TNAG-1508-FCO40-2066-Guangdong-nuclear-power-station-project-at-Daya-Bay-safety-c-1987 — Page 124

1176.

s its reactor.

energy,

During operation the reactor

gives off nuclear

mainly

in the form of thermal energy.

This is

carried

away

by

the

to coolant in the primary loop and used

generate

steam. For this reason the whole of the primary loop is known as

the nuclear steam supply system. It is also called the nuclear

island. It is the equivalent of the conventional boiler system of

the conventional thermal power stations,

technology is much more complicated.

but the process

For the sake of safety, the

whole of the primary loop is installed in a hermetically

structure known as the

sealed

containment building. In this way,

environmental safety will not be affected either by normal

operation or by an accident. The secondary loop, using steam

turbines to generate electricity, is basically similar to the

turbine generator system at a conventional thermal power station,

and this is known as the conventional island.

If we look at the most widespread pressurized water nuclear

power station, the nuclear steam supply system (the primary loop)

consists mainly of the reactor, the steam generator,

the main

generating

and the coolant pipes. The steam turbine

system (the secondary loop) consists

pump, the pressurizer,

electricity

mainly of the steam turbine generators, the water condensation

system and the water supply system. In a pressurized water

nuclear power station, the primary loop is completely separated

from the secondary loop. It is a sealed circulation system. The

basic flow process is as follows: the main pump conveys the

pressurized coolant to the reactor which carries away the thermal

energy produced by the nuclear fuel. After leaving the reactor,

10