No they wouldn't... the costs are not entirely what are preventing it now, and the DOE was specifically targeting these for approval to reduce the actual building costs which are the highest part of the costs.

>DOE is also supporting the development of smaller reactor designs, such as microreactors and small modular reactors, that will offer even more flexibility in size and power capacity to the customer. These factory-built systems are expected to dramatically reduce construction timelines and will make nuclear more affordable to build and operate.

https://www.energy.gov/ne/articles/advantages-and-challenges-nuclear-energy#:~:text=High%20capital%20costs%2C%20licensing%20and,have%20also%20deterred%20public%20interest.