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Page 114:
"from 1962 to 2010 the probability of aminor or severe accident at a reactor decreased by afactor of 2.5"
With 3rd and 4th gen reactors you can expect even further reduction.
Also:
"Three calculations resulted in 1 accident in more than 200,000 reactor years, and a further three resulted in 1 accidentin 11,000–25,000 reactor year"