Gregory Jackzo was outvoted when he opposed the approval of new US reactors in February

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U.S. Nuclear Regulatory Commission Gregory Jackzo Gregory Jaczko United States Asia East Asia Japan

Gregory Jackzo was outvoted when he opposed the approval of new US reactors in February

Mark Wilson

Chairman of the US Nuclear Regulatory Commission (NRC) Gregory Jaczko, seen here in March, has announced his resignation, just months after a public spat with colleagues over the need for binding rules in the wake of Japan's disaster.