Risk Categorization

 Risk Categorization -     The completion of the initial Preliminary Hazard List (PHL) permits categorization of the planned facility into risk categories. Categorizing is based on several factors, such as number of people exposed, type and degree of inherent hazard of operation, vulnerability, and cost. Inputs include whether or not the facility is “one of a kind” or a standard design and how it impacts the rest of the installation. For example, the failure or destruction of a facility used to house emergency power or one through which communication lines run may shut down an entire airport or region. The designation should reflect the local concern for operational safety and health risks presented by the facility and its mission. It is critical that the appropriate risk categorization be applied in each instance. 
Initial Risk 
Categorization 
Facility’s Mission 
Energy Sources ! Type ! Magnitude 
Occupancy 
Lessons Learned 
Low 
Medium 
High
Low-risk facilities; i.e., housing, and administrative buildings. In these types of facilities, risks to building occupants are low and limited normally to those associated with everyday life. Accident experience with similar structures must be acceptable, and no additional hazards (e.g., flammable liquids, toxic materials, etc.) are to be introduced by the building occupants. Except in special cases, no further system safety hazard analysis is necessary for low risk facility programs. 
Medium-risk facilities; i.e., maintenance facilities, heating plants, or benign facilities with safety critical missions such as Air Traffic Control (ATC) buildings. This group of facilities often presents industrial type safety risks to the building occupants and the loss of the facility's operation has an impact on the safety of the NAS. Accidents are generally more frequent and potentially more severe. A preliminary hazard analysis (PHA) is appropriate. System hazard Analysis (SHA) and Subsystem Hazard Analysis (SSHA) may also be appropriate. The facility design or systems engineering team members are major contributors to these analyses. User community participation is also important.
High-risk facilities; i.e., high-energy-related facilities, fuel storage, or aircraft maintenance. This category usually contains unique hazards of which only an experienced user of similar facility will have detailed knowledge. Because of this, it is appropriate for the user or someone with applicable user experience to prepare the PHA in addition to the PHL. Additional hazard analyses (e.g., system, subsystem, operating and support hazard analyses may be required). 

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