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Título : Modelling of HTR Confinement Behaviour during Accidents Involving Breach of the Helium Pressure Boundary
Autor : Fontanet, Joan
Herranz, Luis E.
Ramlakan, Alastair
Naicker, Lolan
Palabras clave : HTR
Accident analysis
Simulation
ASTEC
CONTAIN
Thermal-hydraulics
Aerosols
Fecha de publicación : ago-2009
Editorial : Science and Technology of Nuclear Installations
Citación : Science and Technology of Nuclear Installations. Volume 2009, Article ID 687634, 11 pages
Resumen : Development of HTRs requires the performance of a thorough safety study, which includes accident analyses. Confinement building performance is a key element of the system since the behaviour of aerosol and attached fission products within the building is of an utmost relevance in terms of the potential source term to the environment. This paper explores the available simulation capabilities (ASTEC and CONTAIN codes) and illustrates the performance of a postulated HTR vented confinement under prototypical accident conditions by a scoping study based on two accident sequences characterized by Helium Pressure Boundary breaches, a small and a large break. The results obtained indicate that both codes predict very similar thermal-hydraulic responses of the confinement both in magnitude and timing. As for the aerosol behaviour, both codes predict that most of the inventory coming into the confinement is eventually depleted on the walls and only about 1% of the aerosol dust is released to the environment. The cross-comparison of codes states that largest differences are in the inter-compartmental flows and the in-compartment gas composition.
URI : http://documenta.ciemat.es/handle/123456789/5182
ISSN : 1687-6075
DOI: 10.1155/2009/687634
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