The SMR developer's stock is falling; here's why.Shares of NuScale (SMR 0.66%) fell this week, finishing down 18.8%. The drop comes as the S&P 500 and the Nasdaq-100 lost 0.3% and 0.5%, respectively.The nuclear energy company and developer of small modular reactors (SMRs) is seeing its shares pressured by major selling from one of its largest shareholders.Fluor is selling SMR stockEngineering and construction company Fluor was an early investor in NuScale and is one of its largest shareholders. The two comp ...