An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors
© 2020 American Nuclear Society. Investigating thermal stratification in the upper plenum of a sodium fast reactor (SFR) is currently a technology gap in SFR safety analysis. Understanding thermal stratification will promote safe operation of the SFR before its commercial deployment. Stratified laye...
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Informa UK Limited
2021
|
| Online Access: | https://hdl.handle.net/1721.1/134014 |
| _version_ | 1826196087190323200 |
|---|---|
| author | Lu, Cihang Wu, Zeyun Morgan, Sarah Schneider, James Anderson, Mark Xu, Liangyu Baglietto, Emilio Bucknor, Matthew Weathered, Matthew Bilbao y Leon, Sama |
| author_facet | Lu, Cihang Wu, Zeyun Morgan, Sarah Schneider, James Anderson, Mark Xu, Liangyu Baglietto, Emilio Bucknor, Matthew Weathered, Matthew Bilbao y Leon, Sama |
| author_sort | Lu, Cihang |
| collection | MIT |
| description | © 2020 American Nuclear Society. Investigating thermal stratification in the upper plenum of a sodium fast reactor (SFR) is currently a technology gap in SFR safety analysis. Understanding thermal stratification will promote safe operation of the SFR before its commercial deployment. Stratified layers of liquid sodium with a large vertical temperature gradient could be established in the upper plenum of an SFR during a down-power or a loss-of-flow transient. These stratified layers are unstable and could result in uncertainties for the core safety of an SFR. In order to predict the occurrence of the thermal stratification efficiently, we developed a one-dimensional (1-D) transport model to estimate the temperature profile of the ambient fluid in the upper plenum. This model demands much less computational effort than computational fluid dynamics (CFD) codes and provides calculations with higher fidelity than historical system-level codes. Two flow conditions were considered separately in the current study depending on if in-vessel components are presented in the upper plenum. For the condition where in-vessel components, specifically the upper internal structure, are presented, we assumed that the impinging sodium was evenly dispersed in the ambient fluid within the distance between the bottom of the in-vessel component and the jet inlet surface. For the condition where no in-vessel components are presented, we assumed that the impinging sodium was evenly dispersed in the ambient fluid within the jet length, which was determined through data-driven trainings. The newly developed 1-D model showed similar performance with the CFD model in both cases. However, due to the assumption of flat profiles of the impinging jet axial dispersion rate, nonnegligible discrepancies between the 1-D prediction and the measured data were observed. |
| first_indexed | 2024-09-23T10:20:18Z |
| format | Article |
| id | mit-1721.1/134014 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T10:20:18Z |
| publishDate | 2021 |
| publisher | Informa UK Limited |
| record_format | dspace |
| spelling | mit-1721.1/1340142021-10-28T04:31:39Z An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors Lu, Cihang Wu, Zeyun Morgan, Sarah Schneider, James Anderson, Mark Xu, Liangyu Baglietto, Emilio Bucknor, Matthew Weathered, Matthew Bilbao y Leon, Sama © 2020 American Nuclear Society. Investigating thermal stratification in the upper plenum of a sodium fast reactor (SFR) is currently a technology gap in SFR safety analysis. Understanding thermal stratification will promote safe operation of the SFR before its commercial deployment. Stratified layers of liquid sodium with a large vertical temperature gradient could be established in the upper plenum of an SFR during a down-power or a loss-of-flow transient. These stratified layers are unstable and could result in uncertainties for the core safety of an SFR. In order to predict the occurrence of the thermal stratification efficiently, we developed a one-dimensional (1-D) transport model to estimate the temperature profile of the ambient fluid in the upper plenum. This model demands much less computational effort than computational fluid dynamics (CFD) codes and provides calculations with higher fidelity than historical system-level codes. Two flow conditions were considered separately in the current study depending on if in-vessel components are presented in the upper plenum. For the condition where in-vessel components, specifically the upper internal structure, are presented, we assumed that the impinging sodium was evenly dispersed in the ambient fluid within the distance between the bottom of the in-vessel component and the jet inlet surface. For the condition where no in-vessel components are presented, we assumed that the impinging sodium was evenly dispersed in the ambient fluid within the jet length, which was determined through data-driven trainings. The newly developed 1-D model showed similar performance with the CFD model in both cases. However, due to the assumption of flat profiles of the impinging jet axial dispersion rate, nonnegligible discrepancies between the 1-D prediction and the measured data were observed. 2021-10-27T19:57:38Z 2021-10-27T19:57:38Z 2020 2021-08-10T14:08:15Z Article http://purl.org/eprint/type/JournalArticle https://hdl.handle.net/1721.1/134014 en 10.1080/00295450.2020.1719799 Nuclear Technology Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Informa UK Limited DOE repository |
| spellingShingle | Lu, Cihang Wu, Zeyun Morgan, Sarah Schneider, James Anderson, Mark Xu, Liangyu Baglietto, Emilio Bucknor, Matthew Weathered, Matthew Bilbao y Leon, Sama An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors |
| title | An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors |
| title_full | An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors |
| title_fullStr | An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors |
| title_full_unstemmed | An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors |
| title_short | An Efficient 1-D Thermal Stratification Model for Pool-Type Sodium-Cooled Fast Reactors |
| title_sort | efficient 1 d thermal stratification model for pool type sodium cooled fast reactors |
| url | https://hdl.handle.net/1721.1/134014 |
| work_keys_str_mv | AT lucihang anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT wuzeyun anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT morgansarah anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT schneiderjames anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT andersonmark anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT xuliangyu anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT bagliettoemilio anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT bucknormatthew anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT weatheredmatthew anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT bilbaoyleonsama anefficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT lucihang efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT wuzeyun efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT morgansarah efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT schneiderjames efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT andersonmark efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT xuliangyu efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT bagliettoemilio efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT bucknormatthew efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT weatheredmatthew efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors AT bilbaoyleonsama efficient1dthermalstratificationmodelforpooltypesodiumcooledfastreactors |