WASHINGTON, Jan. 27 -- The U.S. Department of Energy Pacific Northwest National Laboratory issued the following news: * * * Nuclear Waste Transformed: PNNL Scientists Solidify History With Glass * RICHLAND, Wash.-In a historic event decades in the making, the Hanford Site recently began immobilizing low-activity, radioactive waste by converting it into glass: a process known as vitrification. The event marked the successful start-up of Hanford's Waste Treatment and Immobilization Plant, or "  more