direction of electric transmission lines and potential salt damage.

5. Construction area planning

The plot plan must also accommodate various considerations for the construction besides the plant’s operational and safety requirements. In the early stage of the construction, the availability of space for heavy lifting devices around the buildings and laydown area for temporary materials becomes a very important planning matter. Major temporary facilities include:

1. Site construction office and parking areas;

2. Laydown area for temporary materials and site warehouse;

3. Steel reinforcement bars, concrete forms and

material stockyards;

4. Concrete batch plant

If the site is difficult to access from the sea during winter, an on-site stockyard must be provided to allow continuation of the construction during that season.

6. Harbor and water intake/discharge planning

In the NPP planning, it is often necessary to build a exclusive harbor surrounded by a breakwater at the front of the power plant for the transportation of heavy equipment such as the reactor pressure vessel during the construction and spent fuel casks during the plant operation. This harbor must be able to accommodate a spent fuel cask transporter (around 2,000-3,000 dwt) and heavy equipment shipment barges (around 1,000-2,000 dwt) and its docking facility must include a lifting device and a fueling system for ships using heavy oil as fuel. To take advantage of calm sea inside the harbor breakwater, the inlet of the circulating water system is often located within the harbor as well. The unloading facility should provide appropriate lifting devices such as gin pole and derrick cranes that are located for easy transfer to ground transportation after landing of the cargo.

In the NPP, a large quantity of sea water is utilized for cooling of the turbine condenser, reactor and turbine auxiliary systems and emergency plant cooling systems, and the environmental impact of the water inlet and outlet must be minimized. Since water inlet is often located in the harbor, the outlet

must be outside it to avoid inadvertent mixing.

7. Other considerations

The plot plan should also take into account the long range planning of the NPP and provide room for the construction of additional units, waste storage space and other potential additional facilities. While these are the major items of concern in the plot plan, the plot plan must be executed with good coordination among various other plans including the outdoor facilities plan, indoor facilities plan, building structure plan, construction plan (temporary facilities, civil engineering work, construction schedule coordination, etc.) and others. At the same time, the plan must realize safety, seismic capability, operability / maintainability, ease of construction, minimized construction cost, and shortened construction period while it forms the basis of the construction project plan. Figure 2.2.1 shows a schematic diagram of the site planning with highlights on important points. Figure 2.2.2 shows a typical example of a BWR site where five l,100MWe plants and two l,350MWe plants are to be constructed.

2. Main Buildings and Auxiliary Buildings

Figure 2.2.3 shows the equipment layout within the main buildings of a typical 1,1 OOM We class plant Major specifications of this sample plant are as follows.

1. A combined reactor building structure

2. An improved Mark-II type reactor containment vessel

3. Moisture separators located under the turbine

building operating floor where the main turbine, intermediate steam valves and generator are located for ease of maintenance during outage and with ample space to place disassembled components of the turbine, generator and main valves

4. Steam condensers each with an upper shell containing four feed water heaters for overall compactness of the turbine building

5. A noble gas treatment system located in the

turbine building

(OElectrical equipment for normal operation located in the turbine building

(g)A main control room located on the upper

NSRA, Japan

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