This means technological advances in areas such as structural and functional materials, power conversion, and reliability.

CNN: Nuclear fusion is the 'perfect energy source'

"Tepco (Tokyo Electric Power) should continue its efforts to improve the reliability of essential systems, to assess the structural integrity of site facilities and to enhance protection against external hazards, " the International Atomic Energy Agency (IAEA) said on Monday.

BBC: IAEA calls for improvements at Japan's Fukushima plant