate of burnable poison is reduced, it is preferable to the reducing effect of the burnup rate of burnable poison in burnable poison assembly.
Description of the drawings
Fig. 1 is a kind of structure diagram for burnable poison assembly that the utility model embodiment provides；
Fig. 2 is the burnup of the different burnable poison assembly of the thickness for the fuel pellet coating that the utility model embodiment provides
Responsiveness curve schematic diagram；
Fig. 3 is that the burnup reactivity of the different burnable poison assembly of the fuel rod pitch that provides of the utility model embodiment is bent
Line schematic diagram；
Fig. 4 is the burnable poison that the fuel rod pitch that the utility model embodiment provides is 11.1 millimeters but degree of enrichment is different
The burnup responsiveness curve schematic diagram of component；
Fig. 5 is the burnable poison that the fuel rod pitch that the utility model embodiment provides is 11.6 millimeters but degree of enrichment is different
The burnup responsiveness curve schematic diagram of component.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the technical scheme in the embodiment of the utility model is carried out
It clearly and completely describes, it is clear that described embodiment is the implementation of the utility model part of the embodiment rather than whole
Example.Based on the embodiment in the utility model, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
As shown in Figure 1, the utility model embodiment provides a kind of burnable poison assembly 1, including：At least two fuel rods
101, any one fuel rod 101 at least two fuel rods 101 includes pellet, fuel pellet coating and involucrum, institute
The outer wall for stating pellet is connected with the inner wall of the fuel pellet coating, and the outer wall of the fuel pellet coating is interior with the involucrum
There is air gap between wall, the pitch of arbitrary two fuel rods 101 is 9.6-12.1 millimeters at least two fuel rods 101, institute
The degree of enrichment for stating burnable poison assembly 1 is 30%-90%.
Wherein, above-mentioned burnable poison assembly 1 can be determined by following methods：It first can be according to length of the cycle come really
Determine the scope of the degree of enrichment of burnable poison assembly 1, while can also substantially determine the scope and fuel pellet of fuel rod pitch
The scope of coating layer thickness；Then according to the model of the scope of degree of enrichment, the scope of fuel rod pitch and fuel pellet coating layer thickness
It encloses, the fuel pellet coating layer thickness of the degree of enrichment of different numerical value, the fuel rod pitch of different numerical value and different numerical value can be selected
Corresponding reactivity is calculated, after repeatedly calculating and selecting, optimal degree of enrichment, fuel rod pitch and cartridge can be selected
Block coating layer thickness.Such as：The degree of enrichment of burnable poison assembly 1 can be selected as 30%, fuel pellet coating layer thickness is 0.10 milli
Rice, and fuel rod pitch is respectively 9.6mm, 10.1mm, 10.6mm, 11.1mm, 11.6mm and 12.1mm, is calculated above-mentioned different
The reactivity of burnable poison assembly corresponding to fuel rod pitch；It is also an option that the degree of enrichment of burnable poison assembly 1 is 35%,
Fuel pellet coating layer thickness be 0.10 millimeter, and fuel rod pitch be respectively 9.6mm, 10.1mm, 10.6mm, 11.1mm,
11.6mm and 12.1mm calculates the reactivity of the burnable poison assembly corresponding to above-mentioned different fuel rod pitch；It or can
To select fuel pellet coating layer thickness, as 0.10 millimeter, fuel rod pitch is respectively 10.6mm, and the enrichment of burnable poison assembly 1
Degree can be 30%, 35%, 40%, 45%, 50% or 55%, calculate the burnable poison assembly institute of above-mentioned different degree of enrichment
Corresponding reactivity.Similarly, it is also an option that the reaction of the burnable poison assembly corresponding to different fuel pellet coating layer thicknesses
Property.Optimized by successive ignition, so as to select the degree of enrichment of optimal fuel rod pitch, optimal burnable poison assembly
With optimal fuel pellet coating layer thickness.
Wherein, it is necessary to illustrate, all fuel rods can be marked with 101 in burnable poison assembly 1.
Wherein, burnable poison assembly 1 can not be limited including at least two fuel rods 101, the quantity of fuel rod 101.
Wherein, pellet can be the pellet of boracic.The pellet of above-mentioned boracic can be used for absorbing fuel assembly in nuclear reaction
The neutron of middle release.
Wherein, the fuel rod 101 that burnable poison assembly 1 includes, the pitch between arbitrary two fuel rods 101 can be
Unified, such as：Have label be respectively 1,2,3 and 4 four fuel rods, 101, No. 1 fuel rod 101 and No. 2 fuel rods 101 it
Between pitch can be 10 millimeters, then, corresponding, the pitch between No. 3 and No. 4 fuel rods 101 can also be 10 millimeters.
In addition, the pitch between No. 2 and No. 3 fuel rods 101 can also be 10 millimeters.It should be noted that arbitrary two fuel rods 101
Between pitch may not be it is unified, such as：Pitch between No. 1 fuel rod 101 and No. 2 fuel rods 101 can be 10
Millimeter, then the pitch between No. 3 and No. 4 fuel rods 101 can be 11 millimeters, certainly, No. 1 fuel rod 101 and No. 2 fuel rods
101 be that one group, No. 3 and No. 4 fuel rod 101 is one group.
In the utility model embodiment, a kind of burnable poison assembly is provided, including：At least two fuel rods, it is described at least
Any one fuel rod in two fuel rods includes pellet, fuel pellet coating and involucrum, the outer wall of the pellet with it is described
The inner wall connection of fuel pellet coating, has air gap between the outer wall of the fuel pellet coating and the inner wall of the involucrum, described
The pitch of arbitrary two fuel rods is 9.6-12.1 millimeters at least two fuel rods, and the degree of enrichment of the burnable poison assembly is
30%-90%.Above-mentioned burnable poison assembly, by reducing the pitch of arbitrary two fuel rods to 9.6-12.1 millimeters, so as to change
Becoming the Water-Uranium Ratio in burnable poison assembly so that neutron spectra is hardened so that burnable poison declines the infiltration rate of neutron, from
And the burnup rate of burnable poison is reduced, it is preferable to the reducing effect of the burnup rate of burnable poison in burnable poison assembly.Also
Degree of enrichment can be improved, reduces the frequency of refuelling component.
Optionally, the fuel pellet coating is boronation zirconium coating.
Optionally, the radius of the pellet is 0.4 centimetre, and the inside radius of the involucrum is 0.418 centimetre, the involucrum
Outer radius is 0.475 centimetre, and the width of the air gap is less than 0.018 centimetre.
Wherein, involucrum is the structure of hollow cylindrical, and inside radius can be 0.418 centimetre, and outer radius can be 0.475
Centimetre.In addition, the radius of pellet can be 0.4 centimetre, the shape or cylinder of pellet.The width of air gap is less than
It 0.018 centimetre, can be more convenient pellet being installed in involucrum.
In the utility model embodiment, the radius of pellet is 0.4 centimetre, and the inside radius of involucrum is 0.418 centimetre, involucrum
When outer radius is 0.475 centimetre, it can cause the more convenient manufacture of fuel rod of burnable poison assembly, the duration of manufacture is shorter,
So as to also more convenient on using.
Optionally, the degree of enrichment of the burnable poison assembly 1 is 50%.
In the utility model embodiment, the degree of enrichment of burnable poison assembly is higher, and usage time is longer, so as to reduce combustion
Expect the replacement rate of component.
Optionally, the thickness of the boronation zirconium coating is 0.65 millimeter, and the degree of enrichment of -10 isotope of boron is 19.9%.
Wherein, in fig. 2, abscissa can represent the energy that each ton of uranium generates in figure, and ordinate represents reactivity, together
It manages, abscissa is as ordinate expression meaning in Fig. 3-5.As shown in Fig. 2, when the pitch between fuel rod 101 is 11.1 millis
Rice, the degree of enrichment of burnable poison assembly 1 are 40%, but when coating layer thickness is respectively 0,0.05,0.10 and 0.15 millimeter, it is flammable
The curve of the reactivity of poisonous substance component 1.As can be seen from Figure 2, the thickness of boronation zirconium coating is bigger, and burnup responsiveness curve is lower,
Reactivity is also just smaller.So as to, it can be seen that, when other conditions are identical, coating layer thickness is thicker, and reactivity is smaller.
Wherein it is possible to the degree of enrichment of -10 isotope of boron in boronation zirconium coating is improved, such as：Can improve to 30%,
70% or 90%.The degree of enrichment of -10 isotope of boron is higher in boronation zirconium coating, then corresponding, required boronation zirconium coating
Thickness is smaller to keep -10 total amount of boron constant.
In the utility model embodiment, when the thickness of boronation zirconium coating is 0.65 millimeter, it can further reduce fuel
The reactivity of component further reduces the burnup rate of burnable poison.And the degree of enrichment of -10 isotope of boron is 19.9%, it can
Preferably to absorb neutron.
Optionally, the degree of enrichment of -10 isotope of boron is enrichment boron in the pellet.
Wherein, when the degree of enrichment of -10 isotope of boron in pellet is enrichment boron, i.e. the degree of enrichment of -10 isotope of boron is more than
19.9%, on the premise of the total amount for ensureing -10 isotope of boron is constant, zirconium boride coating layer thickness need to accordingly be thinned.Such as：Boron-
The degree of enrichment of 10 isotopes is 19.9%, and zirconium boride coating layer thickness can be 0.65 millimeter；The degree of enrichment of -10 isotope of boron can be with
For 39.8%, zirconium boride coating layer thickness can be 0.325 millimeter.
In the utility model embodiment, by improving the degree of enrichment of core -10 isotope of boron in the block, it can reduce accordingly
Zirconium boride coating layer thickness.
Optionally, at least two fuel rods the pitch of arbitrary two fuel rods 101 for 9.6,10.1,10.6,
11.1st, 11.6 or 12.1 millimeters.
Wherein, as shown in figure 3, burnable poison assembly 1 degree of enrichment for 40%, coating layer thickness for 0.05 millimeter and
When the pitch of arbitrary two fuel rods 101 is respectively 9.6,10.1,10.6,11.1,11.6,12.1 and 12.6 millimeters, Ke Yicong
It is learnt on figure, when pitch is from 9.6 to 11.1 millimeters, reactive maximum is gradually reduced, and the curve of reactivity
It is gradually to become gentle；When pitch is from 11.1 to 12.6, reactive maximum be gradually it is increased, and reactivity song
Line is also gradually to become more and more precipitous.So as to learn, the pitch of fuel rod 101 closer to 11.1 millimeters when,
Its reactivity is smaller.The curve of reactivity is also gentler.
Wherein, as shown in figure 4, the pitch of fuel rod 101 takes 11.1 millimeters, the degree of enrichment of burnable poison assembly 1 takes respectively
30%th, 35%, 40%, 45% and 50% when, and when coating layer thickness takes 0.20,0.28,0.43,0.60 and 0.70 millimeter respectively,
Burnup responsiveness curve is as shown in Figure 4；As shown in figure 5, the pitch of fuel rod 101 takes 11.6 millimeters, the richness of burnable poison assembly 1
When intensity takes 30%, 35%, 40%, 45% and 50% respectively, and coating layer thickness takes 0.20,0.28,0.43,0.53 and respectively
At 0.65 millimeter, burnup responsiveness curve is as shown in Figure 5.By comparison diagram 4 and Fig. 5, can be clear that, in burnable poison
Under the influence of the pitch three of the degree of enrichment of component 1, coating layer thickness and fuel rod, burnup responsiveness curve shows on the whole
Following features：The degree of enrichment of burnable poison assembly 1 is bigger, and the required coating layer thickness of compacting reactivity is thicker, fuel rod 101 it is excellent
Change pitch near 11.1 millimeters.
In the utility model embodiment, by setting the pitch of fuel rod for 9.6,10.1,10.6,11.1,11.6 or
12.1 millimeters, neutron spectra can be hardened, makes the burnup rate reduction of burnable poison.It should be noted that preferred fuel rod
Pitch is 11.1 millimeters.
The utility model embodiment also provides a kind of reactor core, including above-mentioned burnable poison assembly 1.
In the utility model embodiment, the degree of enrichment of fuel can be very high in the reactor core including above-mentioned burnable poison assembly,
Usage time can be very long, so as to reduce the frequency of refuelling component, more convenient use to this reactor core.
The above is only specific embodiment of the present utility model, but the scope of protection of the utility model is not limited to
In this, in the technical scope that any one skilled in the art discloses in the utility model, variation can be readily occurred in
Or replace, it should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model should be wanted with right
Subject to the protection domain asked.
Claims (6)
1. a kind of burnable poison assembly, which is characterized in that including：At least two fuel rods, at least two fuel rods
Any one fuel rod includes pellet, fuel pellet coating and involucrum, the outer wall of the pellet and the fuel pellet coating
Inner wall connects, and has air gap, at least two fuel rods between the outer wall of the fuel pellet coating and the inner wall of the involucrum
In arbitrary two fuel rods pitch be 9.6-12.1 millimeters.
2. burnable poison assembly according to claim 1, which is characterized in that the fuel pellet coating applies for zirconium boride
Layer.
3. burnable poison assembly according to claim 1 or 2, which is characterized in that the radius of the pellet is 0.4 centimetre,
The inside radius of the involucrum is 0.418 centimetre, and the outer radius of the involucrum is 0.475 centimetre, and the width of the air gap is less than
0.018 centimetre.
4. burnable poison assembly according to claim 2, which is characterized in that the thickness of the boronation zirconium coating is 0.65 milli
Rice.
5. burnable poison assembly according to claim 4, which is characterized in that arbitrary two at least two fuel rods
The pitch of fuel rod is 9.6,10.1,10.6,11.1,11.6 or 12.1 millimeters.
6. a kind of reactor core, which is characterized in that including claim 1-5 any one of them burnable poison assemblies.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201721258818.9U CN207441261U (en) | 2017-09-28 | 2017-09-28 | A kind of burnable poison assembly and reactor core |
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|---|---|---|---|
| CN201721258818.9U CN207441261U (en) | 2017-09-28 | 2017-09-28 | A kind of burnable poison assembly and reactor core |
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| CN207441261U true CN207441261U (en) | 2018-06-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113674875A (en) * | 2021-07-14 | 2021-11-19 | 中国核动力研究设计院 | Fast spectrum reactor core design method and reactor core structure |
-
2017
- 2017-09-28 CN CN201721258818.9U patent/CN207441261U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113674875A (en) * | 2021-07-14 | 2021-11-19 | 中国核动力研究设计院 | Fast spectrum reactor core design method and reactor core structure |
| CN113674875B (en) * | 2021-07-14 | 2024-01-12 | 中国核动力研究设计院 | Quick spectrum reactor core design method and core structure |
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