高温气冷堆温度反馈的集总参数法模拟

Lumped-parameter simulation of the temperature feedback in a high temperature gas-cooled reactor

该文研究了模块式高温气冷堆的堆芯热工反馈模型。在三维圆柱几何堆芯中子时空动力学改进准静态方法的基础上,应用集总参数法建立了模块式高温气冷堆堆芯温度反馈的热工模型。将全堆划分为燃料颗粒、等效慢化剂和反射层3个区域,通过热工反馈求解反应性变化。在反应性扰动和冷却剂丧失情况下,模拟了反应性、堆内各区温度、各能群中子平均注量率以及相对功率等物理量随时间的变化。模拟结果与理论分析一致,初步实现了高温气冷堆的物理热工耦合。

A core pyrology feedback model for the modular high temperature gas-cooled reactor （HTGR） is investigated. This paper uses a quasi-static, 3-D cylindrical model of the reactor core neutron kinetics in a lumped-parameter analysis in a core temperature feedback model for the HTGR. The core is divided into 3 regions. The variation of the core reactivity is coupled to the temperature coefficient. The reactivity variations during a loss of coolant accident are calculated based on the reactivity variations, the temperatures of each region, the average neutron flux in each group, and the relative power variation with time. The simulations agree well with a theoretical analysis to verity the HTGR coupling and the thermo-hydraulies feedback.