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为研究事故时非能动安全壳外部下降段对堆芯余热排出的影响,建立简化的安全壳外部结构计算模型并进行数值计算,获得自然力作用下的安全壳外部冷却循环特性。讨论下降段、导流板和上升段之间的耦合换热特点,分析下降段宽度对安全壳外部冷却的影响。研究表明,当竖直部分较高时不宜略去下降段。
In order to study the influence of the external descending section of the passive containment on the core residual heat emission during the accident, a simplified computational model of the external structure of the containment was established and numerically calculated to obtain the external cooling cycle characteristics of the containment under natural forces. The characteristics of the coupled heat transfer between the descending section, the baffle and the ascending section are discussed. The influence of the descending section width on the external cooling of the containment is analyzed. Research shows that it is not advisable to omit the descending section when the vertical part is high.