Multiphysics Running-In Simulations for Pebble-Bed Reactors with Griffin.
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| Title: | Multiphysics Running-In Simulations for Pebble-Bed Reactors with Griffin. |
|---|---|
| Authors: | Hanophy, Joshua1 (AUTHOR) joshua.hanophy@inl.gov, Balestra, Paolo1 (AUTHOR), Wang, Yaqi1 (AUTHOR), Ortensi, Javier1 (AUTHOR), Schunert, Sebastian1 (AUTHOR) |
| Source: | Nuclear Science & Engineering. 2026 Suppl 1, Vol. 200, pS644-S658. 15p. |
| Subject Terms: | *Pebble bed reactors, *Computer simulation, *Transient analysis, *Fluid flow, *Heat transfer |
| Abstract: | Griffin, a Multiphysics Object-Oriented Simulation Environment (MOOSE)–based application targeting transient modeling of advanced reactors, has been used recently to model pebble-bed reactors (PBRs). The modeling effort has focused thus far on equilibrium core calculations. A new capability to simulate the running-in phase of PBR operation has been added to Griffin. This work demonstrates the new capability with a coupled multiphysics running-in simulation. Griffin computes power densities in the core at each time step of the running-in simulation and passes these to Pronghorn, which models fluid flow and heat transfer to calculate pebble surface temperatures. These surface temperatures are used along with the power densities in a heat conduction model to compute average fuel and moderator temperatures, which are passed back to Griffin and accounted for with temperature-dependent cross sections. This work also describes a novel methodology for determining appropriate pebble feed rates and control rod positioning during the running-in simulation. The RZ-geometry model used in this work requires minimal computational resources and can be used for optimization and uncertainty studies in future works. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 192155926 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Multiphysics Running-In Simulations for Pebble-Bed Reactors with Griffin. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Hanophy%2C+Joshua%22">Hanophy, Joshua</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> joshua.hanophy@inl.gov</i><br /><searchLink fieldCode="AR" term="%22Balestra%2C+Paolo%22">Balestra, Paolo</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Wang%2C+Yaqi%22">Wang, Yaqi</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Ortensi%2C+Javier%22">Ortensi, Javier</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Schunert%2C+Sebastian%22">Schunert, Sebastian</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Nuclear+Science+%26+Engineering%22">Nuclear Science & Engineering</searchLink>. 2026 Suppl 1, Vol. 200, pS644-S658. 15p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Pebble+bed+reactors%22">Pebble bed reactors</searchLink><br />*<searchLink fieldCode="DE" term="%22Computer+simulation%22">Computer simulation</searchLink><br />*<searchLink fieldCode="DE" term="%22Transient+analysis%22">Transient analysis</searchLink><br />*<searchLink fieldCode="DE" term="%22Fluid+flow%22">Fluid flow</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+transfer%22">Heat transfer</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Griffin, a Multiphysics Object-Oriented Simulation Environment (MOOSE)–based application targeting transient modeling of advanced reactors, has been used recently to model pebble-bed reactors (PBRs). The modeling effort has focused thus far on equilibrium core calculations. A new capability to simulate the running-in phase of PBR operation has been added to Griffin. This work demonstrates the new capability with a coupled multiphysics running-in simulation. Griffin computes power densities in the core at each time step of the running-in simulation and passes these to Pronghorn, which models fluid flow and heat transfer to calculate pebble surface temperatures. These surface temperatures are used along with the power densities in a heat conduction model to compute average fuel and moderator temperatures, which are passed back to Griffin and accounted for with temperature-dependent cross sections. This work also describes a novel methodology for determining appropriate pebble feed rates and control rod positioning during the running-in simulation. The RZ-geometry model used in this work requires minimal computational resources and can be used for optimization and uncertainty studies in future works. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1080/00295639.2025.2497025 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 15 StartPage: S644 Subjects: – SubjectFull: Pebble bed reactors Type: general – SubjectFull: Computer simulation Type: general – SubjectFull: Transient analysis Type: general – SubjectFull: Fluid flow Type: general – SubjectFull: Heat transfer Type: general Titles: – TitleFull: Multiphysics Running-In Simulations for Pebble-Bed Reactors with Griffin. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Hanophy, Joshua – PersonEntity: Name: NameFull: Balestra, Paolo – PersonEntity: Name: NameFull: Wang, Yaqi – PersonEntity: Name: NameFull: Ortensi, Javier – PersonEntity: Name: NameFull: Schunert, Sebastian IsPartOfRelationships: – BibEntity: Dates: – D: 02 M: 02 Text: 2026 Suppl 1 Type: published Y: 2026 Identifiers: – Type: issn-print Value: 00295639 Numbering: – Type: volume Value: 200 Titles: – TitleFull: Nuclear Science & Engineering Type: main |
| ResultId | 1 |
