The plant halted operations on April 18 for its annual maintenance.
The power plant utilizes BWR technology, a type of light water nuclear reactor used for the generation of electrical power.
Clab, the temporary storage facility for spent nuclear fuel from all Swedish reactors, is also located at the site.
The Dusseldorf-based company E-ON, controls 55% of the Oskarshamn plant along with its Finnish partner Fortum Oyj which owns the rest, reports Bloomberg.
