CN107093478A - A kind of pressurized water reactor core balanced recycle material-changing method of 24 months - Google Patents
A kind of pressurized water reactor core balanced recycle material-changing method of 24 months Download PDFInfo
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- CN107093478A CN107093478A CN201710201038.9A CN201710201038A CN107093478A CN 107093478 A CN107093478 A CN 107093478A CN 201710201038 A CN201710201038 A CN 201710201038A CN 107093478 A CN107093478 A CN 107093478A
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- reactor core
- fuel assembly
- changing method
- fuel
- months
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/20—Arrangements for introducing objects into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel
- G21C19/205—Interchanging of fuel elements in the core, i.e. fuel shuffling
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C19/00—Arrangements for treating, for handling, or for facilitating the handling of, fuel or other materials which are used within the reactor, e.g. within its pressure vessel
- G21C19/34—Apparatus or processes for dismantling nuclear fuel, e.g. before reprocessing ; Apparatus or processes for dismantling strings of spent fuel elements
-
- 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
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
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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 belongs to reactor design field, it is related to a kind of pressurized water reactor core balanced recycle material-changing method of 24 months.Described material-changing method is that most long fuel assembly of each 90 95 groups of burning times changed in the group fuel assembly of reactor core 170 180 is novel fuel assembly, and described novel fuel assembly is placed in the secondary outer ring of reactor core and the center position close to reactor core in refuelling component, and spent fuel component is placed in the other positions of reactor core, described replacing is carried out once for every 24 months.Using the material-changing method of the present invention, the cycle of pressurized water reactor core balanced recycle can be increased to 24 months by 18 months.
Description
Technical field
The invention belongs to reactor design field, it is related to a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method.
Background technology
In reactor core fuel management, on the basis of the security of reactor core is ensured, the utilization rate of raising nuclear fuel,
Extend the refulling cycle of reactor core, the phase in use longevity of nuclear power generating sets can be extended, shutdown number of times is reduced, so as to effectively drop
Low overhaul cost, improves nuclear power generating sets capability facfor, lifts the economy of nuclear power plant.
At present, what the reactor core being made up of 177 group fuel assemblies was used is all the fuel management strategy reloaded for 18 months.It is flat
68 group 4.45% of fuel assembly is changed in weighing apparatus circulation every time, is loaded using low leakage.Although such management strategy can make heap
Phase in the longevity length of core reaches 475EFPD, meets the requirement reloaded for 18 months, but there is the reality further extended in the reactor reloading pattern cycle
Demand.
The content of the invention
The purpose of the present invention be for nuclear plant safety design requirement there is provided a kind of pressurized water reactor core balanced recycle 24
The material-changing method of the moon, to extend the cycle of pressurized water reactor core balanced recycle.
In order to achieve this, in the embodiment on basis, the present invention provides a kind of pressurized water reactor core balanced recycle 24
The material-changing method of the moon, described material-changing method is each 90-95 group burning times changed in reactor core 170-180 group fuel assemblies
Most long fuel assembly is novel fuel assembly, and described novel fuel assembly is placed in into the secondary outer of reactor core in refuelling component
Circle and the center position close to reactor core, and spent fuel component are placed in the other positions of reactor core, it is described more
Change every 24 months and carry out once.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein described material-changing method carries out the replacing of described fuel assembly using low leakage loading pattern.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein described novel fuel assembly235U enrichments are 4.8-5.0%.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein replacing center gauge pipe with fuel rod in fuel assembly described in every group.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein the fuel assembly described in every group includes 250-280 roots fuel rod, 20-30 root guide pipes.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Detection instrument is placed in the guide pipe nearest from described fuel assembly center in method, wherein presurized water reactor heap.
In order to lift the nuclear fuel useful load of reactor core, the core loading reloaded for 24 months is reached, each fuel assembly takes
Disappeared fuel assembly center gauge pipe, is replaced using fuel rod, and the nuclear measurement instrument in heap is placed on from fuel stack
In the nearest guide pipe in part center, the nuclear fuel useful load of reactor core is improved.After this method, reactor core adds additional quite
In the nuclear fuel useful load of 0.67 former nuclear fuel assembly used.In the reactor core being made up of fuel assembly, control rod is arranged
Position will not arrange detection instrument in heap, vice versa.Therefore the position that guide pipe had both been inserted as control rod, is used as and puts again
The position of detection instrument is put, therefore cancelling gauge pipe will not cause fuel assembly unavailable.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein the novel fuel assembly described in every group includes fuel rod of the 4-24 roots containing gadolinium.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein the Gd containing percentage by weight 2-10% in the fuel rod containing gadolinium2O3。
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein in the fuel rod containing gadolinium235U enrichments are the 0.5-0.9 of fuel rod of the surrounding without gadolinium.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein in refuelling component, the novel fuel assembly for loading more gadolinium-containing fuel rods to be disposed adjacent to the centre bit of reactor core
Place is put, the novel fuel assembly for loading less gadolinium-containing fuel rod is disposed adjacent to the position of reactor core outer ring, the secondary outer ring position of reactor core
All arrange novel fuel assembly.
The balanced recycle reactor core reloaded for 24 months, the built-in reactivity at the beginning of core life is very big, and power peak factor is also higher.
Gadolinium-containing fuel rod is arranged in the higher position in core power peak, on the one hand for controlling the built-in reactivity of beginning of life, reduces heap
Core boron concentration, prevents that, because too high boron concentration causes positive temperature feedback, power peak factor on the other hand can be flattened.Every group new
Fuel assembly is all novel fuel assembly containing gadolinium, and the number of gadolinium-containing fuel rod can be 4,8,12,16,20,24.Pellet containing gadolinia fuel
Middle Gd2O3Percentage by weight be 2%-10%,235U enrichment is lower than the enrichment of surrounding not gadolinium-containing fuel rod, and it is enriched with
Spend for the 0.5-0.9 of surrounding fuel enrichment.
In a preferred embodiment, the present invention provides a kind of pressurized water reactor core balanced recycle side of reloading of 24 months
Method, wherein the sum of described fuel assembly is 177 groups, it is new that wherein 92 groups burning times most long fuel assembly is changed every time
Fuel assembly.
The beneficial effects of the present invention are using the material-changing method of the present invention, by increasing novel fuel assembly number, lifting235U enrichments, addition reactor core nuclear fuel useful load, and component containing gadolinia fuel is used, can be by pressurized water reactor core balanced recycle
Cycle was increased to 24 months by 18 months, so as to realize that phase in longevity length is that the balanced recycle of 24 months reloads loading.
Wherein, in novel fuel assembly, the gauge pipe in fuel assembly is replaced using fuel rod, the combustion of heap core is effectively increased
The useful load of material；The reprinting pattern of low leakage is taken, the fuel assembly by irradiation is placed on reactor core outmost turns, gadolinium will be contained
The less fuel assembly of fuel rod is arranged in reactor core time outer ring, and the more novel fuel assembly of other gadolinium-containing fuel rods is placed on reactor core
Near center location；By using component containing gadolinia fuel, the control of reactor core reactivity is realized, boron concentration is reduced, it is therefore prevented that
There is temperature positive feedback in reactor core, and power peak factor is reduced again, realizes the effect of power flattening.By the above method, obtain
The balanced recycles of 177 group fuel assembly reactor cores load, phase in longevity length reaches 646EFPD.
Brief description of the drawings
Fig. 1 is fuel rod, the fuel containing gadolinium without gadolinium in new fuel assembly in exemplary material-changing method of the invention
The distribution map of rod, guide pipe, wherein the internal square for indicating numeral 1 represents the fuel rod without gadolinium, inside indicates the side of numeral 2
Block represents the fuel rod (amounting to 8) containing gadolinium, and the square that inside indicates numeral 3 represents guide pipe.
Fig. 2 is exemplary material-changing method of the invention in the distribution map of after-combustion component that reloads, wherein black bars generation
Table burnt (irradiation) cross fuel assembly, white square represent in new fuel assembly, square numeral represent contain gadolinia fuel
The radical of rod.
Embodiment
The embodiment of the present invention is further illustrated below in conjunction with accompanying drawing.
In the exemplary pressurized water reactor core balanced recycle material-changing method of 24 months of the invention, pressurized water reactor core is constituted
Fuel assembly includes 177 groups altogether.Wherein 92 groups burning times most long fuel assembly is changed using low leakage loading pattern every time
For novel fuel assembly (wherein235U enrichments are 4.95%, more conventional to increase) so that reactor core balanced recycle
Length of the cycle reaches length of reloading for 24 months.
The reactor fuel active section of 177 group fuel assemblies is highly 365.76cm, and equivalent diameter is 322.8cm, ratio of height to diameter
For 1.13.The fuel rod of each fuel assembly is arranged by 17 × 17 square formations, (includes the combustion without gadolinium again comprising 265 fuel rods
Charge bar and the fuel rod containing gadolinium), 24 guide pipes.Fuel rod, the fuel containing gadolinium of gadolinium are free of in exemplary new fuel assembly
Rod, guide pipe distribution it is as shown in Figure 1.
Fuel assembly eliminates the position of center gauge pipe, instead rod, and detection instrument is placed on from combustion in heap
Expect in the nearest guide pipe in component center.In 177 group fuel assemblies composition reactor core, heap will not be arranged by arranging the position of control rod
Interior detection instrument, vice versa.Therefore the position that guide pipe had both been inserted as control rod, the position for detecting instrument as placing again
Put, therefore cancelling gauge pipe will not cause fuel assembly unavailable.
Gd in the gadolinium-containing fuel rod of novel fuel assembly2O3The percentage by weight of (being burnable poison) is 8%,235U enrichments are
4.95%；Around not gadolinium-containing fuel rod35U enrichments are 3.0% (being the 61% of gadolinium-containing fuel rod).It can contain in novel fuel assembly
Have 4,8,12,16,20 or 24 gadolinium-containing fuel rods, bring larger flexibility to design.Specifically, balanced recycle reactor core
Novel fuel assembly is divided into five types according to the quantity of gadolinium-containing fuel rod：Containing 8, the new combustion of 12,16,20,24 gadolinium-containing fuel rods
Expect component.
In refuelling component, the fuel assembly of (irradiation) excessively that will burn is placed on reactor core outmost turns, will contain gadolinium
The less novel fuel assembly of fuel rod is arranged in reactor core time outer ring, and the more novel fuel assembly of other gadolinium-containing fuel rods is placed
In reactor core near center location.
Exemplary material-changing method of the invention is as shown in Figure 2 in the distribution for the after-combustion component that reloads.In Fig. 2 abscissa from
The right side is turned left to be arranged by A to R successively, and ordinate is from top to bottom successively by 1 to 15 arrangement, in balanced recycle reactor core, secondary outer ring position
Put, i.e.,：B05、B06、B07、B08、B09、B10、B11、C04、C12、D03、D12、E02、E14、F02、F03、F13、F14、
G02、G14、H02、H14、J02、J14、K02、K14、L02、L14、M03、M13、N04、N12、P05、P06、P07、P08、P09、
P10, P11, which are disposed with, includes the novel fuel assembly of 8 or 16 gadolinium-containing fuel rods, close to reactor core center F07,
F09, G06, G08, G10, H07, H09, J06, J08, J10, K07, K09 are disposed with the fresh fuel group including 24 gadolinium-containing fuel rods
Part.
Core loading optimization design arrangement is on the premise of basic security criterion, to have considered fuel management performance ginseng
What number and neutronics parameter were drawn.The fuel management result of calculation of balanced recycle is as shown in table 1 below, the neutronics ginseng of balanced recycle
Number result of calculation is as shown in table 2 below.
The fuel management result of calculation of the balanced recycle of table 1
The neutronics parameter result of calculation of the balanced recycle of table 2
Core loading scheme in above balanced recycle meets basic design parameters：Fdh≤1.65；FQ≤ 2.45 and basic
Safety criterion, wherein FdhFor enthalpy rise factor, FQFor hot spot factor.Balanced recycle heap can be drawn from the result of calculation of Tables 1 and 2
The design that core is loaded fully meets safety criterion.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations to the present invention belong to the model of the claims in the present invention and its equivalent technology
Within enclosing, then the present invention is also intended to comprising including these changes and modification.Above-described embodiment or embodiment are simply to the present invention
For example, the present invention can also be implemented with other ad hoc fashions or other particular form, without departing from the present invention's
Main idea or substantive characteristics.Therefore, it is regarded as from the point of view of the embodiment of description is in terms of any illustrative and non-limiting.This
The scope of invention should be illustrated that any change equivalent with the intention and scope of claim should also be included by appended claims
Within the scope of the invention.
Claims (10)
1. a kind of pressurized water reactor core balanced recycle material-changing method of 24 months, it is characterised in that：Described material-changing method is each
The 90-95 group burning times most long fuel assembly changed in reactor core 170-180 group fuel assemblies is novel fuel assembly, and more
Described novel fuel assembly is placed in the secondary outer ring of reactor core and the center position close to reactor core during fuel assembly reload, and by
Spent fuel component is placed in the other positions of reactor core, and described replacing is carried out once for every 24 months.
2. material-changing method according to claim 1, it is characterised in that：Described material-changing method uses low leakage loading pattern
Carry out the replacing of described fuel assembly.
3. material-changing method according to claim 1, it is characterised in that：Described novel fuel assembly235U enrichments are
4.8-5.0%.
4. material-changing method according to claim 1, it is characterised in that：Replaced in fuel assembly described in every group with fuel rod
Center gauge pipe.
5. material-changing method according to claim 1, it is characterised in that：Fuel assembly described in every group includes 250-280 roots
Fuel rod, 20-30 root guide pipes.
6. material-changing method according to claim 5, it is characterised in that：Detection instrument is placed on from described in presurized water reactor heap
In the nearest guide pipe in fuel assembly center.
7. material-changing method according to claim 5, it is characterised in that：Novel fuel assembly described in every group includes 4-24 roots
Fuel rod containing gadolinium.
8. material-changing method according to claim 7, it is characterised in that：Contain weight percent in the described fuel rod containing gadolinium
Gd than 2-10%2O3。
9. material-changing method according to claim 7, it is characterised in that：In the described fuel rod containing gadolinium235U enrichments are
The 0.5-0.9 of fuel rod of the surrounding without gadolinium.
10. material-changing method according to claim 7, it is characterised in that：In refuelling component, it will load more containing gadolinium
The novel fuel assembly of fuel rod is disposed adjacent to the center position of reactor core, and the novel fuel assembly for loading less gadolinium-containing fuel rod is put
In the position close to reactor core outer ring, novel fuel assembly is all arranged in the secondary outer ring position of reactor core.
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Cited By (5)
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| CN107910077A (en) * | 2017-10-19 | 2018-04-13 | 中国核电工程有限公司 | A kind of core loading method of the alternate balanced recycle of VVER heap-type length |
| CN114220560A (en) * | 2021-12-13 | 2022-03-22 | 中国核动力研究设计院 | Boron-controlled peak regulation method and system for pressurized water reactor nuclear power plant |
| CN114242283A (en) * | 2021-12-22 | 2022-03-25 | 中国核动力研究设计院 | Fuel loading method for 24-month refueling period of pressurized water reactor core |
| CN114267464A (en) * | 2021-12-22 | 2022-04-01 | 中国核动力研究设计院 | Pressurized water reactor core refueling long-period fuel management method and application |
| CN115376712A (en) * | 2022-08-03 | 2022-11-22 | 上海核工程研究设计院有限公司 | Fuel management method and reactor core of long-period balanced cycle of passive nuclear power plant |
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| CN114220560B (en) * | 2021-12-13 | 2024-05-07 | 中国核动力研究设计院 | Boron control peak regulation method and system for pressurized water reactor nuclear power plant |
| CN114242283A (en) * | 2021-12-22 | 2022-03-25 | 中国核动力研究设计院 | Fuel loading method for 24-month refueling period of pressurized water reactor core |
| CN114267464A (en) * | 2021-12-22 | 2022-04-01 | 中国核动力研究设计院 | Pressurized water reactor core refueling long-period fuel management method and application |
| CN115376712A (en) * | 2022-08-03 | 2022-11-22 | 上海核工程研究设计院有限公司 | Fuel management method and reactor core of long-period balanced cycle of passive nuclear power plant |
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