Guardian: The immediate future of the world’s biggest nuclear power station was in doubt today after its eighth fire since it was closed almost two years ago by an earthquake. Quake damage at the plant in 2007. Photograph: Koichi Kamoshida/Getty Images The fire at Kashiwazaki-Kariwa power station in Japan came as its operators await local authorities’ approval to restart one of its seven reactors. A 39-year-old worker received slight burns in the fire, which was quickly put out …