Moving to passive designs
For months, and perhaps years, lessons will be learned from the events at the Fukushima Daiichi nuclear power plant in Japan, which will serve as both a laboratory and a classroom. As the sequence of events leading to the accident continued through the accident response, at least one concept was made clear: When operating reactors, defense-in-depth -- the technical concept of multiple layers of safety backup systems -- must incorporate a series of active backup systems (meaning that they require human intervention) that must be operable to forestall single-point catastrophic failures.
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