Civil Engineering Reference
In-Depth Information
Containment
cooling
condenser
Steam outlet
Drywell
flooding
device
Core melt
(metal frac-
fraction)
Core melt
(oxide
fraction)
Fig. 3.28
Cooling of RPV exterior in the event of core melt of SWR-1,000 [
16
]
containment is maintained at a pressure lower than atmospheric so that any radio-
active gases leaking into this annulus can be filtered prior to the release to the
environment.
In case of the SWR-1,000 (KERENA), radioactivity releases to the outer envi-
ronment would be extremely low. Even in case of severe core melt down accidents,
evacuation or relocation of the population would not become necessary.
3.4 The Advanced Boiling Water Reactors
The Advanced Boiling Water Reactor (ABWR) was designed and is manufactured
by General Electric (USA) as well as by TOSHIBA and HITACHI (Japan) [
18
-
21
]. ABWR plants are operating in the USA, Japan and Europe. The ABWR has
many similar design features compared to the BWR-1,300 described in Sect.
3.3
.
The main design data of the TOSHIBA ABWR and an upgraded ABWR-II design
are given in Table
3.4
.
3.4.1 Core and Reactor Pressure Vessel of ABWR
The core with fuel elements and control elements as well as the pressure vessel of
the ABWR are displayed in Fig.
3.29
.
