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Single-flow supercritical water cooled reactor based on regular hexagonal fuel assemblies

A regular hexagonal, fuel assembly technology, applied in the assembly of fuel elements, fuel elements, reduction of greenhouse gases, etc., can solve the problems of complicated fuel assembly and core structure, reduced engineering achievability, etc., to improve the core outlet. Effects of temperature and safety, improved engineering feasibility, and improved fuel economy

Active Publication Date: 2020-02-28
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] To sum up, the main problems faced in the design of fuel assemblies and cores are: in order to achieve sufficient and uniform moderation of each fuel rod in the fuel assembly, multiple "water rods" must be arranged evenly; For the process coolant to be effectively divided inside the core, a special structure for high and low temperature fluid isolation must be installed on the upper and lower ends of the fuel assembly and in the reactor. Although the above design method ensures fuel economy, safety and technical indicators, the fuel assembly and the core The structure tends to become more complex, and the engineering feasibility is greatly reduced

Method used

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  • Single-flow supercritical water cooled reactor based on regular hexagonal fuel assemblies
  • Single-flow supercritical water cooled reactor based on regular hexagonal fuel assemblies
  • Single-flow supercritical water cooled reactor based on regular hexagonal fuel assemblies

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Embodiment 1

[0033]This embodiment provides a regular hexagonal fuel assembly, in which a guide pipe 1 is coaxially arranged at the center of the regular hexagonal fuel assembly, and a control rod bundle 4 is coaxially arranged in the guide pipe 1; One support tube 2 is coaxially arranged, a total of 6 support tubes 2; 192 fuel rods 3 are coaxially arranged between the side and the center of the regular hexagonal fuel assembly.

[0034] The outer diameter of each fuel rod 3 is 9.5mm, the wall thickness is 0.65mm, the cladding material is SiC, and the core body is UO 2 ceramics, the outer diameter of the core is 8.0 mm; the center-to-center distance between adjacent fuel rods 3 is 10.8 mm, which is used as a coolant flow channel. The cladding material of the fuel rod 3 is silicon carbide.

[0035] The guide pipe 1 occupies N grid positions at the center of the regular hexagonal fuel assembly, and N is a positive integer ≥ 2. In this embodiment, the guide pipe 1 occupies 19 grid positions a...

Embodiment 2

[0039] This embodiment provides a single-flow supercritical water-cooled reactor, which includes 253 regular hexagonal channels 7, and the 253 regular hexagonal channels are adjacent to each other to form a honeycomb integral structure. Basket 10 and pressure vessel 11. The regular hexagonal channel 7 is used to accommodate the regular hexagonal fuel assembly described in Embodiment 3, the wall thickness of each regular hexagonal channel 7 is 2.0 mm, the distance between the centers of the adjacent regular hexagonal channels 7 is 164.0 mm, and the structural material is stainless steel, honeycomb The diameter of the circumscribed circle of the monolithic structure core is 2900mm. The inner side of the metal reflective layer 8 is an irregular polygonal structure in contact with the outer side of the honeycomb monolithic structure, and the outer diameter of the metal reflective layer 8 is 3000mm. The outer diameter of the hanging basket 10 is 3060mm, and the wall thickness of t...

Embodiment 3

[0041] Based on the single-flow supercritical water-cooled reactor fuel management method provided in Embodiment 2:

[0042] In this embodiment, a coolant flow distributor 9 is provided at the bottom of each regular hexagonal channel 7 in the core. According to the position of the regular hexagonal channel 7 in the core, the layout of the core control rods and the three-dimensional power distribution shape of the core, the The coolant flow rate of each regular hexagonal channel 7 is adjusted.

[0043] According to the core power, height and other parameters, the fuel management method of 3 batches, 4 batches or 5 batches of refueling is adopted, that is, 3 boxes of regular hexagonal fuel assemblies and 4 boxes of regular hexagonal fuel assemblies are arranged in each regular hexagonal channel 7 of the core. For fuel assemblies or 5 boxes of regular hexagonal fuel assemblies, the coolant adopts a single-flow flow scheme, and the flow of coolant in each regular hexagonal channel...

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Abstract

The invention discloses a single-flow supercritical water cooled reactor based on regular hexagonal fuel assemblies. According to each regular hexagonal fuel assembly, a guide pipe is coaxially arranged at the center of the regular hexagon fuel assembly, and a control rod bundle is coaxially arranged in the guide pipe; supporting pipes are coaxially arranged at the hexagonal positions; a pluralityof fuel rods are coaxially arranged between the side edges and the center, and gaps between the adjacent fuel rods are taken as coolant flow channels. The single-flow supercritical water cooled reactor based on the regular hexagonal fuel assemblies comprises a plurality of regular hexagonal channels, the regular hexagonal channels are adjacent to one another to form a honeycomb integral structure, and a metal reflecting layer is arranged outside the honeycomb integral structure; and the regular hexagonal channels are used for loading the regular hexagonal fuel assemblies. With ensured economical benefit, safety and of various advanced technical indexes of the supercritical water-cooled reactor, the fuel assemblies and an in-reactor structure are greatly simplified, and the engineering realizability of the supercritical water-cooled reactor is remarkably improved.

Description

technical field [0001] The invention relates to the technical field of nuclear reactors, in particular to a single-flow supercritical water-cooled reactor based on regular hexagonal fuel assemblies. Background technique [0002] Supercritical water-cooled reactor (SCWR) is one of the six most promising nuclear energy systems selected by the Generation IV Nuclear Energy International Forum (GIF). SCWR is a high-temperature, high-pressure water-cooled reactor whose coolant outlet parameters are above the thermodynamic critical point of water. Compared with conventional pressurized water reactors, the thermal efficiency of SCWR can reach more than 45%, and it makes full use of the technical achievements of existing supercritical thermal power units. Due to the high water vapor parameters, the system can be greatly simplified by using direct circulation. SCWR has no DNB phenomenon, and the fuel cladding is made of stainless steel, which completely eliminates the potential risk...

Claims

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Application Information

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IPC IPC(8): G21C3/04G21C3/08G21C3/30
CPCG21C3/04G21C3/08G21C3/30Y02E30/30
Inventor 夏榜样李司南姚磊卢迪肖鹏甯忠豪王连杰李庆李翔李松蔚李文杰
Owner NUCLEAR POWER INSTITUTE OF CHINA
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