Nuclear Regulatory Commission Chairman Gregory B. Jaczko, photographed in December, on Capitol Hill. (Andrew Harrer/Bloomberg)

Embattled Nuclear Regulatory Commission Chairman Gregory B. Jaczko announced Monday he’s stepping down after three rocky years at the helm of the nation’s nuclear safety agency.

As colleague Steve Mufson and I write Monday, his resignation “signals that he had lost the support of his former boss, Senate Majority Leader Harry M. Reid (D-Nev.), a fierce opponent of efforts to store nuclear waste at Nevada’s Yucca Mountain, a key concern of the nuclear agency.”

Also of note: “Several congressional aides had said that Jaczko would resign only if Reid signaled that he could no longer give him political support. Aides reached Monday confirmed that diminishing support for Jaczko on Capitol Hill was a factor, but they also cited Jaczko’s desire to move on amid the allegations.”

Read our full take on Jaczko’s departure — and the dramatic congressional hearing that first publicly exposed many of the concerns — by clicking here.

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