A method for dynamically controlling the circulation rate of fuel spheres in a pebble bed high temperature reactor

By leveraging the principle of energy conservation and the equivalent conversion of fuel enrichment, the fuel sphere circulation rate of the pebble bed high-temperature reactor is dynamically controlled. This solves the problem of fuel sphere ratio changes and enrichment replacement logic not being considered in existing technologies, thus achieving reactivity balance and improved fuel utilization efficiency.

CN122158215APending Publication Date: 2026-06-05HUANENG POWER INT INC +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HUANENG POWER INT INC
Filing Date
2025-12-04
Publication Date
2026-06-05

AI Technical Summary

Technical Problem

Existing methods for determining the fuel cycle rate of pebble bed high-temperature reactors fail to effectively consider the changes in the proportion of fuel pebbles and the logic of enrichment replacement at different operating stages, leading to deviations in reactivity calculations, affecting core burnup uniformity and helium cooling efficiency, and increasing fuel management costs.

Method used

Based on the principle of energy conservation and the equivalent conversion of fuel enrichment, the fuel sphere circulation rate is dynamically controlled by calculating the baseline fuel sphere circulation rate, stage characteristic adjustment coefficient, and power level dynamic correction, thereby achieving reactivity balance and improving fuel utilization efficiency.

Benefits of technology

It enables precise control of the fuel ball circulation rate of the pebble bed reactor under different operating stages and power levels, thereby improving the core operation stability and fuel utilization efficiency.

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Abstract

The application discloses a kind of ball bed type high temperature reactor fuel ball circulation rate dynamic control methods, it is related to ball bed type high temperature reactor fuel circulation rate calculation technical field, wherein method includes: obtaining the daily 235U mass addition reference value under the rated power state of reactor, and the corresponding reference fuel ball circulation rate is calculated based on fuel ball enrichment and equivalent replacement rule;According to the fuel ball proportion characteristic parameter of current operating stage, the ratio relationship of fuel ball recirculation and replacement is determined, and the stage characteristic adjustment coefficient is generated;Combining the stage characteristic adjustment coefficient with reference fuel ball circulation rate, the fuel ball circulation rate of target operating stage is calculated;Based on the ratio of actual operating power and rated power, the fuel ball circulation rate of target operating stage is power level dynamically corrected by energy conservation principle.The application embodiment can realize the accurate control of reactivity balance, improve the stability of reactor core operation and fuel utilization efficiency.
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