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4 Composition of gaseous atmosphere in the containment during corium-concrete interaction The purpose of this section is to describe the composition of gaseous mixtures that may be encountered in the various rooms in the containment during a severe accident. An accident scenario will be chosen for this purpose, and a sensitivity study will be carried out on the concrete type considering the two extreme cases identified in the previous sections. A type S2CD accident scenario was chosen for a 900 MWe PWR.

2 regardless of the type of concrete being studied; the amount of diluents added is greater than the amount of combustible material added, and globally the combustible material concentration in the containment reduces. 5 times more gas than a siliceous concrete while the interaction period between the corium concrete is only increased by one third. Table A-2 gives the order of magnitude of gas flows produced in the different phases and depending on the type of concrete. 4 Composition of gaseous atmosphere in the containment during corium-concrete interaction The purpose of this section is to describe the composition of gaseous mixtures that may be encountered in the various rooms in the containment during a severe accident.

33 NEA/CSNI/R(2000)10 100 20% Steam 20% Steam/5% CO 20% Steam/10% CO Detonation Cell Width (cm) 50 10 5 10 15 20 25 30 35 40 Hydrogen (%) Figure 10. 8 10 20 30 40 50 60 70 H2 + CO (%) Figure 11. 1 Introduction The gaseous compounds CO and CO2 are formed during the interaction between corium and concrete by the decomposition of carbonates contained in this concrete and the oxidation of metals present in corium. In general, the interaction between corium and concrete takes place in two steps: (a) A short-term phase lasting about a quarter of an hour immediately after penetration of the vessel.

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