An Experimental Study on Dryout Heat Flux in Particulate Bed Packed with Irregular Particles
2011 (English)In: Proceedings of the 2011 international congress on advances in nuclear power plants: ICAPP2011, American Nuclear Society, 2011Conference paper (Refereed)
This paper is concerned with reducing uncertainty in quantification of debris bed coolability in ahypothetical severe accident of light water reactors (LWRs), when the molten corium is relocatedinto a water pool, fragmenting and forming a particulate debris bed on the pool bottom.The test facility POMECO-HT at KTH is employed to investigate the coolability of particulatebeds which have some characteristics of a prototypical debris bed, such as packed with particlesof multiple sizes and irregular shapes. The facility features a high power capacity (up to 2.1MW/m2) which enables to obtain the dryout heat flux of a particulate bed formed by the DEFORparticles [1-2] for top-flooding and bottom-injection schemes. The particulate beds are chosen insuch a way that some characteristics of debris bed prototypicality analyzed in our previous study can be reflected, so that the data can be used to confirm the previous analysis results. Threeparticulate beds, named Bed-1 through Bed-3, were employed in the present study to obtain thecorresponding dryout heat fluxes. Bed-1 and Bed-2 are both packed with sand particles whosesize distributions are similar to that of the DEFOR debris particles, with Bed-2 having a simulantcake embedded in the upper layer of the bed. Bed-3 is packed with DEFOR debris particles.The experimental results show that the dryout heat flux of the top-flooding beds can be predictedb y the Reed’s model. The bottom injection of coolant increases the dryout heat flux significantly,i.e., with an increase in water injection flowrate, the value of dryout heat flux is elevated.Meanwhile, the elevation of dryout position is moving upwards with increasing bottom-injectionflowrate. When a cake exits in a particulate bed, the dryout heat flux of the bed is significantlydecreased (up to 50%), and the dryout points a l w a y s located in the cake, for both the topflooding and bottom-fed configurations.
Place, publisher, year, edition, pages
American Nuclear Society, 2011.
IdentifiersURN: urn:nbn:se:kth:diva-53584OAI: oai:DiVA.org:kth-53584DiVA: diva2:470382
2011 international congress on advances in nuclear power plants (ICAPP 2011), Nice, France, 2-5 May, 2011
QC 201204162011-12-282011-12-282012-04-16Bibliographically approved