Westinghouse had severe technical problems with AP1000 and it's not alone. French nuclear reactor builder Areva was restructured after they could not get their new EPR reactors ready on time. Their flagship project Olkiluoto 3 is nine years late and several billions of euros over budget.
Chinese are building reactors as fast as they can. They are buying reactors designs from all main manufacturers. There are 21 reactors under construction and they are three years late on average because manufacturers can't get these next generation reactors ready.
Nuclear reactors being constantly late and exceeding their budgets is not new. This was true in 60's and 70's and it's true now.
First Magnox reactors had very low efficiency < 20% and their electricity production was not competitive. Their main use was to produce plutonium for weapons.
Chinese are building reactors as fast as they can. They are buying reactors designs from all main manufacturers. There are 21 reactors under construction and they are three years late on average because manufacturers can't get these next generation reactors ready.
Nuclear reactors being constantly late and exceeding their budgets is not new. This was true in 60's and 70's and it's true now.