CN113257441A - Burnable poison and small plate-shaped pressurized water reactor - Google Patents
Burnable poison and small plate-shaped pressurized water reactor Download PDFInfo
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- CN113257441A CN113257441A CN202110510821.XA CN202110510821A CN113257441A CN 113257441 A CN113257441 A CN 113257441A CN 202110510821 A CN202110510821 A CN 202110510821A CN 113257441 A CN113257441 A CN 113257441A
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- 239000002574 poison Substances 0.000 title claims abstract description 118
- 231100000614 poison Toxicity 0.000 title claims abstract description 118
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 36
- 239000003758 nuclear fuel Substances 0.000 claims abstract description 25
- 239000000126 substance Substances 0.000 claims abstract description 23
- 229910052768 actinide Inorganic materials 0.000 claims abstract description 12
- 150000001255 actinides Chemical class 0.000 claims abstract description 12
- 229910052796 boron Inorganic materials 0.000 claims description 15
- 239000006185 dispersion Substances 0.000 claims description 5
- 229910052739 hydrogen Inorganic materials 0.000 claims description 5
- 238000005253 cladding Methods 0.000 claims description 4
- 239000002826 coolant Substances 0.000 claims description 3
- 230000009257 reactivity Effects 0.000 abstract description 58
- 239000000446 fuel Substances 0.000 abstract description 23
- 238000010521 absorption reaction Methods 0.000 description 17
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 12
- 229920000642 polymer Polymers 0.000 description 7
- 238000000034 method Methods 0.000 description 6
- 229910052767 actinium Inorganic materials 0.000 description 5
- QQINRWTZWGJFDB-UHFFFAOYSA-N actinium atom Chemical compound [Ac] QQINRWTZWGJFDB-UHFFFAOYSA-N 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- VQCBHWLJZDBHOS-UHFFFAOYSA-N erbium(III) oxide Inorganic materials O=[Er]O[Er]=O VQCBHWLJZDBHOS-UHFFFAOYSA-N 0.000 description 5
- 230000004992 fission Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 230000002035 prolonged effect Effects 0.000 description 5
- 229910052688 Gadolinium Inorganic materials 0.000 description 4
- UIWYJDYFSGRHKR-UHFFFAOYSA-N gadolinium atom Chemical compound [Gd] UIWYJDYFSGRHKR-UHFFFAOYSA-N 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- CMIHHWBVHJVIGI-UHFFFAOYSA-N gadolinium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Gd+3].[Gd+3] CMIHHWBVHJVIGI-UHFFFAOYSA-N 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000155 isotopic effect Effects 0.000 description 2
- 241000894007 species Species 0.000 description 2
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 241000276425 Xiphophorus maculatus Species 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000035755 proliferation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 231100000167 toxic agent Toxicity 0.000 description 1
- 239000003440 toxic substance Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
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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
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
- G21C3/62—Ceramic fuel
- G21C3/623—Oxide fuels
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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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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Plasma & Fusion (AREA)
- General Engineering & Computer Science (AREA)
- High Energy & Nuclear Physics (AREA)
- Monitoring And Testing Of Nuclear Reactors (AREA)
Abstract
本发明提供了一种可燃毒物，包括富集同位素167Er类物质和锕系核素231Pa类物质中的一种和PACS‑J。本申请还提供了一种小型板状压水堆，包括核燃料和可燃毒物；所述核燃料为弥散型UO2，所述可燃毒物包括富集同位素167Er类物质和锕系核素231Pa类物质中的一种和PACS‑J。本申请以167Er、231Pa中的一种和PACS‑J匹配作为可燃毒物，本发明提出上述新型可燃毒物的组合，给出针对具体板状元件压水堆堆芯的组合匹配，使板状元件压水堆堆芯获得更长的堆芯寿期，提高了燃料利用率，同时显著降低了堆芯在燃耗过程中的剩余反应性波动。The invention provides a combustible poison, including one of enriched isotope 167 Er-type substances and actinide nuclide 231 Pa-type substances and PACS-J. The application also provides a small plate-shaped pressurized water reactor, including nuclear fuel and combustible poison; the nuclear fuel is dispersive UO 2 , and the combustible poison includes enriched isotope 167 Er species and actinide nuclide 231 Pa species One of the and PACS‑J. In the present application, one of 167 Er and 231 Pa is matched with PACS-J as the combustible poison. The present invention proposes the combination of the above-mentioned novel combustible poison, and provides the combination matching for the core of the pressurized water reactor of the specific plate element, so that the plate element The PWR core achieves a longer core life, improves fuel utilization, and significantly reduces the residual reactivity fluctuation of the core during burnup.
Description
Technical Field
The invention relates to the technical field of nuclear reactors, in particular to a burnable poison and a small plate-shaped pressurized water reactor.
Background
Burnable poisons by themselves have greater flexibility, which makes them play a more important role in core design. At present, when nuclides such as boron, gadolinium and the like are generally adopted by commercial pressurized water reactors as burnable poisons, the core life cannot exceed that of the reactor without the burnable poisons, and along with the development of reactors, the core life as long as possible is required under the condition of ensuring controllable reactivity, so that better economy is realized.
Part of the small reactors extend the core life by using higher fuel enrichment (60% to 97%). However, the small reactor needs to be controlled to have larger initial residual reactivity due to high fuel enrichment, and if the larger residual reactivity is inhibited by continuously adopting the traditional burnable poison of the pressurized water reactor, the situations that the larger residual reactivity cannot be inhibited at the beginning of the service life, the reactivity is greatly fluctuated in the service life, and the larger reactivity punishment is caused at the end of the service life may occur. On the other hand, the nuclides currently used as burnable poisons are mainly gadolinium, boron and the like, and these nuclides have a large neutron absorption cross section and can absorb neutrons to control the reactivity of the core, but daughter nuclides generated after the neutrons are absorbed cannot play any role in the reactor, and the life of the core cannot be prolonged. Thus, it has not been found that the selected conventional burnable poison materials are suitable for cores with higher fuel enrichment and that the properties of the burnable poison itself are used at the end of the life to achieve an extended core life.
Disclosure of Invention
The invention aims to provide a burnable poison and a small plate-shaped pressurized water reactor, wherein the burnable poison can inhibit residual reactivity at the beginning of a service life and can prolong the service life of a core at the end of the service life.
In view of the above, the present application provides a burnable poison comprising an enriched isotope167Er substance and actinium nuclide231One of Pa class substances and PACS-J.
Preferably, the enriched isotope167The Er substance is167Er2O3。
Preferably, the actinide nuclide231The Pa substance is231Pa2O3。
The application also provides a small plate-shaped pressurized water reactor, which comprises nuclear fuel and burnable poison; the nuclear fuel is a dispersive UO2Said burnable poison comprising an enriched isotope167Er substance and actinium nuclide231One of Pa substances and PACS-J, and the loading form of the burnable poison is dispersion type.
Preferably, the enrichment degree of the nuclear fuel is 60-97%.
Preferably, the enrichment degree of the nuclear fuel is 60-70%.
Preferably, the cladding of the nuclear fuel is Zr-4.
Preferably, the moderator of the nuclear fuel is light water, and the coolant is light water.
Preferably, the enrichment degree of the nuclear fuel is 60-70%, and the PACS-J are167In the combination of Er: containing PACS-J and167the number of the burnable poison plates of the Er is 1 and 4-8 respectively;
PACS-J and231pa in combination: containing PACS-J and231the number of the burnable poison plates Pa is 1 and 10-12 respectively;
PACS-J in a single burnable poison plate,231Pa and167the content of Er is 70.0 wt% -89.2 wt%, 2.27 wt% -6.83 wt% and 4.5 wt% -9.3 wt% respectively.
Preferably, the elements of PACS-J comprise: C. h, B, O, Si, the atomic numbers of each element are respectively: 14. 34, 10, 2, 4.
The present application provides a burnable poison comprising: enriched isotopes167Er substance and actinium nuclide231One of Pa class substances and PACS-J. Enrichment is used in this application167When Er is used as a burnable poison, compared with a natural oxide, the generation of nuclides with small absorption cross sections in the middle of a burnup chain is reduced, and the nuclide residues of filial generations at the end of the core life are reduced; by using231When Pa is used as the combustible toxic substance,231pa burnup chain in which fissile nuclides are directly present233U and fissionable nuclides232U，231Pa post-capture neutron generation232Pa，232Pa has a half-life of only 1.3d, decay to form232U，232The fission cross-section and the trapping cross-section of the U are very similar, so that232U can capture neutronsGeneration of fissile nuclides233U, can also complement reactivity by fission directly; when the PACS-J is used as a burnable poison, the advanced polymer has higher hydrogen content and high boron content, and has higher hydrogen content, so that the advanced polymer has a slowing effect when being used as the burnable poison, the generation and utilization of thermal neutrons are increased, the utilization value of the thermal neutrons is improved, and the consumption of fission nuclide Pu is promoted. Thus choose to167Er、231Pa and PACS-J are used as burnable poison, so that the core life can be prolonged, and the fuel utilization rate can be improved; the PACS-J has high boron content, so that the reactivity in the life is faster release rate.
On the other hand, for the high-enrichment fuel reactor core, the reactor core has larger initial residual reactivity, and burnable poisons of a large neutron absorption section and a small neutron absorption section are reasonably matched in the assembly, so that a better reactive burnup curve can be obtained.
Drawings
FIG. 1 is a schematic diagram of a small plate-shaped pressurized water reactor burnable poison and an application thereof provided by the application;
FIG. 2 is a schematic view of a plate fuel assembly according to an embodiment provided herein;
FIG. 3 is a schematic diagram of the chemical structure of the advanced polymer provided herein;
FIG. 4 is a schematic illustration of burnup depth for an assembly provided herein containing different isotopic species enriched for burnable poison;
FIG. 5 is a schematic view of burnup depth for an assembly provided herein containing different actinides as burnable poisons;
FIG. 6 is a schematic illustration of the burnup depth of an assembly of PACS-J and PACS-L provided herein as burnable poisons;
FIG. 7 is a schematic illustration of core burnup depths for different burnable poison combinations provided herein;
FIG. 8 is a schematic view of the burnup depth of the assembly of different burnable poisons preferred in the present application.
Detailed Description
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The embodiment of the invention discloses a burnable poison which comprises an enriched isotope167Er substance and actinium nuclide231One of Pa class substances and PACS-J.
In the present application, the enriched isotope167Er species are selected from167Er2O3(ii) a Said actinide nuclide231The Pa substance is231Pa2O3(ii) a The chemical structural formula of the PACS is specifically shown in figure 3. The above-mentioned enriched isotopes of the present application167Er substance and actinide nuclide231The source of the Pa-type substance and the PACS-J is not particularly limited, and may be a commercially available product or a product prepared by a method known to those skilled in the art.
On the basis of the burnable poison, the application also provides a small plate-shaped pressurized water reactor which comprises nuclear fuel and the burnable poison, wherein the nuclear fuel is dispersed UO2Said burnable poison comprising an enriched isotope167Er substance and actinium nuclide231One of Pa substances and PACS-J, and the loading form of the burnable poison is dispersion type. The burnable poison is dispersed in the nuclear fuel.
Fig. 1 is a schematic diagram of a burnable poison of a small plate-shaped pressurized water reactor and an application thereof, in which a fuel element of the plate-shaped pressurized water reactor has a small thickness, and since a heat transfer area per unit volume of the core is increased, the core power density can be increased to reduce the core volume under the condition of the same power, and thus, a reactor using the plate-shaped fuel element has a high core average power density and a low fuel core temperature. UO2The dispersion type fuel has the advantages of good irradiation stability, good heat-conducting property, strong corrosion resistance, long service life, high fuel consumption and the like, and is suitable for a miniaturized reactor with a long reactor core life.
Traditional pressurized water reactors take the form of a combination of three reactivity control methods: control rod, burnable poison and solubleA neutron absorber. For small plate pressurized water reactors, in order to eliminate the disadvantages associated with boron, boron-free operation is therefore used. Excessive reliance on control rods increases the complexity of the reactor control system and burnable poisons play a crucial role in small reactor designs. The small plate-shaped pressurized water reactor has larger initial residual reactivity at the beginning of the service life, so higher requirements on burnable poison are put forward. Boron and gadolinium, which are conventional burnable poisons, are compared167Er and231pa has a larger neutron absorption cross section. In a reactor core with larger initial residual reactivity, the reactivity control is carried out by adopting traditional burnable poison such as boron, gadolinium and the like, and the reactivity is released quickly, so that the residual reactivity in the middle period of the service life is greatly fluctuated. Therefore, for a core with a large initial residual reactivity, a burnable poison material with a small absorption cross section is used to control the release rate of reactivity, and231existence of fissile nuclides in Pa burnup chain233U, at the end of life, can fission to complement reactivity and prolong the core life. Using enrichment isotopes167Er is used as a burnable poison, so that the generation of intermediate nuclide is reduced, and the offspring residue is reduced at the end of the service life. The PACS-J has high hydrogen content, so that the PACS-J has self-moderation characteristic, can improve the utilization rate of thermal neutrons at the end of the service life, promotes the consumption of fissile nuclide Pu, and prolongs the core life.
However, because PACS-J has a high boron content, the reactivity life of the component fluctuates greatly when PACS-J is added into the component as a single burnable poison. PACS-J compared to167Er and231pa has a larger neutron absorption cross section and there is difficulty in controlling reactivity in a core having a large initial residual reactivity. Therefore PACS-J added to the module as a single burnable poison did not achieve the desired reactive burn-up profile. Therefore, the PACS-J is matched with the burnable poison with a small neutron absorption cross section, so that the problem of large reactivity fluctuation can be solved, and a better reactivity burnup curve can be obtained.
The application provides a small plate-shaped pressurized water reactor, which comprises a dispersion type UO2As a plate-shaped pressurized water reactor nuclear fuel to167Er and231one of Pa and PACS-J are combined to be used as burnable poison, the reactivity of the reactor core is controlled by utilizing the self characteristics, and isotopes are enriched167Er reduces the generation of intermediate nuclides of burnup chains, reduces the residue of offspring nuclides at the end of the life,231pa can be converted to fissile nuclides, supplementing core reactivity at the end of life. The PACS-J can improve the utilization efficiency of thermal neutrons at the end of the life by utilizing the self-slowing characteristic, and prolong the life of the core; different preferred burnable poisons are reasonably matched, so that a better reactive burnup curve can be obtained. Therefore, the method can obtain a better reactive burnup curve, prolong the core life at the end of the life and improve the fuel utilization rate.
In the application, the enrichment degree of the nuclear fuel is 60-97%, and more specifically, the enrichment degree of the nuclear fuel is 60-70%; the cladding of the nuclear fuel is Zr-4; the moderator of the nuclear fuel is light water, and the coolant is light water. The source of the above-mentioned raw materials is not particularly limited in this application. For the small plate-shaped pressurized water reactor provided by the application, the enrichment degree of the nuclear fuel is 60-70%, PACS-J and167in the combination of Er: containing PACS-J and167the number of the burnable poison plates of the Er is 1 and 4-8 respectively; PACS-J and231pa in combination: containing PACS-J and231the number of the burnable poison plates Pa is 1 and 10-12 respectively; PACS-J in a single burnable poison plate,231Pa and167the content of Er is 70.0 wt% -89.2 wt%, 2.27 wt% -6.83 wt% and 4.5 wt% -9.3 wt% respectively. The burnable poison provided by the application is enriched with isotope167Er absorbs neutrons to control reactor core reactivity, the reactivity is slowly released in the middle of the life of the reactor core, products which absorb neutrons are few in residue at the tail end of the life, and the reactivity punishment is small; actinide isotopes231Pa can inhibit excessive residual reactivity of the reactor core in the initial stage of the service life by absorbing neutrons, and can gradually convert the reactor core into fissile nuclides by absorbing neutrons233U, to achieve a gradual release of reactivity over the life and by additional conversion to233U prolongs the core life; the advanced polymer is a boron-containing high-hydrogen compoundThe boron-containing fuel is a good burnable poison material, can inhibit excessive residual reactivity of a reactor core in the initial period of the life of the reactor core, has a very simple burnup chain of boron, and is almost transparent to neutrons after absorbing neutrons; meanwhile, PACS-J also has good neutron moderating capacity, so that the resonance absorption of local harmful neutrons in the reactor core can be reduced, the probability that neutrons are generated by fission and finally moderated into thermal neutrons is improved, the utilization rate of the thermal neutrons in the reactor core is improved on the whole, and the service life of the reactor core is prolonged.
The present invention is directed to167Er、231The characteristics of Pa and PACS-J in neutron absorption performance, the middle-school characteristics of products after neutron absorption and the influence on the moderation capacity of local neutrons are provided through optimized design167Er、231The invention discloses a novel burnable poison applied by combining Pa and PACS-J, which is innovated in providing the novel burnable poison and provides combination matching aiming at a concrete platy element pressurized water reactor core, and the obtained beneficial effects are as follows: the core of the plate-shaped element pressurized water reactor has longer core life, the fuel utilization rate is improved, and the residual reactivity fluctuation of the core in the burnup process is obviously reduced.
For further understanding of the present invention, the burnable poison and the compact pressurized water reactor provided by the present invention will be described in detail with reference to the following examples, and the scope of the present invention is not limited by the following examples.
Examples
The method comprises the steps of adopting dispersed burnable poison (the burnable poison is uniformly mixed with fuel), and carrying out transport-burnup calculation on different burnable poisons in an assembly by using a DRAGON program, wherein the schematic diagram of the assembly is shown in figure 2, a moderator 3, fuel 2 and a cladding 1 are respectively arranged from inside to outside, and the enrichment degree of the fuel is 60%.
Respectively carrying out transport-burnup calculation on different enriched isotopes, actinides and advanced polymers, and calculating the service life of the component without burnable poison for comparison; FIG. 4 shows the results of the combustion calculations for oxides with different enriched isotopes, and FIG. 4 shows that the use of oxides with enriched isotopes157Gd2O3And167Er2O3as a component of a burnable poison,the number of full power days of operation (EFPD) that can be reached at the end of life almost coincides with a burningless poison component; containing burnable poison167Er2O3The component (a) controls the release of reactivity over a lifetime, the reactivity fluctuations being less than those of the burnable poison157Gd2O3And exceeds the component containing burnable poison157Gd2O3EFPD of components, thus isotopic enrichment167Er2O3When used as a burnable poison, the reactivity penalty at the end of life can be reduced, and the EFPD is almost consistent with a burnerless poison component.
FIG. 5 shows the results of burnup calculations for oxides of different actinides, and FIG. 5 shows that burnable poison-containing compounds are used231Pa2O3The proliferation is achieved at the end of the life and EFPD exceeds that of the burningless poison component. Thus, it is possible to provide231Pa2O3When the product is used as a combustible poison, the reaction is controlled to be slowly released in the life span, the EFPD is prolonged at the end of the life span, and the fuel utilization rate is improved.
FIG. 3 is a schematic diagram of the structure of advanced polymer, and two currently preferred advanced polymers PACS-J and PACS-L are used for analysis and calculation in the invention. FIG. 6 is a graph of the results of burnup calculations for PACS-J and PACS-L, wherein a single burnable poison-containing fuel plate has a PACS-L content greater than PACS-J; because each element of PACS-L comprises: C. h, B, O, Si, wherein the atomic numbers of each element are respectively: 44. 84, 10, 5, 12, B has a mass fraction of only 9% in PACS-L and 24% in PACS-J, FIG. 6 shows that in a core with a greater initial residual reactivity, when PACS-L is used as a burnable poison, the residual reactivity is suppressed even if more PACS-L is added at the beginning of the life (increasing the self-shielding effect of PACS-L, slowing the consumption rate of PACS-L), so that kinf1.04, but the reactivity control in the service life still has difficulty, and the safe operation criterion of the reactor is not satisfied. Assemblies containing the burnable poison PACS-J, by adding PACS-J at the beginning of life, such that kinf1.11, the reactivity fluctuates along with the aging in the service life, but the reactivity fluctuation is less than 0.2, and the utilization rate of thermal neutrons is improved, the service life is prolonged, and the fuel is improved through the self-slowing characteristic of the reactor at the end of the service lifeAnd (4) material utilization rate.
The burnup curve for the novel burnable poison is shown in FIG. 7. In the above embodiment of a small plate-shaped pressurized water reactor burnable poison and its application, the burnable poison is preferably selected167Er、231Pa and PACS-J were analyzed as burnable poisons, i.e., different burnable poisons were added to different fuel plates in one assembly, thereby obtaining a more optimal reactive burnup curve. When the preferred PACS-J is used as a burnable poison, the burnup is faster when the PACS-J is independently used as the burnable poison due to the higher boron content of the PACS-J, so that the reactivity is released faster in the service life of the burnable poison, namely the control of the reactivity is difficult; preferred over PACS-J167Er and231pa has a smaller neutron absorption section, and is slower in burnup when being independently used as a burnable poison, so that the reactivity can be well controlled by slowly releasing the reactivity in the service life of the burnable poison, but the burnup is slower, so that the burnable poison at the end of the service life cannot be fully consumed. Therefore, PACS-J is reasonably matched with two small neutron absorption cross sections for fast burnup and slow burnup burnable poison in the assembly respectively, so that the initial residual reactivity can be inhibited more at the beginning of the life, the reactivity can be released slowly in the life, and the core life can be longer at the end of the life.
FIG. 8 shows PACS-J with167Er and231pa combined core burnup curve, wherein PACS-J and167in the combination of Er: containing PACS-J and167the quantity of the burnable poison plates of Er is 1 and 4 respectively, and the burnable poison content in a single burnable poison plate is 70 wt% and 4.5 wt% respectively. PACS-J and231pa in combination: containing PACS-J and231the quantity of the burnable poison plates Pa is 1 and 10 respectively, and the burnable poison content in a single burnable poison plate is 70 wt% and 2.27 wt%, respectively. And the arrangement of the burnable poison plates adopts symmetrical arrangement. As can be seen in FIG. 8, the initial k of the core is obtained by combining the burnable poison with the large neutron absorption cross section and the burnable poison with the small neutron absorption cross sectioninf1.10, no large reactivity fluctuation in the service life, the core life exceeds that of a core without burnable poison, the fuel utilization rate is improved, and better reactivity control is realized(ii) a More specifically, at the beginning of the life, more initial residual reactivity, i.e., the change of the kinf from 1.20 to 1.10, at the end of the life, the change of the kinf with the burn-up/EFPD curve is smooth, the reactivity is released smoothly without large fluctuation, at the end of the life, the combined curve is adopted, the burn-up/EFPD which can be achieved at the end of the life is larger, and the longer core life can be realized after the combination. In summary, the following steps: after the burnable poison combination, more initial residual reactivity can be inhibited at the beginning of the life, the mild release of reactivity can be realized in the life, and the longer core life can be realized at the end of the life.
In summary, the present application obtains three preferred burnable poisons by performing burnable poison typing for different types of nuclides: PACS-J, 167Er, 231 Pa; the PACS-J has a large neutron absorption cross section (the advantages of no residue in the later period and the disadvantages of fast burnup and too fast and uncontrollable reactivity release), and the 167Er and 231Pa have a small neutron absorption cross section (the advantages of slow burnup and slow reactivity release and convenient control). Therefore, a fast-slow combination mode is adopted, if three kinds of materials are combined together, the fast-slow combination mode is formed, so that the advantages of fast burning poisons and slow burning poisons cannot be used for complementation, and two kinds of slow burning poisons are added into one assembly at the same time, so that the residual at the end of the service life is caused due to excessive content. Thus, by making a reasonable match combination of preferred burnable poisons, better reactivity control of the core is achieved and the core life is extended at the end of its life. When PACS-J and PACS-J are used231Pa2O3The combined core extended 18EFPD at the end of its life.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
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| CN (1) | CN113257441B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS835283A1 (en) * | 1983-11-11 | 1986-11-13 | Leonid N Goljand | Zarizeni k regulaci vykonu energetickeho bloku atomove elektrarny |
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2021
- 2021-05-11 CN CN202110510821.XA patent/CN113257441B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CS835283A1 (en) * | 1983-11-11 | 1986-11-13 | Leonid N Goljand | Zarizeni k regulaci vykonu energetickeho bloku atomove elektrarny |
Non-Patent Citations (2)
| Title |
|---|
| KENNETH ALLEN: "An advanced burnable poison for pressurized water reactors", 《HTTPS://WWW.RESEARCHGATE.NET/PUBLICATION/323390674》 * |
| 谢明亮: "先进聚合物可燃毒物燃耗特性分析", 《核科学与工程》 * |
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| Publication number | Publication date |
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| CN113257441B (en) | 2022-09-20 |
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