Sodium-cooled Fast Reactors

Ohshima, Hiroyuki; Morishita, Masaki*; Aizawa, Kosuke; Ando, Masanori; Ashida, Takashi; Chikazawa, Yoshitaka; Doda, Norihiro; Enuma, Yasuhiro; Ezure, Toshiki; Fukano, Yoshitaka; et al.

Sodium-cooled Fast Reactors; JSME Series in Thermal and Nuclear Power Generation, Vol.3, 631 Pages, 2022/07

https://shop.elsevier.com/books/sodium-cooled-fast-reactors/morishita/978-0-12-824076-2

This book is a collection of the past experience of design, construction, and operation of two reactors, the latest knowledge and technology for SFR designs, and the future prospects of SFR development in Japan. It is intended to provide the perspective and the relevant knowledge to enable readers to become more familiar with SFR technology.

An Experimental setup for creating and imaging He excimer cluster tracers in superfluid helium-4 via neutron-He absorption reaction

Sonnenschein, V.*; Tsuji, Yoshiyuki*; Kokuryu, Shoma*; Kubo, Wataru*; Suzuki, So*; Tomita, Hideki*; Kiyanagi, Yoshiaki*; Iguchi, Tetsuo*; Matsushita, Taku*; Wada, Nobuo*; et al.

Review of Scientific Instruments, 91(3), p.033318_1 - 033318_12, 2020/03

https://doi.org/10.1063/1.5130919

Proposal of maintenance management of nuclear power plants at R&D stage by taking account of their features

Takaya, Shigeru; Chikazawa, Yoshitaka; Hayashida, Kiichi; Tagawa, Akihiro; Kubo, Shigenobu; Yamashita, Atsushi

Hozengaku, 15(4), p.71 - 78, 2017/01

A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage was first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. Finally, an example that the proposal was applied to setting maintenance program of sodium-cooled fast reactor was presented.

Detailed structural analysis and dielectric properties of silicon nitride film fabricated using pure nitrogen plasma generated near atmospheric pressure

Hayakawa, Ryoma*; Nakae, Mari*; Yoshimura, Takeshi*; Ashida, Atsushi*; Fujimura, Norifumi*; Uehara, Tsuyoshi*; Tagawa, Masahito*; Teraoka, Yuden

Journal of Applied Physics, 100(7), p.073710_1 - 073710_8, 2006/10

https://doi.org/10.1063/1.2353781

A structural analysis and dielectric property measurements of silicon nitride films fabricated using atmospheric pressure (AP) plasma were carried out, and the results were compared to a radio frequency (RF) plasma case. Using AP plasma, 1.8-nm-thick films composed of SiNO were obtained in the temperature range from 298 to 773 K. X-ray photoelectron spectroscopy and Rutherford backscattering spectrometry revealed 10% more nitrogen atoms corresponding to the NSi bond in the film using AP plasma than those using RF plasma. In the temperature range, the leakage current densities were not affected by the temperature. Films fabricated at 298 K showed leakage current density of as low as 710A/cm at 5MV/cm. This value was one order of magnitude lower than that using RF plasma.

Development of EC H&CD launcher components for fusion device

Takahashi, Koji; Ishitsuka, Etsuo; Moeller, C. P.*; Hayashida, Kazunori*; Kasugai, Atsushi; Sakamoto, Keishi; Hayashi, Kenichi*; Imai, Tsuyoshi

Fusion Engineering and Design, 66-68, p.473 - 479, 2003/09

https://doi.org/10.1016/S0920-3796(03)00076-0

For the purpose to confirm the reliability of the front steering concept, tests of the front steering launcher mock-up and neutron irradiation tests of bearings for a movable mirror were carried out under the ITER conditions. The max. stress of the flexible pipes for the movable mirror was measuerd to be 60MPa, much less than the allowable stress and agree with the calculation. No degradation on the performance of bearings was obtained for the assumed fluence of ITER. The mock-up of remote steering(RS) launcher was tested and RF radiation of 0.5MW-3sec and 0.2MW-10sec over 0-10 were performed. No degradation was obseved, either. The new launcher which has the capability of wider range rf beam steering and the corrugated square waveguide with four miter bends that yield the dog-legged structure has been designed, based on the test results. It has been fabricating for high power experiments.

Comparison of chemical bonding structure at SiN/Si interface fabricated using atmospheric pressure plasma and RF plasma

Hayakawa, Ryoma*; Nakae, Mari*; Yoshida, Shinji*; Tagawa, Masahito*; Teraoka, Yuden; Yoshimura, Takeshi*; Ashida, Atsushi*; Kunugi, Shunsuke*; Uehara, Tsuyoshi*; Fujimura, Norifumi*

no journal, , 

Chemical bonding states of silicon nitride films formed by an atmospheric plasma method and a RF plasma method were analyzed by photoemission spectroscopy with synchrotron radiation and compared each other. The SiN/Si(111) interface formed by the RF plasma method consisted of 5 components. On the other hand, the SiN/Si(111) interface formed by the atmospheric plasma method consisted of 4 components. The SiN component is in the interface formed by the RF plasma method.

Study on maintenance management suitable for NPP at R&D stage, 1; Basic requirements

Takaya, Shigeru; Chikazawa, Yoshitaka; Hayashida, Kiichi*; Tagawa, Akihiro; Kubo, Shigenobu; Yamashita, Atsushi*

no journal, , 

In this paper, a maintenance management suitable to nuclear power plants (NPP) at R&D stage was studied. NPP at R&D stage have several features different from commercial NPP. A maintenance management for NPP at R&D stage should be conducted by taking account of those features. First, objectives of maintenance management of NPP at R&D stage was clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed.

Study on maintenance management suitable for NPP at R&D stage, 2; Case study on piping maintenance

Chikazawa, Yoshitaka; Takaya, Shigeru; Hayashida, Kiichi*; Tagawa, Akihiro; Kubo, Shigenobu; Yamashita, Atsushi*

no journal, , 

A maintenance management suitable to nuclear power plants (NPP) at R&D stage was discussed. Objectives of maintenance management of NPP at R&D stage was first clarified. Next, applicability of codes for maintenance management of commercial NPP to NPP at R&D stage was discussed. Then, requirements and consideration for maintenance management of NPP at R&D stage was proposed. In this paper, an example that the proposal was applied to setting maintenance program of sodium-cooled fast reactor was presented.

A Micro pixel chamber based neutron imaging detector ( NID) with boron converter for energy-resolved neutron imaging at J-PARC

Parker, J. D.*; Shinohara, Takenao; Harada, Masahide; Hayashida, Hirotoshi*; Hiroi, Kosuke; Kai, Tetsuya; Matsumoto, Yoshihiro*; Oikawa, Kenichi; Segawa, Mariko; Su, Y. H.; et al.

no journal, ,