A report commissioned by the Swiss canton of Basel-Stadt, published in 2007, concluded that the previous seismic evaluations undertaken by both EDF and, to a lesser extent, by the "Institut de radioprotection et de sûreté nucléaire" (Radioprotection and Nuclear Safety Institute, IRSN) had underestimated the risks involved. In particular, although the location of the fault in the Rhine Rift Valley that led to the 1356 Basel earthquake was sufficiently well known for national and regional purposes, its location was not known precisely enough to evaluate a particular site. Studies conducted by other scientists have, for example, reached different conclusions about which faults might have been involved in the 1356 earthquake, its magnitude (ranging from 6.0 to 7.1 on the moment magnitude scale), and the distance from the fault to the plant (ranging from to away, compared to the distances of and used by EDF and the IRSN respectively). EDF also failed to take into account the possibility of a moderate local earthquake, which may have the potential to do greater damage than one which is larger but more distant, and the report was also critical of some aspects of the RFS 2001-01 assessment requirements. The report found that the design standards in force when the plant was built were similar to those that apply to present-day public buildings: the plant had been designed to accommodate movement, but it was not possible to determine whether or not the safety margins used would be adequate if a more realistic seismic evaluation were to be used.