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Lead-based fast reactor magnesium oxide reflecting layer assembly and lead-bismuth fast spectrum reactor core arrangement

A core layout, magnesium oxide technology, applied in the direction of moderator/core structure, reactor fuel elements, reactors, etc., can solve the problems of limited improvement of neutron utilization rate, general neutron reflection ability, etc. Significant effect of sub-utilization, operating cycle, and significant improvement

Pending Publication Date: 2021-11-19
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The neutron reflection ability of this type of component is average, and the improvement of neutron utilization is limited

Method used

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  • Lead-based fast reactor magnesium oxide reflecting layer assembly and lead-bismuth fast spectrum reactor core arrangement
  • Lead-based fast reactor magnesium oxide reflecting layer assembly and lead-bismuth fast spectrum reactor core arrangement
  • Lead-based fast reactor magnesium oxide reflecting layer assembly and lead-bismuth fast spectrum reactor core arrangement

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Experimental program
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Effect test

Embodiment 1

[0039] Such as figure 1 and figure 2 As shown in the 7-rod magnesium oxide reflective layer assembly, the assembly box 3 is a columnar structure with a hexagonal cross-section, that is, a hexagonal prism tubular structure, and a cylindrical enclosure 1 is placed inside the assembly box 3 along the axial direction, and the enclosure 1 Inside is magnesium oxide 2, and the gap between component box 3 and cladding 1 is all coolant 4;

[0040] The cladding 1 and the inner magnesium oxide 2 together form a reflector rod. The cladding 1 is cylindrical, so a cylindrical reflector channel is formed. In this embodiment, there are 7 reflector rods. According to the position of the center of the cross section, uniform distributed in a hexagonal cross-section. Among them, the cross-section center of the middle reflector rod coincides with the center of the hexagonal cross-section, and the remaining six reflector rods are evenly distributed around the outer circle of the central reflecto...

Embodiment 2

[0045] Different from Embodiment 1, the magnesium oxide 2 , the coolant 4 and the casing 1 have another arrangement in the component box 3 .

[0046] Such as image 3 and Figure 4 As shown, the component box 3 is also a columnar structure with a hexagonal cross-section, that is, a hexagonal prism tubular structure. The cylindrical casing 1 is placed inside the component box 3 along the axial direction, and the number of the casings 1 satisfies all the above three requirements. The distances between the centers of the cross-sections of two adjacent shells 1 are all equal, the center of the cross-section of the shell 1 at the center coincides with the center of the cross-section of the component box 3, and the number of shells 1 is 7, 19, 37, etc.

[0047] The difference is that the interior of the cladding 1 is a circulation channel for the coolant 4, and the gap between the cladding 1 and the component box 3 is magnesium oxide 2;

[0048] In this embodiment, the number of c...

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Abstract

The invention belongs to a nuclear reactor design technology, and particularly relates to a magnesium oxide reflecting layer assembly and reactor core arrangement for a lead-based fast reactor. The reflecting layer assembly comprises an assembly box, jackets, magnesium oxide and a coolant, wherein the jackets are evenly arranged in the axial direction, the central jacket coincides with the circle center of the section of the assembly box, the rest jackets are evenly distributed in the hexagonal section of the assembly box, the circle centers of the sections of the adjacent jackets are equidistant, the reflecting layer assembly is arranged on the periphery of a reactor core active area, a control rod assembly is arranged in the center of the reactor core active area, hexagonal fuel assemblies with enrichment degrees from low to high are uniformly arranged in two layers around the control rod assembly from inside to outside according to the hexagon of the cross section, and the rest of the control rod assemblies are uniformly arranged in the fuel assemblies with one enrichment degree. According to the invention, the operation cycle of the lead-based fast reactor is obviously prolonged, a large number of neutrons overflowing out of the reactor core can be reflected back to the reactor core, the neutron utilization rate is increased, and the operation cycle of the lead-based fast reactor is prolonged.

Description

technical field [0001] The invention belongs to the nuclear reactor design technology, and in particular relates to a magnesium oxide reflective layer assembly and core layout for a lead-based fast reactor. Background technique [0002] Lead-based fast-spectrum reactors use lead or lead-bismuth alloys as coolants. Lead or lead-bismuth alloys have the characteristics of weak neutron moderation, strong thermal conductivity, and stable chemical properties, which make lead-based fast-spectrum reactors have excellent neutron physics. , thermal hydraulics, and system safety properties, and has been selected as the "fourth generation" advanced nuclear energy system recognized by the international mainstream nuclear energy industry. [0003] Compared with pressurized water reactors, fast reactors have a higher neutron leakage rate. In order to reduce leakage and increase the operating cycle of the reactor, a large number of radial reflector assemblies are generally arranged around t...

Claims

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Application Information

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IPC IPC(8): G21C7/28G21C11/06G21C3/326G21C3/328G21C5/14G21C5/16
CPCG21C7/28G21C11/06G21C3/326G21C3/328G21C5/14G21C5/16Y02E30/30
Inventor 彭星杰吉文浩王连杰卢迪蔡云向宏志张斌王冬勇郭锐孙伟夏榜样于颖锐严明宇余红星
Owner NUCLEAR POWER INSTITUTE OF CHINA
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