Structural, piping and equipment modules provide:
- Shortened construction schedule
- Reduced field manpower
- Increased factory-based manufacturing and assembly of modules
- Improved quality - pre-testing and inspection of modules prior to shipment
- Reduced site congestion
Modular by Design
The AP1000 plant has been designed to make use of modern, modular-construction techniques. The design incorporates vendor-designed skids and equipment packages, as well as large, multi-ton structural modules and special-equipment modules. Modularization allows construction tasks that were traditionally performed in sequence to be completed in parallel. Factory-built modules can be installed at the site in a planned construction schedule of three years - from first concrete pour to fuel load. This duration has been verified by experienced construction managers through 4D (3D models plus time) reviews of the computer-simulated construction sequence.
Parallel Work Processes in Controlled Environments
AP1000 plant modularization allows many more construction activities to proceed in parallel. This reduces the calendar time for plant construction, thereby reducing the cost of money and the exposure risks associated with plant financing. Furthermore, the reduced amount of work on site means the amount of skilled field-craft labor, which is more costly than shop labor, is greatly reduced. In addition to the labor cost savings, more of the welding and fabrication performed in a factory environment increases the quality of the work, improves the flexibility in scheduling, and reduces the amount of specialized tools on site.
To achieve proper interfaces with the rest of the plant systems and structures, interconnected piping between modules is represented in the 3D design model. This eliminates the interference concerns of typical field-run commodities (e.g., piping, duct, raceway) and “stick-built” construction techniques.