Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics
This work presents a simplified 1D model for a pressurized water reactor core, suitable for very rapid transients like control rod ejection. The model is represented using the bond graph formalism, a technique for modeling engineering systems as combinations of connected elements. Bond graphs are a...
| Main Authors: | , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Elsevier
2017
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| Online Access: | http://hdl.handle.net/1721.1/108112 |
| _version_ | 1826213520572678144 |
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| author | Sosnovsky, Eugeny Forget, Benoit |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Sosnovsky, Eugeny Forget, Benoit |
| author_sort | Sosnovsky, Eugeny |
| collection | MIT |
| description | This work presents a simplified 1D model for a pressurized water reactor core, suitable for very rapid transients like control rod ejection. The model is represented using the bond graph formalism, a technique for modeling engineering systems as combinations of connected elements. Bond graphs are a flexible way of presenting coupled physics problems by automating the computer science aspects of modeling and letting the modelers focus on the physics; they were introduced in earlier work. To help leverage the flexibility of bond graph representations of physical systems, a new bond graph processing code, BGSolver, is introduced. BGSolver has been developed by the authors over the past several years, and is now released as open source software. A rapid rod ejection benchmark is solved with both BGSolver and RELAP5-3D; BGSolver obtained full convergence with a 5 ms time step, while RELAP5-3D required a 1 ms time step, due to the fully coupled time integration that BGSolver employed, compared to an operator splitting-based time integrator of RELAP5-3D. BGSolver’s time integrator demonstrated 3rd-order convergence in time, a very desirable property. A single nonlinear solve was used to obtain the steady state with BGSolver. |
| first_indexed | 2024-09-23T15:50:54Z |
| format | Article |
| id | mit-1721.1/108112 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:50:54Z |
| publishDate | 2017 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | mit-1721.1/1081122024-06-28T14:06:34Z Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics Sosnovsky, Eugeny Forget, Benoit Massachusetts Institute of Technology. Department of Nuclear Science and Engineering forget benoit This work presents a simplified 1D model for a pressurized water reactor core, suitable for very rapid transients like control rod ejection. The model is represented using the bond graph formalism, a technique for modeling engineering systems as combinations of connected elements. Bond graphs are a flexible way of presenting coupled physics problems by automating the computer science aspects of modeling and letting the modelers focus on the physics; they were introduced in earlier work. To help leverage the flexibility of bond graph representations of physical systems, a new bond graph processing code, BGSolver, is introduced. BGSolver has been developed by the authors over the past several years, and is now released as open source software. A rapid rod ejection benchmark is solved with both BGSolver and RELAP5-3D; BGSolver obtained full convergence with a 5 ms time step, while RELAP5-3D required a 1 ms time step, due to the fully coupled time integration that BGSolver employed, compared to an operator splitting-based time integrator of RELAP5-3D. BGSolver’s time integrator demonstrated 3rd-order convergence in time, a very desirable property. A single nonlinear solve was used to obtain the steady state with BGSolver. United States. Office of the Assistant Secretary for Nuclear Energy (Nuclear Energy University Program fellowship) 2017-04-13T16:41:16Z 2017-04-13T16:41:16Z 2014-01 2013-10 Article http://purl.org/eprint/type/JournalArticle 03064549 http://hdl.handle.net/1721.1/108112 Sosnovsky, Eugeny and Benoit Forget. "Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics." Annals of Nuclear Energy 68 (June 2014): 15-29. en_US http://dx.doi.org/10.1016/j.anucene.2013.12.013 Annals of Nuclear Energy Creative Commons Attribution-NonCommercial-NoDerivs License http://creativecommons.org/licenses/by-nc-nd/4.0/ application/pdf Elsevier Prof. Forget via Chris Sherratt |
| spellingShingle | Sosnovsky, Eugeny Forget, Benoit Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| title | Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| title_full | Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| title_fullStr | Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| title_full_unstemmed | Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| title_short | Bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| title_sort | bond graph representation of nuclear reactor point kinetics and nearly incompressible thermal hydraulics |
| url | http://hdl.handle.net/1721.1/108112 |
| work_keys_str_mv | AT sosnovskyeugeny bondgraphrepresentationofnuclearreactorpointkineticsandnearlyincompressiblethermalhydraulics AT forgetbenoit bondgraphrepresentationofnuclearreactorpointkineticsandnearlyincompressiblethermalhydraulics |