JOPSS - Search Results

Journal Articles

Development of a miniature electromagnet probe for the measurement of local velocity in heavy liquid metals

Ariyoshi, Gen; Obayashi, Hironari; Sasa, Toshinobu

Journal of Nuclear Science and Technology, 59(9), p.1071 - 1088, 2022/09

https://doi.org/10.1080/00223131.2022.2030824

Times Cited Count：1 Percentile：29.26(Nuclear Science & Technology)

Electromagnetic induction method is one of the effective techniques for local velocity measurement in heavy liquid metals. Ricou and Vives' probe and Von Weissenfluh's probe are famous instrumentations using a permanent magnet. However, sensitivity and measurement volume of the probes show unexpected variation since demagnetization of the magnet is occurred by temperature increase up to the Curie temperature. In this study, electromagnetic probe incorporating a miniature electromagnet was newly developed to overcome such unexpected variation. The diameter and the length of the sensor was 6 mm and 155 mm, respectively. The sensitivity and the measurement volume of the probe were assessed by measurement of local velocity of flowing mercury in a square channel. To clarify the validity for the measured velocity profiles, numerical velocity profiles were calculated and compared with experiment. And the validity for the measured velocity profiles were confirmed by calculated result.

Journal Articles

Establishment of integrity evaluation method for Reserved Shutdown System of High-Temperature engineering Test Reactor (HTTR)

Hamamoto, Shimpei; Kawamoto, Taiki; Kondo, Makoto; Sawahata, Hiroaki; Takada, Shoji; Shinozaki, Masayuki

Nihon Genshiryoku Gakkai Wabun Rombunshi, 15(2), p.66 - 69, 2016/06

https://doi.org/10.3327/taesj.J15.016

High Temperature engineering Test Reactor (HTTR) has the reactivity control system which is accompanied with the Reserved Shutdown System (RSS). The RSS consists of B $_{4}$ C/C pellets, guide tube, electric plug, motor which contains brake and reducer, and so on. In accidents when the control rods cannot be inserted, an electric plug is pulled out by motor and the B $_{4}$ C/C pellets fall into the core by gravity. It was revealed that the motor in the RSS drive mechanism did not work as the result of pre-start up checks as described followings: (1) The oil which was separated from a grease of motor reducer flowed down from gap of oil seal, (2) the separated oil penetrated into the brake, (3) the penetrated oil was mixed with abrasion powder released from brake disk, finally, (4) the adhesive mixture blocked the rotation of the motor. A new evaluation method was proposed to detect a sign of the motor sticking. Through the overhaul inspection of all RSS drive mechanisms of HTTR, it was revealed that the proposed method was effective to evaluate the integrity of the RSS drive mechanism.

Journal Articles

Magnetic structure and successive phase transition in NpRhGa $_{5}$

Jonen, Shintaro; Metoki, Naoto; Honda, Fuminori; Kaneko, Koji; Aoki, Dai*; Homma, Yoshiya*; Yamamoto, Etsuji; Haga, Yoshinori; Shiokawa, Yoshinobu; Onuki, Yoshichika

Physica B; Condensed Matter, 378-380, p.1018 - 1020, 2006/05

https://doi.org/10.1016/j.physb.2006.01.503

Times Cited Count：7 Percentile：35.05(Physics, Condensed Matter)

The magnetic structure of NpRhGa has been investigated by neutron scattering. NpRhGa exhibits two antiferromagnetic phases with transition temperatures at T $_{N1}$ = 36 K and T $_{N2}$ = 33 K. Neutron scattering experiments revealed an antiferromagnetic structure with propagation vector q = (0 0 1/2) for both, where the Np magnetic moments are oriented parallel to the c-axis for T $_{N2}$ T T $_{N1}$ and parallel to the [110] direction on basal plane for T T $_{N2}$ . At T $_{N2}$ the reorientation of magnetic moments is accompanied by a sudden increase of magnetic moments, indicative of the first order transition. The magnetic form factor revealed a dominant contribution of the orbital moments.

JAEA Reports

Abstracts of the Workshop on Orbital Ordering and Fluctuations in d- and f-electron Systems; March 4-6, 2002, ASRC, JAERI, Tokai, Japan

Ueda, Kazuo; Hotta, Takashi

JAERI-Review 2002-037, 31 Pages, 2002/12

JAERI-Review-2002-037.pdf:2.7MB

Strongly correlated f- and d-electron systems including heavy Fermion systems and transition metal oxides are important source of exciting new phenomena in condensed matter physics. Recently it has been recognized in more profound way that the orbital degeneracy of the f- and d-electrons plays very important role underlying those exotic phenomena. The idea of the present workshop is to bring active researchers in the field together and to exchange ideas in informal atmosphere. In the workshop many interesting results were presented and stimulating discussions were made as clearly seen by the present report.

JAEA Reports

Design concept of radiation control system for the high intensity proton accelerator facility

Miyamoto, Yukihiro; Ikeno, Koichi; Akiyama, Shigenori*; Harada, Yasunori

JAERI-Tech 2002-086, 43 Pages, 2002/11

JAERI-Tech-2002-086.pdf:5.7MB

Description is given for the characteristic radiation environment for the High Intensity Proton Accelerator Facility and the design concept of the radiation control system of it. The facility is a large scale accelerator complex consisting of high energy proton accelerators carrying the highest beam intensity in the world and the related experimental facilities and therefore provides various issues relevant to the radiation environment. The present report describes the specifications for the radiation control system for the facility, determined in consideration of these characteristics.

JAEA Reports

Conceptual design of solid breeder blanket system cooled by supercritical water

Enoeda, Mikio; Ohara, Yoshihiro; Akiba, Masato; Sato, Satoshi; Hatano, Toshihisa; Kosaku, Yasuo; Kuroda, Toshimasa*; Kikuchi, Shigeto*; Yanagi, Yoshihiko*; Konishi, Satoshi; et al.

JAERI-Tech 2001-078, 120 Pages, 2001/12

JAERI-Tech-2001-078.pdf:8.3MB

This report is a summary of the design works, which was discussed in the design workshop held in 2000 for the demonstration (DEMO) blanket aimed to strengthen the commercial competitiveness and technical feasibility simultaneously. The DEMO blanket must supply the feasibility and experience of the total design of the power plant and the materials. This conceptual design study was performed to determine the updated strategy and goal of the R&D of the DEMO blanket which applies the supercritical water cooling proposed in A-SSTR, taking into account the recent progress of the plasma research and reactor engineering technology.

Journal Articles

CS model coil test facility

Kato, Takashi; Nakajima, Hideo; Isono, Takaaki; Hamada, Kazuya; Kawano, Katsumi; Sugimoto, Makoto; Nunoya, Yoshihiko; Koizumi, Norikiyo; Matsui, Kunihiro; Oshikiri, Masayuki*; et al.

Teion Kogaku, 36(6), p.315 - 323, 2001/06

https://doi.org/10.2221/jcsj.36.315

no abstracts in English

JAEA Reports

Control software of a variably polarizing undulator (APPLE type) for SX beamline in the SPring-8

Hiramatsu, Yoichi*; Shimada, Taihei*; Miyahara, Yoshikazu*

JAERI-Tech 99-082, p.274 - 0, 1999/12

JAERI-Tech-99-082.pdf:7.81MB

no abstracts in English

Journal Articles

Monitoring of superconducting magnet system using fuzzy theorem

*; Ninomiya, Akira*; *; Shigoka, Takeshi*; Takahashi, Yoshikazu; Koizumi, Norikiyo; Nishi, Masataka; Tsuji, Hiroshi

IEEE Transactions on Applied Superconductivity, 5(2, Part1), p.469 - 472, 1995/06

no abstracts in English

JAEA Reports

Properties of the transfer matrices of deflecting magnet systems for free electron laser

Takao, Masaru*

JAERI-M 92-211, 12 Pages, 1993/01

JAERI-M-92-211.pdf:0.48MB

no abstracts in English

Journal Articles

Construction of the JAERI AVF cyclotron

Arakawa, Kazuo; Nakamura, Yoshiteru; Yokota, Wataru; Fukuda, Mitsuhiro; Kamiya, Tomihiro; Agematsu, Takashi; Nara, Takayuki; *; Ishibori, Ikuo; Tanaka, Ryuichi; et al.

Proc. of the 4th China-Japan Joint Symp. on Accelerators for Nuclear Science and Their Applications, p.173 - 175, 1991/00

no abstracts in English

Journal Articles