Cross Section Generation Strategy for Advanced LWRs
A method for generating few-group homogenized cross sections using three-dimensional Monte Carlo assembly calculations is described and compared to a traditional two-dimensional assembly homogenization method. It is demonstrated that the traditional two-dimensional method of few-group homogenized cr...
| Asıl Yazarlar: | , , , |
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| Diğer Yazarlar: | |
| Materyal Türü: | Makale |
| Dil: | English |
| Baskı/Yayın Bilgisi: |
International Atomic Energy Agency (IAEA)
2019
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| Online Erişim: | https://hdl.handle.net/1721.1/121388 |
| _version_ | 1826194609282220032 |
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| author | Herman, Bryan R Shwageraus, Eugene Forget, Benoit Robert Yves Leppaenen, Jaakko |
| author2 | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering |
| author_facet | Massachusetts Institute of Technology. Department of Nuclear Science and Engineering Herman, Bryan R Shwageraus, Eugene Forget, Benoit Robert Yves Leppaenen, Jaakko |
| author_sort | Herman, Bryan R |
| collection | MIT |
| description | A method for generating few-group homogenized cross sections using three-dimensional Monte Carlo assembly calculations is described and compared to a traditional two-dimensional assembly homogenization method. It is demonstrated that the traditional two-dimensional method of few-group homogenized cross section generation for full core analyses may not be sufficient for high conversion LWR designs. In these types of reactors, such as the Hitachi RBWR, separate fissile and blanket zones are required for breeding and for managing void reactivity feedback, resulting in highly axially-heterogeneous assemblies. In the two-dimensional calculation, each zone was decoupled from other zones by assuming zero net current boundary conditions. In the three-dimensional calculation, the presence of other axial zones that influence the generation of homogenized cross sections is explicitly captured. Differences in flux energy spectra were seen, leading to differences in 2-group homogenized cross sections of up to 50%. The differences in the homogenized parameters were highest in interface zones and near the top of the assembly due to the presence of an axial reflector and a high coolant void fraction. It was determined that these errors may be significant and propagate to the full core analysis of these types of advanced LWRs. |
| first_indexed | 2024-09-23T09:58:54Z |
| format | Article |
| id | mit-1721.1/121388 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T09:58:54Z |
| publishDate | 2019 |
| publisher | International Atomic Energy Agency (IAEA) |
| record_format | dspace |
| spelling | mit-1721.1/1213882022-09-26T14:59:24Z Cross Section Generation Strategy for Advanced LWRs Herman, Bryan R Shwageraus, Eugene Forget, Benoit Robert Yves Leppaenen, Jaakko Massachusetts Institute of Technology. Department of Nuclear Science and Engineering A method for generating few-group homogenized cross sections using three-dimensional Monte Carlo assembly calculations is described and compared to a traditional two-dimensional assembly homogenization method. It is demonstrated that the traditional two-dimensional method of few-group homogenized cross section generation for full core analyses may not be sufficient for high conversion LWR designs. In these types of reactors, such as the Hitachi RBWR, separate fissile and blanket zones are required for breeding and for managing void reactivity feedback, resulting in highly axially-heterogeneous assemblies. In the two-dimensional calculation, each zone was decoupled from other zones by assuming zero net current boundary conditions. In the three-dimensional calculation, the presence of other axial zones that influence the generation of homogenized cross sections is explicitly captured. Differences in flux energy spectra were seen, leading to differences in 2-group homogenized cross sections of up to 50%. The differences in the homogenized parameters were highest in interface zones and near the top of the assembly due to the presence of an axial reflector and a high coolant void fraction. It was determined that these errors may be significant and propagate to the full core analysis of these types of advanced LWRs. United States. Department of Energy. Naval Reactors Division (Rickover Fellowship) 2019-06-24T13:47:05Z 2019-06-24T13:47:05Z 2011-05 2019-06-20T12:52:36Z Article http://purl.org/eprint/type/ConferencePaper https://hdl.handle.net/1721.1/121388 Herman, Bryan et al. "Cross Section Generation Strategy for Advanced LWRs." Proceedings of ICAPP 2011, 2-5 May, 2011, Nice, France, IAEA, 2011. en https://inis.iaea.org/search/search.aspx?orig_q=RN:44092964 Proceedings of ICAPP 2011 Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf International Atomic Energy Agency (IAEA) Prof. Forget via Chris Sherratt |
| spellingShingle | Herman, Bryan R Shwageraus, Eugene Forget, Benoit Robert Yves Leppaenen, Jaakko Cross Section Generation Strategy for Advanced LWRs |
| title | Cross Section Generation Strategy for Advanced LWRs |
| title_full | Cross Section Generation Strategy for Advanced LWRs |
| title_fullStr | Cross Section Generation Strategy for Advanced LWRs |
| title_full_unstemmed | Cross Section Generation Strategy for Advanced LWRs |
| title_short | Cross Section Generation Strategy for Advanced LWRs |
| title_sort | cross section generation strategy for advanced lwrs |
| url | https://hdl.handle.net/1721.1/121388 |
| work_keys_str_mv | AT hermanbryanr crosssectiongenerationstrategyforadvancedlwrs AT shwagerauseugene crosssectiongenerationstrategyforadvancedlwrs AT forgetbenoitrobertyves crosssectiongenerationstrategyforadvancedlwrs AT leppaenenjaakko crosssectiongenerationstrategyforadvancedlwrs |