How many countries in the world in 2015 only possessed two nuclear reactors for electricity generation?

In 2015, there were five nations in the world that only possessed two nuclear reactors for electricity generation. These nations were: Brazil, Bulgaria, Mexico, Romania, and South Africa.

In Brazil, nuclear energy accounts for about 3% of the nation's electricity. With Bulgaria, it operates two pressurized water reactors with a total output of 1926 MW (megawatt power). Mexico has one nuclear power plant, which has two boiling water reactors. These reactors account for about 4.6% of the nation's electricity production. Noting Romania, it currently has 1,400 MW of nuclear power capacity with its 2 reactors. Finally, in South Africa, it is the only country in Africa with a commercial nuclear power plant. The two reactors located at the nuclear power station accounts for around 4% of South Africa's electricity production.

So, the official energy policy of these five nations is that nuclear energy is keenly required to assist civilian purposes.