TERMIUM Plus^®

Record 1,  Textual support,  English

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, record 1, English, - negative%20pressure%20containment%20system

Record 1,  Textual support,  French

Record 1,  Textual support,  Spanish