Civil Engineering Reference
In-Depth Information
ARHR is Additional Residual Heat Removal
RHR is Residual Heat Removal
LP is Low Pressure
HP is High Pressure
Fig. 3.23
BWR-1,300 residual-heat-removal systems of Kraftwerk Union [
17
]
and the control rod shutdown system, the three steam lines and two feed water lines,
as well as the safety relief valves, the containment isolation valves and the pressure
pulse transmitters. In addition the high pressure part of the water cleanup system
and the flooding lines for passive flooding of the reactor pressure vessel and
flooding of the drywell in case of a drastic loss of coolant are located in the drywell.
During operation the inner containment is inertized by nitrogen, to prevent hydro-
gen explosions or detonations in case of a loss of coolant accident with hydrogen
release. Above the inner containment the water filled shielding pool and the
adjacent fuel element storage pool are located. In case of refueling the reactor
pressure vessel cover is opened and the fuel elements are loaded or unloaded
through the shielding water pool and transferred to the fuel element storage pool.
The main steam lines and the feed water lines are equipped with two contain-
ment isolation valves, one located inside and one outside of the inner containment
wall. The residual heat removal systems are located underneath the pressure
suppression chamber in non-inertized compartments which are accessible for
inspection and repair from the outside [
15
,
16
].
