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Pebble Bed nuclear reactors are fourth generation reactors that has dramatic increases in safety, efficiency, and waste. The novelty of the reactors lies within the pyrolytic graphite balls, as pictured here. Each ball contains the nuclear materials and is essentially a mini reactor in itself. One of the major advantages to conventional nuclear reactors, however, is the pebble bed reactor is self regulating. Operators could literally walk away from the controls of the reactor and the reactor wouldn’t melt down. This is because the graphite balls, the cooling system, and the nuclear process act in a way to keep the heat capped. There is maximum temperature that it regulates at.
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Also, the reactor utilizes helium to circulate around the graphite “pebbles.” This is better than the conventional water cooling system. Helium doesn’t absorb radioactivity as readily as water does. This limits the radioactive pollution. Also, because the helium travels around the natural spaces in between the pebbles, there is no need for intricate piping. The standard water cooling system of conventional reactors accounts for a large amount of the cost.
Pebble Bed reactors are actively being pursued in China, South Africa, and the Netherlands. Time will tell if the super heated helium can turn those turbines effectively and safely.
Photo Source: Stefan Kühn, 2004
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If properly implemeted it can change the face of Technology.U can have watches that can run on nuclear cells.
Great Post