Seven boiling water reactors at the Fukushima Daiichi plant and the neighbouring Fukushima Daini plant, both operated by Tokyo Electric Power (Tepco), shut down on Friday.
There are a number of different reactors in use, most commonly water-cooled pressurised or boiling water reactors - though other reactor types are kept cool with the help of liquid metal, gas or molten salt.
Mr Ishizuka acknowledges that the company is taking a risk, though given that Hitachi knows how to build advanced boiling water reactors and that it now owns the land on which to build them, he is firmly optimistic.
The reactors at Fukushima-Daiichi are called boiling-water reactors (BWRs) and were manufactured by General Electric.
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Companies with boiling-water reactors similar to the ones in Japan include Exelon Corp.
Two officials from the U.S. Nuclear Regulatory Commission with expertise in boiling water nuclear reactors have deployed to Japan as part of a U.S. International Agency for International Development (USAID) team.
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Executives have been pressing officials in China to include GE's advanced boiling-water reactors in their next five-year economic plan (China uses the pressurized reactors championed by perennial GE rival Westinghouse, now part of British Nuclear Fuels Ltd.).
Officials there have decided to build pressurised-water reactors a technology that Westinghouse specialises in rather than the boiling-water designs offered by Toshiba.
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Hitachi's proposed facilities will use its advanced boiling water technology, which is already used in four reactors in Japan.
The government has a target of the end of the year to bring the plant to a cold shutdown, when the reactors are stable and the water inside them is no longer boiling.
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