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Nakagiri, Toshio; Kase, Takeshi; Kato, Shoichi; Aoto, Kazumi; Takamori, Yuji*
JNC TN9400 2005-016, 27 Pages, 2005/04
JNC-TN9400-2005-016.pdf:1.37MB
To improve the energy efficiency of the thermo-chemical and electrolytic hybrid hydrogen production system, the techniques and electrolysis condition which reduced the voltage loss of sulfurous acid solution electrolysis were surveyed and discussued. As the result of the survey and discussion, a gas diffusion type anode was effective in a reduction of voltage loss, a cathode poisoning by sulfur and a omission of SO
absorption part. A membrane electrode assembly type cathode was expected to reduce a voltage loss because of the minimum distance between membrane and electrode. In the point of voltage loss reduction, a stream type cell was proper to achieve a rapid reaction material supply. It was effective for experimental apparatus with capability in 1L/h hydrogen production to adopt these techniques, because a cell, which adopted these techniques, achieved a current density of more than 100mA/cm
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Nakagiri, Toshio; Horikiri, Morito; Kato, Shoichi; Kase, Takeshi; Aoto, Kazumi; Takamori, Yuji*; Fukasaku, Hiroshi*
JNC TN9400 2004-056, 98 Pages, 2004/09
JNC-TN9400-2004-056.pdf:5.58MB
Hydrogen production demonstration experiments from water by the thermochemical and electrolytic hybrid hydrogen production process were performed. The feasibility of this hydrogen production process was demonstrated and technical problems to operate longer uration and to develop 1Nl/h-H2 production experimental apparatus were extracted. (1) Continuous and stable hydrogen and oxygen generation by the hybrid process was measured in the four full process experiments and maximum test duration was about five hours. The generation rate of hydrogen and oxygen calculated from measured current in four full process experiments were 4.03ml/h - 5.04ml/h and 2.07ml/h - 2.78ml/h, respectively. The total amounts of generated hydrogen and oxygen in the four experiments were 35.00ml and 20.99ml. (2) Severe material corrosion was not observed for gold plated stainless steel and S03 electrolysis cell (YSZ, Pt paste electrode) which used in sulfuric acid atmosphere at about 550 deg-C, and ionic oxygen conductivity of YSZ did not decrease in the experiments. Nevertheless, corrosion of the gold plated outlet piping of S03 electrolysis cell was observed, and the corrosion by condensed sulfuric acid as suspected. (3) Technical problems to operate the present experimental apparatus for 100 hours and to develop test apparatus to generate 1Nl/h hydrogen, were extracted.
Odaka, Susumu; Kato, Shoichi; Kawakami, Tomohiro*; Suzuki, Takaichi*; Takamori, Yuji*
JNC TN9450 2003-002, 962 Pages, 2003/03
JNC-TN9450-2003-002.pdf:35.27MB
Material test of SUS304 steel, which was used for structure material of fast breeder reactor (FBR) has been preformed in New Technology Development Group. In this report, the result of test obtained up to this time was collected. Many valuable data that long time test more than 100000 hours including sodium environment test data in this report will be use for material examination of FBR in the future. Contents of the data sheet are as follows; (1) Material: SUS304 Steel, (2) Test environment: In air, in sodium, (3) Test temperature: Room temperature to 800
C, (4) Test method: According to JIS and FBR metallic materials test manual (revised edition), (5) Number of data : Tensile tests 1,185 Creep tests 1,044 Fatigue tests 1,037 Creep-fatigue tests 263 Total 3,529 This report consists of the printouts from -the structural material data Processing system, SMAT-.
; Yoshida, Eiichi; Ishigami, Katsuo*; Takamori, Yuji*
JNC TN9400 2003-006, 37 Pages, 2003/02
JNC-TN9400-2003-006.pdf:55.39MB
A high Cr-Mo steel is candidate for a structural materials of future FBR, because of good thermal properties and high creep strength. In this study, fatigue tests were carried out the long-term extrapolation of sodium environmental effects on the mechanical properties of HCM12A (2001-FBR). The exposure to sodium was conducted using a sodium test loop constituted by austenitic steels. For the conditions of in-sodium fatigue test, the sodium temperature was 550C, the oxygen concentration in sodium was about 1ppm and sodium flow rate on the surface of specimen was 1m/second. As results, the low-cycle fatigue lives in sodium were longer than those of in air, which is the same as results of 2
1/4Cr-1Mo steel and Mod.9Cr-1Mo steel, and no strength reduction could be detected. It was considered that the increase of fatigue life in sodium was mainly based on the extension of crack initiation life caused by restrained oxidation of specimen surface. The fatigue life in sodium calculated using usual rule showed good agreement with experimental results.
Takai, Toshihide; Kato, Shoichi; Nakagiri, Toshio; Takamori, Yuji*
no journal, ,
no abstracts in English