CO-H Combustion Chars in Severe Accident Cond

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Diluent concentration − In general, the concentration of carbon dioxide per unit volume in the atmosphere in the various compartments is less than 1%, which is normal considering the quantities released for this type of concrete. For this scenario, the ratio between concentrations of steam and carbon dioxide per unit volume is always greater than 20. − The concentration of steam in the reactor pit reaches a value of 42% by volume roughly in the middle of the corium-concrete interaction high-temperature phase.

Combustible material concentrations are approximately identical for these volumes which show the beneficial mixing due to the corium-concrete interaction and the lack of a stable and long-term stratification in the containment of a French 900 MWe PWR for this type of scenario. − The ratio between the concentrations per unit volume of hydrogen and carbon monoxide vary between 2 at the beginning of the corium-concrete interaction long-term phase (75,000 s) and almost 1 at the end of the calculation.

1. The following observations can be made: − On average, during the high-temperature phase of the corium concrete interaction, the atmosphere in the reactor pit (R140) contains about 45% of combustible gas by volume (mostly carbon monoxide). − Large variations are smoothed considerably in the bottom room of the reactor coolant pump (R311) and in the dome (R800). Combustible material concentrations are approximately identical for these volumes which show the beneficial mixing due to the corium-concrete interaction and the lack of a stable and long-term stratification in the containment of a French 900 MWe PWR for this type of scenario.

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