Nuclear regulations had nothing to do with it. Texas had very few regulations for oil/gas and for power plant winter weatherization hence the grid failed. Overall the grid is fine, but it can't handle a freak winter weather event like that, and it still can't. It has handled many summer heat events just fine (I know I've lived here for almost 15 years). Regulations are the obvious factor that lead to the failure, ERCOT has been warned (and in turn warned the politicians) about the dangers multiple times and the politicians will not pass legislation and money to fix the issue.