CN109585038A - A kind of burnable poison assembly and reactor core - Google Patents
A kind of burnable poison assembly and reactor core Download PDFInfo
- Publication number
- CN109585038A CN109585038A CN201710900284.3A CN201710900284A CN109585038A CN 109585038 A CN109585038 A CN 109585038A CN 201710900284 A CN201710900284 A CN 201710900284A CN 109585038 A CN109585038 A CN 109585038A
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- Prior art keywords
- burnable poison
- fuel
- pellet
- enrichment
- poison assembly
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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
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
-
- 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
- G21C3/326—Bundles of parallel pin-, rod-, or tube-shaped fuel elements comprising fuel elements of different composition; comprising, in addition to the fuel elements, other pin-, rod-, or tube-shaped elements, e.g. control rods, grid support rods, fertile rods, poison rods or dummy rods
- G21C3/328—Relative disposition of the elements in the bundle lattice
-
- 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 present invention provides a kind of burnable poison assembly and reactor core, burnable poison assembly includes: 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 connect 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 any 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 embodiment of the present invention 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 present invention relates to technical field of nuclear power, in particular to a kind of burnable poison assembly and reactor core.
Background technique
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 gives people's lives
Bring biggish convenience.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.
As it can be seen that currently poor to the reducing effect of the burnup rate of burnable poison in burnable poison assembly.
Summary of the invention
The embodiment of the present invention is designed to provide a kind of burnable poison assembly and reactor core, solves currently to burnable poison
The poor problem of the reducing effect of the burnup rate of burnable poison in component.
In order to achieve the above object, the embodiment of the present invention provides a kind of burnable poison assembly, comprising: at least two fuel
Stick, any one fuel rod at least two fuel rods include pellet, fuel pellet coating and involucrum, the pellet
Outer wall is connect with the inner wall of the fuel pellet coating, is had between the outer wall of the fuel pellet coating and the inner wall of the involucrum
Air gap, the pitch of any two fuel rods is 9.6-12.1 millimeters at least two fuel rods, the burnable poison assembly
Degree of enrichment be 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 boronation zirconium coating with a thickness of 0.65 millimeter, the degree of enrichment of -10 isotope of boron is in the pellet
19.9%.
Optionally, at least two fuel rods any two fuel rods pitch be 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 embodiment of the present invention also provides a kind of reactor core, including above-mentioned burnable poison assembly.
A technical solution in above-mentioned technical proposal have the following advantages that or the utility model has the advantages that
In the embodiment of the present invention, a kind of burnable poison assembly is provided, comprising: at least two fuel rods, described at least two
Any one fuel rod in fuel rod includes pellet, fuel pellet coating and involucrum, the outer wall of the pellet and the fuel
The inner wall of pellet coating connects, and has air gap between the outer wall of the fuel pellet coating and the inner wall of the involucrum, it is described at least
The pitch of any two fuel rods is 9.6-12.1 millimeters in two fuel rods, and the degree of enrichment of the burnable poison assembly is
30%-90%.Above-mentioned burnable poison assembly, by the pitch of any two fuel rods of reduction to 9.6-12.1 millimeters, to change
Become 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.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of burnable poison assembly provided in an embodiment of the present invention；
Fig. 2 is the burnup reaction of the different burnable poison assembly of the thickness of fuel pellet coating provided in an embodiment of the present invention
Linearity curve schematic diagram；
Fig. 3 is that the burnup responsiveness curve of the different burnable poison assembly of fuel rod pitch provided in an embodiment of the present invention shows
It is intended to；
Fig. 4 is the burnable poison assembly that fuel rod pitch provided in an embodiment of the present invention is 11.1 millimeters but degree of enrichment is different
Burnup responsiveness curve schematic diagram；
Fig. 5 is the burnable poison assembly that fuel rod pitch provided in an embodiment of the present invention is 11.6 millimeters but degree of enrichment is different
Burnup responsiveness curve schematic diagram.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
As shown in Figure 1, the embodiment of the present invention provides a kind of burnable poison assembly 1, comprising: at least two fuel rods 101, institute
Stating any one fuel rod 101 at least two fuel rods 101 includes pellet, fuel pellet coating and involucrum, the pellet
Outer wall connect 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 air gap, the pitch of any two fuel rods 101 is 9.6-12.1 millimeters at least two fuel rods 101, described flammable
The degree of enrichment of poisonous substance component 1 is 30%-90%.
Wherein, above-mentioned burnable poison assembly 1 can be determined by following methods: first can be according to length of the cycle come really
Determine the range of the degree of enrichment of burnable poison assembly 1, while can also substantially determine the range and fuel pellet of fuel rod pitch
The range of coating layer thickness；Then according to the model of the range of degree of enrichment, the range of fuel rod pitch and fuel pellet coating layer thickness
It encloses, can choose 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
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 that can choose burnable poison assembly 1 is 30%, and 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 burnable poison assembly corresponding to above-mentioned different fuel rod pitch；Or it can
To select fuel pellet coating layer thickness for 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 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 should be noted that all fuel rods can be marked with 101 in burnable poison assembly 1.
Wherein, burnable poison assembly 1 may include at least two fuel rods 101, and the quantity of fuel rod 101 is without limitation.
Wherein, pellet can be the pellet of boracic.The pellet of above-mentioned boracic can be used to absorb fuel assembly in nuclear reaction
The neutron of middle release.
Wherein, the fuel rod 101 for including in burnable poison assembly 1, the pitch between any two fuel rods 101 can be
It is 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 rod 101 it
Between pitch can be 10 millimeters, then, corresponding, the pitch between No. 3 and No. 4 fuel rods 101 is also possible to 10 millimeters.
In addition, the pitch between No. 2 and No. 3 fuel rods 101 is also possible to 10 millimeters.It should be noted that any two fuel rods 101
Between pitch may not be it is unified, such as: the pitch between No. 1 fuel rod 101 and No. 2 fuel rod 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 rod
101 be one group, No. 3 and No. 4 fuel rod 101 be one group.
In the embodiment of the present invention, a kind of burnable poison assembly is provided, comprising: at least two fuel rods, described at least two
Any one fuel rod in fuel rod includes pellet, fuel pellet coating and involucrum, the outer wall of the pellet and the fuel
The inner wall of pellet coating connects, and has air gap between the outer wall of the fuel pellet coating and the inner wall of the involucrum, it is described at least
The pitch of any two fuel rods is 9.6-12.1 millimeters in two fuel rods, and the degree of enrichment of the burnable poison assembly is
30%-90%.Above-mentioned burnable poison assembly, by the pitch of any two fuel rods of reduction to 9.6-12.1 millimeters, to change
Become 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, the frequency of refuelling component is reduced.
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 of pellet may be cylinder.The width of air gap is less than
It 0.018 centimetre, can be more convenient for pellet to be installed in involucrum.
In the embodiment of the present invention, the radius of pellet is 0.4 centimetre, and the inside radius of involucrum is 0.418 centimetre, outer the half of involucrum
When diameter is 0.475 centimetre, the more convenient manufacture of the fuel rod of burnable poison assembly can be made, the duration of manufacture is shorter, thus
Also more convenient in use.
Optionally, the degree of enrichment of the burnable poison assembly 1 is 50%.
In the embodiment of the present invention, the degree of enrichment of burnable poison assembly is higher, longer using the time, to reduce fuel stack
The replacement rate of part.
Optionally, the boronation zirconium coating with a thickness of 0.65 millimeter, the degree of enrichment of -10 isotope of boron is 19.9%.
Wherein, in Fig. 2, abscissa can indicate that the energy that each ton of uranium generates, ordinate indicate reactivity in figure, 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 reactive curve 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.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 be improved 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 embodiment of the present invention, when boronation zirconium coating is with a thickness of 0.65 millimeter, fuel assembly can be further decreased
Reactivity, that is, further decrease the burnup rate of burnable poison.And the degree of enrichment of -10 isotope of boron is 19.9%, Ke Yigeng
Good absorption 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 greater than
19.9%, under the premise of the total amount of guarantee -10 isotope of boron is constant, zirconium boride coating layer thickness need to be accordingly 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
It is 39.8%, zirconium boride coating layer thickness can be 0.325 millimeter.
In the embodiment of the present invention, by improving the degree of enrichment of -10 isotope of boron in pellet, boronation can be reduced accordingly
Zirconium coating thickness.
Optionally, at least two fuel rods any two fuel rods 101 pitch be 9.6,10.1,10.6,
11.1,11.6 or 12.1 millimeters.
Wherein, as shown in figure 3, the degree of enrichment in burnable poison assembly 1 is 40%, coating layer thickness is 0.05 millimeter, and
When the pitch of any 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 from 9.6 to 11.1 millimeters of pitch, reactive maximum value is gradually reduced, and reactive curve
Gradually become flat；When pitch from 11.1 to 12.6, reactive maximum value is gradually increased, and reactive song
Line is also gradually to become more and more precipitous.So as to learn, when the pitch of fuel rod 101 is closer to 11.1 millimeters,
Its reactivity is smaller.Reactive curve 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%, 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 embodiment of the present invention, the pitch by the way that fuel rod is arranged is 9.6,10.1,10.6,11.1,11.6 or 12.1
Millimeter, can harden neutron spectra, reduce the burnup rate of burnable poison.It should be noted that the pitch of preferred fuel rod
It is 11.1 millimeters.
The embodiment of the present invention also provides a kind of reactor core, including above-mentioned burnable poison assembly 1.
In the embodiment of the present invention, the degree of enrichment of fuel can be very high in the reactor core including above-mentioned burnable poison assembly, uses
Time can be very long, so that the frequency of refuelling component is reduced, more convenient use to this reactor core.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (8)
1. a kind of burnable poison assembly characterized by comprising 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 connection, there is air gap, at least two fuel rods between the outer wall of the fuel pellet coating and the inner wall of the involucrum
In the pitch of any two fuel rods be 9.6-12.1 millimeter, the degree of enrichment of the burnable poison assembly is 30%-90%.
2. burnable poison assembly according to claim 1, which is characterized in that the fuel pellet coating is zirconium boride painting
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 3, which is characterized in that the degree of enrichment of the burnable poison assembly is
50%.
5. burnable poison assembly according to claim 2, which is characterized in that the boronation zirconium coating with a thickness of 0.65 milli
Meter, the degree of enrichment of -10 isotope of boron is 19.9% in the pellet.
6. burnable poison assembly according to claim 5, which is characterized in that any 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.
7. burnable poison assembly according to claim 2, which is characterized in that the enrichment of -10 isotope of boron in the pellet
Degree is enrichment boron.
8. a kind of reactor core, which is characterized in that including the described in any item burnable poison assemblies of claim 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900284.3A CN109585038A (en) | 2017-09-28 | 2017-09-28 | A kind of burnable poison assembly and reactor core |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710900284.3A CN109585038A (en) | 2017-09-28 | 2017-09-28 | A kind of burnable poison assembly and reactor core |
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| Publication Number | Publication Date |
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| CN109585038A true CN109585038A (en) | 2019-04-05 |
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ID=65913886
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| CN201710900284.3A Pending CN109585038A (en) | 2017-09-28 | 2017-09-28 | A kind of burnable poison assembly and reactor core |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112420223A (en) * | 2020-11-18 | 2021-02-26 | 中国核动力研究设计院 | Long-circulation refueling loading method for pressurized water reactor core based on gadolinium enrichment |
| 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 |
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| CN112420223A (en) * | 2020-11-18 | 2021-02-26 | 中国核动力研究设计院 | Long-circulation refueling loading method for pressurized water reactor core based on gadolinium enrichment |
| 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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