基于包覆燃料的气冷快堆堆芯核设计

Core Nuclear Design for Gas Cooled Fast Reactor Based on a Novel Type of Fuel Dispersion with Coated Fuel Particles

针对包覆颗粒弥散体核燃料用于气冷快堆时存在的燃料装载量低和能谱软化问题,本文提出了一种使用双层包覆颗粒、以ZrSi 2为基体材料的新型弥散体燃料模型,给出了棒状和块状的气冷快堆堆芯布置方案,并用蒙特卡罗程序模拟计算了堆芯中子学参数。计算结果表明:堆芯的能谱未见明显软化,满足气冷快堆的能谱要求,验证了新型弥散体燃料在气冷快堆中的适用性;堆芯具有充足的剩余反应性和安全裕度,通过调节控制组件,可以安全地启动、运行和停堆,堆芯燃料可以达到较高的燃耗深度,验证了堆芯设计方案的合理性。

To solve the problem of low fuel loading and energy spectrum softening of coated particles dispersion fuel applied to gas cooled fast reactor(GFR),a new dispersion fuel model using bi-layer coated particles and ZrSi 2 as matrix material is proposed.The core layout schemes of the pin-type fuel and the block-type fuel are given,and the neutron parameters of the core are simulated by Monte Carlo program.Calculation results show that the energy spectrum softening of designed cores is accepted,which gives evidence to the feasibility of the application of fuel particles dispersion to GFR.Sufficient excess reactivity and safety margin is ensured and control rods make the cores under safe start,operation and shutting down state.Deep burn-up has been achieved and the rationality of the GFR core design is verified.