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Quality improvements of thermodynamic data applied to corium interactions for severe accident modelling in SARNET2
KTH, School of Engineering Sciences (SCI), Physics, Nuclear Power Safety. Aleksandrov RIT/NITI, Russia.ORCID iD: 0000-0001-7816-8442
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2014 (English)In: Annals of Nuclear Energy, ISSN 0306-4549, E-ISSN 1873-2100, Vol. 74, 110-124 p.Article in journal (Refereed) Published
Abstract [en]

In a severe accident transient, corium composition and its properties determine its behaviour and its potential interactions both with the reactor vessel and in the later phases with the concrete basemat. This, in turn, requires a detailed knowledge of the phases present at temperature and how they are formed. Because it implies mainly the investigation of chemical systems at high temperature, these data are often difficult to obtain or are uncertain if it already exists. Therefore more data are required both to complete the thermodynamic databanks (such as NUCLEA) and to construct accurate equilibrium phase diagrams and to finally contribute to the improvement of the codes simulating these severe accident conditions. The MCCI work package (WP6) of the SARNET 2 Network of Excellence has been addressing these problems. In this framework in large facilities such as VULCANO tests have been performed on the interactions and ablation of UO2-containing melts with concrete. They have been completed by large scale MCCI testing such EPICOR on vessel steel corrosion. In parallel in major EU-funded ISTC projects co-ordinated with national institutes, such as the CORPHAD and PRECOS, smaller, single effect tests have been carried out on the more difficult phase diagrams. These have produced data that can be directly used by databanks and for modelling improvement/validation. From these data significant advances in the melt chemistry and pool behaviour have been made. A selection of experiments from participating institutes are presented in this paper and give hindsight into the major processes and so give clear indications for the future work, especially in light of the Fukushima accident.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 74, 110-124 p.
Keyword [en]
Corium, Severe accidents, Thermodynamic database
National Category
Physical Sciences
URN: urn:nbn:se:kth:diva-161672DOI: 10.1016/j.anucene.2014.06.023ISI: 000343337800011ScopusID: 2-s2.0-84949116392OAI: diva2:799799
6th European Review Meeting on Severe Accident Research (ERMSAR-2013)
EU, FP7, Seventh Framework Programme, 231747

QC 20150331

Available from: 2015-03-31 Created: 2015-03-13 Last updated: 2016-04-08Bibliographically approved

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