我想要着重在沸水反应堆，也压水式反应堆。
And I wanna focus in on the boiling water reactor and the pressurised water reactor.
在一个压水式反应堆里，我们用硼来控制反应率。
Now in a PWR we have essentially boron to control reactivity.
现在，我们回顾一下沸水式反应堆，我们会做一个压水式反应堆。
Now let me go over boiling water reactors and then we'll do pressurised water reactors.
现在，两种在美国很普遍的类型，是压水式反应堆和沸水式反应堆。
Now the two types that are common in the United States are the pressurised water and the boiling water.
在压水式反应堆中，水的压力则是，2000磅，这避免了水在核心处沸腾。
In a PWR the pressure of the water is about two thousand pounds which prevents boiling in the core.
在压水式反应堆里，热水在高压下通过钢管循环，金属离子不断从管壁上溶解到水中。
In a pressurised-water reactor, hot water circulates at high pressure through steel piping, dissolving metal ions from the walls of the pipes.
在反应堆安全中，他们观察可能产生问题的，事件，初始的事件在压水式反应堆的领域里。
In reactor safety they look events that can create problems, initiating events in PRA world.
这些图片现在很难得到,由于911事件，现在压水式反应堆,是不同的，这是它的原理图。
These pictures are hard to come by these days because of 9/11. Now pressurised water reactors are different and this is the schematic of a PWR.
这一个是很熟悉的，增压安全阀的疏忽打开，或者是在压水式反应堆的减压阀，或者是在沸水式反应堆的安全阀。
This one is the familiar one, inadvertent opening of a pressurised safety or relief valve in a PWR or a safety valve in a BWR.
你们也会注意到在压水式反应堆里有，3个不同的冷却系统，主要的，第二个，还有第三个系统，那是系统，会真的进入到环境中去。
And you'll also note in a PWR we have three different cooling systems; the primary, the secondary and the third system which is the system that actually goes into the environment.
这是个沸水式反应堆和压水式反应堆的，设计上的重要区别，沸水型反应堆的燃料组件，是罐装起来确保我们得到，的冷水的供应足够。
This is a very important design difference between a BWR and a PWR. So, BWR fuel assemblies are essentially canned to make sure we have an adequate supply of cooling water.
这是个沸水式反应堆和压水式反应堆的，设计上的重要区别，沸水型反应堆的燃料组件，是罐装起来确保我们得到，的冷水的供应足够。
This is a very important design difference between a BWR and a PWR. So, BWR fuel assemblies are essentially canned to make sure we have an adequate supply of cooling water.
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