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Current and future nuclear power reactors and plants 129

Fig. 4.9 Simplified layout of typical advanced boiling water reactor (ABWR) NPP [1].
Courtesy and copyright by Hitachi, Ltd.

Toshiba’s ABWR has been in operation since 1996. In 1996, Unit 6 at the
Kashiwazaki-Kariwa NPP was put into operation as the world’s first ABWR plant, i.e.,
the first Generation III+ reactor and NPP. In 1997, Unit 7 began operation at the same
plant. In 2005, another ABWR (Unit 5) was commissioned at the Hamaoka NPP.
(As the result of the Fukushima disaster in Japan in March of 2011, all 42 Japanese reac-
tors were shut down. Recently, in April of 2018, seven reactors have been restarted.)
An important feature in the ABWR is that the condenser plays a role of a deaerator.
The system consists of the main deaerating condenser connected with air ejector and
off-gas treatment system.
The corresponding layout and T-s diagram of a typical ABWR NPP are shown in
Figs. 4.10 and 4.11, respectively.