David Lochbaum, Director of the Nuclear Safety Project at the Union of Concerned Scientists (UCS), recently published NRC and Nuclear Power Plant Safety in 2011: Living on Borrowed Time, describing 15 near-misses at U.S. atomic reactors in 2011 alone. Note that 4 near-misses took place at reactors belonging to one nuclear utility, Entergy: 2 near misses at Palisades in Michigan, and 2 at Pilgrim in Massachusetts. (Yet another near-miss occurred at Cooper in Nebraska, owned by Nebraska Public Power District, but with support services provided, yet again, by Entergy.)
The Thom Hartmann Show interviewed Dave Lochbaum about his report.
On March 7th, Lochbaum and Edwin Lyman, senior scientist at UCS's Global Security Program, released a report entitled U.S. Nuclear Power Safety One Year After Fukushima. Lochbaum and Lyman summarized their findings in a special published by CNN.