Areva EPR

■ EPR NUCLEAR ISLAND
EPR LAYOUT
7
3
4
1
3
3
2
3
5
4
6
1 Reactor Building
The Reactor Building located in the center of the Nuclear Island houses
the main equipment of the Nuclear Steam Supply System (NSSS)
and the In-Containment Refueling Water Storage Tank (IRWST). Its
main function is to ensure protection of the environment against internal
and external hazards consequences under all circumstances. It
consists of a cylindrical pre-stressed inner containment with a metallic
liner surrounded by an outer reinforced concrete shell.
The main steam and feedwater valves are housed in dedicated
reinforced concrete compartments adjacent to the Reactor Building.
The primary system arrangement is characterized by:
• pressurizer located in a separate area,
• concrete walls between the loops and between the hot and cold
legs of each loop,
• concrete wall (secondary shield wall) around the primary system
to protect the containment from missiles and to reduce the spread
of radiation from the primary system to the surrounding areas.
2 Fuel Building
The Fuel Building, located on the same common basemat as the
Reactor Building and the Safeguard Buildings, houses the fresh fuel,
the spent fuel in an interim fuel storage pool and associated handling
equipment. Operating compartments and passageways, equipment
compartments, valve compartments and the connecting pipe ducts
are separated within the building. Areas of high activity are separated
from areas of low activity by means of shielding facilities. The
mechanical floor houses the fuel pool cooling system, the emergency
boration system, and the chemical and volume control system. The
redundant trains of these systems are physically separated by a wall
into two building parts.
3 The Safeguard Buildings
The four Safeguard Buildings house the safeguard systems such as
the Safety Injection System and the Emergency Feedwater System,
and their support systems. The four different trains of these safeguard
systems are housed in four separate divisions, each located in one
of the four Safeguard Buildings.
The Low Head Safety Injection System is combined with the
Residual Heat Removal System. They are arranged at the inner areas
in the radiologically controlled areas, whereas the corresponding
Component Cooling and Emergency Feedwater Systems are
installed at the outer areas in the classified non-controlled areas.
The Main Control Room is located in one of the Safeguard Buildings.
4 Diesel Buildings
The two Diesel Buildings shelter the four emergency Diesel
generators and their support systems, and supply electricity to the
safeguard trains in the event of a complete loss of electrical power.
The physical separation of these two buildings provides additional
protection.
10 I