2020年3月3日
Measurement of a very large negative reactivity inserted by rapid withdrawal of a partial fuel loading in Kyoto University Critical Assembly
Journal of Nuclear Science and Technology
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- 巻
- 57
- 号
- 3
- 開始ページ
- 335
- 終了ページ
- 343
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1080/00223131.2019.1661307
- 出版者・発行元
- Informa UK Limited
Solid-moderated cores of the Kyoto University Critical Assembly (KUCA) have an emergency shutdown system to avoid any reactivity-initiated accidents. When a reactor protection system of KUCA detects some abnormal conditions, the emergency system withdraws downward several fuel and reflector assemblies assigned as a central fuel loading from the core in 10 and several seconds. The withdrawal of the fuel loading inserts a very large negative reactivity into the core. The negative reactivity has been measured by the integral count technique; however, the application of the integral count technique to this measurement must have been impossible in principle. The integral count technique assumes an instantaneous insertion of a large negative reactivity but the assumption must fail for this measurement. An accurate measurement of the negative reactivity is of extreme importance from the viewpoint of reactor safety. In this study, the least-squares inverse kinetics method was employed to determine the negative reactivity from time-sequence counts data of a neutron counter. The negative reactivity determined by this method was in good agreement with that calculated by the continuous-energy Monte Carlo code MVP (version 3) with the nuclear data library JENDL-4.0.
- リンク情報
- ID情報
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- DOI : 10.1080/00223131.2019.1661307
- ISSN : 0022-3131
- eISSN : 1881-1248
- Web of Science ID : WOS:000485738500001