Abstract
The US Nuclear Regulatory Commission (NRC) has recently completed an updated Spent Fuel Transportation Risk Assessment, NUREG-2125. This assessment considered four types of accidents that could interfere with routine transportation of spent nuclear fuel: those in which the spent fuel cask is not affected, those in which there is loss of lead gamma shielding, those in which radioactive material is released and those that could result in a criticality event. The probability of a particular type of accident is the product of the probability that the vehicle carrying the spent fuel cask will be in an accident and the conditional probability that the accident will be of a certain type. An accident in which the spent fuel cask is not damaged or affected at all is the most probable: 99·95% of vehicle accidents are less severe than the regulatory hypothetical accident, and most accidents that are more severe than this still do not lead to loss of shielding or release, which occur in fewer than one accident in a b...
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