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Meguro, Yoshihiro; Ogiyanagi, Jin*; Tomioka, Osamu; Imura, Hisanori*; Ohashi, Kozaburo*; Yoshida, Zenko; Nakashima, Mikio
Proceedings of 2nd International Symposium on Supercritical Fluid Technology for Energy and Environment Applications (Super Green 2003), p.175 - 179, 2004/00
One of the most attractive properties of SFE is that changing solvent properties by tuning pressure can control distribution behavior of a metal ion. Distribution ratio (D) of uranium(VI) and plutonium(IV) with tributyl phosphate (TBP) from a nitric acid solution and palladium(II) with 2-methyl-8-qunolinol (HMQ) from a hydrochloric solution were determined in SFE at various pressures. In the extraction system using TBP, a linear relationship between the logarithmic distribution ratio (log D) and the solubility parameter of CO
was observed. The solubility parameter is difined based on the regular solution theory and is one of the parameters depending on the pressure. On the other hand, a linear relationship with a positive slope between log D and the solubility parameter was observed in the extraction system using HMQ. Most of the extractant was dissolved in the aqueous phase as HMQ
under the extraction condition examined.
*
JNC TN1400 2001-013, 70 Pages, 2001/08
JNC-TN1400-2001-013.pdf:5.13MB
no abstracts in English
Tamura, Kozaburo*; Inui, Masanori*; Funakoshi, Kenichi*; Utsumi, Wataru
Nuclear Instruments and Methods in Physics Research A, 467-468(Part2), p.1065 - 1068, 2001/07
Times Cited Count：4 Percentile：33.81(Instruments & Instrumentation)no abstracts in English
Koshizuka, Seiichi*
JNC TJ9400 2000-011, 102 Pages, 2000/03
JNC-TJ9400-2000-011.pdf:2.71MB
In order to evaluate the possibility to achieve high electric power by a fast reactor with supercritical light water, the design study was carried out on a large fast reactor core with high coolant outlet temperature (SCFR-H). Since the reactor coolant circuit uses once-through direct cycle where all feedwater flows through the core to the turbine at supercritical pressure, it is possible to design much simpler and more compact reactor systems and to achieve higher thermal efficiency than those of current light water reactors. The once-through direct cycle system is employed in current fossil-fired power plants. In the present study, three types of core were designed. The first is SCFR-H with blankets cooled by ascending flow, the second is SCFR-H with blankets cooled by descending flow and the third is SCFR-H with high thermal power. Every core was designed to achieve the thermal efficiency over 43%, positive coolant density reactivity coefficient and electric power over 1600MW. Core characteristics of SCFR-Hs were compared with those of SCLWR-H (electric power: 1212MW), which is a thermal neutron spectrum reactor cooled and moderated by supercritical light water, with the same diameter of the reactor pressure vessel. It was shown that SCFR-H could increase the electric power about l.7 times maximally. From the standpoint of the increase of a reactor thermal power, a fast reactor has advantages as compared with a thermal neutron reactor, because it can increase the power density by adopting tight fuel lattices and eliminating the moderator region. Thus, it was concluded that a reactor cooled by supercritical light water could further improve the cost competitiveness by using a fast neutron spectrum and achieving a higher thermal power.
Tamura, Kozaburo*; Inui, Masanori*; Tsuji, Kazuhiko*; Funakoshi, Kenichi*; Utsumi, Wataru
Nihon Kessho Gakkai-Shi, 42(1), p.33 - 40, 2000/02
no abstracts in English
Kimura, Takaumi
Bunseki, (291), p.246 - 247, 1999/00
no abstracts in English
/supercritical CO-tributyl phosphate systemMeguro, Yoshihiro; ; *; Takeishi, Hideyo; Sasaki, Takayuki*; Yoshida, Zenko
Proc. of Int. Trace Analysis Symp. '98 (ITAS'98), p.25 - 26, 1998/00
no abstracts in English
-diketonates by supercritical fluid chromatographyK.E.Laintz*; Meguro, Yoshihiro; ; Tachikawa, Enzo
J. High Resolut. Chromatogr., 16, p.372 - 375, 1993/06
no abstracts in English
Nohara, Tsuyoshi; Takesue, Norito; Matsumura, Toshihiro*; Nakagiri, Toshio; Takeuchi, Shinji*
no journal, ,
It was reported that traces of high and low permeable zones formed by the supercritical fluid flow through granite have been observed in Japan. These traces directly related to current permeability. In this study, we will improve the investigation methods and evaluation technologies considering the influence of supercritical fluids through case studies in the Ningyo-toge area. In this presentation, we will introduce the research plan and the preliminary results.
