[en] A description is given of the test fusion reactor OTR which is conceived to be a major step between the present generation of tokamaks in the USSR and commercial reactors. The design of OTR is based on near-term technologies and its construction will possibly be around the year 2000. (orig.)

No abstract available

[en] The paper presents in foil form the plan of the new stage of research and development fusion in Japan

[en] The specific features are shown of scientific researches on the experimental reactor which is actually a multipurpose test-experimental plant intended for gaining experience in operation of a new type reactor under the NPP conditions. There is described a principal approach to estimation of the economic efficiency of these researches. There is suggested a parameter which provides for quantitative estimation of the efficient use of the experimental opportunities of the entire reactor. This parameter is represented by the relative scope of the experimental operations on the plant per unit expenditure. This parameter makes it possible to estimate the degree of use of the existing experimental opportunities of the plant and efficiency of the measures aimed at extension of these opportunities. With the use of this parameter, it will not be difficult to determine the absolute value of the economic effect

[en] This document provides a Standard Review Plan for the guidance of the NRC staff to assure that complete and uniform reviews are made of research and test reactor emergency plans. The report is organized under ten planning standards which correspond to the guidance criteria in Draft II of ANSI/ANS 15.16 as endorsed by Revision 1 to Regulatory Guide 2.6. The applicability of the items under each planning standard is indicated by subdivisions of the steady state thermal power levels at which the reactors are licensed to operate. Standard emergency classes and example action levels for research and test reactors which should initiate these classes are given in an Appendix

[en] The number of the abnormalities and failures reported in fiscal 1983 on the basis of the relevant law was 5. When these 5 abnormalities and failures were classified according to the management factors, that due to improper construction management was 1 case, that due to improper maintenance management was 1 case, those due to improper operation were 2 cases, and another 1 case. Among these 5 abnormalities and failures, those occurred during the operation of reactors were 2 cases, and those discovered or occurred after stop were 3 cases. Two cases occurred during the operation of reactors were 1 case automatically stopped due to the abnormality in the attached experimental facility, and 1 case of leaking primary argon gas due to the improper operation of a sampling valve. Those discovered or occurred after stop were the abnormality in fuel cladding, the radiation exposure of workers due to lifting irradiated capsules by mistake, and the abnormality in secondary cooling piping. There was no effect to surrounding environment in these abnormalities and failures. There were 5 other minor failures. (Kako, I.)

No abstract available

[en] This document provides a Standard Review Plan for the guidance of the NRC staff to assure that complete and uniform reviews are made of research and test reactor emergency plans. The report is organized under ten planning standards which correspond to the guidance criteria in Draft II of ANSI/ANS 15.16 as endorsed by Revision 1 to Regulatory Guide 2.6. The applicability of the items under each planning standard is indicated by subdivisions of the steady state thermal power levels at which the reactors are licensed to operate. Standard emergency classes and example action levels for research and test reactors which should initiate these classes are given in an Appendix

[en] Safety and cost information is developed for the conceptual decommissioning of two representative licensed nuclear research and test (R and T) reactors. Three decommissioning alternatives [DECON (immediate decontamination), SAFSTOR (safe storage followed by deferred decontamination), and ENTOMB (entombment)] are studied to compare the costs (in 1981 dollars), occupational radiation doses, potential radiation dose to the public, and other safety impacts of implementing each of the alternatives

[en] High performance research reactors, such as OSRIS use highly enriched fuels in the form of U-Al alloys in very thin plates. In view of problems of non-proliferation the replacement of this fuel with low enrichment is considered. For high performance reactors the need to maintain a high power density and to have the availability of sufficient reactivity makes present technology inadequate. The adoption of a technology of oxide fuels in plates developed by the C.E.A. is therefore being studied. The choice of this new fuel carries certain consequences with regard to the conditions of irradiation and the exploitation of the fuel. With regard to the conditions of irradiation, due to the substantial increase in the ²³⁵U load, there is a parallel increase in the ratio of fast neutron flux and thermal neutron flux in the core. There is also a certain stability in the fast neutron flux for a constant power volume, a slight reduction in thermal neutron flux in the outer region accompanied by a substantial decrease in the heating due to gamma rays. With regard to the exploitation it is indispensable to make allowance for an increase in the need for cooling as well as a certain number of modifications concerning the D.R.G., the maintenance, etc. These modifications always generated on the basis of old installations will of course be integrated into the conception of a new installation, conceived for the utilization of fuels made of oxide plates which prove themselves perfectly viable for this type of reactor