The Chemical Accident Risk Assessment Thesaurus (CARAT TM): An Internet Tool for Analyzing Risk Assessment Regulations and Approaches. B. Reilly, D. Speights, and A. Santiago, US EPA
Through a cooperative agreement with The Wharton School, EPA has undertaken to develop the Chemical Accident Risk Assessment Thesaurus CARAT TM) to promote understanding and communication of risk assessment processes used by various practitioners and government agencies in the determination of risks associated with accidental chemical releases. The general approach has been to develop an overall characterization of the risk assessment process without using terms of art. The result is a tree-like hierarchy comprised of four generic risk elements: hazard identification; sequence of events leading to release/exposure; source and subject interaction; and basis for estimating likelihood. These generic elements have a varying number of subelements. An internet-based computer system has been designed to capture information from risk assessors on various regulations, guidance documents, and case studies dealing with risk assessment of major accidental releases from fixed facilities. The purpose of this paper is to describe the system and present some example entries from the US EPA and others.
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