Publication: Safety-oriented CFD analysis of the PeLUIt-40 pebblebed HTGR under partial flow and LOCA scenarios
Дата
2026
Авторы
Afif, M. T.
Sulistyo, F. Y.
Veretennikov, D. G.
Journal Title
Nuclear Energy and Technology (NUCET)
Journal ISSN
Volume Title
Nuclear Energy and Technology (NUCET)
Издатель
НИЯУ МИФИ
Аннотация
In this study, the thermal–hydraulic behavior of the Indonesian Micro Reactor PeLUIt-40, a 40 MWt modular pebble-bed high-temperature gas-cooled reactor (HTGR), was analyzed under reduced coolant flow and loss-of-coolant accident (LOCA) conditions. Three-dimensional computational fluid dynamics (CFD) simulations using a porous-media core model and volumetric heat sources from neutronic analysis were performed. Steady-state simulations were conducted for helium flow rates from 100% to 25% of nominal, and a transient LOCA was simulated by reducing flow to zero over ten seconds. The results show that maximum core temperatures increased nonlinearly with reduced flow, exceeding TRISO fuel limits at 25% flow, while outlet duct temperatures remained well homogenized. During the LOCA, passive buoyancy-driven circulation limited temperature rise, stabilizing around 1026 °C. These findings provide preliminary insight into PeLUIt-40 thermal hydraulics, highlighting the need for further validation and extended transient analysis to confirm safety margins.
Описание
Ключевые слова
Thermal hydraulics , Safety analysis , PeLUIt-40 , Loss-of-coolant accident , HTGR , CFD
Цитирование
Afif MT, Sulistyo FY, Veretennikov DG (2026) Safety-oriented CFD analysis of the PeLUIt-40 pebble-bed HTGR under partial flow and LOCA scenarios. Nuclear Energy and Technology 12(1): 19–28. https://doi.org/10.3897/nucet.12.173615