下午3点30，刚刚在东京电力公司宣布排气之后，一号反应堆发生爆炸，起因是堆芯产生的大量氢气。
At around 3:30 p.m., shortly after TEPCO announced the venting, an explosion rocked reactor number 1. This is thought to have been caused by hydrogen from the core.
高位点的排气口和低位点的排水口是用于系统完全的充填和排水。
High point vents and low point drains are desirable for complete filling and draining of systems.
在分配系统中没有安装高位点的排气口，可采用高流速以及流速限制技术以确保系统的完全充填。
In distribution systems where high point vents are not installed, high velocity flow and flow restriction techniques can be used to ensure complete filling of the system.
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