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Miyahara, Naoya; Miwa, Shuhei; Gou
llo, M.*; Imoto, Jumpei; Horiguchi, Naoki; Sato, Isamu*; Osaka, Masahiko
Journal of Nuclear Science and Technology, 57(12), p.1287 - 1296, 2020/12
Times Cited Count：5 Percentile：52.81(Nuclear Science & Technology)In order to clarify the cesium iodide (CsI) transport behavior with a focus on the mechanisms of gaseous iodine formation in the reactor coolant system of LWR under a severe accident condition, a reproductive experiment of CsI transport behavior was conducted using a facility equipped with a thermal gradient tube. Various analyses on deposits and airborne materials during transportation could elucidate two mechanisms for the gaseous iodine formation. One was the gaseous phase chemical reaction in Cs-I-O-H system at relatively high-temperature region, which led to gaseous iodine transport to the lower temperature region without any further changes in gas species due to the kinetics limitation effects. The other one was the chemical reactions related to condensed phase of CsI, namely those of CsI deposits on walls with surface of stainless steel to form Cs
CrO
compound and CsI aerosol particles with steam, which were newly found in this study.
Miyahara, Naoya; Miwa, Shuhei; Nakajima, Kunihisa; Osaka, Masahiko
Proceedings of 2017 Water Reactor Fuel Performance Meeting (WRFPM 2017) (USB Flash Drive), 9 Pages, 2017/09
This paper presents the development of a reproductive experimental setup for FP release and transport and an analysis tool considering chemical reaction kinetics for the construction of the FP chemistry database. The performance test of the reproductive experimental setup TeRRa using CsI compounds show that TeRRa can reproduce well a FP chemistry-related behavior such as aerosol formation, growth and deposition behavior. An analytical tool has been developed based on the commercial ANSYS-FLUENT code. Some additional models was added to evaluate detailed FP chemistry during release and transport in this study. A test analysis simulating the CsI heating test in steam atmosphere was carried out to demonstrate the performance of the improved code. The result shows the appropriateness of the additional models.
Takeyama, Akinori; Yamamoto, Shunya; Yoshikawa, Masahito; Ito, Hiroshi
Japanese Journal of Applied Physics, Part 1, 44(1B), p.750 - 753, 2005/01
Times Cited Count：0 Percentile：0(Physics, Applied)Pyramid shaped Cu precipitates were formed on Si (100) surface as a result of 200 keV Cu ion implantation and subsequent annealing. Then, ZnO nanorods were successfully synthesized on the Cu implanted substrates by chemical vapor transport (CVT). Hexagonal shaped nanorods with a diameter of 200 nm were grown nearly perpendicular to the Cu implanted substrate and their average density was increased as increasing that of Cu precipitates. The facts strongly indicate the Cu precipitates served as the catalytic particles for the growth of ZnO rods.
Kubo, Hirotaka; Takenaga, Hidenobu; Nakano, Tomohide; Higashijima, Satoru; Shimizu, Katsuhiro; Sawada, Keiji*; Kobayashi, Shinji*; JT-60 Team
Nuclear Fusion Research; Springer Series in Chemical Physics, Vol.78, p.121 - 134, 2004/11
no abstracts in English
Nishizawa, Masato*; Chino, Masamichi
Taiki Kankyo Gakkai-Shi, 39(1), p.31 - 42, 2004/01
no abstracts in English
Nagano, Tetsushi; Yanase, Nobuyuki; Tsuzuki, Katsunori; Nagao, Seiya*
Environment International, 28(7), p.649 - 658, 2003/01
Times Cited Count：29 Percentile：52.26(Environmental Sciences)In order to investigate the role of suspended particulate matter (SPM) in fluvial discharge of trace and major elements in the Kuji River, Japan, the SPM concentrations in the river water and chemical compositions of SPM were analyzed together with the dissolved form concentrations. The SPM concentrations increased by 2 or 3 orders of magnitude with the water discharge, and also had seasonal variations. The suspended species have the key role in transport of some trace and major elements in some fluvial environments and hence should be taken into account in estimating the total discharge through the river waters.
; *
JAERI-M 86-158, 58 Pages, 1986/11
no abstracts in English
Wang, Q. M.*; Hu, Q.*; Zhao, C.*; Zhang, T.*; Fukatsu, Yuta; Tachi, Yukio
no journal, ,
