A sign is seen outside the reactor at the Atomic Energy of Canada Limited (AECL) nuclear facility in Chalk River, Ontario in this December 19, 2007 file photo. Widespread sloppiness at both Canada's nuclear regulator and government-owned AECL prompted the damaging closure of the 50-year-old Chalk River reactor which made medical radioisotopes, a report said on July 29, 2008. REUTERS/Chris Wattie/Files (CANADA)
REUTERS/CHRIS WATTIE