Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors
An application of deuteride moderator for fast reactor cores is proposed for power flattening that can mitigate thermal spikes and alleviate the decrease in breeding ratio, which sometimes occurs when hydrogen moderator is applied as a moderator. Zirconium deuteride is employed in a form of pin arra...
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| Format: | Article |
| Language: | English |
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Wiley
2013-01-01
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| Series: | Science and Technology of Nuclear Installations |
| Online Access: | http://dx.doi.org/10.1155/2013/879634 |
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| author | Toshio Wakabayashi |
| author_facet | Toshio Wakabayashi |
| author_sort | Toshio Wakabayashi |
| collection | DOAJ |
| description | An application of deuteride moderator for fast reactor cores is proposed for power flattening that can mitigate thermal spikes and alleviate the decrease in breeding ratio, which sometimes occurs when hydrogen moderator is applied as a moderator. Zirconium deuteride is employed in a form of pin arrays at the inner most rows of radial blanket fuel assemblies, which works as a reflector in order to flatten the radial power distribution in the outer core region of MONJU. The power flattening can be utilized to increase core average burn-up by increasing operational time. The core characteristics have been evaluated with a continuous-energy model Monte Carlo code MVP and the JENDL-3.3 cross-section library. The result indicates that the discharged fuel burn-up can be increased by about 7% relative to that of no moderator in the blanket region due to the power flattening when the number of deuteride moderator pins is 61. The core characteristics and core safety such as void reactivity, Doppler coefficient, and reactivity insertion that occurred at dissolution of deuteron were evaluated. It was clear that the serious drawback did not appear from the viewpoints of the core characteristics and core safety. |
| format | Article |
| id | doaj-art-a0f3e28ed9314be4967c03e1c6b9f0ad |
| institution | Kabale University |
| issn | 1687-6075 1687-6083 |
| language | English |
| publishDate | 2013-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Science and Technology of Nuclear Installations |
| spelling | doaj-art-a0f3e28ed9314be4967c03e1c6b9f0ad2025-02-03T01:09:36ZengWileyScience and Technology of Nuclear Installations1687-60751687-60832013-01-01201310.1155/2013/879634879634Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast ReactorsToshio Wakabayashi0Department of Quantum Science and Energy Engineering, Tohoku University, 6-6-01-2 Aramaki Aoba, Aoba-ku, Sendai 980-8579, JapanAn application of deuteride moderator for fast reactor cores is proposed for power flattening that can mitigate thermal spikes and alleviate the decrease in breeding ratio, which sometimes occurs when hydrogen moderator is applied as a moderator. Zirconium deuteride is employed in a form of pin arrays at the inner most rows of radial blanket fuel assemblies, which works as a reflector in order to flatten the radial power distribution in the outer core region of MONJU. The power flattening can be utilized to increase core average burn-up by increasing operational time. The core characteristics have been evaluated with a continuous-energy model Monte Carlo code MVP and the JENDL-3.3 cross-section library. The result indicates that the discharged fuel burn-up can be increased by about 7% relative to that of no moderator in the blanket region due to the power flattening when the number of deuteride moderator pins is 61. The core characteristics and core safety such as void reactivity, Doppler coefficient, and reactivity insertion that occurred at dissolution of deuteron were evaluated. It was clear that the serious drawback did not appear from the viewpoints of the core characteristics and core safety.http://dx.doi.org/10.1155/2013/879634 |
| spellingShingle | Toshio Wakabayashi Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors Science and Technology of Nuclear Installations |
| title | Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors |
| title_full | Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors |
| title_fullStr | Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors |
| title_full_unstemmed | Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors |
| title_short | Improvement of Core Performance by Introduction of Moderators in a Blanket Region of Fast Reactors |
| title_sort | improvement of core performance by introduction of moderators in a blanket region of fast reactors |
| url | http://dx.doi.org/10.1155/2013/879634 |
| work_keys_str_mv | AT toshiowakabayashi improvementofcoreperformancebyintroductionofmoderatorsinablanketregionoffastreactors |