[en] EdF finds that computer aided design is invaluable in the design of a new series of standardised plants - its 1400MWe N4 series - and of the new breeder, RNR 1500. Its use can even be justified for existing plants where major maintenance work is required. (author)

[en] Configurations most frequently involved in gas-liquid two-phase flow are defined. A qualitative classification in horizontal, vertical, and pulsed flow is used. A quantitative approach is then envisaget with the equations

[en] Mathematical methods generally used in studying flow stability are presented. Monophasic flow are first considered: Poiseuille and Couette flow, flow around obstacles (transfer method). Two-phase flow are then considered: Ledinegg static instability, and dynamic instability (oscillations). The inadequacy of nonlinear methods is shown

[en] This press report of EDF about the material balance on 1997 presents the global figures stressing upon the effects of the competition policy conducted by the company in the last five years. A 11.2% reduction in the actual expenses of the PWR sector exploitation was recorded in the period 1992 - 1997. Good results were obtained in 1997 in the field of safety and new incentives have been recorded. The principles of a preventive maintenance are stipulated. The cooperation with servicing companies is reported, stressing, particularly, the issues like: the professionalism and safety culture; the amelioration of the economical transparency of enterprises; individual dosimetry - significant advances; regional cooperation; emergency exercises to correct dysfunctions; a better medical surveillance of the intervening servicing enterprises; new regulations foreseen to be in force in 1998. Issues like radioprotection and environmental protection, fuel management, the status of EPR (European Pressurized water Reactor) project are also presented. The technical assistance mission related to the developing in China of two 1000 MW nuclear projects is mentioned as well as the problems posed by the Super Phenix Reactor decommissioning

[en] Metallic continuous heat exchangers are discussed. They are classified according to the field of application. Heat transfer modes are reviewed (radiation, conduction, convection); the convective modes more frequent in continuous exchangers are emphasized (natural or forced convection with or without phase changes in the fluids involved). Some indications relating to pressure drop calculation in these apparatus are given before the calculation itself. The thermal and hydraulic aspects are stressed and rudiments are given in view of a mechanical study