Brazil has only 3 nuclear power plants. The accident occurred when the second one was being built.

Brazil has only 2 nuclear power plants. The third planned one has large funding issues and construction is on-hold.

Yes. Angra 1 and Angra 2.

The only company that had the know how in constructions like that was involved in the Petrolão, the scandal involving bribes and and money laundry in contructions for the country national oil company, and the company was basically nuked. Now chinese contruction companies are taking the place in the market.