This study presents the results of electrophysical non-destructive testing collectors welded joints to body steam generators PGV 1000Mof reactor WWER-1000. The studied located in Resource Сenter National Research Nuclear University MEPhI at site reactors construction factory “Atommash” Volgodonskcity-Russia. primary loop collector was 1000Mand technical condition investigated by (EPhT). In gene...

Thermal hydraulics of nuclear reactor as a basis of reactor safety has a very important role in reactor design and control. The thermal-hydraulic analysis provides input data to the reactor-physics analysis, whereas the latter gives information about the distribution of heat sources, which is needed to perform the thermal-hydraulic analysis. In this study single heated channel model as a very f...

Most WWER-440 reactors are operated over the planned operational lifetime of 30 years. Now, owners/operators preparing for second phase extending operation. The paper presents an overview most important aspects ageing main components WWER-440-type based on and management experiences primary research efforts supporting aims to demonstrate that expectations operability these up 60–70 years realis...

FOREWORD This report presents an overview of the activities of the Extrabudgetary Programme (EBP) on the Safety of WWER and RBMK Nuclear Power Plants during the period 1990-1998. The Programme background, its objectives and its scope are described in Sections 1 and 2. The report focuses on the wide scope of the activities aimed at identifying safety deficiencies, ranking their safety importance...

Energy balance in Central and Eastern Europe is based to a substantial degree on the use of nuclear energy. Nuclear's share of electricity production stands at about 20% in the Czech Republic, 25% in Ukraine, 32% in Bulgaria, 46% in Hungary, and 49% in the Slovak Republic. Reliable operation of nuclear power plants has been essential for the economic development of these countries. Nuclear plan...

Dissolution of UO2, U3O8, and solid solutions of actinides in UO2 in subacid aqueous solutions (pH 0.9-1.4) of Fe(III) nitrate was studied. Complete dissolution of the oxides is attained at a molar ratio of ferric nitrate to uranium of 1.6. During this process actinides pass into the solution in the form of U(VI), Np(V), Pu(III), and Am(III). In the solutions obtained U(VI) is stable both at ro...