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A lot of information about the study object is required, in particular for detailed analyses. Information sources of interest may include (e.g. see IAEA 2002):

 System layout drawings, including the relation to other systems and assets.

 System flow, logic, and control diagrams.

 Descriptions of normal and possible abnormal operations of the study object.

 Inventories of hazardous materials.

 Operation procedures and operator training material.

 Testing and maintenance procedures.

 Emergency procedures.

 Previous risk assessments of the same or similar systems

 Descriptions of engineered safety systems (barriers) and safety support systems, including reliability assessments.

 Description of previous hazardous events and accidents in the study object.

 Feedback from experience with similar systems.

 Environmental impact assessments (if relevant).

The document control system fills an important role in keeping track of all the documentation that is used as input to the risk assessment. In system development projects, the design is developing continuously, and it is important to know which versions of documents have been used as basis for the analysis.