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20 巻, 4 号
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土器の年代測定東村 武信, 市川 米太1978 年 20 巻 4 号 p. 224-228
発行日: 1978/04/30
公開日: 2009/04/21
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菱田 久志1978 年 20 巻 4 号 p. 229-235
発行日: 1978/04/30
公開日: 2010/01/08
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平川 隆, 鈴木 忠和, 斎藤 直之1978 年 20 巻 4 号 p. 236-240
発行日: 1978/04/30
公開日: 2009/04/21
ジャーナル フリーCode Center in Nuclear Code Research Committee of Atomic Energy Society of Japan has been performing its activities for ten years since its establishment. Recently, the number of users for nuclear codes has been increasing and their communities are changing remarkably in Japan. Moreover, in the outside of Japan, NEA Computer Program Library (CPL) has amalgamated with Nuclear Data Compilation Center (CCDN) to form new Data Bank 1978 January.
The present report is written to promote the smooth utilization of Code Center considering the above change of circumstances. The history of Code Center, activities of NEA CPL, qualifications and duties of participating the organization and the utilization of Code Center are stated.抄録全体を表示PDF形式でダウンロード (435K) -
藤野 威男1978 年 20 巻 4 号 p. 241-254
発行日: 1978/04/30
公開日: 2010/01/08
ジャーナル フリーIncreased activities in the study on uranates have produced many reports in the recent several years. The basic knowledge of the uranates seems to be useful also for understanding the reaction between UO2 fuel and metallic fission products in reactors.
In this paper, containing recent works, the crystal structures, the methods of preparation, and the physical and chemical properties of these uranates reported are compiled in a table, and the general features are discussed in the text for respective U(VI), U(V) and U(IV) compounds. The object of the description here is limited to the ternary uranates of alkali and alkaline earth elements excluding their hydrates prepared by the wet chemical methods.抄録全体を表示PDF形式でダウンロード (1188K) -
真空容器山本 正弘, 清水 正亜, 中村 博雄, 高津 英幸, 西郷 奉素, 太田 充, 吉川 允二, 伊藤 吉保, 佐藤 弘, 唐津 義憲, 相澤 ...1978 年 20 巻 4 号 p. 258-272
発行日: 1978/04/30
公開日: 2009/04/21
ジャーナル フリーThe vacuum vessel of JT-60, JAERI large tokamak device whose construction has just been started in fiscal year 1977, is a toroidal chamber made from Inconel 625 and consists of eight rigid sectorial rings and U-shaped parallel bellows. It has a major radius of 3m, a non-circular cross section with a bore of 3m and an electric resistance of 1.3mΩ. The ultimate vacuum pressure is less than 10-8 torr. The vessel is loaded by atmospheric pressure and various electromagnetic forces during a discharge at a temperature up to 400°C.
Construction of such a large vacuum vessel as in the JT-60 has never been made in the past and necessitated to undertake a series of research and development (R & D) regarding selection of vacuum vessel materials, manufacture of components, selection of surface treatment technique and methods for analyzing stress, strain, buckling and temperature distribution of the vacuum vessel.
The present R & D was completed and established design and fabrication technique for the construction of the JT-60 vacuum vessel with such satisfactory results that Inconel 625 was selected as the vacuum vessel material, fabrication technique of bellows with a non-circular cross section was established, the availability of the surface treatment technique was verified and a new finite element method specially suited for the stress analysis of such structures was developed.抄録全体を表示PDF形式でダウンロード (4290K) -
高速可動リミタ高嶋 哲夫, 清水 正亜, 太田 充, 水口 忠良, 前田 日出人1978 年 20 巻 4 号 p. 273-281
発行日: 1978/04/30
公開日: 2010/01/08
ジャーナル フリーA pair of fast-acting movable rail limiters are to be installed in the vacuum chamber of JT-60 to suppress skin current in the plasma column. They should travel across the vacuum chamber over a stroke of about 1m in 0.1sec in the build-up phase of the plasma current, Each movable limiter system consists of a drive mechanism, a vacuum seal, a bearing usable at high temperatures in a vacuum, a molybdenum rail limiter head and its auxiliary members. Various engineering problems are involved in constructing such a system because the design specifications outlined above exceed the present technology. A full-scale movable limiter, therefore, was designed, constructed and then put to mechanical, electrical and vacuum-technological tests.
The model features a hydraulic drive mechanism with servovalves to control the oil flow. A special vacuum seal allowing a movement at high speeds was developed. It consists of welded bellows jointed together and connected to a pantograph at the joints. It allows uniform expansion of each bellows at high speeds. Molybdenum disulphide with 20% Ta is chosen as the most suitable bearing material after conducting tests on various bearing materials.
The overall test of the model showed that its specifications were met with satisfactory reliability and reproducibility. Furthermore, the endurance test demonstrated that it functioned reliably over 50, 000 times of operation.抄録全体を表示PDF形式でダウンロード (713K) -
ゼオライトの高温焼成時におけるCsの揮発三村 均, 菅野 卓治1978 年 20 巻 4 号 p. 282-287
発行日: 1978/04/30
公開日: 2009/04/21
ジャーナル フリーVolatilization of Cs from Zeolites at High Temperature By Hitoshi MIMURA and Takuji KANNO Volatilization of Cs from Cs type zeolites and calcined zeolites were studied at high temperature. Synthetic zeolites A, X, Y, synthetic mordenite (Zeolon), natural mordenite and clinoptilolite saturated with Cs were used in this study.
Volatilized Cs from CsX was largest in quantity and from Cs type natural zedlites smallest. Volatilization of Cs was observed at about 800°C and increased as the calcining temperature rose. Volatilized Cs from CsA was smallest in synthetic zeolites. CsA recryStallized to nepheline and pollucite with the ratio of about 1:1 above 1, 000°C and it seemed that the volatilization of Cs from pollucite was suppressde with the nepheline phase surrounded them.
The rate of volatilization was very fast within the initial 10min and very slow after 60min except for CsX. This behavior suggested that the rate was very fast before structural transformation.
The mean volatilization rate of Cs in 3hr from calcined CsX (pollucite) was 1.1×10-4mg/cmcm2·min and the others were 10-5-10-6mg/cmcm2·min. The amount of volatilized Cs in Ar flow was decreased 20-90% of that in air flow. Volatilized species was identified with Cs2O by mass spectrometry.抄録全体を表示PDF形式でダウンロード (451K)
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