Rachel Maddow in the first 6 minutes and 30 seconds of this clip gives a pretty decent explanation of how a nuclear power plant works and what steps are taken if a nuclear emergency, such as the type that is now going on at several facilities in Japan, develops. Her guest from the Union of Concerned Scientists doesn't add much, but Maddow's presentation is informative.
You can take this article for what you will, but it sounds like what the nuclear industry wants you to believe -- it certainly *sounds* impressive:
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