Supercritical water cooled reactor fuel assembly and reactor core

A technology of fuel assembly and water-cooled reactor, which is applied to fuel elements, greenhouse gas reduction, nuclear power generation, etc. It can solve the problems of difficult manufacturing, high manufacturing cost, and large radial size, and achieve the solution of increased flow-induced vibration and reduced manufacturing Difficulty and manufacturing size, effect of size reduction

Inactive Publication Date: 2013-10-23
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention also provides a supercritical water-cooled reactor single-flow core to overcome the problems of complex structure, large radial

Method used

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  • Supercritical water cooled reactor fuel assembly and reactor core
  • Supercritical water cooled reactor fuel assembly and reactor core
  • Supercritical water cooled reactor fuel assembly and reactor core

Examples

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Example Embodiment

[0038] Example 1:

[0039] Such as figure 1 with figure 2 As shown, a supercritical water-cooled reactor fuel assembly includes a shell assembly and a core provided in the shell assembly, and an air cavity 15 is provided in the middle of the core. The fuel assembly is divided into upper and lower parts. The upper housing assembly includes an upper assembly box 1, an upper moderator box 2 and an upper cladding shell 4. The upper moderator box 2 is arranged inside the upper component box 1, and the upper core body 3 is wrapped by the upper cladding 4 and is evenly arranged between the upper moderator box 2 and the upper component box 1. The lower housing assembly includes a lower assembly box 5, a lower moderator box 6 and a lower enclosure 8. The lower moderator box 6 is arranged inside the lower component box 5, and the lower core body 7 is wrapped by the lower cladding 8 and evenly arranged between the lower moderator box 6 and the lower component box 5. The upper shell comp...

Example Embodiment

[0046] Example 2:

[0047] Such as figure 1 As shown, this embodiment is based on embodiment 1, the upper shell assembly is made of Inconel718 alloy, and the upper core 3 235 U enrichment is 6.2%, and the lower core 7 has 235 U enrichment is 2.5%. When the existing fuel assembly is made of Inconel718 alloy, the core 235 The U enrichment degree is usually 6.2% to obtain the immortality factor (Kinf) required by the supercritical water-cooled reactor (the immortality factor characterizes the generation rate of neutrons in an infinite system than the rate of neutron disappearance). In this embodiment, in order to obtain the same immortality factor as the existing fuel assembly, the lower core 7 235 The U enrichment degree is set to 2.5%. Due to the unfavorable neutron absorption of zirconium alloy, 2.5% 235 U enrichment can be achieved with the 6.2% of the Inconel718 alloy 235 Immortal factors with the same U enrichment.

[0048] The feature of this embodiment lies in: 235 In the cas...

Example Embodiment

[0049] Example 3:

[0050] Such as figure 1 As shown, this embodiment is based on embodiment 1, the upper shell assembly is made of 310S steel, and the upper core 3 235 U enrichment is 5.6%, and the lower core 7 has 235 U enrichment is 2.5%. When the existing fuel assembly is made of 310S steel, the core 235 U enrichment is usually 5.6% to obtain the infinite multiplication factor required by supercritical water-cooled reactors. In this embodiment, in order to obtain the same immortality factor as the existing fuel assembly, the lower core 7 235 The U enrichment degree is set to 2.5%. Due to the unfavorable neutron absorption of zirconium alloy, 2.5% 235 U enrichment can be achieved with the 5.6% when using 310S steel 235 Immortal factors with the same U enrichment.

[0051] The feature of this embodiment lies in: 235 In the case of U loading, a supercritical water-cooled reactor fuel assembly with the same geometry and heating efficiency as the existing fuel assembly is provided,...

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Abstract

The invention discloses a supercritical water cooled reactor fuel assembly which comprises a shell assembly and a core body arranged inside the shell assembly and is characterized in that the fuel assembly is divided into an upper part and a lower part; the upper shell assembly is made of nickel base alloy or stainless steel and the lower shell assembly is made of zirconium alloy; and 235U enrichment degree of the upper core body is greater than 235U enrichment degree of the lower core body. The invention also discloses a supercritical water cooled reactor single-path reactor core. The invention has advantages as follows: packing volume of 235U is reduced and economical efficiency is high; complexity of the reactor core structure is decreased and the flow induced vibration increasing problem caused by a multipath structure is also solved; and it is beneficial to structural integrity of the fuel assembly.

Description

technical field [0001] The invention relates to the field of nuclear industry, in particular to a fuel assembly of a supercritical water-cooled reactor and a single-flow core of a supercritical water-cooled reactor. Background technique [0002] Supercritical water-cooled reactor (SCWR) is a fourth-generation nuclear energy system that has developed relatively rapidly in recent years. It has outstanding advantages such as high unit thermal efficiency and simplified system. Its thermal efficiency is as high as about 44%, and it has great advantages over other reactors in terms of economy. [0003] In order to improve its thermal efficiency, the supercritical water-cooled reactor adopts a higher core outlet temperature (about 500 ℃), and a larger core inlet and outlet temperature difference (about 220 ℃), and the mass flow rate of the coolant is about that of the pressurized water reactor. 1 / 10. Supercritical water-cooled reactors face two very prominent problems during cons...

Claims

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Application Information

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IPC IPC(8): G21C3/22G21C3/04
CPCY02E30/40Y02E30/30
Inventor 李庆王连杰张知竹杨平夏榜样于颖锐李翔李妍
Owner NUCLEAR POWER INSTITUTE OF CHINA
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