The aging Chalk River nuclear reactor was back up and running on Saturday after an unplanned shut down which had triggered worries of a possible medical isotope shortage. Atomic Energy of Canada Limited said repairs had to be made to the fuel rod flask – which fuels and de-fuels the reactor. “The Fuel Rod Flask was returned to service during the evening of November 22,” it said in a statement issued Saturday. “AECL has begun processing and will resume supplying molybdenum-99 to its customer, Nordion Inc., over the weekend.”

Read more here.