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本文用集中参数法导出反应堆紧急停闭时燃料元件释热率对时间变化的函数关系,在此基础上对其影响因素作一些初步分析。对反应堆事故作热工分析,需检验事故过程中燃料元件的热负荷、载热剂焓值及燃料元件温度的变化;应急冷却系统的设计需知道载热剂从堆内带出热量的速率。这些都与单位长度的燃料元件,单位时间内向载热剂释放的热量有密切关系。燃料元件释热率(q_L)就是单位长度的燃料元件,单位时间内向载热剂释放的热量。反应堆发生重大事故时,均实行紧急停闭,这种情况下,燃料元件释热率是一个随时间变化的量,找出它们的函数关系,便于对反应堆事故,例如失水事故、载热剂泵断电事故等进行理论分析,也便于研究停堆后的冷却问题。
In this paper, we derive the function of the fuel element heat release rate as a function of time when the reactor is shut down urgently by using the centralized parameter method. Based on this, some influencing factors are analyzed. The thermal analysis of reactor accidents needs to check the thermal load, the enthalpy of the enthalpy and the temperature of the fuel element during the accident. The design of the emergency cooling system needs to know the rate at which the entrained heat carries the heat from the reactor. These are closely related to the unit length of the fuel element, the heat released to the heat-generating agent per unit of time. The fuel element heat release rate (q_L) is the unit length of the fuel element, the heat released to the heat unit per unit of time. In the event of a major accident in a reactor, an emergency shutdown is carried out. In this case, the heat release rate of the fuel element is a function of time and its function is found out and it is easy to react to a reactor accident such as a water loss accident, Pump power failure and other theoretical analysis, but also easy to study after the shutdown cooling problem.