As reported by Lindsey Smith at Michigan Radio, around 185 workers at Entergy's Palisades atomic reactor in Michigan were exposed to 2.8 Rem of radioactivity exposure on a single project last year. From Feb. to March, 2014, the Control Rod Drive Mechanisms at Palisades were replaced, due to chronic seal and through-wall leakage that dates back to 1972.
2.8 Rem of exposure violates Entergy's self-imposed ALARA (As Low As Reasonably Achievable) limits of 2 Rem/year for workers. 2 Rem/year for nuclear workers is the national standard in Germany, which will completely phase out reactor operations by 2022 as a direct response to the Fukushima nuclear catastrophe.
However, the U.S. Nuclear Regulatory Commission allows, or permits, up to 5 Rem/year of exposure to nuclear workers. Members of the general public, by comparison, are only allowed to receive 100 milliRem, or 0.1 Rem, per year of exposure to artificial radioactivity from the nuclear power industry. Thus, in a single month, 185 workers at Palisades were exposed to 28 times the amount of harmful radioactivity allowed for members of the general public in an entire year.
Note that while MI Radio initially reported that 185 workers were involved in the incident, Entergy Nuclear's Site Vice President, Anthony Vitale, confirmed at the Jan. 13th regulatory conference that 192 workers were involved.