Argentina has a long history of involvement with nuclear power. Siemens (Germany) built one of its operating reactors while AECL (Canada) built the other one. There is a third plant that has been under construction for more than 20 years, with little progress made during recent years.
The announced plan includes upgrades to the existing reactors, an effort to complete the stalled plant, and the resumption of uranium mining and processing. According to a MercoPress page titled Argentina re-floats nuclear energy program the plan also includes the construction of a CAREM prototype.
(It was pretty cool to see that the very first return from a Google search with the terms “Argentina CAREM” returned a familiar article titled CAREM – An Innovative, Small PWR that I wrote in June, 2001, originally as a column for a webzine called Power Online.)