一种功率500MW模块化小型堆使用环形燃料实现15个月循环的换料方法及堆芯
By employing partitioned loading and low-leakage refueling methods in modular small modular reactors, the enrichment and arrangement of annular fuel assemblies were optimized, solving the problems of low thermal power output and short lifespan of annular fuel cores. This resulted in a thermal power output of 500MW and a cycle life of 15 months, improving both economic efficiency and safety.
CN120878303BActive Publication Date: 2026-07-17CHINA NUCLEAR POWER ENGINEERING CO LTD
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA NUCLEAR POWER ENGINEERING CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-07-17
AI Technical Summary
Technical Problem
When using annular fuel in modular small modular reactors, the core output thermal power is lower, the core life is shortened, the economic efficiency is poor, and it is difficult to achieve a 15-month refueling cycle.
Method used
It employs 57 annular fuel assemblies, loaded with fuel assemblies of different enrichment in three zones, and uses a low-leakage refueling method for cycle management, including initial cycle, transition cycle and balance cycle, to control the number and enrichment of combustible poison rods and optimize the arrangement of fuel assemblies.
Benefits of technology
This achieved a 30% increase in core output thermal power, reaching 500MW, and a cycle life of 15 months, improving the core's economy and safety and meeting design criteria requirements.
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Figure CN120878303B_ABST
Abstract
本发明公开一种功率500MW模块化小型堆使用环形燃料实现15个月循环的换料方法及堆芯，堆芯包括57组环形燃料组件首循环将组件分三个区装载，三个区的组件的富集度分别为2.4％、4.1％和4.25％，数量分别为17、20和20组；第二、第三循环卸出20组旧燃料组件，装入20组新的环形燃料组件，第四至第六循环卸出24组旧燃料组件，装入24组新的环形燃料组件；第七循环达到平衡循环，卸出24组旧燃料组件，装入24组新的环形燃料组件。本发明可保证由57组燃料组件组成的模块化小型堆在采用环形燃料组件后，输出热功率相比于采用棒状燃料组件时提高30％左右，达到500MW，平衡循环寿期长度达到15个月。
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