Nuclear officials in Japan implementing safety measures

After notching a rare victory by stopping highly radioactive water from flowing into the Pacific, workers at Japan’s flooded nuclear power complex turned to their next task: injecting nitrogen to prevent more hydrogen explosions.

Nuclear officials said there was no immediate threat of explosions like the three that rocked the Fukushima Dai-ichi plant not long after a massive tsunami hit on March 11, but their plans are a reminder of how much work remains to stabilise the complex.