NuScale Power Corp. shares initially surged by nearly 10% today to $10.87 following reports of a potential significant investment by the Japanese government in its small modular reactor (SMR) projects. - This potential investment, part of a broader U.S.-Japan nuclear initiative, aims to bolster NuScale's funding and validate demand for its technology. - However, the stock later experienced volatility and a 'sharp pullback' as investors began to question the realism and immediate actionability of the reported deal, leading to some unwinding of earlier gains.