[en] New guidance to the safety analyst has been developed at the Rocky Flats Environmental Technology Site (RFETS) in the form of the new Safety Analysis and Risk Assessment Handbook (SARAH). Although the older guidance (the Rocky Flats Risk Assessment Guide) continues to be used for updating the Final Safety Analysis Reports (FSARs) developed in the mid-1980s, this new guidance is used with all new authorization basis documents. With the RFETS mission change in the early 1990s came the need to establish new authorization basis documents for its facilities, whose missions had changed. The methodology and databases for performing the evaluations that support the new authorization basis documents needed to be standardized, to avoid the use of different approaches and/or databases for similar accidents in different facilities. This paper presents this new standardized approach, the SARAH