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I recall that hydrogen is produced by the thermal decomposition of the zirconium rods. This might indicate that there is concern over the ability to maintain even the existing reduced water levels around the rods in the reactors. If they can prevent hydrogen explosions inside the containment vessel that would be good. Venting a mix of hydrogen and nitrogen should be much less vulnerable to immediate explosion than just venting hydrogen into a norma oxygen/nitrogen atmosphere.

"It is not necessary to have hope in order to persevere."
by ARGeezer (ARGeezer a in a circle eurotrib daught com) on Fri Apr 1st, 2011 at 11:38:47 AM EST
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