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IAEA has no "NDA with member states" and surely not for accidents. Quite the opposite, all countries must not only report even slightest accidents to IAEA but also allow periodic inspections.
And yes, there were two more workers killed in an accident in Japan in 1999. At the same time thousands of workers died in accidents in coal mines, power plants and while installing solar panels and wind turbines. So why are you singling out nuclear industry specifically?