Civil Engineering Reference
In-Depth Information
Pilot valves
8 safety-
relief valves
depressurization
pressure relief
Passive
pressure
pulse
transmitter
(PPPT)
Fig. 3.25
Safety relief valve system of SWR-1,000 (KERENA) [
15
,
16
]
The eight main safety relief valves are actuated by solenoid pilot valves or by
diaphragm pilot valves via passive pressure pulse transmitters. Standard spring
loaded valves are also used to initiate the pressure relief function.
3.3.2.5 Emergency Condensers
Each of the four emergency condensers (Fig.
3.26
) consists of a steam line (top
connection), the heat exchanger tubes and a condensate return line (lower connec-
tion). Each return line is equipped with an anti-circulation loop and a passive
outflow reducer. The emergency condensers are actuated passively when the
water level in the reactor pressure vessel drops to a certain level. In this case the
emergency condenser tubes fill with steam which condensates. The condensate
returns back to the reactor pressure vessel.
3.3.2.6 Containment Cooling Condensers
The containment cooling condensers (Fig.
3.27
) remove residual heat passively
from the containment atmosphere to the shielding storage pool located above the
inner containment. Each containment condenser consists of tubes arranged at a
slight angle to horizontal. The tubes penetrate the upper wall of the inner contain-
ment. They are open to the shielding/storage pool. The containment cooling
