TERMIUM Plus^®

Fiche 1,  Justifications,  Anglais

Record number: 1, Textual support number: 1 CONT

The Hydro/AECL design team met this challenge by introducing a highly innovative containment concept-what was to become known as the negative pressure containment system. Central to the system is a large reinforced concrete building operated at a high level of vacuum(hence, the name "vacuum building"). This building is linked to the individual reactor buildings via a duct system and a number of parallel isolating valves. These valves are normally closed, permitting the reactor buildings to operate at normal atmospheric pressure. Should an accident arise, leading to a pressure rise in a reactor building, this pressure rise will actuate the isolating valves, thereby opening a flow path from the reactor building to the vacuum building. As a result, the pressure in the reactor building is quickly reduced to below atmospheric pressure, thereby positively preventing the escape to the environment of any radioactivity released inside the reactor building as a result of the accident.  1, fiche 1, Anglais, - negative%20pressure%20containment%20system

Fiche 1,  Justifications,  Français

Fiche 1,  Justifications,  Espagnol

Fiche 2,  Justifications,  Anglais

Record number: 2, Textual support number: 1 CONT

Multi-unit stations share a vacuum building containment system.  1, fiche 2, Anglais, - vacuum%20building%20containment%20system

Fiche 2,  Justifications,  Français

Record number: 2, Textual support number: 1 CONT

Les centrales à plusieurs tranches utilisent pour leur part un système de confinement avec bâtiment sous vide.  1, fiche 2, Français, - syst%C3%A8me%20de%20confinement%20avec%20b%C3%A2timent%20sous%20vide

Fiche 2,  Justifications,  Espagnol

Fiche 3,  Justifications,  Anglais

Record number: 3, Textual support number: 1 DEF

An energy-absorbing system employing water to limit the value and duration of overpressure within the reactor building following an unintentional loss of coolant.  5, fiche 3, Anglais, - dousing%20system

Record number: 3, Textual support number: 1 CONT

Inside the building housing a reactor which is undergoing a major nuclear accident, internal steam pressure can be greatly reduced by using a dousing system to condense the steam. All CANDU reactors are provided with such a dousing system. It is much more difficult to reduce the pressure from non-condensable gases which are formed in great quantities during meltdown.  6, fiche 3, Anglais, - dousing%20system

Record number: 3, Textual support number: 2 CONT

The Containment System forms a continuous, pressure-confining envelope around the reactor core and primary heat-transport system. In the CANDU 6 design it consists of a pre-stressed, post-tensioned concrete structure, an automatically-initiated dousing system, building coolers, and a filtered air discharge system. In Ontario Hydro's multi-reactor designs, containment includes a vacuum building connected to all reactor vaults in the plant, with its own dousing system for reducing internal pressure.  7, fiche 3, Anglais, - dousing%20system

Fiche 3,  Justifications,  Français

Record number: 3, Textual support number: 1 DEF

Système d'absorption d'énergie qui, à la suite d'une perte accidentelle de caloporteur, utilise de l'eau pour limiter la surpression à l'intérieur du bâtiment d'un réacteur.  5, fiche 3, Français, - syst%C3%A8me%20d%27arrosage

Record number: 3, Textual support number: 1 OBS

mécanisme d'aspersion : terme extrait du Glossaire de l'énergie nucléaire (1992) et reproduit avec l'autorisation de l'OCDE.  6, fiche 3, Français, - syst%C3%A8me%20d%27arrosage

Fiche 3,  Justifications,  Espagnol