David Lochbaum of the Union of Concerned Scientists, a group that presses for safer nuclear plants, is a former plant engineer.

忧思科学家联盟是一个要求安全核工厂的组织，其成员大卫·洛克博姆曾是一名核电厂工程师。

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"The NRC has repeatedly failed to enforce essential safety regulations, " wrote David Lochbaum, director of the group's Nuclear Safety Project and author of the study.

NPR: Nuclear Chief: US Plants Safer After Japan Crisis

David Lochbaum, the director of the Union of Concerned Scientists' Nuclear Safety Program, during a conference call Monday, questioned the safety of U.S. nuclear plants that rely on batteries to back up the power supplies for cooling systems.

WSJ: Obama Administration Stands Behind Nuclear Power