ANALYSIS-Fukushima to slow, not stop, nuclear growth

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* U.N. atomic agency still sees "significant" expansion

* Greenpeace criticises IAEA's "unrealistic optimism"

* Siemens quits atomic power after Germany's policy U-turn

* But U.S. India, others reaffirm commitment to nuclear energy

By Fredrik Dahl

VIENNA, Sept 22 (Reuters) - Environmental group Greenpeace calls it a "dying and dangerous" industry and Europe's biggest engineering conglomerate, Siemens, is exiting the sector altogether.

Japan's Fukushima nuclear accident six months ago sparked doubts about the future of nuclear power across the globe and especially in Europe, highlighted by Germany's decision to quit the energy source and Italy's referendum to ban it for decades.

But in a sign that the worst such disaster in a quarter of a century may slow rather than stop nuclear energy growth, other big economic and political powers used a U.N. meeting this week to reaffirm their commitment to atomic energy.