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Remarks on beryllium nuclear data for fusion reactors
https://repo.qst.go.jp/records/2002219
https://repo.qst.go.jp/records/2002219af3cea9c-1f60-4316-9639-4b9440511167
| アイテムタイプ | 会議発表用資料 / Presentation(1) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 公開日 | 2025-06-25 | |||||||||
| タイトル | ||||||||||
| タイトル | Remarks on beryllium nuclear data for fusion reactors | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||||||
| 資源タイプ | conference presentation | |||||||||
| 著者 |
Saerom Kwon
× Saerom Kwon
× Masuda Kai
|
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| 抄録 | ||||||||||
| 内容記述 | Beryllium, 9Be, is an important functional material for a fusion blanket as a neutron multiplier and moderator and will be irradiated in test modules at the Advanced Fusion Neutron Source (A-FNS) to obtain the neutron irradiation characteristics data. However, the nuclear data of beryllium has been suspicious by several integral experiments.JAEA/FNS carried out an integral experiment with a thick beryllium assembly with DT neutrons 30 years ago. It has been reported to date that analyses of this experiment largely overestimate the measured data sensitive to low energy neutrons even if the latest nuclear libraries are used, though they rather agree with the measured data sensitive to neutrons above 1 MeV.Recently, the European Spallation Source group produced new thermal neutron scattering law data of beryllium with different crystallite sizes, whose cross sections were different due to the extinction effect. In this study, we adopted the thermal neutron scattering law data of beryllium with different crystallite sizes for the analysis of the JAEA/FNS beryllium experiment with MCNP-6.20 and JENDL-5. As a result, the overestimation of the measured data sensitive to low energy neutrons decreased with increasing crystallite sizes. It demonstrates that the thermal neutron scattering law data of beryllium without the extinction effect cause the overestimation.In this study, we also found another issue on beryllium. The calculated reaction rates of the 115In(n,n’)115mIn reaction sensitive to neurons above 350 keV are clearly different among JENDL-5, JEFF-3.3 and FENDL-3.2c. We also examined this issue and specified that the secondary neutron spectrum in the (n,2n) reaction caused the discrepancy.The secondary neutron production data in the (n,2n) reaction of 9Be should be revised and the thermal neutron scattering law data of beryllium considering the extinction effect should be added to the next FENDL. | |||||||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||||||
| 内容記述 | Fusion Neutronics Meeting 2025: ITER and beyond | |||||||||
| 発表年月日 | ||||||||||
| 日付 | 2025-04-08 | |||||||||
