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35 巻, 3 号
選択された号の論文の4件中1～4を表示しています
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行待 武生, 黒田 勲, 赤崎 貫志, 新林 栄一, 河野 龍太郎, 大塚 勉, 吉村 貞紀, 久保田 龍治, 氏田 博士, 可部谷 哲治, ...1993 年 35 巻 3 号 p. 179-202
発行日: 1993/03/30
公開日: 2010/04/19
ジャーナル フリーPDF形式でダウンロード (12275K) -
稲垣 嘉之, 宮本 喜晟, 中島 玉雄, 上妻 強志1993 年 35 巻 3 号 p. 227-236
発行日: 1993/03/30
公開日: 2010/04/19
ジャーナル フリーAn experimental study was carried out to clarify the inspection performance of an eddy current probe for the inservice inspection of the intermediate heat exchanger (IHX) tubes of the high-temperature engineering test reactor. Test tubes were made of the same material (Hastelloy XR) and dimensions as those of the IHX, and had artificial discontinuities with reference to the standards of steam generator tubes in ASME Boiler and Pressure Vessel Code which were conservative for the IHX tubes. It was confirmed that the inspection performance of the probe satisfied the ASME standards in the base metal. The probe also could detect discontinuities such as a 90° circumferential groove with 0.5mm in width and 20% through from the outer tube surface, and a 100% through-wall hole with 0.5mm in diameter. The inspection performance was lowered for discontinuities in the welded joint, and flat bottom holes with 1.7mm in diameter were not detected. The inspection limit of 90° circumferential grooves with 1.5mm in width, was above 60% in depth for outer surface and 20% in depth for inner surface in the welded joint.抄録全体を表示PDF形式でダウンロード (6081K) -
五十嵐 敏文1993 年 35 巻 3 号 p. 237-244
発行日: 1993/03/30
公開日: 2010/04/19
ジャーナル フリーThe migration of Co through a saturated sand layer was investigated by a column method. Cobalt breakthrough curves and adsorbed Co concentration profiles in the sand layer were measured. The results showed that, under weakly-alkaline conditions, Co adsorption by sand resulted from the reaction between hydrolyzed Co and sand (irreversible adsorption), as well as from the ion exchange between ionic Co and exchangeable cations such as Ca and Mg on the surface of sand (reversible adsorption). Under acidic conditions, the Co adsorption simply resulted from the ion exchange. These two mechanisms were evaluated with equilibrium ion-exchange reactions between Co, Ca and Mg, and a first-order irreversible reaction with respect to the Co concentration. The selectivity coefficient, which is the reversible ion-exchange parameter, and the first-order rate constant, which is the irreversible adsorption parameter, were constant independent of coexisting Ca concentration and the length of sand column when solution pH was unchanged.抄録全体を表示PDF形式でダウンロード (2459K) -
小川 益郎1993 年 35 巻 3 号 p. 245-252
発行日: 1993/03/30
公開日: 2010/04/19
ジャーナル フリーExperiments and numerical analyses on mass transfer in a gas mixure laminar flow through a circular graphite tube accompanied with graghite oxidation were performed to clarify characteristics of graphite corrosion in connection with the primary cooling pipe rupture accident in a high temperature gas cooled reactor. In the experiment, inlet Reynolds numbers ranged from 16 to 320, graphite temperatures from 600 to 1, 050°C and inlet oxygen mass fractions from 10 to 50%. IG-110 and PGX graphites were used. The mass transfer coefficients in the experiment at a high temperature were less than those obtained on the basis of analogy between heat and mass transfer. It was found from the numerical analysis that the reduction of mass transfer coefficient resulted from the injection flow from the wall. The mass fractions of carbon monoxide and carbon dioxide in the experiment were well predicted on the basis of the one-dimensional numerical analysis in which graphite oxidation and carbon monoxide combustion were taken into consideration.抄録全体を表示PDF形式でダウンロード (2556K)
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