Study on Effect of Flow Blockage at Inlet of Plate-type Fuel Element on Thermal-Hydraulic Characteristics of Reactor Core
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摘要: 应用多维堆芯物理与热工水力耦合程序PORSTA,充分考虑堆芯局部热工水力与中子动力学间的反馈效应,更贴近实际地模拟板型燃料元件堆芯的堵流状态,研究局部堵塞对堆芯热工水力特性的影响。结果表明:局部堵塞会引起强烈的堆芯局部热工水力和中子物理间的反馈效应,堵塞通道内将引入显著负反应性,功率下降;同时由于冷却剂流量减小,冷却条件恶化,通道内燃料中心温度、包壳表面温度以及冷却剂平均温度显著上升。堵塞局部亦将对全堆芯的热工水力特性产生影响。Abstract: This paper simulated the local flow blockage accident of reactor core made up of plate-type fuel with more detailed consideration of local feedback effect between thermal-hydraulics and neutron kinetics, which will help the analysis of the effect of blockage on the reactor thermal-hydraulic characteristics more practically. The simulation shows that the local blockage will cause strong feedback between neutron kinetics and thermal-hydraulics, which will lead to power decrease in the blocked channel. The fuel centreline temperature, the cladding surface temperature and the coolant average temperature will increase due to the deterioration of cooling in the blocked channel.
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