The government’s nuclear inspections agency admitted Tuesday it failed to identify cracks in the core shroud of the Hamaoka No. 4 reactor operated by Chubu Electric Power Co., even though it detected telltale signs in 2001.

The failure is detailed in a report by the Industrial and Nuclear Safety Agency, which investigated a series of defects following revelations in August that Tokyo Electric Power Co., Japan’s leading power utility, covered up similar reactor faults.

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