Method of distribution and refuelling of core fual of light water type middle-small reactor

Abstract

A method for laying and changing material of reactor core fuel component on light water small power reactor includes setting reactor core in enclosed cylinder and dividing it to be central region and external region, laying fuel component in central region and setting idle component at external region when initial load is carried out, laying component unloaded from central region at external region to replace idle component when material of reactor core is changed, repeating said operation in following material change till burn up depth required by design is reached by unloaded component.

Description

technical field [0001] The invention relates to a method for distributing and refueling fuel components of a light-water type small and medium-sized power reactor core, and belongs to the technical field of nuclear reactors. Background technique [0002] In the design of light water reactors in nuclear power plants, the fission isotopic enrichment of fuel and the burnup depth of unloaded fuel are two important economic indicators. When the design power is determined, the fuel composition and the number of fuel assemblies are determined by the design requirements of reactor physics, thermal engineering and structure, and economical trade-offs. The design result of economical-scale nuclear power plants is that the fuel assemblies discharged at the end of the combustion period reach and approach the allowable burnup depth of this type of fuel assembly. [0003] With the improvement of fuel assembly development and processing, as well as the increase of fuel use experience and ...

AI Technical Summary

Problems solved by technology

[0007] The first method increases the unit price of fuel, increases the initial fuel cost and fuel replacement cost, but improves the total economic benefit due to the deepening of fuel consumption and the extension of the refueling cycle

The second method increases the cost of expanding the core structure due to the expansion of the diameter of the pressure vessel, the expansion of the hanging basket and the core structural parts, and also increases the cost of the initial fuel and the possible increase of control rods and driving mechanisms.

However, compared with economic-scale nuclear power plant reactors, small and medium-sized reactors have a much smaller core size, and the result of the design is that the fuel fission isotope enrichment degree is high, the burnup depth is shallow, and the fuel economy is poor.

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