Study on the Rationality of Water Supply, Drainage and Fire Protection Pipeline Layout in Integrated Pipe Gallery of Nuclear Power Plant

In the integrated pipe gallery of nuclear power plants, water supply, drainage, and fire protection pipelines often exhibit a situation of "multiple systems co-located in the same gallery with strong constraints and coupling." This situation can lead to spatial conflicts, insufficient hydraulic margins, and risks associated with multiple disasters. Therefore, a framework for rational evaluation and improvement of the layout was created, relying on parametric BIM and scenario-driven hydraulic analysis. This study uses zoning codes and interface dictionaries as the basis for unified data standards, creating calculable constraints such as clearance, passageways, and zoning crossings, thereby forming a boundary condition library for normal operation, maintenance switching, single pump failure, fire, extreme inflow, and coupled operating conditions. By using conflict thermal judgment, pressure margin distribution, and pressure drop contribution decomposition, corridors with severe conflicts and key bottlenecks are identified. Subsequently, fire water demand, water accumulation dynamics, and seismic utilization of supports and hangers are integrated into a unified KPI system for multi-objective scheme comparison and selection, resulting in a verifiable recommended layout scheme and engineering dataset.