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Monte Carlo simulation and benchmarking of pulsed neutron experiments in variable buckling Beo systems
, Article Annals of Nuclear Energy ; Volume 36, Issue 5 , 2009 , Pages 547-549 ; 03064549 (ISSN) ; Ezzati, A. O ; Sharif University of Technology
2009
Abstract
Pulsed neutron decay simulation of BeO moderator as a result of injecting 14 MeV neutron pulses into finite size systems are carried out with the MCNP Monte Carlo code. The simulated decay constants as compared against a previous experimental work showed variations of about 2%. The resulting decay constants and the fitted diffusion coefficients based on the simulation results are found to agree with the experimental results within a margin of about 4%. © 2009 Elsevier Ltd. All rights reserved
Comparative modeling of stochastic versus regular arrangement of TRISO particles in HTTR
, Article Progress in Nuclear Energy ; Volume 78 , January , 2015 , Pages 291-296 ; 01491970 (ISSN) ; Ghofrani, M. B ; Ezzati, A. O ; Sharif University of Technology
Elsevier Ltd
2015
Abstract
TRISO particles are the specific features of HTTR and generally HTGR reactors. Their heterogeneity and random arrangement in graphite matrix of these reactors create a significant modeling challenge. In this study, an algorithm is proposed for modeling random arrangement of TRISO particles in the fuel compacts of HTTR. The effect of this arrangement on criticality calculations, i.e. effective multiplication factor and critical position of control rods, is then compared with regular arrangement. Regular arrangement was modeled by positioning each TRISO as a fixed sphere in the center of a cubic lattice and subsequently, each fuel compact was filled with around 13,000 (approximate number of...