熔盐堆单参数扰动瞬态特性分析

熔盐堆（MSR）作为一种新型的反应堆，其热工水力特性与其他堆型有很大差异，扰动瞬态分析有助于从根本上了解其安全特性和运行状态。为了研究MSR的运行瞬态特性，本研究以液态燃料MSR为研究对象，利用经过修改的RELAP5/ MOD4.0程序进行了稳态运行工况下的扰动瞬态分析。干扰变量包括反应性引入、一回路熔盐质量流量、二回路质量流量、空气散热器质量流量、空气散热器入口空气温度。分析了主要运行参数，如功率、堆芯进出口温度、二回路进出口温度、特征时间等。结果表明MSR在各种扰动瞬态下的最终状态都趋于稳定，而不存在严重的瞬态变化，这是对其固有稳定性特性的直观表征。根据功率和温度等变量在扰动下的变化，提出了功率和不同回路温度的控制方法。 

Transient Characteristics Analysis of Single Parameter Disturbance in Molten Salt Reactor

As an innovative reactor, the thermal-hydraulic characteristics of molten salt reactor are very different from other reactors. Disturbance transient analysis helps to fundamentally understand its safety characteristics and operating conditions. In order to study the transient characteristics of molten salt reactor operation, this study takes liquid fuel molten salt reactor (MSR) as the research object, and uses the modified RELAP5/MOD4.0 program to carry out disturbance transient analysis under steady-state operation conditions. Disturbance variables include mass flow rate of primary circuit, mass flow rate of secondary circuit, mass flow rate of air radiator and inlet air temperature of air radiator. Main operating parameters, such as power, core inlet and outlet temperature, secondary circuit inlet and outlet temperature, and characteristic time, are analyzed. The results show that the final state of the MSR under various disturbance transients tends to be stable without severe transient changes, which is an intuitive characterization of its inherent stability characteristics. According to the change of power and temperature under disturbance, the control method of power and different circuit temperature is proposed.