CN219085664U - Novel cladding with longitudinal corrugated profile for core fuel assembly - Google Patents
Novel cladding with longitudinal corrugated profile for core fuel assembly Download PDFInfo
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- CN219085664U CN219085664U CN202222582469.3U CN202222582469U CN219085664U CN 219085664 U CN219085664 U CN 219085664U CN 202222582469 U CN202222582469 U CN 202222582469U CN 219085664 U CN219085664 U CN 219085664U
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model relates to the technical field of fuel assemblies, and particularly discloses a novel cladding with a longitudinal corrugated outline, which is applied to a pressurized water reactor core fuel assembly, wherein the novel cladding consists of a cladding main body, a fuel core body and a longitudinal corrugated narrow flow passage; the fuel core body is contained in the novel cladding; the longitudinal corrugated narrow flow passage is formed by gaps of an upper novel cladding and a lower novel cladding, and forms a coolant passage; the new envelope has a longitudinal corrugated outer profile; the top and bottom profiles of the novel cladding can be completely spliced and embedded; the left end and the right end of the novel cladding are provided with horizontal sections in advance; the inside of the novel cladding is of a rectangular hollow structure so as to contain the fuel core. The novel cladding for the reactor core fuel assembly provided by the utility model enhances the transverse turbulence mixing effect in the narrow flow channel between the upper and lower novel cladding, and can realize high-efficiency heat exchange under the low Reynolds number operation condition of the pressurized water reactor.
Description
Technical Field
The utility model belongs to the technical field of fuel assemblies, and particularly relates to a structural innovation technology of a reactor core fuel assembly in a pressurized water reactor.
Background
In the operation process of a pressurized water reactor of a nuclear power station, the heat exchange performance of a reactor core fuel assembly is an important factor affecting the safety and the economy of the reactor. Therefore, the research of the reactor core fuel assembly is always in a very prominent position at home and abroad, and the heat exchange performance of the reactor core fuel assembly is continuously improved and the resistance characteristic of the reactor core fuel assembly is improved by optimizing the design of the reactor core fuel assembly, selecting advanced structural materials, improving the manufacturing process of the fuel assembly and other methods, so that the pressurized water reactor is promoted to develop in a safer and more economical direction.
Different from the bar bundle fuel assembly commonly assembled in the pressurized water reactor, the flat fuel assembly has the characteristics of compact structure, excellent heat transfer performance and large heat exchange area. The fuel core is the core component of a flat fuel assembly, consisting of an outer cladding and an inner fuel core. The fuel core plates are arranged in parallel, and the space in the fuel assembly is divided into narrow rectangular channels which are not communicated with each other by the outer cladding of the fuel core plates.
During normal operation of the core, high-pressure supercooled water enters from one end of the fuel assembly and flows out from the other end, and fission heat generated inside the fuel core plate is mainly taken away in a convection heat exchange mode when passing through the narrow channels. However, under low flow, high-split hot conditions, the heat exchange capacity of conventional rectangular flat fuel assemblies is insufficient to meet core heat exchange requirements, which is manifested by an increase in core outlet coolant temperature, an increase in core fuel assembly internal hot spot temperature, resulting in overheating of the core, a reduction in core fuel assembly life, and a challenge to nuclear reactor safety.
The cladding serves as an isolation barrier between the fuel core and the coolant, has the important functions of containing fission products, preventing the fission products from leaking out and avoiding the reaction of the fuel core and the coolant, and is the first safety barrier of the nuclear power station. The cladding structure is reasonably designed, so that heat generated after nuclear fuel fission can be effectively guided out, and the heat exchange performance of the reactor core fuel assembly is improved.
Therefore, how to design a novel cladding for the reactor core fuel assembly, which can effectively improve the heat exchange performance of the novel cladding, so as to meet the heat exchange requirement of the pressurized water reactor core under the working condition of low Reynolds number, and the novel cladding has important practical value.
In view of this, the present utility model has been made.
Disclosure of Invention
The utility model aims to explore a novel design scheme of a special-shaped narrow flow channel structure aiming at enhancing heat exchange, and provides a novel cladding with a longitudinal corrugated profile for a reactor core fuel assembly, which can further improve the heat exchange performance of the reactor core fuel assembly and improve the economy of a reactor on one hand; on the other hand, the temperature distribution in the fuel assembly can be improved, the temperature safety margin of the reactor core fuel assembly is improved, and the reactor core safety of the reactor is improved.
The utility model is realized by the following technical scheme:
a new cladding having a longitudinal corrugated profile for a core fuel assembly, the new cladding being the subject of the utility model;
the novel cladding is internally provided with a fuel core body capable of generating cracking heat;
the novel cladding is arranged in a parallel mode, a gap between the two novel cladding forms a channel of coolant (namely high-pressure supercooling water), and the coolant channel is a longitudinal corrugated narrow flow channel.
Further, the method comprises the steps of,
the novel cladding has a bi-directional sinusoidal outer profile along a width direction and a length direction, the outer profile of the novel cladding being formed by a transverse sinusoidal sweep along a longitudinal sinusoidal sweep; the outside of novel cladding is in direct contact with high-pressure supercooled water, and the inside is rectangular hollow structure for containing reactor core fuel core.
Further, the method comprises the steps of,
the novel cladding is in an asymmetric structure in the height direction, the top outline and the bottom outline of the novel cladding can be completely spliced and embedded through translation, and the size of a gap between the upper novel cladding and the lower novel cladding is constant at any position.
Further, the method comprises the steps of,
the longitudinal corrugated narrow runner is formed by a gap between the outer contours of the upper novel cladding and the lower novel cladding, the fluid medium in the longitudinal corrugated narrow runner is high-pressure supercooled water, and the runner gap of the longitudinal corrugated narrow runner is not more than 2mm.
Further, the method comprises the steps of,
the fuel core is a pressurized water reactor core fuel core which is contained in a novel cladding, and the size parameter of the fuel core is determined according to the actual heat exchange requirement of the pressurized water reactor.
Further, the method comprises the steps of,
the novel cladding presents an asymmetric structure in the width direction, and the longitudinal ripple curve-shaped outer contour of the novel cladding is positioned at the center of the cladding main body, namely, the base line of the longitudinal sine ripple curve outer contour coincides with the center line in the width direction of the cladding main body.
Further, the method comprises the steps of,
the thickness of the novel cladding is periodically thickened and thinned along the width direction and the length direction, and a minimum threshold value exists for meeting the corrosion and strength requirements; at the same time, the thickness of the novel cladding should not be excessively large so as to weaken the influence of the thermal stress inside the cladding caused by uneven thickness.
Further, the method comprises the steps of,
the horizontal sections are preset at the left end and the right end of the novel cladding along the width direction, namely at the positions connected with the longitudinal corrugated outer contour, so that the novel cladding is convenient to process and install; the dimension of the horizontal segment also follows the rule of sine function along the length direction, and the dimension of the horizontal segment is not less than 0.5mm.
Further, the method comprises the steps of,
the contact area of the novel cladding with the longitudinal corrugated outer contour and the high-pressure supercooled water in the outer flow passage is not less than 1.4 times of that of the traditional rectangular cladding with the same overall size.
Further, the method comprises the steps of,
the longitudinal corrugated outer profile of the novel cladding strictly obeys the change rule of a sine function, and the size parameters such as the corrugated amplitude, the corrugated period number, the corrugated wavelength and the like of the sine corrugated curve are calculated and determined according to the length direction span and the width direction span of the fuel core body and the actual heat exchange requirement of the pressurized water reactor.
By adopting the technical scheme, compared with the prior art, the utility model has the following beneficial effects.
1. The novel cladding adopts a longitudinal sine wave-shaped external contour, and the heat exchange quantity is increased by increasing the heat transfer area between the cladding and the coolant.
2. The novel cladding adopts a longitudinal sine corrugated external contour, and enhances the heat exchange effect by enhancing the transverse turbulence mixing effect in the longitudinal corrugated narrow flow channel, so that the heat exchange enhancement of the pressurized water reactor under the low Reynolds number operation condition can be realized, and the economy of the reactor is improved.
3. The novel cladding can effectively lead out fission heat generation in the fuel core body, meet the heat exchange requirement under the working conditions of low flow and high fission heat generation in the pressurized water reactor, and improve the safety of the reactor.
4. The novel cladding can improve the temperature distribution inside the fuel core and the cladding, reduce the hot spot temperature inside the fuel assembly, improve the temperature safety margin of the reactor core fuel assembly, and improve the safety of the reactor.
The following describes the embodiments of the present utility model in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:
FIG. 1 is a schematic view of the entirety of a cladding, fuel core and longitudinal corrugated narrow flow passage of the present utility model;
FIG. 2 is an elevation view of the cladding, fuel core and longitudinal corrugated narrow flow passage of the present utility model;
FIGS. 3 and 4 are schematic illustrations of the assembly of the cladding and fuel core of the present utility model;
FIG. 5 is an elevation view of a novel cladding having a longitudinal corrugated profile for a core fuel assembly of the present utility model;
FIGS. 6 and 7 are enlarged partial views of a novel cladding having a longitudinal corrugated profile for a core fuel assembly of the present utility model;
FIG. 8 is an isometric view of a novel cladding having a longitudinal corrugated profile for a core fuel assembly of the present utility model;
FIG. 9 is an enlarged view of a portion of a novel cladding having a longitudinal corrugated profile for a core fuel assembly of the present utility model.
In the figure: 1. a novel cladding body; 2. a fuel core contained within the novel cladding; 3. the two novel shells are arranged in parallel to form a longitudinal corrugated narrow runner; 4. a transverse sinusoidal wave curve profile of the new envelope; 5. longitudinal sinusoidal wave curve profile of the new envelope; 6. a horizontal section at the left end of the novel cladding; 6. a horizontal section at the right end of the novel cladding; 8. the novel rectangular hollow cavity inside the cladding.
It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present utility model, and the following embodiments are used to illustrate the present utility model, but are not intended to limit the scope of the present utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
As shown in fig. 1 to 4, the novel cladding 1 with a longitudinal corrugated profile for a fuel assembly of a reactor core of the present utility model, the inside of the novel cladding 1 is cooperatively connected with the fuel core 2 of the reactor core, the fuel core 2 can be directly inserted into the novel cladding 1 from one end, and fission heat generated inside the fuel core 2 is transferred to the novel cladding 1 in a heat-conducting manner. The novel cladding 1 is arranged in the reactor core in a parallel arrangement mode, a gap formed by the outer contours of the upper novel cladding 1 and the lower novel cladding 1 forms a longitudinal corrugated narrow flow channel 3, a coolant (high-pressure supercooled water) flows in from one end and flows out from the other end, and heat of the novel cladding 1 is mainly transferred to the coolant in the longitudinal corrugated narrow flow channel 3 in a convection heat exchange mode.
In some embodiments, the flow channel height of the longitudinal corrugated narrow flow channel 3 can be realized by adjusting the gap between the two novel cladding 1, and changing the size of the gap between the two novel cladding 1 can change the cross turbulence mixing effect in the longitudinal corrugated narrow flow channel 3, so as to obtain reactor core fuel assemblies with different heat exchange capacities, so as to meet different nuclear reactor heat exchange requirements.
As shown in fig. 5 to 9, a structural illustration of a novel cladding body for a core fuel assembly with a longitudinal corrugated profile, the outer profile of which is formed by a transversal corrugated curve profile 4 swept along a longitudinal corrugated curve profile 5, said transversal corrugated curve profile 4 and longitudinal corrugated curve profile 5 strictly following a sinusoidal function variation law (h=a×sin (2n/l)); wherein A is the ripple amplitude, n is the ripple cycle number, and l is the transverse or longitudinal total span of the ripple curve; the thickness of the novel cladding 1 is not selected at will, and on the premise of meeting the requirements of certain strength and corrosion margin, the heat transfer area of the novel cladding 1 and the coolant in the longitudinal corrugated narrow flow channel 3 can be changed by adjusting the parameters, so that the novel cladding 1 with different heat exchange capacities is obtained, and the novel cladding is suitable for different nuclear reactor heat exchange requirements. The two ends of the novel cladding 1 are connected with the transverse ripple curve profile 4 and are provided with a left end horizontal section 6 and a right end horizontal section 7 so as to facilitate processing and installation; the two horizontal segments 6, 7 are complementary in size, and the horizontal segment size also follows a sine function variation law along the length direction. The novel cladding 1 is internally provided with a rectangular hollow cavity 8, the rectangular hollow cavity 8 can be directly matched and connected with the fuel core 2 for containing the fuel core 2, and the size of the rectangular hollow cavity 8 is determined according to the actual structural parameters of the fuel core 2.
In particular, the utility model relates to a new cladding with a longitudinal corrugated profile for a fuel assembly for a reactor core, the gap between the two new cladding 1 being 2mm. According to the low Reynolds number operation condition of the pressurized water reactor, numerical calculation verification is carried out on the heat exchange characteristic of the cladding 1, so that the contact heat transfer area between the longitudinal corrugated narrow runner 3 and the novel cladding 1 can be increased, the transverse turbulence mixing effect in the longitudinal corrugated narrow runner 3 is enhanced, the heat exchange capacity of the reactor core fuel assembly is effectively improved, meanwhile, the hot spot temperature in the novel cladding 1 and the fuel core 2 can be reduced, the temperature safety margin of the reactor core fuel assembly is effectively improved, and the safety and the economical efficiency of the pressurized water reactor are further improved.
The foregoing description is only illustrative of the preferred embodiment of the present utility model, and is not to be construed as limiting the utility model, but is to be construed as limiting the utility model to any and all simple modifications, equivalent variations and adaptations of the embodiments described above in accordance with the teachings of the present utility model, which are within the purview of the present utility model, can be made by those skilled in the art without departing from the scope of the utility model.
Claims (10)
1. A novel cladding having a longitudinal corrugated profile for a core fuel assembly, comprising:
a novel cladding, the novel cladding being a main body;
the fuel core body is contained in the novel cladding;
the longitudinal corrugated narrow flow passage is formed by gaps of an upper novel cladding and a lower novel cladding, and a coolant passage is formed.
2. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 1, wherein:
the new envelope has a longitudinal corrugated outer profile formed by a transverse sinusoidal wave curve swept along the longitudinal sinusoidal wave curve; the outside of novel cladding is in direct contact with high-pressure supercooled water, and the inside is rectangular hollow structure for containing reactor core fuel core.
3. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 2, wherein:
the novel cladding is in an asymmetric structure in the height direction, the top outline and the bottom outline of the novel cladding can be completely spliced and embedded through translation, and the size of a gap between the upper novel cladding and the lower novel cladding is constant at any position.
4. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 1, wherein:
the gap between the outer contours of the novel cladding forms a longitudinal corrugated narrow flow passage, the fluid medium in the longitudinal corrugated narrow flow passage is high-pressure supercooled water, and the flow passage gap of the longitudinal corrugated narrow flow passage is not more than 2mm.
5. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 1, wherein:
the novel cladding internally contains a fuel core body, and the size parameter of the fuel core body is determined according to the actual heat exchange requirement of the pressurized water reactor.
6. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 2, wherein:
the novel cladding presents an asymmetric structure in the width direction, and the longitudinal corrugated outer contour of the novel cladding is positioned at the center of the cladding main body, namely, the base line of the longitudinal corrugated outer contour coincides with the center line of the cladding main body in the width direction.
7. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 2, wherein:
the thickness of the novel cladding is periodically thickened and thinned along the width direction and the length direction, and a minimum threshold value exists for meeting the corrosion and strength requirements; at the same time, the thickness of the novel cladding should not be excessively large so as to weaken the influence of the thermal stress inside the cladding caused by uneven thickness.
8. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 2, wherein:
the horizontal sections are preset at the left end and the right end of the novel cladding along the width direction, namely at the positions connected with the longitudinal corrugated outer contour, so that the novel cladding is convenient to process and install; the dimension of the horizontal segment also follows the rule of sine function along the length direction, and the dimension of the horizontal segment is not less than 0.5mm.
9. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 2, wherein:
the contact area of the novel cladding and the high-pressure supercooled water in the external narrow flow passage is not less than 1.4 times of that of the traditional rectangular cladding with the same overall size.
10. The novel cladding with longitudinal corrugated profile for a core fuel assembly of claim 9, wherein:
the longitudinal corrugated outer profile of the novel cladding strictly obeys the change rule of a sine function, and the corrugated amplitude, the corrugated period number and the corrugated wavelength of the sine corrugated curve are calculated and determined according to the length direction span and the width direction span of the fuel core body and the actual heat exchange requirement of the pressurized water reactor.
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| CN202222582469.3U CN219085664U (en) | 2022-09-28 | 2022-09-28 | Novel cladding with longitudinal corrugated profile for core fuel assembly |
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| CN202222582469.3U CN219085664U (en) | 2022-09-28 | 2022-09-28 | Novel cladding with longitudinal corrugated profile for core fuel assembly |
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