Method of collecting liquid wastes in the building of a nuclear power plant

Purpose: To decrease the amount of pipes for conducting liquid wastes, as well as simplify the constructing works. Method: A concrete tunnel is provided in a corridor-like manner around the outside of the outer wall of the building at a position lower than the level of a floor. A plurality of drain collecting main pipes and drain collecting grooves are provided within the tunnel. The drain collecting passage is connected by way of the nearest route from drain receptacles in the building. This can simplify each of the pipeway routes and decrease the amount of the pipeways. (Ikeda, J.)