The National Nuclear Security Administration (NNSA) furloughed around 1,400 employees, 80 percent of its workforce, with only 375 exempted as critical personnel that will still come into work Monday. A source told Defense Daily sister publication the Exchange Monitor Monday the current focus is keeping the Y-12 National Security Complex and Pantex Plant running since both sites run out of funding first. NNSA is requesting additional funding and authorities for the other sites, though. The source added it is unclear…