Simulation of core melt pool formation in a reactor pressure vessel lower head using an effective convectivity model
2009 (English)In: Nuclear engineering and technology : an international journal of the Korean Nuclear Society, ISSN 1738-5733, Vol. 41, no 7, 929-944 p.Article in journal (Refereed) Published
The present study is concerned with the extension of the Effective Convectivity Model (ECM) to the phase-change problem to simulate the dynamics of the melt pool formation in a Light Water Reactor (LWR) lower plenum during hypothetical severe accident progression. The ECM uses heat transfer characteristic velocities to describe turbulent natural convection of a melt pool. The simple approach of the ECM method allows implementing different models of the characteristic velocity in a Mushy Zone for non-eutectic mixtures. The Phase-change ECM (PECM) was examined using three models of the characteristic velocities in a mushy zone and its performance was compared. The PECM was validated using a dual-tier approach, namely validations against existing experimental data (the SIMECO experiment) and validations against results obtained from Computational Fluid Dynamics (CFD) simulations. The results predicted by the PECM implementing the linear dependency of mushy-zone characteristic velocity On fluid fraction are well agreed with the experimental correlation and CFD simulation results. The PECM was applied to simulation of melt pool formation heat transfer in a Pressurized Water Reactor (PWR) and Boiling Water Reactor (BWR) lower plenum. The Study suggests that the PECM is an adequate and effective tool to compute the dynamics of core melt pool formation.
Place, publisher, year, edition, pages
2009. Vol. 41, no 7, 929-944 p.
Heat Transfer, Effective Convectivity Model, Characteristic Velocity, Phase Change, Mushy Zone, Core Melt Pool, Severe Accident
Energy Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-24070ISI: 000270560100007ScopusID: 2-s2.0-70350161939OAI: oai:DiVA.org:kth-24070DiVA: diva2:343176
QC 201008122010-08-122010-08-122014-10-08Bibliographically approved