巻号一覧
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30 巻, 6 号
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島本 進, 奥野 清1988 年 30 巻 6 号 p. 488-496
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーIEA (国際エネルギー機関)を中心として進められてきた,核融合用超電導コイルの開発作業“LCT (Large Coil Task)計画”の実験は1987年9月3日に成功裡に終了した。巨大なハードウェアを伴い,かつ10年の年月を投じたこの作業の中で,最大のハイライトである米国オークリッジ国立研究所における実験の内容および評価の展望を紹介する。抄録全体を表示PDF形式でダウンロード (2911K) -
藤原 正巳, 飯吉 厚夫1988 年 30 巻 6 号 p. 497-504
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリー核融合研究は3大トカマク(JT-60, JET, TFTR)の実験が進み,臨界条件に近いプラズマが得られるようになった。次世代トカマクは世界各国それぞれの計画や, ITERのような国際協力による核燃焼目的の研究計画が検討されている。このような時期に我が国の大学の核融合研究の次期計画として,トカマクとは異なる方式の大型ヘリカル装置による研究が大学連合の設計グループで検討されている。それに至る経緯や計画の意義・目的,装置設計等について設計グループで検討されてきた内容の概略を紹介する。抄録全体を表示PDF形式でダウンロード (2384K) -
宮園 昭八郎1988 年 30 巻 6 号 p. 514
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーPDF形式でダウンロード (92K) -
吉田 義輝, 石倉 剛, 岡本 英輔, 長瀬 由幸1988 年 30 巻 6 号 p. 515-517
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーPDF形式でダウンロード (5092K) -
高瀬 和之, 日野 竜太郎, 丸山 創, 宮本 喜晟1988 年 30 巻 6 号 p. 518-525
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーThis study was performed in order to investigate flow-induced vibration characteristics of a fuel rod in HTTR (High Temperature engineering Test Reactor). The fuel rod used this experiment is a graphite fuel rod which simulated a specification of the HTTR's fuel rod. The experiment carried out up to Re=31, 000 using air at room temperature and pressure. Air flowed toward downstream in an annular passage consisted of the fuel rod and the graphite channel. Vibration amplitudes and frequencies of the fuel rod were measured by two noncontact displacement sensors fixed on a side wall of the graphite channel. The following conclusions were drived:
(1) The fuel rod amplitudes increase with a increase of the flow rate and with a decrease of the fuel rod weight.
(2) The fuel rod amplitudes are obtained by δ/De=2.22×10-10Re1.43 (9, 000≤Re≤31, 000), where δ is the vibration amplitude, De the hydraulic diameter and Re Reynolds number.
(3) The fuel rod frequencies shift from lower natural frequency to higher as the flow rate increases.抄録全体を表示PDF形式でダウンロード (4475K) -
隈部 功, 桑折 範彦, 松木 保浩, 杉崎 昌和, 一木 武典1988 年 30 巻 6 号 p. 526-530
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーAn on-line measurement system was designed and constructed for low level tritium gas. The system consists of a proportional counter, amplifiers, a discriminator and a scaler interfaced to a micro-computer. Characteristics of the proportional counter were examined for pure He and Ar counting gases using 5.9 keV 55Fe X-rays; it worked with pure rare gases in the proportional mode up to the gas multiplication factor of about 100. The developed system was used to measure the release rate of tritium out of Al-Mg-Li alloys irradiated by thermal or 14 MeV neutrons. Applicability of the system with a proportional counter has been confirmed for measurements of low level tritium gas carried by pure He or Ar gas. The system has the maximum sensitivity of 0.1 pCi/cm3 for a 50 cm3 sensitive volume.抄録全体を表示PDF形式でダウンロード (400K) -
加藤 清, 森下 悟, 手嶌 孝弥, 刈田 陽一1988 年 30 巻 6 号 p. 531-538
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーAt the Tokai Research Establishment of Japan Atomic Energy Research Institute, the radioactive solid waste incineration unit with a capacity of 100 kg/h was installed in 1979, since then the unit has been routinly operated. An off-gas cleaning system of the unit consists mainly of a primary and secondary ceramic filters, a heat resistant HEPA filter and a scrubber. A series of hot test was carried out to examine the decontamination performance for radionuclides in the off-gas cleaning system. In the test, simulated wastes contaminated with a known quantity of radionuclides were burned in the unit, and radioactive concentrations in the off-gas were measured. And then, the following data were obtained: a retention factor of radionuclides in a furnace and a decontamination factor for radionuclides in each of off-gas cleaning components. And also overall decontamination factors, defined as the ratio of radioactivities input to the furnace to radioactivities passed through outlet of the HEPA filter, were 9×106(2×107) or more for 58Co (60Co), 1×102 for 75Se, 4×104 for 106Ru and 1×108 or more for 134Cs.抄録全体を表示PDF形式でダウンロード (636K) -
直スリット,段付きスリット,段付き円柱プラグ付き遮蔽壁について山路 昭雄1988 年 30 巻 6 号 p. 539-547
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーA design method is described for the Fe compensational shield which is located around the air gap of a straight slit, crank slit and cylindrical crank plug in concrete shield wall against γ-radiation to compensate the lowering of shielding efficiency caused by these shield irregularities. The characteristic of this method is to compensate the lowering of shielding efficiency without increasing the concrete wall thickness and to determine the dimensions of the compensational shield using the densities of the concrete and Fe, the gap width of the irregularity and the concrete wall thickness independing on the incident γ-ray energy. The shielding calculations of the concrete wall with the Fe compensational shield have been performed using a multigroup single scattering code G33-GP with the gap widths of 0.5 cm for straight slit, and 3 cm for crank slit and cylindrical crank plug, the wall thicknesses of 75 cm and 150 cm, and various incident angles of parallel broad beam with γ-ray energies of 0.8 and 2 MeV, respectively. The calculations have showed that the shielding performance of these walls with the compensational shield is better than that of the bulk shield walls抄録全体を表示PDF形式でダウンロード (2859K) -
計算精度および計算時間について面積積分法との比較幾島 毅, 鈴木 邦彦, 吉田 一1988 年 30 巻 6 号 p. 548-556
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーIt is necessary to obtain the radiation geometric view factor for calculation of radiation heat transfer problems. There are many studies for calculation methods of the view factors such as area integration method, line integration method, Mitalas-Stephenson's contour integration method, Hottel's cross-string method and Monte Carlo method. The view factors can be calculated by area integration method and Monte Carlo method, even if third surface shading exists.
The paper is comparative study of the calculation accuracy and computer time between area integration method and Monte Carlo method for view factors. It has been considered that Monte Carlo method is time consuming. However it is clarified from the calculation results of Monte Carlo method that a small amount of emission leads to reasonable view factors and small amount of emission leads to reasonable view factors and small amount of computer time.抄録全体を表示PDF形式でダウンロード (678K) -
1988 年 30 巻 6 号 p. 573
発行日: 1988/06/30
公開日: 2009/03/31
ジャーナル フリーPDF形式でダウンロード (120K)
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