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A long cycle refueling loading method for super large pressurized water reactor core

A pressurized water reactor, ultra-large technology, applied in the field of nuclear power, to achieve the effect of improving neutron economy, reducing cost, improving safety and fuel economy

Active Publication Date: 2021-08-17
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a super-large pressurized water reactor core long-cycle refueling loading method to solve the problem of how to reduce the negative impact brought by the corresponding parameter adjustment on the basis of improving the economic efficiency of the power plant

Method used

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  • A long cycle refueling loading method for super large pressurized water reactor core
  • A long cycle refueling loading method for super large pressurized water reactor core
  • A long cycle refueling loading method for super large pressurized water reactor core

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Embodiment 1

[0037] Such as Figure 1-Figure 5 Shown, the present invention provides a kind of ultra-large pressurized water reactor core long cycle refueling loading method, comprises the following steps:

[0038] 1) The high-leakage loading mode is adopted for the first cycle core, and a total of 221 sets of fuel assemblies are loaded into the core. The fuel assemblies adopt 3 to 6 different enrichment degrees, and the U-235 enrichment degrees of the fuel assemblies are distributed between 1.6% and 4.0%, wherein the components with the highest enrichment degree are arranged at the outermost circle of the core, and the fuel assemblies with lower enrichment degrees are arranged in a cross checkerboard pattern inside the core. The height of the active section of the fuel rod is 14 feet, and the fuel assembly is partitioned in the axial direction according to the needs, that is, no burnable poison is installed at the end, and fuel with a lower enrichment degree is used as the case may be, so...

Embodiment 2

[0046] This example illustrates the total number of new components in the transition cycle and the balance cycle.

[0047] The invention relates to a super-large pressurized water reactor core long-cycle refueling and loading method. The total number of new components in the transition cycle and the balance cycle is between 80 groups and 116 groups.

[0048] The length of the core maneuvering cycle can be adjusted by adjusting the number of new components with a certain number of new components and only adjusting the ratio of the new components of the two enrichments. For example, the total number of new components is 100, and the components of the two enrichments are 80 and 20 respectively; The length of the core maneuvering cycle is adjusted by adding or subtracting the total number of new components in the core, for example, increasing the number of new components from 80 to 116, so that the core can achieve a wider range of maneuvering operations and stronger maneuverabilit...

Embodiment 3

[0050] Lay out the fuel assemblies using a 17×17 grid.

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Abstract

The invention discloses a super-large pressurized water reactor core long-cycle refueling loading method. The whole core adopts 221 groups of fuel assemblies, the height of the active section of the core is 14 feet, the thermal power is not less than 4588MWt, and 80 fuel assemblies are added each time. ~116 new fuel assemblies. The enrichment ratio of the new fuel assembly can be flexibly adjusted according to the specific requirements of the cycle length, and the adjustment range of not less than 55EFPD can be realized. By adding or removing the new fuel assembly, an additional motor cycle of about ±30EFPD can be realized. The number of gadolinium fuel rods carried by the new fuel assembly and the mass fraction of gadolinium can be determined according to the need to flatten the power distribution of the core. The axial partition of the new fuel assembly can be set according to the changing characteristics of the axial power distribution of the core. The method can meet the needs of nuclear power plants transitioning to 18-24 months long-cycle fuel management, can increase power generation, reduce power plant specific investment, suppress core axial power oscillation, and improve core axial safety characteristics.

Description

technical field [0001] The invention belongs to the technical field of nuclear power, and in particular relates to a super-large pressurized water reactor core long-cycle refueling loading method. Background technique [0002] PWR core fuel management refers to determining the fuel enrichment degree used in the core, the type of burnable poison, and the arrangement of various fuel components and burnable poison in the core from the first cycle to the balance cycle core, so that The design results of the reactor core meet the nuclear design criteria and the general requirements of the power plant. The quality of core fuel management directly affects the economy and safety of nuclear power plants, and is the basis for subsequent safety analysis or evaluation. [0003] Currently, PWRs with electric power greater than 1400MWe are collectively referred to as super-large reactors in the world. Considering the efficiency of power plants, super-large reactors correspond to pressuri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G21C19/20
CPCG21C19/205Y02E30/30
Inventor 王晨琳崔怀明李向阳周金满吉文浩陈长陈亮王诗倩蒋朱敏巨海涛于颖锐黄世恩
Owner NUCLEAR POWER INSTITUTE OF CHINA
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