Updates
** Shares of nuclear energy companies rise following the United States' attack on three of Iran's main nuclear sites
** President Donald Trump said late on Saturday U.S. forces struck Iran's three main nuclear sites, joining Israel's military campaign aimed at preventing Tehran from building an atomic weapon
** If the Middle East conflict escalates, it could lead to broader geopolitical instability and affect uranium supply from key producer Kazakhstan, prompting countries to look elsewhere to secure uranium
** Uranium producers rise: Uranium Energy UEC.A up 2.9%, Centrus Energy LEU.A up 5.5% and Energy Fuels UUUU.A up 1.5%
** Small nuclear reactor developer NuScale Power SMR.N up 5%
** Meanwhile, shares of nuclear utility Constellation Energy CEG.O rise 3.2%, after the Wall Street Journal reports New York is planning to construct a nuclear-power facility, the first major new U.S. plant in over 15 years
(Reporting by Sumit Saha and Katha Kalia in Bengaluru)
((Sumit.Saha@thomsonreuters.com;))