OAK RIDGE, Tenn. (AP) — Nuclear operations were temporarily halted Wednesday at a Tennessee complex that stores and processes uranium after three protesters, including a nun, were able to intrude into a high-security area over the weekend. The Y-12 National Security Complex said all nuclear material is safe. The temporary stand-down was expected to end by next week. Special nuclear material will be moved to vaults on site, and contractor security personnel will undergo training and refresher instruction. The protesters were found hanging banners in the dark and singing on Saturday and offering to break bread with the security guards...