> What would be the net effect?

It wouldn't be a linear increase i.e. you can more or less estimate how many people would die per MWh produced in hydro, gas, coal etc. plants.

With nuclear if somebody dies that means a some sort of catastrophic event likely occurred regardless if a 1 or 100+ people die the reactor will be out of commission and it will cost a massive amount of money to contain it.

I'm not following the argument for being able to estimate deaths per [T]Wh for hydro, gas, etc. but not nuclear. I think hydroelectric is especially analogous