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Pressurized water reactor core refueling long-period fuel management method and application

A fuel management and refueling cycle technology, applied in the direction of reactor fuel elements, reactors, and greenhouse gas reduction, can solve the problems of high cost, low economy, and inability to be widely used, and achieve wide application, good fuel economy, and The effect of improving fuel economy

Pending Publication Date: 2022-04-01
NUCLEAR POWER INSTITUTE OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing PWR core refueling long-period fuel management method has high cost and low economy, which leads to the fact that the long-period refueling method cannot be widely used for large-scale nuclear power plant PWR cores

Method used

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  • Pressurized water reactor core refueling long-period fuel management method and application
  • Pressurized water reactor core refueling long-period fuel management method and application
  • Pressurized water reactor core refueling long-period fuel management method and application

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Embodiment 1

[0035] This embodiment is aimed at a reactor core of a one-million-kilowatt nuclear power plant, and the core is composed of 157 fuel assemblies. The core is cooled and moderated with light water, which contains soluble boron.

[0036] In this scheme, 72 new fuel assemblies with an enrichment degree of 5.95% are installed in each cycle and arranged inside the core. The outermost circle of the core is placed with old fuel assemblies that have been burned up for several cycles, and the old fuel assemblies with shallow burnup that have been burned up in the inner circle of the core are placed crosswise with new fuel assemblies to form an extremely low-leakage loading method.

[0037] Each new fuel assembly is arranged in a 17×17 array, containing 264 fuel rods, 24 guide tubes and an in-stack instrumentation tube. Solid burnable poison using gadolinium, UO 2 -Gd 2 o 3 The enrichment degree of U-235 in fuel pellets is 2.5%, Gd 2 o 3 The weight percentage is 10%. Typical numb...

Embodiment 2

[0042] This embodiment is aimed at a reactor core of a 600,000-kilowatt nuclear power plant, which is composed of 121 fuel assemblies. The core is cooled and moderated with light water, which contains soluble boron.

[0043]In this scheme, 56 new fuel assemblies with an enrichment degree of 5.45% are loaded into each cycle and arranged inside the core. The outermost ring of the core houses old fuel assemblies that have been burned up for many cycles. Old fuel assemblies with shallow burnup that have been burnt up in the inner ring of the core are placed crosswise with new fuel assemblies to form an extremely low-leakage loading method.

[0044] Each new fuel assembly is arranged in a 17×17 array, containing 264 fuel rods, 24 guide tubes and an in-stack instrumentation tube. Solid burnable poison using gadolinium, UO 2 -Gd 2 o 3 The enrichment degree of U-235 in fuel pellets is 2.5%, Gd 2 o 3 The weight percentage is 10%. Typical numbers of gadolinium-loaded fuel rods i...

Embodiment 3

[0050] This embodiment is aimed at the reactor core of a mega-kilowatt nuclear power plant, which consists of 177 fuel assemblies. The core is cooled and moderated with light water, which contains soluble boron.

[0051] This scheme loads 80 new fuel assemblies per cycle, of which the new fuel assemblies include two kinds of enrichment degrees, which are 5.45% and 5.95% respectively, and there are 4 new fuel assemblies with the enrichment degree of 5.45%, and the enrichment degree is 5.95% The % of new fuel assemblies is 76, and the new fuel assemblies are arranged inside the core. The outermost ring of the core houses old fuel assemblies that have been burned up for many cycles. Old fuel assemblies with shallow burnup that have been burnt up in the inner ring of the core are placed crosswise with new fuel assemblies to form an extremely low-leakage loading method.

[0052] Each new fuel assembly is arranged in a 17×17 array, containing 264 fuel rods, 24 guide tubes and an i...

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Abstract

The invention discloses a pressurized water reactor core refueling long-period fuel management method which is characterized in that new fuel assemblies with the enrichment degree exceeding 5% are adopted for refueling each time in a balance cycle, and the number of the new fuel assemblies for refueling each time is smaller than or equal to 1 / 2 of the number of reactor core assemblies; and the balance cycle is a 24-month refueling cycle. New fuel assemblies with the enrichment degree exceeding 5% are adopted for refueling, and the number of refueling assemblies each time does not exceed 1 / 2 of the number of reactor core assemblies, so that the fuel economy can be effectively improved, and a fuel management method with a 24-month refueling cycle and good fuel economy is realized; and wide application of 24-month refueling modes for various types of pressurized water reactors of large nuclear power plants is realized.

Description

technical field [0001] The invention relates to the technical field of pressurized water reactor nuclear power plant reactors, in particular to a long-period fuel management method and application of pressurized water reactor core refueling. Background technique [0002] Nuclear pressurized water reactor core fuel management generally refers to determining the fuel enrichment degree used in the core, the type of burnable poison, and the arrangement of various components and poison in the core from the first cycle to the balance cycle core, so that The design results of the PWR 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] At present, the mainstream cycle length of nuclear power plants in service around the world is about 18 months. In the United States, there are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G21C19/20
CPCY02E30/30
Inventor 陈亮刘同先王晨琳周金满刘晓黎李向阳李天涯肖鹏廖鸿宽彭星杰陈长蒋朱敏蔡云钟旻霄
Owner NUCLEAR POWER INSTITUTE OF CHINA