Possibility of YH1.85 and MgO-BeO as a moderator in high temperature reactors

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dc.contributor.authorTiftikci, Ali
dc.date.accessioned2025-03-23T19:38:22Z
dc.date.available2025-03-23T19:38:22Z
dc.date.issued2024
dc.departmentSinop Üniversitesi
dc.description.abstractThis study compared the neutronic behaviors of the graphite material utilized in standard HTGR reactors to those of yttrium hydride and MgO-BeO moderator materials using the OpenMC and Serpent Monte Carlo codes. keff values for various fuel/moderator ratios in a TRISO particle-embedded moderator matrix were computed. The effect of packing fraction was then investigated, and the keff values for different packing fractions were compared for the MgO-BeO, YH1.85, and C (graphite) moderator matrices in the geometry layout containing randomly placed TRISO particles. In contrast to graphite and MgO-BeO moderators, the keff values for YH1.85 moderator indicated that a very small moderator volume is adequate for thermalization. We also investigated how temperature reactivity feedback impacts different packing fractions. In the temperature reactivity feedback analysis, the overall temperature coefficient was determined to be negative for all moderators. The temperature feedback coefficient for the fuel with the YH1.85 moderator was found to be significantly lower in magnitude than for the system with graphite and MgO-BeO. The burnup findings revealed that graphite and MgO-BeO behaved similarly; however, YH1.85 was shown to be useful only at very low moderator/fuel ratios. With typical HTGR power density, the fuel cycle time for YH1.85 was found to be around 516 days. Also, while the YH1.85 moderator system reduces the risk of proliferation by producing small amounts of 239Pu and 241Pu, it was determined that it is more suitable for small modular and microreactor designs for high-temperature reactors with low moderator/fuel ratio requirements.
dc.identifier.doi10.1016/j.pnucene.2023.105041
dc.identifier.issn0149-1970
dc.identifier.issn1878-4224
dc.identifier.scopus2-s2.0-85181077802
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1016/j.pnucene.2023.105041
dc.identifier.urihttps://hdl.handle.net/11486/6135
dc.identifier.volume168
dc.identifier.wosWOS:001146659000001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthorTiftikci, Ali
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.relation.ispartofProgress in Nuclear Energy
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.snmzKA_WOS_20250323
dc.subjectYttrium hydride
dc.subjectMgO-BeO
dc.subjectMonte Carlo model
dc.subjectTRISO particle
dc.subjectSmall modular
dc.subjectMicroreactor
dc.titlePossibility of YH1.85 and MgO-BeO as a moderator in high temperature reactors
dc.typeArticle

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