[en] The filtering elements are tested with a sodic fluorescein aerosol. The efficiency of the purification systems of the nuclear installations as well the information on the change in this efficiency with time is determined

[en] The engineering process is described right from the problem posed up to the completed installation or the modification of an installation. The problems to be solved cover the equipment, the workers and the population. The solutions during the various stages are examined: compendium of basic data, determination of functions, items of equipment, carrying out the work and operation of the installation

[en] The parameters of the ventilation flow rate, depression, arrangement of the premises, dimensioning of the equipment, energy sources are determined in order to reach the target fixed in the best technical and economic conditions throughout the whole life of the system

[en] This paper examines the siting of the abstraction points linked to the ventilation of the room and the efficiency of the abstraction system which is the product of the efficiencies of each link: pickup of aerosols, any transport in a pipe and measurements in the abstraction head

[en] In this work an examination is made of ventilation problems in nuclear installations, of the fuel cycle or the handling of radioactive compounds. The study covers the detection of radioactive aerosols, purification, iodine trapping, ventilation equipment and its maintenance, engineering, safety of ventilation, fire efficiency, operation, regulations and normalization

[en] Having defined safety and analysis of safety, the nature and significance of nuclear hazards are indicated, highlighting the importance of ventilation for safety. The authorization procedure for the creation and commissioning of an installation is also indicated. The list of safety organizations in France is given. Mention is then made of the general technical regulations, their aim and working out. To conclude, normalization and its application to the ventilation of nuclear installations is examined

[en] In this article a critical examination of the ventilation facilities is made so that they may be improved and maintenance facilitated. The air intakes, filters, exchangers, humidifiers, ventilators, flaps and conduits are examined in turn

[en] The problems met with during the operation of a plant reprocessing irradiated fuels at La Hague are examined. This makes it possible to become acquainted with the difficulties encountered and become aware of the weak points and limitations of an installation and to make provision for any improvements that may be needed, with due allowance for the technical and economic constraints. The installations are briefly described and the weaknesses or difficulties encountered in operation are highlighted

[en] In order to restrict the consequences of the spread of a fire on adjacent premises and on the environment, the fire must not damage the ventilation system. This is why every endeavour must be made to confine the fire from the intake to the outlet of this system. The study of the confinement measures will cover in succession each component part of the system, namely: air intake, blower filter, premises, ducting and extraction filters. The spread of the fire and the effects on ventilation are then examined

[en] The reliability of ventilation systems in nuclear installations is based on principles and conditions which are but one particular application among those that have been decided for the safety of installations. It rests on the presence of a person in charge of the installation who must have at his disposal a well designed plant and must operate it in accordance with clear and precise rules. The obligation that he is now under to present a detailed safety report, drawn up specially to highlight the guarantees assured with respect to the personnel and the environment, enables it to be analyzed by independent authorities