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LLNL Emergency Plan Rev-23 October 2017 7 CONSEQUENCE ASSESSMENT Consequence assessment is the DOE-defined process used to evaluate the impacts of a release of radioactive or other hazardous materials. Consequence assessment at LLNL is an ongoing process that begins with recognizing that an incident has occurred, continues through various phases of response to the incident, and concludes with cleanup and remediation. As such, the process includes performing timely initial assessments of plume projection consequences necessary to support initial decisions and the continuous process of refining those initial assessments as more information and resources become available. 7.1 Consequence Determination Consequence assessment is conducted in three phases during the response to a hazardous material incident: • Upon recognition of the emergency, tabulated results of consequence calculations from the appropriate EPHAs and related EALs provide guidance in making an initial worst- case estimate of the consequences. • The timely initial worst-case assessment is performed in the initial stage of response using the worst-case source term from the EAL and current meteorological conditions to project event-specific plume consequences. • The continuous assessment phase follows the timely initial assessment and continues throughout the response and mitigation. Modeling performed in this phase is supplemented by refined source term data gathered by the EOC, revised meteorological data, and data gathered by the Field Monitoring Teams deployed by the EOC Operations Section. This will ensure that, as the event unfolds, changes in variables associated with consequence assessment are addressed and updated. 7.1.1 Initial Consequence Assessment When there is an incident or the imminent potential for an incident that might release significant quantities of radioactive materials or other hazardous materials, the EMDO, with guidance from the EALs in the EMDO Handbook, makes a preliminary consequence assessment. The EALs provide input for event detection, recognition, categorization and classification. Based on the assessment, the EMDO will consult with the Battalion Chief or SDO and: • Initiate protective actions, if warranted, for emergency responders and affected onsite facilities and personnel • Recommend protective actions, if appropriate, to offsite agencies 76