One player in the small modular reactor business is SMR (Nuscale power corp). They have a contract to build a modular reactor in Romania. https://finance.yahoo.com/news/nuscale-power-ropower-announce-signing-115000917.html https://www.nuscalepower.com/en I am not currently planning on investment however I am watching it.
Recent article talking about the costs. https://seekingalpha.com/article/4569771-nuscale-smr-technology-costs-problematic Comment below the article: