巻号一覧
6 巻, 6 号
選択された号の論文の11件中1～11を表示しています
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Tatsuzo TONE, Masayuki NAKAGAWA1969 年 6 巻 6 号 p. 295-302
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーThe effects brought by the presence of fission products (F.P.) on the effective multiplication factor keff the Na-void reactivity, the breeding ratio, the fuel composition and kinetics parameters have been calculated as functions of burn-up for Pu-U fast reactor with 3, 000l core volume.
The F.P. sharply reduce keff and increase the positive values of the Na-void reactivity.Moreover, at a given burn-up, this effect of F.P. on keff and Na-void reactivity is governed largely by the total amount of the F.P. found accumulated at the time of observation, and is independent of the history of the material.
The F.P. hardly influence the transformation accompanying burn-up undergone by the ratio of Pu to 238U atoms and by the isotopic composition of Pu. Similarly, the effect on the internal breeding ratio also is very small.The total breeding ratio increases gradually with accumulation of the F.P. The effect on the effective delayed neutron fraction βeff is only slight, while that on the prompt-neutron lifetime lp is appreciably larger.抄録全体を表示PDF形式でダウンロード (616K) -
Reiko SAITO, Satoru KATSURAGI1969 年 6 巻 6 号 p. 303-307
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーThe higher order perturbation theory is applied to the one-dimensional multi-group diffusion equation.
The method of calculating the eigenvalue, eigenfunction and adjoint function of the higher mode is established for a non-Hermetian matrix.
The diffusion equation is solved by the higher order perturbation method, through the use of the eigenvalues, eigenfunctions and adjoint functions of the higher modes. The newly devel-oped method is applied to the estimation of reactivity effect in a reactor.抄録全体を表示PDF形式でダウンロード (360K) -
Yukio ISHIGURO, Shuji INOUE, Hideki TAKANO1969 年 6 巻 6 号 p. 308-314
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーThe temperature dependence of the intermediate parameters used in intermediate-resonance treatment has been investigated through an exact-numerical approach. In calculating the Doppler coefficient of the resonance integral with the interference between resonance and potential scattering taken into account, the temperature dependence of the parameter for the absorber becomes quite important, and neglect of the temperature dependence gives rise to serious errors in the Doppler coefficient of the resonance integral.In the case of the parameter for moderator scattering, however, hardly any temperature dependence is observed.
A simplified method is proposed for taking account of the temperature dependence of the IR parameter in intermediate resonance approximation. This method is an interpolation approach based on the results obtained from the foregoing exact numerical calculation. The simplified method proposed gives good results for the Doppler coefficient of the resonance integral.抄録全体を表示PDF形式でダウンロード (490K) -
Akira OYAMA, Shigehiro AN, Jensan TSAI1969 年 6 巻 6 号 p. 315-321
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーIn this paper is proposed a new method of calculation of the effects of multiple control rods. The reactor is divided into two parts - the uniform fuel region and the control rods. The sinks for both thermal and epithermal fluxes of the control rods are taken into account. This method overcomes such disadvantages of the conventional methods as limitations on the number, the properties, and on the locations of the inserted control rods, as well as the considerable calculating time required. The validity of the theory proposed in this paper was ascertained by comparisons with experiments in a natural U fueled, water moderated subcritical facility and with results obtained with the conventional method.抄録全体を表示PDF形式でダウンロード (434K) -
Akira DOI, Tadao KOBAYASHI, Kiyoshi INOUE1969 年 6 巻 6 号 p. 322-325
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーEvaporation of NO2 containing Pu nuclides formed during irradiation is discussed on the basis of data from the mass spectrometry of NO2 specimen irradiated to about 8, 000 MWD/T burnup. The principal findings are that: (1) the ratio between Pu+ and U+ ion currents obtained from the vaporization-ionization process of the NO2 specimen was greater than the corresponding ratio of atoms present in the specimen; (2) in temperature dependency, the U+ ion current followed that of the NO2 vapor pressure, but no such correspondence was seen between the Pu+ ion current and the PuO2 vapor pressure.抄録全体を表示PDF形式でダウンロード (289K) -
Zenzi HAGIWARA, Yoshihisa TAKAKURA1969 年 6 巻 6 号 p. 326-332
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーIn search of a suitable ion exchange method for the enrichment of Li-sotopes, column elutions of Li-band have been examined under various conditions. For long distance displacement of the Li-band, BaAc2 and CaAc2 were found excellent for eluant, and the Li proved to be very well retained by hydrogen bed with Dowex 50 W-X 12, 50100 mesh. From the standpoint of resin utilization and regenerant efficiency in cyclic column operation, CaAc2 is preferable to BaAc2.Enrichment experiments were carried out with Li-isotopes, using the above exchange systems, which proved that 7Li and 5Li were well concentrated in the respective ends of the Li-adsorption band. In one run, the 7Li and 5Li were enriched to 97.09 and 14.64 % respectively in the front and rear edges of the band.抄録全体を表示PDF形式でダウンロード (427K) -
Koreyuki SHIBA, Muneo HANADA, Seishi YAJIMA1969 年 6 巻 6 号 p. 333-337
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーThe chemical state of fission Te released from ceramic fuels was studied by means of the thermochromatograph. In inert atmosphere, the fission Te was found to be released in the form of metal, but in the presence of oxygen, it readily reacted therewith to form TeO2. The chemical state of I released from Te and TeO2, was also determined.抄録全体を表示PDF形式でダウンロード (348K) -
M. Rafiq HAROON1969 年 6 巻 6 号 p. 338-340
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーThe systematic variation of lattice parameters as a function of fuel-moderator ratio in a subcritical assembly (natural uranium, graphite moderated) has been investigated. Diffusion theory was used for correlation of results. The theoretical results were calculated according to the procedure laid down for graphite-moderated reactors based on the unit-cell concept of Wigner-Seitz. The results show that the method (Wigner-Seitz) predicts accurate results even when a fuel element is assumed to be spread over two lattices uniformly. This also proves the method of replacing a square lattice by an equivalent cylindrical one. The effect of voids (gas channels) on the lattice-parameters was also considered.抄録全体を表示PDF形式でダウンロード (229K) -
Yuji ISHIGURO, Shinji AYAO, Mitsuho J. HIRATA1969 年 6 巻 6 号 p. 341-343
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーPDF形式でダウンロード (238K) -
Akira FURUHASHI1969 年 6 巻 6 号 p. 343-346
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーPDF形式でダウンロード (275K) -
Katsuichi IKAWA, Kiyoaki TAKETANI1969 年 6 巻 6 号 p. 346-347
発行日: 1969/06/25
公開日: 2008/04/18
ジャーナル フリーPDF形式でダウンロード (133K)
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