CN113921155B - Critical experimental device for spent fuel - Google Patents

Critical experimental device for spent fuel Download PDF

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Publication number
CN113921155B
CN113921155B CN202111389063.7A CN202111389063A CN113921155B CN 113921155 B CN113921155 B CN 113921155B CN 202111389063 A CN202111389063 A CN 202111389063A CN 113921155 B CN113921155 B CN 113921155B
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spent fuel
mounting unit
fuel
new fuel
guide
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CN202111389063.7A
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CN113921155A (en
Inventor
陈善发
陈效先
夏兆东
周琦
成昱廷
李开健
章秩烽
徐健平
吕牛
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China Institute of Atomic of Energy
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China Institute of Atomic of Energy
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    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21CNUCLEAR REACTORS
    • G21C19/00Arrangements 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
    • G21C19/40Arrangements for preventing occurrence of critical conditions, e.g. during storage
    • GPHYSICS
    • G21NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21CNUCLEAR REACTORS
    • G21C19/00Arrangements 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
    • G21C19/02Details of handling arrangements
    • G21C19/06Magazines for holding fuel elements or control elements
    • G21C19/07Storage racks; Storage pools
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00Energy generation of nuclear origin
    • Y02E30/30Nuclear 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 embodiment of the invention discloses a critical experimental device for spent fuel, which comprises the following components: the bottom of the reactor core container is provided with a guide hole; a guide tube fixed at the guide hole in the core vessel, the guide tube being used for placing the spent fuel, the guide hole being used for providing a duct for the input and output of the spent fuel; a plurality of installation units arranged in the core vessel in an array around the guide pipe, the installation units being for installing new fuel elements; wherein, the top of the guide pipe is closed for isolating the water environment of the new fuel element. The embodiment of the invention adopts a mode of combining part of spent fuel and part of new fuel to carry out a spent fuel critical experiment, and a closed guide pipe is arranged on a critical experimental device of the spent fuel and is specially used for temporarily storing the spent fuel and isolating the water environment of the spent fuel and the new fuel so as to avoid radioactive pollution.

Description

Critical experimental device for spent fuel
Technical Field
The embodiment of the invention relates to the technical field of spent fuel aftertreatment, in particular to a critical experimental device for spent fuel.
Background
In the aspect of the post-treatment of the spent fuel, the existing post-treatment efficiency of the spent fuel is low, so that only the spent fuel which is not treated yet can be stored, and the most extensive countermeasure at the present stage is still to store the spent fuel. However, due to the lack of critical experimental data of the spent fuel, the validity and accuracy of the critical calculation procedure of the spent fuel are to be verified, so that most of the spent fuel storage methods still store according to the standard of the new fuel, which greatly increases the storage cost of the spent fuel. Therefore, a critical experimental device for carrying out the spent fuel reactivity effect experiment is needed.
Disclosure of Invention
The embodiment of the invention provides a critical experimental device for spent fuel, which comprises the following components: the bottom of the reactor core container is provided with a guide hole; a guide tube fixed at the guide hole in the core vessel, the guide tube being used for placing the spent fuel, the guide hole being used for providing a duct for the input and output of the spent fuel; a plurality of installation units arranged in the core vessel in an array around the guide pipe, the installation units being for installing new fuel elements; wherein, the top of the guide pipe is closed for isolating the water environment of the new fuel element.
Drawings
Other objects and advantages of the present invention will become apparent from the following description of embodiments of the present invention, which is to be read in connection with the accompanying drawings, and may assist in a comprehensive understanding of the present invention.
FIG. 1 is a schematic structural diagram of a critical experimental setup for spent fuel according to one embodiment of the invention.
Fig. 2 is a top view of the critical experimental setup of the spent fuel of fig. 1.
It should be noted that the drawings are not necessarily to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.
Reference numerals illustrate:
100. Spent fuel; 10. a core vessel; 11. a guide hole;
200. A new fuel element; 20. a guide tube;
30. An installation unit; 31. a first grid plate; 32. a second grid plate; 33. a support column;
40. A support part; 41. a bottom plate; 42. a floor support.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. It will be apparent that the described embodiments are one embodiment, but not all embodiments, of the present invention. All other embodiments, which can be made by a person skilled in the art without creative efforts, based on the described embodiments of the present invention fall within the protection scope of the present invention.
It is to be noted that unless otherwise defined, technical or scientific terms used herein should be taken in a general sense as understood by one of ordinary skill in the art to which the present application belongs. If, throughout, reference is made to "first," "second," etc., the description of "first," "second," etc., is used merely for distinguishing between similar objects and not for understanding as indicating or implying a relative importance, order, or implicitly indicating the number of technical features indicated, it being understood that the data of "first," "second," etc., may be interchanged where appropriate. If "and/or" is present throughout, it is meant to include three side-by-side schemes, for example, "A and/or B" including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. Furthermore, for ease of description, spatially relative terms, such as "above," "below," "top," "bottom," and the like, may be used herein merely to describe the spatial positional relationship of one device or feature to another device or feature as illustrated in the figures, and should be understood to encompass different orientations in use or operation in addition to the orientation depicted in the figures.
FIG. 1 shows a schematic structural diagram of a critical experimental setup for spent fuel according to one embodiment of the invention. Fig. 2 shows a top view of the critical experimental setup of spent fuel in fig. 1. As shown in fig. 1 and2, the critical experimental facility for spent fuel in the present embodiment includes a core vessel 10, a guide pipe 20, and a plurality of installation units 30. The bottom of the reactor core vessel 10 is provided with a guide hole 11, a guide pipe 20 is fixed at the guide hole 11 in the reactor core vessel 10, and the guide pipe 20 is used for placing the spent fuel 100. A plurality of mounting units 30 are disposed in the core vessel 10 in an array around the guide pipe 20, and the mounting units 30 are used for mounting new fuel elements 200. Wherein the top end of the guide tube 20 is closed for isolating the water environment of the new fuel element 200.
The critical experiment device in the embodiment can be used for carrying out a critical experiment of the spent fuel in a form of combining part of the spent fuel with part of the new fuel. The injection of moderator (e.g., water) into the core vessel can simulate the situation where spent fuel is stored in a pool, and the top end of the guide tube 20 is closed, which can isolate the spent fuel from the water environment of the fresh fuel, thereby avoiding radioactive pollution of the experimental environment by the highly radioactive spent fuel and even endangering personnel safety. By using the critical experimental device provided by the embodiment of the invention, the situation that the spent fuel is stored in the water pool can be simulated, the critical experiment can be carried out on the spent fuel, and support data is provided for the storage of the spent fuel.
In some embodiments, the lower port of the guide tube 20 is located at the lower portion of the core vessel 10 and is matched and communicated with the guide hole 11 to perform the input and output operations of the spent fuel 100 from below the core vessel 10. In this embodiment, the spent fuel 100 can be transported into the guide tube 20 through the guide hole 11 at the bottom of the reactor vessel 10, and the guide tube 20 not only can be used for temporarily storing the spent fuel sample, but also can guide the spent fuel when the spent fuel sample is input into the reactor vessel 10, so that the spent fuel is installed at a preset position in the reactor vessel 10.
Alternatively, the mounting units 30 for mounting the new fuel elements 200 may be arranged in a3×3 array, the unit at the center of the 3×3 array being left free, the mounting units 30 being not provided, and the guide pipes 20 being provided at the positions such that the guide pipes 20 and 8 mounting units together form a3×3 array. By adopting the arrangement, the new fuel elements 200 are arranged around the spent fuel 100, so that the new fuel has certain symmetry, the 3×3 array arrangement can make the experimental device more compact, and the loading capacity of the new fuel elements is reduced on the premise of completing the experiment.
In the present embodiment, a plurality of new fuel elements 200 may be provided on each mounting unit 30. A plurality of the new fuel elements 200 are arranged in an array on the mounting unit 30, thereby constituting a new fuel assembly. For example, for a new fuel element of low enrichment (4.95% for example), 81 new fuel elements 200 may be provided on the mounting unit 30 in a 9 x 9 array arrangement to constitute a new fuel assembly. The 8 new fuel assemblies and the spent fuel are arranged according to a3×3 array.
In this embodiment, the plurality of new fuel elements are divided into the plurality of new fuel assemblies by the plurality of mounting units, so that the situation that spent fuel is stored in the water pool can be simulated. According to the embodiment, the arrangement mode is adopted to arrange the new fuel elements and the spent fuel to perform core arrangement, so that critical experiments of various kinds of core arrangement with various enrichment degrees can be realized, and the critical state is achieved by controlling the number of the fuel elements in the number of the loaded new fuel assemblies during the experiments.
In some embodiments, the position between each of the mounting units 30 may be selectively movable. The position of the mounting unit 30 loaded with new fuel elements can be moved so that a moderating zone can be formed between each new fuel assembly. In addition, the width of the moderating zone may also be adjusted by moving the mounting units 30 to change the spacing between the mounting units 30 to create a different spacing between new fuel assemblies.
As shown in fig. 1 and 2, the critical experimental apparatus in the present embodiment further includes a support part 40, the support part 40 being provided at the bottom of the core vessel 10, and the support part 40 being provided around the guide pipe 20; each of the mounting units 30 is movably coupled to the support 40. In some embodiments, the support 40 is fixed to the bottom of the core vessel 10 for supporting each of the mounting units 30.
Further, the support 40 includes a bottom plate 41 and a bottom plate support 42, the installation unit is movably coupled to the bottom plate 41, the bottom plate support 42 is fixed to the bottom of the core vessel 10, and the bottom plate 41 is coupled to the bottom plate support 42. Alternatively, the floor support 42 may have a column shape, and the floor is fixed to the column-shaped floor support 42, so that the plurality of mounting units 30 may be mounted on a flat floor.
Wherein the supporting portion 40 is disposed around the guide tube 20, and specifically includes: the bottom plate 41 surrounds the guide tube 20. Specifically, the bottom plate 41 is provided with a through hole matched with the guide tube 20, the position of which corresponds to the position of the guide tube 20, through which the guide tube 20 passes and is fixed in the core vessel 10.
In some embodiments, at least one sliding portion (not shown) is disposed on the mounting unit 30, and a plurality of sliding rails (not shown) disposed perpendicular to each other are disposed on the supporting portion 40, and the sliding portions cooperate with the sliding rails to enable the mounting unit 30 to be slidably connected to the supporting portion 40, so as to enable movement of each mounting unit 30 on the supporting portion 40.
Specifically, the slide rails may be provided on the bottom plate 41, and in addition, a plurality of slide rails are arranged on the bottom plate 41 in a grid-like manner perpendicular to each other, so that the mounting unit 30 can be moved to an arbitrary position on the bottom plate 41. In addition, the sliding part may be a universal wheel, at least one universal wheel is disposed at the bottom of the installation unit 30, for example, one universal wheel is disposed at four corners of the bottom of the installation unit 30, and the universal wheel may be embedded in a sliding rail on the supporting part 40, so that the movement of the installation unit is realized through the cooperation of the universal wheel and the sliding rail.
Further, the critical experimental device in this embodiment further includes a fixing member (not shown in the drawings) disposed on the supporting portion 40 or the mounting unit 30, for fixing the mounting unit 30 to the supporting portion 40. For example, a fixing member is provided on the bottom plate 41 at a position close to the slide rail, or a fixing member is provided on the bottom of the mounting unit 30 at a position close to the sliding portion, and the mounting unit 30 may be fixed at this position by the fixing member after the mounting unit 30 is moved to a proper position, so as to prevent the sliding of the mounting unit 30 during the experiment. The fixing member may be any member for fixing the sliding portion of the mounting unit 30, for example, a bolt, a stopper, or the like.
As shown in fig. 1, in the present embodiment, the mounting unit 30 includes a first grid plate 31, a second grid plate 32, and support columns 33. The first grid plate 31 is movably connected to the supporting portion 40, for example, a sliding portion is provided on a lower surface of the first grid plate, so that the sliding portion cooperates with a sliding rail provided on the supporting portion 40 to realize movement of the first grid plate 31. The support columns 33 are connected at both ends to the first and second grid plates 31 and 32, respectively, and the support columns 33 may serve to support the second grid plate 32. The new fuel element 200 is mounted between the first and second grid plates 31, 32. In other embodiments, the new fuel element 200 may also be mounted on the first grid plate 31 and pass through the second grid plate 32, and the second grid plate 32 is located in a position above the middle of the new fuel element 200. Wherein a plurality of grids are provided on the first and second grid plates 31 and 32, and each new fuel element 200 is respectively provided in the grids.
Further, the grids on the first and second grid plates 31 and 32 are arranged in an array so that the new fuel elements can be arranged in an array on the first and second grid plates 31 and 32.
The present embodiment can prevent the new fuel element 200 from being inclined by being disposed only on the first grid plate 31 when the new fuel element 200 is long by limiting the new fuel element 200 by the second grid plate 32. The first grid plate 31 and the second grid plate 32 together enable the installation and fixation of new fuel elements.
In other embodiments, it is also possible to fix the support column 33 on the bottom plate 41 of the support portion 40, and provide a connection plate at the other end of the support column 33 away from the bottom plate 41, and support the connection plate by the support column 33. And are provided on the same slide rails on the bottom plate 41 at the lower surface of the connection plate. The mounting unit 30 includes a first grid plate 31 and a second grid plate 32, sliding parts are provided on the first grid plate 31 and the second grid plate 32, the first grid plate 31 is movably connected to the supporting part 40, and simultaneously, the second grid plate 32 is movably connected under the connection plate, and the new fuel element 200 is connected between the first grid plate 31 and the second grid plate 32, so that the mounting unit 30 moves between the connection plate and the supporting part 40.
In this embodiment, the critical experimental apparatus further includes a control rod and/or a safety rod (not shown in the drawings) disposed in the interval between the guide pipe 20 and the installation unit 30, so that the control rod and/or the safety rod may be disposed without affecting the arrangement of the spent fuel and the new fuel elements such that the control rod and/or the safety rod does not occupy the space of the spent fuel or the new fuel elements.
Further, the control rod and/or the safety rod is plate-shaped, thereby reducing the space width occupied by the control rod and/or the safety rod, making it easier for the control rod and/or the safety rod to be disposed in the gap between the guide tube 20 and the mounting unit 30. The control rod and/or the safety rod in the embodiment are/is designed in an elongated plate shape, so that the surface area of the absorber can be effectively increased under the condition of a certain volume, and the value of the control rod and/or the safety rod is increased.
In this embodiment, the core vessel 10 may be a tank-like vessel, for example, a stainless steel tank-like vessel. Specifically, the upper portion of the core vessel is opened so that the support 40, the installation unit 30 loaded with new fuel elements, and the like can be disposed therein to complete the construction of the experimental apparatus to perform the critical experiments.
By adopting the critical experimental device in the embodiment of the invention, the critical experiment can be performed by taking the new fuel with low enrichment degree as a fuel main body and taking the spent fuel as the combination mode of experimental samples. The spent fuel is temporarily stored through the special shielding pipeline of the guide pipe, so that radioactive pollution of the spent fuel is avoided, and the situation that the spent fuel is in a water pool can be simulated. The device can be used for carrying out a spent fuel critical benchmark experiment and a spent fuel reactivity measurement experiment, and provides data support for spent fuel storage.
In the case of performing the critical experiment using the critical experimental apparatus in this embodiment, water needs to be injected into the core vessel 10 as a moderator. In controlling the reactivity, the reactivity may be controlled by adjusting the water level height, or may also be controlled using a control rod.
In designing the critical experimental setup in the described embodiments, a Monte Carlo procedure may be utilized to develop core physical design work. The number and arrangement of new fuel elements in each mounting unit, and the arrangement of the plurality of mounting units, can be determined by critical mass calculations. In addition, theoretical calculation software can be used for determining the optimal slow grid distance of the new fuel element in the new fuel assembly so as to save fuel consumption.
Taking UO 2 with low enrichment as a new fuel element as an example, it was determined by critical mass calculation that every 9×9 new fuel elements were mounted to the mounting unit 30, thereby constituting a new fuel assembly. The critical mass calculation also determines that the new fuel assemblies are distributed in a square grid mode according to a3×3 array, the new fuel assemblies in the second row and the second column are empty in the integral grid plate, a guide pipe 20 for temporarily storing spent fuel samples is arranged in the new fuel assemblies, and the top end of the guide pipe 20 is closed so as to isolate the water environment of the spent fuel and the new fuel.
To simulate different fuel assembly spacing when spent fuel is stored in the pool, the critical experimental setup in this embodiment was divided into 8 new fuel assemblies in the manner shown in fig. 2, with the new fuel assemblies being free to move to create different moderation distances. 2 sets of safety bars and 2 sets of control bars are arranged in the interval between the spent fuel guide pipe at the central position and the surrounding new fuel assemblies, wherein the control bars can be plate-shaped in structure.
Finally, all the components are arranged in a stainless steel tank-like vessel as a core vessel, thereby completing the arrangement of the core to perform the critical experiments. The lower port of the guide pipe 20 is located at the lower portion of the reactor vessel, and allows the spent fuel to enter and exit the reactor from below the reactor vessel.
It should also be noted that, in the embodiments of the present invention, the features of the embodiments of the present invention and the features of the embodiments of the present invention may be combined with each other to obtain new embodiments without conflict.
The present invention is not limited to the above embodiments, but the scope of the invention is defined by the claims.

Claims (6)

1. A critical experimental device for spent fuel, comprising:
the bottom of the reactor core container is provided with a guide hole;
a guide tube fixed at the guide hole in the core vessel, the guide tube being used for placing the spent fuel, the guide hole being used for providing a duct for the input and output of the spent fuel;
A plurality of installation units arranged in the core vessel in an array around the guide pipe, the installation units being for installing new fuel elements;
wherein the top end of the guide pipe is closed and is used for isolating the water environment of the new fuel element;
selectively movable positions between the mounting units;
The installation units for installing new fuel elements are arranged in a3×3 array, the units at the central position of the 3×3 array are vacated, no installation units are arranged, and the guide pipes are arranged at the positions, so that the guide pipes and 8 installation units form a3×3 array together;
Further comprises: a support portion provided at a bottom of the core vessel, and surrounding the guide tube;
each mounting unit is movably connected to the supporting part;
at least one sliding part is arranged on the mounting unit;
The support part is provided with a plurality of sliding rails which are mutually perpendicular, the sliding part is matched with the sliding rails, and the mounting unit is slidably connected to the support part;
The support portion includes:
the sliding rail is arranged on the bottom plate;
A floor support fixed to a bottom of the core vessel, the floor being connected to the floor support;
the plurality of sliding rails are mutually perpendicular and are arranged on the bottom plate in a grid shape, so that the mounting unit moves to any position on the bottom plate.
2. The threshold test device of claim 1, further comprising: the fixing piece is arranged on the supporting portion or the mounting unit and used for fixing the mounting unit on the supporting portion.
3. The threshold test device of claim 1, wherein the mounting unit comprises:
a first grid plate movably connected to the support part;
a second grid plate, the new fuel element being mounted between the first and second grid plates;
And the support columns are connected between the first grid plate and the second grid plate and used for supporting the second grid plate.
4. The threshold test device of claim 1, wherein a plurality of the new fuel elements are arranged in an array on the mounting unit.
5. The threshold test device of claim 1, further comprising:
and a control rod and/or a safety rod disposed in a space between the guide tube and the mounting unit.
6. The critical experimental device according to claim 5, wherein the control rod and/or safety rod is plate-shaped.
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基于SCALE的RFA改进型燃料组件堆内贮存临界安全分析;攸国顺;李铁萍;韩向臻;王喆;兰兵;黄旭阳;;核电子学与探测技术(11);全文 *
基于SCALE的压水堆乏燃料贮存水池临界安全分析;韩向臻;攸国顺;潘昕怿;冯进军;王昆鹏;兰兵;;核电子学与探测技术(04);全文 *
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采用燃耗信任制的乏燃料水池密集贮存研究及临界安全分析;夏兆东;周小平;李晓波;吕牛;朱庆福;;中国原子能科学研究院年报(00);全文 *

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