日本原子力学会誌
Online ISSN : 2186-5256
Print ISSN : 0004-7120
ISSN-L : 0004-7120
18 巻, 6 号
選択された号の論文の10件中1~10を表示しています
  • 遠山 濶志
    1976 年 18 巻 6 号 p. 325-330
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    現在,トカマク装置が核融合炉実現の最短距離にあり,各国で大型装置建設が進められている。実用炉を考えるとき,β(プラズマの圧力/磁場の圧力)を上げることと不純物問題が重要になってくる。プラズマ断面を縦長にしてβを上げ,ダイバータによって不純物を減らす試みがなされている。本稿では,主に実験的見地から現状を考えてみる。
  • 市川 逵生
    1976 年 18 巻 6 号 p. 331-335
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    最近,原子炉の工学的安全性の観点から精度の高い燃料挙動解析の必要性が認識されてきた。有限要素法は汎用性を持つため,燃料破損に関係の深い種々の変形解析のほか熱的解析にも用いられ,特にペレット・被覆管の力学的相互作用の解析には威力がある。本稿では,被覆管を有する燃料を対象として,有限要素法による燃料挙動解析について述べる。
  • 渡利 一夫, 星野 忠也, 木下 睦, 岩島 清, 本田 嘉秀
    1976 年 18 巻 6 号 p. 336-345
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    原子力開発,それに伴う核燃料再処理工場の稼動,そして低レベル放射性廃液の海洋放出による環境汚染等の問題から放射性Ruの重要性が認識されている。本稿は,放射化学,核燃料再処理,保健物理あるいは海洋放射生態学等の分野における放射性Ruの研究の実情を,それぞれの観点からまとめたものである。
  • 桂山 幸典
    1976 年 18 巻 6 号 p. 346-355
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    Radiation monitoring must has been following characters with be enough its an object. (1) Detectable sensitivity, (2) Energy dependences, (3) Direction characteristics, (4) Stability and durability for all weather, (5) Temperature and atmospheric dependences.
    Since, sensitivity of radiation monitor has been enough to detected of the dose limit (500 mrem/yr) and irregularly effluent release. But recent, there was necessary more than low level sensitivity to be “as low as practicable” that recomendation from ICRP.
    The Japan Atomic Energy Commission was decided “dose objectives in environment of light water power reactor” at May 13, 1975, conform to the report of committee on environment and safety. Thus, the object of environmental radiation monitoring includes “as low as practicable”.
    Numerical values for the “dose objectives” are amount to 5 mrem/yr (total body) and 15 mrem/yr (thyroid) received from both radioactive gaseous and liquid effluents by an individual in the critical groups.
    That is about 0.5 μR/hr, there were smaller than deviation of natural radiation back ground.
    This report was description on technical standardization for measurement of low level radiation in environment.
  • Bernard GUILLEMARD
    1976 年 18 巻 6 号 p. 356-358
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
  • 「欧文誌」投稿者のために
    吉田 正男
    1976 年 18 巻 6 号 p. 359-360
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
  • 90Srの予測濃度分布と実測分布との比較
    井上 頼輝, 森澤 眞輔
    1976 年 18 巻 6 号 p. 366-372
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    In the previous paper, transportation of 90Sr which leached out from cemented solid into a model saturated stratum was experimentally discussed. In this paper, two kinds of techniques were examined for predicting the 90Sr distribution in a model stratum. The first technique consists of numerical solution of a transportation-diffusion equation, which describes the transportation phenomena of 90Sr in the stratum. The second one consists of time-transformation technique which predicts a 90Sr distribution in the stratum based on the distribution of a tracer of water such as tritiated water (HTO).
    Some significant results have been obtained, such as that: (1) The first technique has, at present, some difficulties in predicting a 90Sr distribution. The difference between a predicted and an observed 90Sr distribution should be minimized through taking into consideration local disturbance of stratum characteristics. The mathematical model should also be cheacked on the usefulness for predicting the 90Sr distribution. (2) The 90Sr distribution predicted by using a HTO tracer test agree well with an observed distribution. It takes only about 1/50 of time which would be required for actual distribution of 90Sr in the stratum.
  • 平井 昭司, 垣花 秀武
    1976 年 18 巻 6 号 p. 373-379
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    For the continuous separation of lithium isotopes, a new apparatus has been constructed and operated. In the apparatus the vertical effect of ion exchange chromatography and horizontal effect of ionic electromigration have been combined. A small amount of enriched 6Li was eluted from compartment-2 (the compartment next to the cathode chamber) and a many amount of slightly enriched 7Li was eluted from compartment-12 (the compartment next to anode chamber).
    The ratio of the countercurrent influx of hydrogen ion to the total efflux of lithium ion, R, is a good index for optimizing the operation conditions. If the value of R is less than 0.93, the lithium band in the apparatus moved from the anode side to the cathode side. The apparatus has been operated during 136 days setting the R value between 0.93 and 0.95, and the content of 6Li in lithium chloride obtained from compartment-2 was proved to increase day by day and reached from 7.58 to 8.34 mol/o.
  • 原子炉プラント制御系への適用性の示唆
    萬金 修一, 藤井 義雄, 原 昌雄
    1976 年 18 巻 6 号 p. 380-392
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
    In order to improve the control of an out of pile boiling water loop for testing fuel, a new type of hierarchical control system was developed. The control method consists of a hierarchical control system which has classical P. I. D. sub-loop controllers at the first level and a standard linear optimal regulator at the second level. The design procedure basically consists of two parts. One part is the formulation of the system model which is obtained from the identification experiments, where the system model is determined with the conventional sub-loop controllers included. The other is the design of 2nd level controllers which are constructed based on the standard technique of the linear optimal regulator applied to the system model. Synthesis and evaluation of the control system design have been tested using computer simulation.
    The results of the simulation show that the hierarchical control scheme proposed has performed fairly well in comparison with the conventional one using sub-loop controllers only. We suggest that this control method will be useful for the improvement of the performance of nuclear power plant control and it is attractive because it makes use of conventional controllers and has safety advantages in the case of input-output system failure.
  • 1976 年 18 巻 6 号 p. 394
    発行日: 1976/06/30
    公開日: 2009/03/31
    ジャーナル フリー
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