(Updates, adds context, recasts throughout) ** Shares of Centrus Energy tumble 30% to $79.59 on Mon after co announces convertible debt deal plans, and U.S. regulators rejected data center deal between Amazon.com and Talen Energy

** LEU on track for biggest one-day pct decline in two years ** Early Mon, the Bethesda, Maryland-based nuclear fuel supplier said it's offering privately $350 mln 6-yr convertible bonds for investment in technology development or deployment, debt paydown, capex, potential acquisitions ** Late Fri, Federal Energy Regulatory Commission (FERC) rejected an amended interconnection agreement between AMZN and electric utility TLN to increase capacity from a nuclear power plant in Pennsylvania to one of the internet retail giant's data centers

** With move on session, LEU has shed ~$500 mln of market cap to ~$1.3 bln, per LSEG data ** On Oct 18, LEU jumped ~22% to close at $98.59, a day after co was awarded uranium production contract by U.S. DOE for new reactors ** Stock ended Sept at $54.85. It had received a boost as likes of AMZN and Alphabet's Google inked deals last month to develop nuclear power technology to meet surging demand from data centers

(Lance Tupper is a Reuters market analyst. The views expressed are his own) ((lance.tupper.thomsonreuters.com@reuters.net lance.tupper@tr.com 1-646-279-6380))