Neutron Generation Time in Highly-Enriched Uranium Core at Kyoto University Critical Assembly
| Autor: | Go Chiba, Masao Yamanaka, Tomohiro Endo, Kenichi Watanabe, Cheol Ho Pyeon, Willem Fredrik G. van Rooijen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
010308 nuclear & particles physics Near critical Nuclear engineering Mathematics::Analysis of PDEs 0211 other engineering and technologies near critical 02 engineering and technology Enriched uranium 01 natural sciences Neutron temperature Supercritical fluid Core (optical fiber) Nuclear Energy and Engineering Neutron generation time thermal neutron spectrum 0103 physical sciences highly enriched uranium core Neutron 021108 energy Kyoto University Critical Assembly Nonlinear Sciences::Pattern Formation and Solitons |
| Zdroj: | Nuclear Science and Engineering. 194:1116-1127 |
| ISSN: | 1943-748X 0029-5639 |
| DOI: | 10.1080/00295639.2020.1774230 |
| Popis: | At the Kyoto University Critical Assembly experiments on kinetics parameters are carried out at near-critical configurations, supercritical and subcritical states, in the thermal neutron spectrum made with a highly enriched uranium fuel. The main calculated kinetics parameters, the effective delayed neutron fraction (βeff) and the neutron generation time (Ʌ), are used effectively for the estimation of experimental parameters, and the accuracy of experiments on prompt neutron decay constant (α) and subcriticality (ρ$) in dollar units is attained by the numerical results of βeff and Ʌ. Furthermore, the value of βeff/Ʌ is experimentally deduced with the use of the experimental results of α and ρ$, ranging between 250 and −80 pcm. Thus, the experimentally deduced values of βeff/Ʌ that reveal good accuracy through a comparison with those by the MCNP6.1 calculations with JENDL-4.0 are then taken as an index of Ʌ by introducing an acceptable assumption of βeff at near-critical configurations. From the results of experimental and numerical analyses, the experimental value of βeff/Ʌ is important for the validation of Ʌ since kinetics parameters are successfully obtained from the clean cores of near-critical configurations in the thermal neutron spectrum. |
| Databáze: | OpenAIRE |
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