CN106384610A - Fuel assembly compression system load evaluation method - Google Patents
Fuel assembly compression system load evaluation method Download PDFInfo
- Publication number
- CN106384610A CN106384610A CN201611024853.4A CN201611024853A CN106384610A CN 106384610 A CN106384610 A CN 106384610A CN 201611024853 A CN201611024853 A CN 201611024853A CN 106384610 A CN106384610 A CN 106384610A
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- Prior art keywords
- fuel assembly
- compression system
- pressing system
- minimum
- evaluation method
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C17/00—Monitoring; Testing ; Maintaining
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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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- 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 discloses a fuel assembly compression system load evaluation method, which solves the problem that in the prior art, no record of the fuel assembly compression system load evaluation method is discovered. A fuel assembly compression system needs to meet the following requirements that abs(F<h>+(A+P)cos theta <max>+F<I>cos alpha <min>) is lower than or equal to abs(F<y>); F<r> is lower than or equal to -M-F<h>-(A+P) cos theta <max>, wherein the M is the required minimum contact force of a fuel assembly and a pile core lower plate; the F<r> is the minimum compression force of the compression system; the F<h> is the maximum hydraulic acting force; the A is the buoyancy received by the fuel assembly; the P is the minimum gravity of the fuel assembly; the theta <max> is the inclination angle between a pile core and the fuel assembly; the F<I> is the impact load received by the fuel assembly; the F<y> is the minimum failure load of the compression system. The fuel assembly compression system load evaluation method has the advantages that the compression system is enabled to reliably and tightly compress the fuel assembly in the service life period; the failure risk of the compression system is reduced; the bending of the fuel assembly in the operation process due to excessive compression is avoided; the safety, the reliability, the economic performance and the like of the fuel assembly are improved, and the like.
Description
Technical field
The present invention relates to a kind of load evaluation method is and in particular to a kind of fuel assembly pressing system load evaluation method.
Background technology
Existing reactor fuel assemblies generally by some fuel rods, guide pipe, grid spacer, down tube base member and comprise
Upper tube base part of pressing system etc. forms, as shown in Figure 1.Pressing system is arranged on fuel assembly top, axial compression fuel
Assembly, is kept it to be contacted with lower core plate, and compensates the heat that fuel assembly irradiation growth and fuel assembly are with respect to in-pile component
Differential expansion.Pressing system load is too small can not to compress fuel assembly, cross conference and lead to fuel assembly to run bending and then affect control
The excellent scram of system, the therefore accurate evaluation of pressing system load for fuel assembly design it is critical that, but prior art
In there are no the record of load evaluation method for fuel assembly pressing system.
Content of the invention
Present invention mainly solves there are no the load evaluation method note for fuel assembly pressing system in prior art
The problem carrying, provides a kind of fuel assembly pressing system load of the clamping load being capable of effective evaluation fuel assembly pressing system
Evaluation method.
The present invention is achieved through the following technical solutions：
A kind of fuel assembly pressing system load evaluation method, this fuel assembly pressing system meets following requirements：
Fr≤-M-Fh-(A+P)cosθmax；abs(Fh+(A+P)cosθmax+FIcosαmin)≤abs(Fy)；
Wherein, M is the minimal-contact power with reactor core lower plate for the fuel assembly of requirement；
Fr：The minimum thrust of pressing system；
Fh：Maximum hydraulics active force；
A：The buoyancy that fuel assembly is subject to；
P：Fuel assembly minimum gravity；
θ：Angle of inclination between reactor core and fuel assembly；
α：Shock loading and the just axial angle of fuel assembly；
FI：The shock loading that fuel assembly is subject to；
Fy：Pressing system minimum failure load according to material yield strength or stress corrosion cracking threshold calculations.
By the above formula, the present invention is directed to the clamping load of fuel assembly pressing system from substrate hold-down function and transient state
Two aspects that lost efficacy are evaluated, with guarantee pressing system can within the phase in longevity reliable compression fuel assembly.
Wherein, substrate hold-down function evaluation ensures that fuel assembly (includes gravity, buoyancy, waterpower educational level, pressure in normal performance load
Thrust of clamping system etc. and its uncertainty) under do not disengage reactor core lower plate；The setting of the present invention achieves pressing system compression
Load accurate evaluation, obtains the suitable interval of fuel assembly thrust, it is possible to decrease pressing system failure risk, can avoid fuel
Assembly leads to bend in running due to excessive compression.Pressing system transient state lost efficacy and passed through answering of pressing system in evaluating
Power is less than the yield strength of its material, and for the material that there is stress corrosion cracking phenomenon, stress is less than its stress corrosion
The settings such as cracking threshold value are it is ensured that fuel assembly pressing system is in normally additional transient state load (as pump hypervelocity) and floating ring
Border or reactor occur the special load (as shock loading) that rare event brings not occur transient state to lose efficacy under acting on, and transient state disappears
After can recover its function.
Meanwhile, by realizing pressing system clamping load accurate evaluation, fuel assembly can be instructed to run and pressing system
Design, improves security, reliability and the economy of fuel assembly.And, substrate hold-down function evaluation also assures that combustion in the present invention
The reactor core that material assembly causes in the environment such as normal performance load and floating tilts and waves the additional forces leading to combines work
With under do not disengage reactor core lower plate.The evaluation method of the present invention is applied to fuel assembly and vertically stands on reactor core, reactor core and fuel assembly
Inclined, reactor core and fuel assembly are inclined and be subject to shock loading FIIn the presence of and reactor core and fuel stack
Part be in swinging condition inferior various in the case of load accurate evaluation.
The present invention compared with prior art, has such advantages as and beneficial effect：
1, the invention provides a kind of fuel assembly pressing system load evaluation method, has filled up in prior art and there are no
The blank recorded for the load evaluation method of fuel assembly pressing system, can instruct fuel assembly to run and set with pressing system
Meter；
2nd, the present invention enters in terms of substrate hold-down function and transient state inefficacy two for the clamping load of fuel assembly pressing system
Go evaluation it is ensured that pressing system reliable within the phase in longevity can compress fuel assembly, reduced pressing system failure risk, it is to avoid
Fuel assembly leads to bend in running due to excessive compression, improves security, reliability and the economy of fuel assembly
Property；
3rd, the present invention is applied to that fuel assembly vertically stands on reactor core, reactor core and fuel assembly is inclined, reactor core and combustion
Material assembly is inclined and is subject to shock loading FIIn the presence of and reactor core and fuel assembly be in multiple shapes such as swinging condition
The load evaluation of the pressing system under state, applied widely.
Brief description
Accompanying drawing described herein is used for providing the embodiment of the present invention is further understood, and constitutes of the application
Point, do not constitute the restriction to the embodiment of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of hold down gag and fuel assembly in prior art.
Fig. 2 is the hold down gag and fuel assembly stressing conditions schematic diagram in reactor core.
Mark and corresponding parts title in accompanying drawing：
1- hold down gag, 2- fuel assembly.
Specific embodiment
For making the object, technical solutions and advantages of the present invention become more apparent, with reference to embodiment and accompanying drawing, to this
Invention is described in further detail, and the exemplary embodiment of the present invention and its explanation are only used for explaining the present invention, do not make
For limitation of the invention.
Embodiment 1
A kind of fuel assembly pressing system load evaluation method, as depicted in figs. 1 and 2, this fuel assembly pressing system is full
Foot states requirement：
Fr≤-M-Fh-(A+P)cosθmax；abs(Fh+(A+P)cosθmax+FIcosαmin)≤abs(Fy)；
Wherein, M is the minimal-contact power with reactor core lower plate for the fuel assembly of requirement；
Fr：The minimum thrust of pressing system；
Fh：Maximum hydraulics active force；
A：The buoyancy that fuel assembly is subject to；
P：Fuel assembly minimum gravity；
θ：Angle of inclination between reactor core and fuel assembly；
α：Shock loading and the just axial angle of fuel assembly；
FI：The shock loading that fuel assembly is subject to；
Fy：Pressing system minimum failure load according to material yield strength or stress corrosion cracking threshold calculations.
In the present embodiment, fuel assembly vertically stands in reactor core, no tilts between reactor core and fuel assembly, i.e. θmaxFor 0 degree,
cosθmaxValue be 1.Meanwhile, fuel assembly be not affected by shock loading in the present embodiment, i.e. FIValue be 0.Now, this fuel
Assembly pressing system should meet the requirement of following formula：
Fr≤-M-Fh-(A+P)；abs(Fh+A+P)≤abs(Fy).
If the fuel assembly requiring in above-mentioned formula is 450N with minimal-contact power M of reactor core lower plate, maximum hydraulics is made
Firmly FhFor 12732N, the buoyancy A that fuel assembly is subject to is 740N, and fuel assembly minimum gravity P is -6480N.By above-mentioned public affairs
Formula can effectively determine minimum thrust F of pressing systemrShould be -7442N, pressing system minimum failure load FyShould be
6992N.
Embodiment 2
The present embodiment is with the difference of embodiment 1, and in the present embodiment, reactor core and fuel assembly are inclined, i.e. reactor core
Shape in an angle, as shown in Fig. 2 this angle is acute angle, now, should expire by this fuel assembly pressing system and fuel assembly between
The requirement of foot formula：
Fr≤-M-Fh-(A+P)cosθmax；abs(Fh+(A+P)cosθmax)≤abs(Fy).
If the fuel assembly requiring in above-mentioned formula is 450N with minimal-contact power M of reactor core lower plate, maximum hydraulics is made
Firmly FhFor 12732N, the buoyancy A that fuel assembly is subject to is 740N, and fuel assembly minimum gravity P is -6480N, reactor core and fuel
Allowable angle of inclination θ between assemblymaxFor 45 °.Minimum thrust F of pressing system can effectively be determined by above-mentioned formularShould
For -9124N, pressing system minimum failure load FyShould be 8674N.
Embodiment 3
The present embodiment is with the difference of embodiment 2, and in the present embodiment, reactor core and fuel assembly are inclined, i.e. reactor core
In an angle, this angle is acute angle to shape and fuel assembly between, and meanwhile, in the present invention, this fuel assembly is subject to shock loading FI
Effect, shock loading and the just axial angle of fuel assembly are α, as shown in Figure 2.
Now, this fuel assembly pressing system should meet the requirement of following formula：
Fr≤-M-Fh-(A+P)cosθmax；abs(Fh+(A+P)cosθmax+FIcosαmin)≤abs(Fy).
If the fuel assembly requiring in above-mentioned formula is 450N with minimal-contact power M of reactor core lower plate, maximum hydraulics is made
Firmly FhFor 12732N, the buoyancy A that fuel assembly is subject to is 740N, and fuel assembly minimum gravity P is -6480N, reactor core and fuel
Allowable angle of inclination θ between assemblymaxFor 45 °, fuel assembly is subject to shock loading FIFor 5000N, shock loading and fuel assembly
Just axial minimum angle αminFor 0 °.Minimum thrust F of pressing system can effectively be determined by above-mentioned formularShould be-
9124N, pressing system minimum failure load FyShould be 13674N.
Embodiment 4
The present embodiment is with the difference of embodiment 3, and in the present embodiment, reactor core and fuel assembly are in swinging condition, and maximum is shaken
Pivot angle is acute angle, less than θmax, now, this fuel assembly pressing system should meet the requirement of following formula：
Fr≤-M-Fh-(A+P)cosθmax；abs(Fh+(A+P)cosθmax+FIcosαmin)≤abs(Fy).
If the fuel assembly requiring in above-mentioned formula is 450N with minimal-contact power M of reactor core lower plate, maximum hydraulics is made
Firmly FhFor 12732N, the buoyancy A that fuel assembly is subject to is 740N, and fuel assembly minimum gravity P is -6480N, maximum angle of oscillation
θmaxFor 45 °, with fuel assembly center of gravity to overlapping, fuel assembly is subject to shock loading F to swing centerIFor 5000N, shock loading
Just axial minimum angle α with fuel assemblyminFor 0 °.The minimum compression of pressing system can effectively be determined by above-mentioned formula
Power FrShould be -9124N, pressing system minimum failure load FyShould be 13674N.
By above-mentioned setting, you can guarantee that pressing system reliable within the phase in longevity can compress fuel assembly, reduce compression system
System failure risk, it is to avoid fuel assembly leads to bend in running due to excessive compression, improves the safety of fuel assembly
Property, reliability and economy.
Above-described specific embodiment, has been carried out to the purpose of the present invention, technical scheme and beneficial effect further
Describe in detail, be should be understood that the specific embodiment that the foregoing is only the present invention, be not intended to limit the present invention
Protection domain, all any modification, equivalent substitution and improvement within the spirit and principles in the present invention, done etc., all should comprise
Within protection scope of the present invention.
Claims (1)
1. a kind of fuel assembly pressing system load evaluation method it is characterised in that this fuel assembly pressing system meet following
Require：
Fr≤-M-Fh-(A+P)cosθmax；abs(Fh+(A+P)cosθmax+FIcosαmin)≤abs(Fy)；
Wherein, M is the minimal-contact power with reactor core lower plate for the fuel assembly of requirement；
Fr：The minimum thrust of pressing system；
Fh：Maximum hydraulics active force；
A：The buoyancy that fuel assembly is subject to；
P：Fuel assembly minimum gravity；
θ：Angle of inclination between reactor core and fuel assembly；
α：Shock loading and the just axial angle of fuel assembly；
FI：The shock loading that fuel assembly is subject to；
Fy：Pressing system minimum failure load according to material yield strength or stress corrosion cracking threshold calculations.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611024853.4A CN106384610A (en) | 2016-11-18 | 2016-11-18 | Fuel assembly compression system load evaluation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611024853.4A CN106384610A (en) | 2016-11-18 | 2016-11-18 | Fuel assembly compression system load evaluation method |
Publications (1)
| Publication Number | Publication Date |
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| CN106384610A true CN106384610A (en) | 2017-02-08 |
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ID=57959034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611024853.4A Pending CN106384610A (en) | 2016-11-18 | 2016-11-18 | Fuel assembly compression system load evaluation method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107391868A (en) * | 2017-07-31 | 2017-11-24 | 中国核动力研究设计院 | A kind of fuel assembly pressing system nonlinear characteristic three-dimensional simulation computational methods |
| CN112446147A (en) * | 2020-11-20 | 2021-03-05 | 中国核动力研究设计院 | Fuel assembly compression system analysis method for improving compression force allowance |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202512906U (en) * | 2012-02-13 | 2012-10-31 | 中科华核电技术研究院有限公司 | Nuclear fuel assembly |
| CN103077752A (en) * | 2013-01-13 | 2013-05-01 | 中国科学院合肥物质科学研究院 | Fuel component and fixing method for liquid heavy metal cooling reactor |
| CN103698210A (en) * | 2013-12-10 | 2014-04-02 | 中国核动力研究设计院 | Comprehensive mechanical property test device of fuel assembly and test method thereof |
-
2016
- 2016-11-18 CN CN201611024853.4A patent/CN106384610A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202512906U (en) * | 2012-02-13 | 2012-10-31 | 中科华核电技术研究院有限公司 | Nuclear fuel assembly |
| CN103077752A (en) * | 2013-01-13 | 2013-05-01 | 中国科学院合肥物质科学研究院 | Fuel component and fixing method for liquid heavy metal cooling reactor |
| CN103698210A (en) * | 2013-12-10 | 2014-04-02 | 中国核动力研究设计院 | Comprehensive mechanical property test device of fuel assembly and test method thereof |
Non-Patent Citations (1)
| Title |
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| 张林 等: "燃料组件压紧部件分析研究", 《核动力工程》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107391868A (en) * | 2017-07-31 | 2017-11-24 | 中国核动力研究设计院 | A kind of fuel assembly pressing system nonlinear characteristic three-dimensional simulation computational methods |
| CN112446147A (en) * | 2020-11-20 | 2021-03-05 | 中国核动力研究设计院 | Fuel assembly compression system analysis method for improving compression force allowance |
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Application publication date: 20170208 |
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