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Effect of particle spreading on coolability of Ex-Vessel debris BED
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety.
2015 (English)In: International Topical Meeting on Nuclear Reactor Thermal Hydraulics 2015, NURETH 2015, American Nuclear Society, 2015, 1210-1222 p.Conference paper (Refereed)Text
Abstract [en]

Debris bed formation and coolability are studied by DECOSIM code. Main physical mechanisms affecting dispersed particle spreading in the course of melt-water interaction are considered, and their relevance to the formation of porous debris bed in various melt ejection modes is discussed. Numerical simulations of gradually growing and instantly formed debris beds are performed by DECOSIM code. Also, coupled simulations are carried out in which all mechanisms are taken into account simultaneously. It is shown that particle spreading limits the height of debris bed. Also, it is obtained that in some parameter ranges even if local dryout occurs, further particle spreading can render the debris bed coolable, resulting in its reflooding and quenching of the material.

Place, publisher, year, edition, pages
American Nuclear Society, 2015. 1210-1222 p.
Keyword [en]
Coolability, Debris bed, Particle spreading, Severe accident, Two-phase flow, Hydraulics, Nuclear reactor accidents, Nuclear reactors, Two phase flow, Coupled simulation, Dispersed particle, Melt ejection, Parameter range, Physical mechanism, Debris
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:kth:diva-187541ScopusID: 2-s2.0-84962652942ISBN: 9781510811843OAI: oai:DiVA.org:kth-187541DiVA: diva2:936981
Conference
16th International Topical Meeting on Nuclear Reactor Thermal Hydraulics, NURETH 2015, 30 August 2015 through 4 September 2015
Note

QC 20160614

Available from: 2016-06-14 Created: 2016-05-25 Last updated: 2016-06-14Bibliographically approved

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Konovalenko, AlexanderBasso, SimoneKudinov, Pavel
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