巻号一覧
後続誌
14 巻, 8 号
選択された号の論文の7件中1～7を表示しています
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今崎 正秀, 野上 暁一1972 年 14 巻 8 号 p. 406-414
発行日: 1972/08/30
公開日: 2010/01/08
ジャーナル フリーWith particular reference to the fundamental mode of Xe oscillation, the characteristic roots of the rational function (two-dimensional analysis) and the transcendental function (one-dimensional analysis) are compared by changing the reactivity coefficient of the moderator. The root-loci of the two analytical methods agree well with each other. Concerning this root-loci, one should note that there are two roots which change very much, and that the stability of the mode is essentially determined by these roots. The cause of the difference of the functional form lies in the thermal system. To confirm the above results, the frequency responses of the thermal system, therefore, were compared between the two methods. Very good agreement was again obtained.
To verify the validity of this modal analysis, the characteristic roots are compared with the time response of the first azimuthal mode obtained at Berkeley power station. The calculated roots roughly agree with the experimental value.
Miida et al. have reported on a case where the frequency responses of the rational function and the transcendental function differ from each other in the high frequency region. An examination of this case revealed that the most important factor is whether or not the angular velocity approaches the essential singular point.抄録全体を表示PDF形式でダウンロード (538K) -
下 道国, 池辺 幸正, 川野 実1972 年 14 巻 8 号 p. 415-421
発行日: 1972/08/30
公開日: 2009/04/21
ジャーナル フリーA study has been made on a method for calibrating the ionization current to be determined when measuring thoron concentration with an ionization chamber. The ionization current generated by the thoron exhausted from RdTh solution would appear to be controlled mainly by the bubbling velocity in the bottle, and the reciprocal of the current is a linear function of the reciprocal of the velocity. The ionization current was calculated from thoron concentration by taking the following three conditions into consideration: (1) loss of ions by columnar recombination, (2) loss of range by the chamber wall, and (3) the condition of the air flow through the chamber. The calibrated and measured values coincided well with each other. Thoron concentrations in the atmosphere were measured on the university campus in Nov. 1968, and the concentration was found to be 0.3-0.6×10-16Ci/cm3 at 1m above the ground surface.抄録全体を表示PDF形式でダウンロード (412K) -
燃料費,重水費最小化のケーススタディ須田 信英, 小江 清1972 年 14 巻 8 号 p. 422-429
発行日: 1972/08/30
公開日: 2009/04/21
ジャーナル フリーIn designing the nuclear reactors there are some independent variables the values of which can be selected by the designer. The power generation cost, for example, depends upon the values of these design parameters and, hence, optimization has to be carried out to find out the value of the parameters for which the cost is minimum. This type of problem has been solved by the designers relying on their engineering judgement. Recent developments in systems engineering would appear to afford a more sophisticated approach to the problem.
In this paper, optimization methods are applied to a problem of this kind; the heavy water moderated, boiling light water cooled reactor has been selected as an example. The cost is too complicated to be described in a closed form and, therefore, analytical methods of optimization are difficult to use. Two typical direct search methods, namely the pattern search method and the simplex method, are applied. Both methods have proved to give reasonably good results. But the cost factor in this problem is multi-modal, and hence sometimes only a local optimum is obtained instead of the global, and a point very close to the optimum is easily discovered, but much computation is required to ascertain that this point is close to, at least a local, optimum.
From the above results it is concluded that these methods are useful for optimizing the reactor design in the stage of "parametric survey", and that if we can develop effective ways to find the global optimum and to ascertain that a point is close to the optimum, then these methods can become even more useful.抄録全体を表示PDF形式でダウンロード (466K) -
飯田 博美1972 年 14 巻 8 号 p. 430-437
発行日: 1972/08/30
公開日: 2009/04/21
ジャーナル フリーICRU Report 19 supersedes ICRU Report 11. The major changes are: (a) introduction of additional quantities particularly in the areas of microdosimetry and radiation protection; and (b) more rigorous definition of the quantities without altering their meaning or range of applicability.
The present article is an interpretative translation of the Report. Certain additional definitions and terms appearing in the Report have been translated into Japanese based on the author's personal judgement.抄録全体を表示PDF形式でダウンロード (506K) -
H. NICKEL1972 年 14 巻 8 号 p. 438-448
発行日: 1972/08/30
公開日: 2009/04/21
ジャーナル フリーThe present status of development of fuels for High-Temperature-Reactors (HTR) in West Germany is briefly reported. The studies on fuel elements for HTR in KFA (Kernforschungsanlage, Jülich) has been mainly concerned with spherical fuel elements for two pebble bed reactors AVR and THTR.
As for the sol-gel procedure to fabricate the fuel kernels for coated particles, particular mention is made of the KFA-H-process, in which the reduction step is not included. Next, the work on the change in the physical and mechanical properties during irradiation, the diffusion behavior of solid fission products and the reduction of gradients of anisotropy and density in PyC-layers are described. Radiation damage in PyC by fast neutrons is also reported.
The results of irradiation tests on spherical fuel elements and their performance are described.
Finally, the results of investigations on the amoeba effect are reported.抄録全体を表示PDF形式でダウンロード (6343K) -
田中 栄一1972 年 14 巻 8 号 p. 449-450
発行日: 1972/08/30
公開日: 2009/04/21
ジャーナル フリーPDF形式でダウンロード (151K) -
伊藤 智之, 新井 貴, 井上 堅司, 大賀 徳道, 太田 充, 河西 敏, 国枝 俊介, 鈴木 紀男, 竹田 辰興, 田島 輝彦, 東井 ...1972 年 14 巻 8 号 p. 451-453
発行日: 1972/08/30
公開日: 2009/04/21
ジャーナル フリーPDF形式でダウンロード (186K)
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