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33 巻, 9 号
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1991 年 33 巻 9 号 p. 818-847
発行日: 1991/09/30
公開日: 2010/04/19
ジャーナル フリーPDF形式でダウンロード (13658K) -
北村 正晴, 田辺 文也1991 年 33 巻 9 号 p. 848-854
発行日: 1991/09/30
公開日: 2010/04/19
ジャーナル フリーPDF形式でダウンロード (503K) -
橋本 憲吾, 仁科 浩二郎1991 年 33 巻 9 号 p. 882-889
発行日: 1991/09/30
公開日: 2010/04/19
ジャーナル フリーThe improved power method in the higher-harmonic eigenvalue calculation of nuclear plant thermal-hydraulic dynamics was applied to the λ- and ωp-eigenvalue problems of thermal and fast reactor systems to obtain the two-dimensional, few-energy-group higher-harmonic eigenvalues and eigenfunctions. As a result, the efficiency of the method was confirmed in the large-scale neutron diffusion problems consisting of the variables amounting to tens of thousands, and the interesting spatial patterns of the eigenfunction were obtained.
Even though a harmonic order may be lower, the discrepancy between λ- and ωp-eigen-functions, which are usually assumed to be approximately identical, is significant in a thermal system with low-absorbing region (e.g. reflector). In the higher ωp-harmonics of the system, zero loci of the eigenfunctions depend on neutron energy groups. Therefore, the particular attention should be paid to placements and energy-response of detectors in the kinetic experiments.抄録全体を表示PDF形式でダウンロード (470K) -
富士および伊豆大島の火山ガラスの風化変質湯佐 泰久, 新井 隆, 亀井 玄人, 高野 仁1991 年 33 巻 9 号 p. 890-905
発行日: 1991/09/30
公開日: 2010/04/19
ジャーナル フリーWeathering alteration of volcanic glass is regarded as a suitable natural analogue for the long-term leaching behavior of radioactive waste glass under conditions of geological disposal. Specimens of basaltic glasses were collected from the Fuji and the Izu-Ohshima pyroclastic fall deposits (280-2, 800yr), and were studied in detail. The following results were obtained;
(1) Climatological conditions have not varied significantly during at least the last three thousand years. Therefore, the temperature, amount and quality of groundwater, were quantitatively estimated from the present meteorological data. (2) The mass balance between the amounts of elements depleted from the glasses and chemical composition of groundwater was examined on this basis and it was found that the cases studied could be regarded as leaching experiments of the glasses by groundwater. (3) The natural alteration products associated with leaching of the volcanic glasses were closely similar to those of laboratory experiments with simulated waste glasses. (4) Although the groundwater was of Ca(Mg)-HCO3 type in the Fuji area, and of Na-Cl type in Izu-Ohshima area, similar values (2-3μm/1, 000yr) were obtained for the alteration rates of the glasses, together with similar values of temperature and water supply rate. (5) The alteration rates decreased with increasing silica content in groundwater.
These results illustrate the validity and usefulness of the natural analogue study for estimation of long-term leaching behavior of waste glass.抄録全体を表示PDF形式でダウンロード (9990K)
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