Two phase countercurrent flow in reactor hot leg at loss of coolant accident is studied by experiment and analysis.

对反应堆失水事故条件下热管段内的两相流逆向流动过程进行了实验研究和理论分析。

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It is necessary to determine switchover time to simultaneous cold and hot leg safety injection during LOCA long-term core cooling.

在失水事故长期冷却过程中，必须确定安全注射系统从冷段注射切换到冷热段同时注射的切换时间。

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Cold leg recirculation mode will provide long term cooling for the core and hot leg recirculation mode will be used alternately provide reverse flow to the core.

冷段再循环给堆芯提供长期的冷却，热段再循环用于交替地给堆芯提供反向流。

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He scratches and scratches, biting at the hot spot on his leg, gnawing.

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