One of the most serious problems the company faces is at two nuclear power plants in Fukushima prefecture. The company said an explosion at the Fukushima Daiichi Nuclear Power Station Unit 1 caused by an aftershock sent four workers to the hospital. The company is still assessing damage to the facility, it said in a statement, while local news reports indicate the reactor remains intact, and that outer buildings were damaged by the blow.

"We are presently checking on the site situation of each plant and effect of discharged radioactive materials," the company said.

Japanese DRAM maker Elpida Memory says the earthquake and tsunami had little impact on its operations because they're so far away from the temblor. Elpida's main chip factories are in Hiroshima, in the western part of Japan, while the earthquake's epicenter was in the northeast.

The earthquake "had very little impact. No wafers were scrapped and the operation has been back to normal," said Kumi Higuchi, a representative from Elpida.

She said one factory, Akita Elpida, used to test finished chips for defects and package them inside protective material, is being affected by blackouts. However, Elpida doesn't believe this will impact its operations because most of its chips are sent to Taiwan for testing and packaging.