Image:Nuclear power defense in depth.png
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This diagram demonstrates the defense in depth quality of nuclear power plants. 1st layer of defense is the inert, ceramic quality of the uranium oxide itself. 2nd layer is the air tight zirkonium alloy of the fuel rod. 3rd layer is the reactor pressure vessel made of steel more than a dozen centimeters thick. 4th layer is the pressure resistant, air tight containment building. 5th layer is the reactor building or in newer powerplants a second outer containment building.
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