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Safety-oriented CFD analysis of the PeLUIt-40 pebblebed HTGR under partial flow and LOCA scenarios

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creativeworkseries.issn2452-3038
dc.contributor.authorAfif, M. T.
dc.contributor.authorSulistyo, F. Y.
dc.contributor.authorVeretennikov, D. G.
dc.date.accessioned2026-05-28T14:30:55Z
dc.date.available2026-05-28T14:30:55Z
dc.date.issued2026
dc.description.abstractIn 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.
dc.description.urihttps://nucet.pensoft.net/article/173615/
dc.identifier.citationAfif 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
dc.identifier.doi10.3897/nucet.12.173615
dc.identifier.urihttps://openrepository.mephi.ru/handle/123456789/42571
dc.publisherНИЯУ МИФИ
dc.subjectThermal hydraulics
dc.subjectSafety analysis
dc.subjectPeLUIt-40
dc.subjectLoss-of-coolant accident
dc.subjectHTGR
dc.subjectCFD
dc.titleSafety-oriented CFD analysis of the PeLUIt-40 pebblebed HTGR under partial flow and LOCA scenarios
dc.typeArticleru
dspace.entity.typePublication
journal.titleNuclear Energy and Technology (NUCET)
journalvolume.identifier.nameNuclear Energy and Technology (NUCET)
relation.isJournalIssueOfPublicationc591352d-eef6-4b8e-bf6d-08c7f7c3677e
relation.isJournalIssueOfPublication.latestForDiscoveryc591352d-eef6-4b8e-bf6d-08c7f7c3677e
relation.isJournalOfPublicatione11ecc6c-1851-485a-af73-18119b4fce7f
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