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1 巻, 5 号
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市野 市郎, 大村 達郎, 鴇沢 正道, 安藤 博1959 年 1 巻 5 号 p. 289-298
発行日: 1959/10/30
公開日: 2009/02/12
ジャーナル フリーIn the design of nuclear reactor, careful consideration should be taken for the various radiation effects on the structural materials. The most important effect among them is radiation damage of the structural materials caused by bombardment of fast neutrons and gamma-ray, and gamma-ray heating of the pressure vessel. This paper is a summary of a series of calculation which has been developed by our group.
A boilng water reactor of about 10, 000kW electrical output is selected as an object of this study.
The calculations are composed of' the following items;
(1) Estimation of neutron flux in the core
(2) Estimation of neutron flux out of the core
(3) Estimation of gamma-ray flux
(4) Gamma-ray heating of pressure vessel
In this paper (Part-1), outline of above calculations is discussed and the further detailed results will be given in the subsequent papers.抄録全体を表示PDF形式でダウンロード (488K) -
石森 富太郎, 梅沢 弘一, 渡辺 賢寿1959 年 1 巻 5 号 p. 299-303
発行日: 1959/10/30
公開日: 2009/03/27
ジャーナル フリーDuring the solvent extraction studies on zirconium and niobium in the system of TBP-hydrochloric acid solution, it was found that both elements are extracted with very diluted TBP in toluene from 810N hydrochloric acid.
Extraction with 1% TBP in toluene from 8-10N hydrochloric acid provides a nice method for the separation of zirconium and niobium from the slow neutron fission products of uranium.
(1) A synthetic mixture was prepared by adding 95Zr-95Nb into an old fission products solution. From the mixture, 95Zr-95Nb was recovered by 1% TBP extraction from 10N hydrochloric acid.
(2) The fission products of uranium, irradiated in JRR-1 for 2 hr and cooled for one day, was dissolved in 8N hydrochloric acid and shaken with 1% TBP. The zirconium and niobium extracted were stripped from the organic phase with 0.5N hydrochloric acid.
(3) Starting from a mixture of 95Zr-95Nb, 141Ce and small amounts of other fission products, 95Zr-95Nb was isolated by a similar extraction from 10N acid.
This method is supposed to be a handy method for the cleaning up of 95Zr-95Nb tracer.抄録全体を表示PDF形式でダウンロード (240K) -
中山 隆, 磯田 和男1959 年 1 巻 5 号 p. 304-307
発行日: 1959/10/30
公開日: 2009/02/12
ジャーナル フリーFor the study of asymptotic properties of the Placzek Function, it seems resonable that the application of the renewal theory, which has been developed by Feller and others, is useful. In this report, the slowing-down process of neutrons in an infinite homogeneous medium is analyzed by the use of the results of the renewal theory. Though more detail investigations are needed, we believe that this mathematical model is one of the efficient methods.抄録全体を表示PDF形式でダウンロード (173K) -
細井 潤三, 中条 金兵衛, 佐治 健次郎, 本間 栄五郎1959 年 1 巻 5 号 p. 308-318
発行日: 1959/10/30
公開日: 2009/03/27
ジャーナル フリーInformation is sought on some thermal properties of various concretes made of domestic raw materials for radiation shields of a power reactor and of a high-flux research reactor. The present paper briefly describes the results of measurements of thermal expansion coefficient, specific heat, thermal diffusivity, thermal conductivity, cyclical heating and cooling durability and further some considerations of relationship between the thermal properties and the durability together with several photographs of the concretes.
In general, it is shown that the heating and cooling durability of such a concrete as has a large thermal expansion coefficient or a considerable difference between the thermal expansion of coarse aggregate and the one of cement mortar part or aggregates of lower strength is very poor. And the decreasing rates of bending strength and of dynamical modulus of elasticity and the residual elongation of the concrete tested have interesting relations with the modified thermal stress resistance factor containing a ratio of bending strength and thermal expansion coefficient and it seems that it depends on the conditions of heat transfer on the surface of the test piece and furthermore, in practice, of heat release in the concrete shield whether a controlling factor over the durability is thermal expansion coefficient or difference of the thermal expansions of the coarse aggregate and of the cement mortar part.抄録全体を表示PDF形式でダウンロード (2832K) -
ウラン燃料要素に関する研究, (2)武谷 清昭, 佐々木 吉方, 栗原 正義1959 年 1 巻 5 号 p. 319-329
発行日: 1959/10/30
公開日: 2009/02/12
ジャーナル フリーThe preliminary study on rolling of uranium metal and some properties of the rolled uranium specimens are reported in this paper. The bomb reduced uranium, melted in vacuum high frequency furnace, are rolled at room temperature, 300° and 600°C. Microstructures and hardnesses of these rolled uranium specimens are shown. The thermal expansion coefficients of two specimens, cut from rolled uranium perpendicular and parallel to the rolling direction respectively, are measured by dilatometer, comparing the two coefficients of them, and then it is found that the rolled uranium at 600°C has the minimum anisotropic expansion coefficient and the one rolled at room temperature has the maximum. The X-ray diffraction patterns on the rolling plane are taken on the sample heat-treated successively for 5 min at every 20°C interval from 670° to 760°C, and from that patterns, the specimen in which (020) is not observed but (002) is predominent, changes its crystal orientation structure, increasing (020) and decreasing (002). The higher is the temperature of treatment, the more at random and graingrowthed is obtained after the heat treatment.抄録全体を表示PDF形式でダウンロード (6173K) -
川畑 幸夫1959 年 1 巻 5 号 p. 330-339
発行日: 1959/10/30
公開日: 2009/03/27
ジャーナル フリーDuring the past one year, a special commission which was established in May 1958 has made the observations of atmospheric diffusion at Tokai-mura where an electric plant of atomic energy will be constructed in the near future.
For this purpose the commission has, in the first place, examined the nature of Pbl2 particles in detail, and then measured its diffusion from a stack of 65m height.
The results of observations show a good agreement with those of computations which are obtained by using the empirical formula which is being used by the Royal Meteorological Office and Atomic Energy Cooperation of England at least to the distance of about 5km from the stack. After the verification of these facts, the commission has computed the diffusion using the above formula, and ascertained that the distance where monthly mean or annual mean density is the largest is about 15km from the stack, and the largest density for monthly mean value and annual mean values are about2×10-8 and 2×10-9 respectively compared to the unit density at the stack.
Here, the author expresses his sincere gratitude to Dr. G. D. Robinson of Meteorological Office of London who has given him many valuable suggestions, and also to the member of the commission for kind cooperation in this study.抄録全体を表示PDF形式でダウンロード (1573K) -
1959 年 1 巻 5 号 p. 340-342
発行日: 1959/10/30
公開日: 2009/02/12
ジャーナル フリーPDF形式でダウンロード (2064K) -
1959 年 1 巻 5 号 p. 342a
発行日: 1959年
公開日: 2009/02/12
ジャーナル フリーPDF形式でダウンロード (572K) -
1959 年 1 巻 5 号 p. 342b
発行日: 1959年
公開日: 2009/02/12
ジャーナル フリーPDF形式でダウンロード (572K)
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