Civil Engineering Reference
In-Depth Information
Table 3.4 (continued)
ABWR (General Electric,
HITACHI, TOSHIBA)
ABWR-II (General Electric,
HITACHI, TOSHIBA)
Steam pressure
MPa
7.0
7.0
C
Steam temperature
288
288
Fuel cycle
Average fuel burn up MWd/ton
50,000
60,000
>
>
Refueling sequence
24 Months
18 Months
Average fissile fraction in spent fuel
- U-235
%
0.8
0.8
- Pu-fiss.
%
0.7
0.7
a See Fig. 3.33
Fig. 3.29 Core and primary
system of the ABWR [ 18 ]
The steam is generated by water boiling in the upper part of the reactor core. The
core flow is driven by ten internal recirculation pumps. The feedwater coming from
the feedwater tank mixes with the water coming from steam separators and dryers
and flows downward in an annular ring between the reactor pressure vessel and the
core shroud. Then it changes its flow direction and flows upwards through the core.
Steam is separated from water droplets in separators and dried in the dryers. It
leaves the reactor pressure vessel via three or four outlet steam pipes. The control
rods are vertically inserted and withdrawn from below the core. The control rod
guide tubes are mounted on the reactor pressure vessel bottom.
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