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Journal Articles

Research and examination of seismic safety evaluation and function maintenance for important equipment in nuclear facilities

Furuya, Osamu*; Fujita, Satoshi*; Muta, Hitoshi*; Otori, Yasuki*; Itoi, Tatsuya*; Okamura, Shigeki*; Minagawa, Keisuke*; Nakamura, Izumi*; Fujimoto, Shigeru*; Otani, Akihito*; et al.

Proceedings of ASME 2021 Pressure Vessels and Piping Conference (PVP 2021) (Internet), 6 Pages, 2021/07

Since the Fukushima accident, with the higher safety requirements of nuclear facilities in Japan, suppliers, manufacturers and academic societies have been actively considering the reconstruction of the safety of nuclear facilities from various perspectives. The Nuclear Regulation Authority has formulated new regulatory standards and is in operation. The new regulatory standards are based on defense in depth, and have significantly raised the levels of natural hazards and have requested to strengthen the countermeasures from the perspective of preventing the simultaneous loss of safety functions due to common factors. Facilities for dealing with specific serious accidents are required to have robustness to ensure functions against earthquakes that exceed the design standards to a certain extent. In addition, since the probabilistic risk assessment (PRA) and the safety margin evaluation are performed to include the range beyond the design assumption in the safety improvement evaluation, it is very important to extent the special knowledge in the strength of important equipment for seismic safety. This paper summarizes the research and examination results of specialized knowledge on the concept of maintaining the functions of important seismic facilities and the damage index to be considered by severe earthquakes. In the other paper, the study on reliability of seismic capacity analysis for important equipment in nuclear facilities will be reported.

Journal Articles

Identification of hydrogen species on Pt/Al$$_{2}$$O$$_{3}$$ by ${it in situ}$ inelastic neutron scattering and their reactivity with ethylene

Yamazoe, Seiji*; Yamamoto, Akira*; Hosokawa, Saburo*; Fukuda, Ryoichi*; Hara, Kenji*; Nakamura, Mitsutaka; Kamazawa, Kazuya*; Tsukuda, Tatsuya*; Yoshida, Hisao*; Tanaka, Tsunehiro*

Catalysis Science & Technology, 11(1), p.116 - 123, 2021/01

 Times Cited Count:6 Percentile:32.25(Chemistry, Physical)

Journal Articles

Gamma-ray glow preceding downward terrestrial gamma-ray flash

Wada, Yuki*; Enoto, Teruaki*; Nakamura, Yoshitaka*; Furuta, Yoshihiro; Yuasa, Takayuki*; Nakazawa, Kazuhiro*; Morimoto, Takeshi*; Sato, Mitsuteru*; Matsumoto, Takahiro*; Yonetoku, Daisuke*; et al.

Communications Physics (Internet), 2(1), p.67_1 - 67_9, 2019/06

 Times Cited Count:49 Percentile:92.92(Physics, Multidisciplinary)

Journal Articles

Thermal-hydraulics technological strategy roadmap 2017; An Approach for continuous safety improvement of LWRs

Itoi, Tatsuya*; Iwaki, Chikako*; Onuki, Akira*; Kito, Kazuaki*; Nakamura, Hideo; Nishida, Akemi; Nishi, Yoshihisa*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 60(4), p.221 - 225, 2018/04

no abstracts in English

Journal Articles

Formulation of nuclear safety under various induced events, 2; Bases and implementation of countermeasures against external events

Itoi, Tatsuya*; Nakamura, Hideo; Nakanishi, Nobuhiro*

Nihon Genshiryoku Gakkai-Shi ATOMO$$Sigma$$, 58(5), p.318 - 323, 2016/05

no abstracts in English

Journal Articles

Analysis on effects of transverse electric field in an injector cavity of compact-ERL at KEK

Hwang, J.-G.*; Kim, E.-S.*; Miyajima, Tsukasa*; Honda, Yosuke*; Harada, Kentaro*; Shimada, Miho*; Takai, Ryota*; Kume, Tatsuya*; Nagahashi, Shinya*; Obina, Takashi*; et al.

Nuclear Instruments and Methods in Physics Research A, 753, p.97 - 104, 2014/07

 Times Cited Count:7 Percentile:48.01(Instruments & Instrumentation)

Oral presentation

Spin nematic susceptibility studied by inelastic neutron scattering in FeSe

Shamoto, Shinichi; Kajimoto, Ryoichi; Ishikado, Motoyuki*; Yamakawa, Yoichi*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Kontani, Hiroshi*; Shibauchi, Takasada*; Matsuda, Yuji*

no journal, , 

no abstracts in English

Oral presentation

Inelastic neutron scattering study of $$beta$$-FeSe

Shamoto, Shinichi; Mori, Michiyasu; Kajimoto, Ryoichi; Kodama, Katsuaki; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Nakamura, Mitsutaka; Shibauchi, Takasada*; Matsuda, Yuji*

no journal, , 

Iron-based superconductor $$beta$$-FeSe has not been studied in the high energy region by inelastic neutron scattering measurement. We have studied it with the single crystals grown by chemical vapor transport method. As a result, spin-wave like dispersion, which can be fitted by two types of anisotropic exchange interactions, is observed up to 200 meV.

Oral presentation

The Emergency safety system of radiation control equipment at the time of all AC-power-supply loss at the Tokai reprocessing plant

Kanazawa, Nobuyuki; Nakamura, Keisuke; Miyauchi, Toru; Chikazawa, Tatsuya*; Kurosawa, Hideaki*; Shiba, Kozo

no journal, , 

no abstracts in English

Oral presentation

Photoluminescence property of nano-composite phases of $$beta$$-FeSi$$_{2}$$ nanocrystals embedded in SiO$$_{2}$$

Tatsumi, Takahide*; Nakamura, Tatsuya*; Morita, Kosuke*; Kobayashi, Hiroyuki*; Narumi, Kazumasa; Maeda, Yoshihito

no journal, , 

no abstracts in English

Oral presentation

Inelastic neutron scattering study of iron-based superconductors FeSe$$_{0.5}$$Te$$_{0.5}$$ and FeSe; Nematic effect of magnetic scattering spectra

Shamoto, Shinichi; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Matsuda, Yuji*; Shibauchi, Takasada*; Arai, Masatoshi*

no journal, , 

Iron-based superconductors FeSe$$_{0.5}$$Te$$_{0.5}$$ and FeSe have been studied by inelastic neutron scattering measurement. In contrast of FeSe, FeSe$$_{0.5}$$Te$$_{0.5}$$ exhibits temperature dependent incommensurability in magnetic spectrum with no clear structural transition. We find a jump in the incommensurability at about 70 K.

Oral presentation

Nematic effect on spin excitations of FeSe$$_{0.5}$$Te$$_{0.5}$$5 and FeSe

Shamoto, Shinichi; Ishikado, Motoyuki*; Watashige, Tatsuya*; Kasahara, Shigeru*; Kodama, Katsuaki; Kajimoto, Ryoichi; Nakamura, Mitsutaka; Shibauchi, Takasada*; Matsuda, Yuji*; Arai, Masatoshi*

no journal, , 

Iron-based superconductors FeSe$$_{0.5}$$Te$$_{0.5}$$ and FeSe have been studied by inelastic neutron scattering measurement. Although FeSe$$_{0.5}$$Te$$_{0.5}$$ does not exhibit any clear structural transition, the incommensurate magnetic excitation shows a jump at about 70 K in the incommensurability. It may suggest that the degeneracy of d$$_{zx}$$ and d$$_{yz}$$ orbitals in FeSe$$_{0.5}$$Te$$_{0.5}$$ is lifted in this temperature range. It can be due to the nematic effect even in FeSe$$_{0.5}$$Te$$_{0.5}$$.

Oral presentation

Oxidation behavior of $$beta$$-FeSi$$_{2}$$/Si nano-composite phases by IR absorption measurements

Morita, Kosuke*; Nakamura, Tatsuya*; Kobayashi, Hiroyuki*; Tatsumi, Takahide*; Narumi, Kazumasa; Maeda, Yoshihito

no journal, , 

no abstracts in English

13 (Records 1-13 displayed on this page)
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