[en] Possibility for the application of the reduced-moderation water reactors (RMWR) as energy source is studied in the Japan Atomic Energy Research Institute (JAERI). Three concepts for active zones of the BWR and PWR type reactors that may be used for the RMWR project are considered. For the BWR type reactors active zones with high breeding ratio, fuel cycle with long persistence of operation between fueling, simple configuration of active zone without breeding blanket are viewed. For the PWR type reactors active zones with heavy and light water coolants are considered

[en] Bellows are employed as useful mechanical elements with their flexibility and imperviousness to liquid and gas in the system in which such chemically active substances as sodium are handled. Since the early time of development of Japanese LMFBR, bellows have been used e.g. for the shaft seal of small sodium valves. Bellows are employed in the fast experimental reactor JOYO which is now in operation and the fast prototype reactor MONJU whose design program is in final stage at the following parts: control rod drive mechanism; intermediate heat exchanger; small valve; mechanical penetration assembly of the containment boundary; outer piping of the double-walled primary system (for JOYO only). In addition, the application of bellows as thermal expansion joint to the main piping system is under consideration for future FBRs. This paper outlines the research and development work on bellows for FBR use in Japan. (author)

No abstract available

[en] The report is structured as follows: (1) Introduction (JAERI facility; Modes, parameters); (2) Experimental methods (Activation foils: activity measurements, spectrum adjustment; Bonner spheres spectrometer; Al-P glass TLD; Semiconductor detector; Si diode for fast neutron kerma determination); (3) Experimental set-up (Free beam measurements: neutron spectrum measurement, photon dose and fast neutron kerma measurement, beam profile measurement, BSS measurement; Phantom measurements: neutron dose depth measurement, photon dose and fast neutron kerma depth profiles, on-line thermal neutron measurement in water phantom, on-line thermal neutron measurement in cylindrical water phantom); 4. Si-Li detector dead time and effectiveness; and (5) The Bonner sphere spectrometer responses. (P.A.)

[en] This article is based on a review of Fiscal Year 1986 including: Petroleum products imports; Stockpiling of oil; Earning of petroleum industry. The situation in Fiscal Year 1987 is discussed including: Supply and demand; Deregulation; Expansion of government-owned stockpiling; Outlook of petroleum industry

[en] Photoreactivation of microorganisms following UV disinfection is one of the research topics of interest in assessing the performance of UV disinfection, because there is little consensus on how the visible light intensity relates to the photoreactivation rate and the maximum survival in wastewater treatment processes. Apparent photoreactivation by a fluorescent lamp was observed in case of indicator bacteria (heterotrophic bacteria, coliform bacteria, fecal coliforms) in raw sewage, but not E. coli B and E. coli K12 A/λ(F+). Inactivation of fecal coliform was observed simultaneously during photoreactivation process by sunlight. Dose rate at 360 nm wave length as visible light intensity showed that it was a useful indicator for assessing the photoreactivation rate and the maximum survival when photoreactivation took place by both fluorescent lamp and sunlight. The model for photoreactivation was developed. The photoreactivation rate increased with increasing visible light intensity at 360 nm. However, the maximum survival value may not be affected by visible light intensity. (author)

[en] The report focuses on selective separation of molybdenum(VI), gallium(III) and copper(II) with long chain alkylated 8-quinolinol such as 5-octyloxymethyl-8-quinolinol (HO₈Q) and 2-methyl-5-octyloxymethyl-8-quinolinol (2-Me-HO₈Q) investigated based on extraction equilibrium. The hydrophobic effect of various substituents at 5-position of 8-quinolinol on copper(II) extraction in acidic medium is compared with that of Kelex 100. The extraction rate-controlled separation of nickel(II) with HO₈Q from cobalt(II) is also investigated. Observation and discussion are made of distribution constant and acid-dissociation constant of HO₈Q, extraction of metal ions with 5-octyloxymethyl-8-quinolinol or 5-dioctylaminomethyl-8-quinolinol, separation of copper(II) from iron(III), copper(II) extraction equilibrium, extraction of molybdenum(VI) with HO₈Q, extraction constant for extraction of molybdenum(VI) with HO₈Q, effect of diverse ions on determination of molybdenum(VI), separation of gallium(III) with HO₈Q and 2-Me-HO₈Q, composition of Ga(III)-HO₈Q, extraction equilibrium of cobalt(II) with HO₈Q, extraction equilibrium of nickel(II) with HO₈Q, kinetics of extraction of nickel(II) with HO₈Q, and separation of nickel(II) from cobalt(II). (N.K.)

[en] General influence of fission and corrosion products in primary system on MONJU plant design is reviewed. Various research and development works are now in progress to decrease the generation rate, to remove the products more effectively and to develop the methods of evaluation the behaviour of radioactive products. The inventory and distribution of fission and corrosion products in the primary circuit of MONJU are given. The radiation levels on the primary components are estimated to be several roentgens per hour. (author)

[en] It is investigated the problem of the gauge independence in the discussions based on renormalization group equations. This problem is trivial only in the minimal-subtraction renormalization scheme. In the Weinberg and the Georgi-Politzer schemes, however, this is nontrivial and should be considered seriously. A method to improve this problem is proposed

[en] A summary is given of the papers presented at the Fifth International Conference on Plasma Physics and Controlled Nuclear Fusion Research which was organized by the International Atomic Energy Agency (IAEA). A major value of the conference lay in demonstrating the steady progress and increasing understanding of the physics of controlled nuclear fusion, rather than any limited number of highlights. (U.K.)