[en] MELCOR 1.8.4 code has been employed to simulate the KAEVER-188 test that was proposed as an open experiment of International Standard Problem No.44 by OECD-CSNI. The main purpose of this study is to evaluate the accuracy of the MELCOR aerosol model which calculates the aerosol distribution and settlement in a containment. For this, thermal hydraulic conditions are simulated first for the whole test period and then the behavior of highly hygroscopic CsOH aerosol, which is a predominant activity carrier in a release into the containment, is compared between the experimental results and the code predictions. The calculation results of vessel atmospheric concentration show a good simulation for dry aerosol decay but show large difference for wet aerosol decay due to a data mismatch in vessel humidity and the hygroscopicity. (author)