Thermal-hydraulics technological strategy roadmap that improves safety of LWRs

Arai, Kenji*; Umezawa, Shigemitsu*; Oikawa, Hirohide*; Onuki, Akira*; Nakamura, Hideo; Nishi, Yoshihisa*; Fujii, Tadashi*

Nihon Genshiryoku Gakkai-Shi ATOMO, 58(3), p.161 - 166, 2016/03

https://doi.org/10.3327/jaesjb.58.3_161

no abstracts in English

Effects of Pb depositon on pre-covered Ag/Ni(111) surface; Manipulation of growth mode and growth orientation

Ito, Takahiko*; Nakanishi, Shigemitsu*; Umezawa, Kenji*; Yamamoto, Shunya; Narumi, Kazumasa; Naramoto, Hiroshi

JAERI-Review 99-025, TIARA Annual Report 1998, p.182 - 184, 1999/10

https://jopss.jaea.go.jp/pdfdata/JAERI-Review-99-025.pdf

no abstracts in English

Characterization and depth profiling of impurity element nearby tungsten surface using X-ray photoelectron spectroscopy

Kamiura, Yoshitomo*; Umezawa, Kenji*; Teraoka, Yuden; Yoshigoe, Akitaka

no journal, , 

Nitrogen ion beams (N, N) with kinetic energy of 2.5 keV were irradiated to poly W surfaces with thin oxide films at room temperature. The element ratio and depth profile of chemical bonding states for the modified-W surface were analyzed by photoemission spectroscopy with the surface reaction analysis apparatus at the BL23SU in the SPring-8. W4f photoemission spectra were observed using synchrotron radiation of 592 eV for the W surfaces which were irradiated by nitrogen ion beams with the dose of 210 ions/cm. Nitridized W in addition to metal W4f, W4f and their oxidized components were observed. N1s photoemission spectra, which were simultaneously measured, showed a chemical shift in the high energy side. This implies that nitrogen atoms were in the dpper positions.

Study on C-beam-implanted W surface

Umezawa, Kenji*; Kamiura, Yoshitomo*; Teraoka, Yuden; Yoshigoe, Akitaka; Harries, J.

no journal, , 

no abstracts in English

AESJ new thermo-hydraulics roadmap for LWR safety improvement based on lessons-learned from Fukushima Daiichi accident

Nakamura, Hideo; Arai, Kenji*; Oikawa, Hirohide*; Fujii, Tadashi*; Umezawa, Shigemitsu*; Onuki, Akira*; Nishi, Yoshihisa*; Abe, Yutaka*; Sugimoto, Jun*; Koshizuka, Seiichi*; et al.

no journal, , 

Technical issues for safety improvement, 2; Validation of effectiveness of heat removal using SG secondary system in PWR

Onuki, Akira*; Umezawa, Shigemitsu*; Yamada, Hidetomo*; Nishi, Yoshihisa*; Arai, Kenji*; Oikawa, Hirohide*; Fujii, Tadashi*; Nakamura, Hideo

no journal, , 

no abstracts in English

Technical issues for safety improvement, 4; Integrity of containment

Oikawa, Hirohide*; Arai, Kenji*; Fujii, Tadashi*; Umezawa, Shigemitsu*; Nishi, Yoshihisa*; Nakamura, Hideo

no journal, , 

no abstracts in English