Modeling of melt retention in EU-APR1400 ex-vessel core catcher
2012 (English)In: International Congress on Advances in Nuclear Power Plants 2012, ICAPP 2012, 2012, 1412-1421 p.Conference paper (Refereed)
A core catcher is adopted in the EU-APR1400 reactor design for management and mitigation of severe accidents with reactor core melting. The core catcher concept incorporates a number of engineering solutions used in the catcher designs of European EPR and Russian WER-1000 reactors, such as thin-layer corium spreading for better cooling, retention of the melt in a water-cooled steel vessel, and use of sacrificial material (SM) to control the melt properties. SM is one of the key elements of the catcher design and its performance is critical for melt retention efficiency. This SM consists of oxide components, but the core catcher also includes sacrificial steel which reacts with the metal melt of the molten corium to reduce its temperature. The paper describes the required properties of SM. The melt retention capability of the core catcher can be confirmed by modeling the heat fluxes to the catcher vessel to show that it will not fail. The fulfillment of this requirement is demonstrated on the example of LBLOCA severe accident. Thermal and physicochemical interactions between the oxide and metal melts, interactions of the melts with SM, sacrificial steel and vessel, core catcher external cooling by water and release of non-condensable gases are modeled.
Place, publisher, year, edition, pages
2012. 1412-1421 p.
Catcher design, Core catchers, Engineering solutions, External cooling, Key elements, Melt properties, Metal melts, Molten Corium, Non-condensable gas, Oxide components, Physicochemical interactions, Reactor designs, Retention efficiencies, Sacrificial material, Severe accident, Steel vessels, Thin layers, Accidents, Design, Metal melting, Nuclear power plants, Reactor cores
IdentifiersURN: urn:nbn:se:kth:diva-114014ScopusID: 2-s2.0-84869049925ISBN: 978-162276210-1OAI: oai:DiVA.org:kth-114014DiVA: diva2:588182
International Congress on Advances in Nuclear Power Plants 2012, ICAPP 2012, 24 June 2012 through 28 June 2012, Chicago, IL
QC 201301152013-01-152013-01-152013-01-15Bibliographically approved