Abstract
Gaseous hydrogen may be generated in a nuclear reactor system as an effect
of the core overheating. This creates a risk of its uncontrolled
combustion which may have a destructive consequences, as it could be
observed during the Fukushima nuclear power plant accident. Favorable
conditions for hydrogen production occur during heavy loss-of-coolant
accidents. The author used an own computer code, called HEPCAL, of the
lumped parameter type to realize a set of simulations of a large scale
loss-of-coolant accidents scenarios within containment of second
generation pressurized water reactor. Some simulations resulted in high
pressure peaks, seemed to be irrational. A more detailed analysis and
comparison with Three Mile Island and Fukushima accidents consequences
allowed for withdrawing interesting conclusions.
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