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WO2022061689A1 - Crayon de poison consommable et assemblage combustible contenant un crayon de poison consommable - Google Patents

Crayon de poison consommable et assemblage combustible contenant un crayon de poison consommable Download PDF

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Publication number
WO2022061689A1
WO2022061689A1 PCT/CN2020/117626 CN2020117626W WO2022061689A1 WO 2022061689 A1 WO2022061689 A1 WO 2022061689A1 CN 2020117626 W CN2020117626 W CN 2020117626W WO 2022061689 A1 WO2022061689 A1 WO 2022061689A1
Authority
WO
WIPO (PCT)
Prior art keywords
combustible poison
rod
combustible
pellets
burnable poison
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.)
Ceased
Application number
PCT/CN2020/117626
Other languages
English (en)
Chinese (zh)
Inventor
厉井钢
徐非
马云帆
陈俊
曹建华
雷雨晴
温艳荣
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China General Nuclear Power Corp
China Nuclear Power Technology Research Institute Co Ltd
CGN Power Co Ltd
Original Assignee
China General Nuclear Power Corp
China Nuclear Power Technology Research Institute Co Ltd
CGN Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China General Nuclear Power Corp, China Nuclear Power Technology Research Institute Co Ltd, CGN Power Co Ltd filed Critical China General Nuclear Power Corp
Priority to PCT/CN2020/117626 priority Critical patent/WO2022061689A1/fr
Publication of WO2022061689A1 publication Critical patent/WO2022061689A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • G21C7/00—Control of nuclear reaction
    • G21C7/02—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect
    • G21C7/04—Control of nuclear reaction by using self-regulating properties of reactor materials, e.g. Doppler effect of burnable poisons
    • 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

Definitions

  • the invention relates to the technical field of nuclear fuel, in particular to a combustible poison rod and a fuel assembly containing the combustible poison rod.
  • the fuel rods in the core of the pressurized water reactor nuclear power plant are connected in a square array to form a fuel assembly, and the fuel rods are supported on the spacer grid assembly at certain distances along the length direction, so that each fuel rod maintains a certain value during its design life. Horizontal spacing.
  • the fuel rods consist of sintered cylindrical UO pellets housed in cladding tubes.
  • the residual reactivity of the core is relatively high at the beginning of the core life, and it is usually necessary to use combustible poisons to suppress the residual reactivity of the core, reduce the critical boron concentration, and flatten the power distribution of the core.
  • combustible poisons can be selected from materials such as gadolinium or erbium, which are doped in the nuclear fuel pellets in the form of oxides.
  • the combustible poison pellets containing oxides such as gadolinium or erbium are stacked one by one along the axial direction of the cladding tube to form a combustible poison rod.
  • the combustible poison content of all combustible poison pellets in the combustible poison rod is the same.
  • gadolinium and erbium have been widely used in pressurized water reactor nuclear power plants and achieved good results.
  • the nuclear fuel assemblies containing combustible poison rods are dispersed in the core according to the physical design, which helps to flatten the distribution of the neutron fluence rate in the core.
  • the axial power of the reactor core loaded with the nuclear fuel assemblies containing combustible poison rods is relatively high near the top or bottom at the end of the cycle, which is prone to form local power peaks (that is, often The so-called "saddle-shaped" power distribution), which easily leads to the axial instability of the power xenon oscillation in the late cycle.
  • the axial instability of the power xenon oscillation of the reactor core in the later period of the cycle is more serious, which has become one of the key factors restricting the operating flexibility of the reactor, and greatly affects the load tracking of the nuclear power plant. ability.
  • the technical problem to be solved by the present invention is to provide an improved combustible poison rod and a fuel assembly containing the combustible poison rod.
  • the technical solution adopted by the present invention to solve the technical problem is to provide a combustible poison rod comprising a cladding tube, a plurality of first combustible poison cores stacked in the cladding tube along the axial direction of the cladding tube block, a plurality of second combustible poison pellets stacked in the cladding tube along the axial direction of the cladding tube; a plurality of the first combustible poison pellets form a non-regulated area in the cladding tube , a plurality of the second combustible poison pellets form an adjustment area in the cladding tube;
  • the combustible poison content of each of the first combustible poison pellets is A%;
  • the content of the combustible poison of each of the second burnable poison pellets is B%;
  • a and B satisfy: 1 ⁇ B ⁇ A-1; or,
  • the combustible poison content of at least one of the second combustible poison pellets is C% and C% ⁇ A%, and the combustible poison content of the other second combustible poison pellets is B%;
  • A, B, and C satisfy: B ⁇ A, 1 ⁇ C ⁇ A-1.
  • the first combustible poison pellet is a solid cylinder or a hollow cylinder.
  • the second combustible poison pellets are solid cylinders or hollow cylinders.
  • the burnable poison in the first burnable poison pellet includes gadolinium and/or erbium.
  • the burnable poison in the second burnable poison pellet includes gadolinium and/or erbium.
  • the first combustible poison pellets are UO 2 -Gd 2 O 3 mixed oxide pellets or UO 2 -Er 2 O 3 mixed oxide pellets.
  • the second combustible poison pellets are UO 2 -Gd 2 O 3 mixed oxide pellets or UO 2 -Er 2 O 3 mixed oxide pellets.
  • the adjustment area is located at the lower end of the combustible poison rod
  • the length of the combustible poison rod is L
  • the length of the adjustment zone is H
  • the distance from the bottom of the combustible poison rod is S
  • L, H, and S satisfy:
  • the adjustment area is located at the upper end of the combustible poison rod
  • the length of the combustible poison rod is L
  • the length of the adjustment zone is H'
  • the distance from the top of the combustible poison rod is S'
  • L, H', S' satisfy:
  • the adjustment zones are distributed at the upper end and the lower end of the combustible poison rod at intervals;
  • the length of the combustible poison rod is L
  • the length of the adjustment area at the lower end is h and the distance from the bottom of the combustible poison rod is s
  • the length of the adjustment area at the upper end is h' and the distance from the The distance from the top of the combustible poison rod is s'
  • L, h, h', s and s' satisfy:
  • the present invention also provides a fuel assembly containing combustible poison rods, comprising at least one combustible poison rod described in any one of the above.
  • the fuel assembly further comprises several UO 2 fuel rods.
  • the fuel assembly further comprises at least one conventional combustible poison rod; the content of combustible poison in all combustible poison pellets of the conventional combustible poison rod is the same.
  • the combustible poison rod of the present invention contains two or more combustible poison pellets with different contents of combustible poisons in the axial direction, forming a regulated area and a non-regulated area, and significantly reducing the local axial power at the top or bottom of the core at the later stage of the reactor cycle, This further improves the "saddle-shaped" axial power distribution of the core at the end of the cycle and reduces the risk of axial instability of the power xenon oscillation.
  • the normal operating range of the nuclear power plant can be significantly increased, thereby improving the flexibility of the nuclear power plant operation; it can significantly prolong the load tracking time in the nuclear power plant cycle, thereby improving the nuclear power plant load tracking capability.
  • FIG. 1 is a schematic cross-sectional structure diagram of a combustible poison rod according to a first embodiment of the present invention
  • FIG. 2 is a schematic cross-sectional structure diagram of a combustible poison rod according to a second embodiment of the present invention
  • FIG. 3 is a schematic cross-sectional structure diagram of a combustible poison rod according to a third embodiment of the present invention.
  • FIG. 5 is a comparison diagram of the axial power peak distribution at the end of the cycle life between the fuel assembly of an embodiment of the present invention and the fuel assembly of the prior art.
  • the combustible poison rod of the present invention includes a cladding tube 10 , a plurality of first combustible poison pellets 11 and several The second combustible poison pellet 12 .
  • first combustible poison pellets 11 are stacked in the cladding tube to form a non-regulated area 1
  • second combustible poison pellets 12 are stacked in sequence in the cladding tube 10 to form an adjustment area 2 .
  • the combustible poison rod also includes an upper end plug 13 and a lower end plug 14 connected to the upper and lower ends of the cladding tube 10, respectively.
  • first combustible poison pellets 11 and the second combustible poison pellets 12 may be solid cylinders or hollow cylinders, respectively.
  • the combustible poison includes gadolinium and/or erbium. Therefore, the first combustible poison pellets 11 are UO 2 -Gd 2 O 3 mixed oxide pellets or UO 2 -Er 2 O 3 mixed oxide pellets, and the second combustible poison pellets 12 are UO 2 -Gd 2 O 3 Mixed oxide pellets or UO 2 -Er 2 O 3 mixed oxide pellets.
  • the combustible poison content of each first combustible poison pellet 11 is A%; in the regulation zone 2, the combustible poison content of each second combustible poison pellet 12 is B%.
  • A that is, the value A in A%) and B (that is, the value B in B%) satisfy: 1 ⁇ B ⁇ A-1.
  • the combustible poison content of each first combustible poison pellet 11 is A%; in the regulation area 2, the combustible poison of at least one second combustible poison pellet 12 The content is C% and C% ⁇ A%, and the combustible poison content of the remaining second combustible poison pellets 12 is B%.
  • A, B, and C that is, the value C in C%) satisfy: B ⁇ A, 1 ⁇ C ⁇ A-1.
  • the regulation area 2 is located at the lower end of the combustible poison rod, and other parts of the combustible poison rod including the upper end and the like are the non-adjustment area 1 .
  • the length of the combustible poison rod is L
  • the length of the adjustment zone 2 is H
  • the distance from the bottom of the combustible poison rod is S
  • L, H, and S satisfy: L/20 ⁇ S ⁇ L/8, L/20 ⁇ H+S ⁇ L/3.
  • the adjustment area 2 is located at the upper end of the combustible poison rod, and the other parts of the fuel poison rod including the lower end are the non-adjustment area 1 .
  • the length of the combustible poison rod is L
  • the length of the adjustment zone is H'
  • the distance from the top of the combustible poison rod is S'
  • L, H', S' satisfy: L/20 ⁇ S' ⁇ L/8, L/20 ⁇ S'+H' ⁇ L/3.
  • the regulation area 2 is distributed at the upper and lower ends of the combustible poison rod at intervals, and the other parts including the middle part of the combustible poison rod are the non-adjustment area 1 .
  • the length of the combustible poison rod is L
  • the length of the adjustment zone 2 at the lower end is h and the distance from the bottom of the combustible poison rod is s
  • the length of the adjustment zone 2 at the upper end is h' and the distance from the top of the combustible poison rod is s '
  • L, h, h', s and s' satisfy:
  • the combustible poison rod of the present invention is used in a fuel assembly. Therefore, the fuel assembly containing the combustible poison rod of the present invention includes at least one of the above-mentioned combustible poison rods, and also includes several UO 2 fuel rods.
  • the combustible poison rods can be arranged in numbers of four, eight, sixteen, etc.
  • the fuel assembly may also include at least one conventional combustible poison rod, and all the combustible poison pellets of the conventional combustible poison rod have the same content of combustible poison, and therefore do not have the regulated area and the non-regulated area of the combustible poison rod of the present invention .
  • the content of the combustible poison in all the combustible poison pellets of the conventional combustible poison rod may be the same (A%) as the combustible poison content of the first combustible poison pellet in the combustible poison rod of the present invention.
  • At least one may be the combustible poison rod of the present invention, and the rest may be conventional combustible poison rods, or all of them may be the combustible poison rods of the present invention.
  • the combustible poison rod of the invention contains two or more combustible poison pellets with different combustible poison contents in the axial direction, which improves the operation performance of the reactor core.
  • the U 235 in the combustible poison pellet can be tailings produced by uranium enrichment, natural uranium or slightly enriched uranium, and the enrichment degree of U 235 is smaller than that in the uranium pellet .
  • the U 235 enrichment in the first combustible poison pellet and the second combustible poison pellet is equal.
  • the reactor core fuel consists of 157 groups of 17 ⁇ 17 12-foot fuel assemblies, and each group of fuel assemblies consists of 264 fuel rods Composition, each fuel rod contains 272 fuel pellets.
  • the combustible poison rods of the present invention and the conventional combustible poison rods in the prior art were loaded into the core respectively, and the effects on the axial power distribution at the beginning and end of the cycle life were compared, as shown in Figures 4 and 5 (Fig.
  • FIG. 4 and 5 are the axial power distribution of the core when the conventional combustible poison rods of the prior art are used, and the dashed lines are the axial power distribution of the core when the combustible poison rods of the present invention are used). It can be seen from Fig. 4 and Fig. 5 that the combustible poison rod of the present invention can significantly improve the axial power distribution at the end of the cycle life without substantially changing the axial power distribution at the beginning of the life cycle, and reduce the power at the top and bottom of the core. Axial local power peak.
  • the combustible poison rod based on the present invention can significantly improve the axial power distribution at the later stage of the cycle life without substantially changing the axial power distribution at the beginning of the life cycle, reduce the risk of the axial instability of the xenon oscillation of the reactor power at the later stage of the cycle, and improve the nuclear power plant.
  • the capability of load tracking increases the flexibility of core operation.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • General Engineering & Computer Science (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Monitoring And Testing Of Nuclear Reactors (AREA)

Abstract

La présente invention concerne un crayon de poison consommable et un assemblage combustible contenant un crayon de poison consommable ; le crayon de poison consommable comprend un tube de gainage, et une pluralité de premiers blocs de noyau de poison consommable et de seconds blocs de noyau de poison consommable disposés dans le tube de gainage ; une pluralité de premiers blocs de noyau de poison consommable sont empilés dans le tube de gainage pour former une zone non conditionnée, et une pluralité de seconds blocs de noyau de poison consommable sont empilés dans le tube de gainage pour former une zone conditionnée ; le premier bloc de noyau de poison consommable a une teneur en poison consommable de A % ; le second bloc de noyau de poison consommable a une teneur en poison consommable de B % ; A et B satisfont l'expression 1 ≤ B ≤ A-1 ; ou au moins un second bloc de noyau de poison consommable a une teneur en poison consommable de C %, le second bloc de noyau de poison consommable restant a une teneur en poison de B % ; A, B et C satisfont les expressions B ≤ A, et 1 ≤ C ≤ A-1. Le crayon de poison consommable de la présente invention réduit de manière significative la puissance axiale locale en haut ou en bas du cœur du réacteur à la fin du cycle du réacteur, améliorant la distribution de puissance axiale dans la "forme de selle" du cœur plus tard dans le cycle, réduisant le risque d'instabilité axiale de la puissance due à l'oscillation xénon.
PCT/CN2020/117626 2020-09-25 2020-09-25 Crayon de poison consommable et assemblage combustible contenant un crayon de poison consommable Ceased WO2022061689A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/117626 WO2022061689A1 (fr) 2020-09-25 2020-09-25 Crayon de poison consommable et assemblage combustible contenant un crayon de poison consommable

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/117626 WO2022061689A1 (fr) 2020-09-25 2020-09-25 Crayon de poison consommable et assemblage combustible contenant un crayon de poison consommable

Publications (1)

Publication Number Publication Date
WO2022061689A1 true WO2022061689A1 (fr) 2022-03-31

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587090A (en) * 1982-11-05 1986-05-06 Hitachi, Ltd. Fuel assembly for boiling water reactor
JPH03267793A (ja) * 1990-03-15 1991-11-28 Toshiba Corp 燃料集合体
US5198186A (en) * 1989-05-10 1993-03-30 Kabushiki Kaisha Toshiba Fuel assembly for nuclear reactor
US5367547A (en) * 1992-06-22 1994-11-22 Kabushiki Kaisha Toshiba Fuel assembly for boiling water reactor and core
US20120140868A1 (en) * 2010-12-06 2012-06-07 Mitsubishi Heavy Industries, Ltd. Fuel rod and fuel assembly

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4587090A (en) * 1982-11-05 1986-05-06 Hitachi, Ltd. Fuel assembly for boiling water reactor
US5198186A (en) * 1989-05-10 1993-03-30 Kabushiki Kaisha Toshiba Fuel assembly for nuclear reactor
JPH03267793A (ja) * 1990-03-15 1991-11-28 Toshiba Corp 燃料集合体
US5367547A (en) * 1992-06-22 1994-11-22 Kabushiki Kaisha Toshiba Fuel assembly for boiling water reactor and core
US20120140868A1 (en) * 2010-12-06 2012-06-07 Mitsubishi Heavy Industries, Ltd. Fuel rod and fuel assembly

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