Chyba siÄ wyjasniĹo. PoniĹźej cytat z
Applied Catalysis B: Environmental 47 (2004) 47â58
"Catalytic combustion of hydrogen for mitigating hydrogen risk
in case of a severe accident in a nuclear power plant: study of
catalysts poisoning in a representative atmosphere"
Franck Morfin, Jean-Christophe Sabroux, Albert Renouprez
"Nevertheless, overheating of the reactor core above
1200 C in the presence of steam can induce a runaway
oxidation of the zircaloy (an alloy of zirconium and tin)
composing the fuel cladding. The 29,660 kg of zircaloy
present in the pressure vessel of a French 1400MWe PWR
could yield a mean 18.2% H2 in a dry atmosphere [5]. Indeed,
a large amount of energy is produced by this exothermic
oxidation, raising the temperature and resulting in a
self-acceleration of the in-vessel core melt down:
Zr + 2H2O(vap) â ZrO2 + 2H2,
dH = â617 kJ/mol
Up to 15,000m3 STP of hydrogen can be released within
a few hours during this critical step, including the destruction
of the core support structure and control rods, creating,
together with the melted fuel rods, the so-called corium
slumping down into the lower head of the pressure vessel"
W skrĂłcie - nastÄpuje zniszczenie struktury prÄtĂłw paliwowych i
wymieszanie caĹego tego bajzlu, wiÄc zaĹoĹźenie o dostÄpnoĹci tylko Zr
z powierzchni byĹo bĹÄdne. To chyba wyjaĹnia sprawÄ.
Pozdrawiam,
kk
Received on Fri Mar 25 11:23:25 2011
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