SHANGHAI — The Chinese government said on Wednesday that “about five” of the uranium fuel rods inside a nuclear power plant in southeastern China had been damaged, but added that no radiation had leaked out of reactors at the site.

Regulators have also reviewed and approved limits on how much radioactive gas is allowed to accumulate in the water at the reactor, China’s National Nuclear Safety Administration said in a statement. Nuclear scientists in the United States and Europe said in interviews earlier this week that a buildup of radioactive gas in the water and steam surrounding the fuel rods, while not uncommon at reactors elsewhere, is often a sign of poor design, manufacturing or management.

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