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LLNL Emergency Plan Rev-23 October 2017 • Ensure appropriate on-scene evaluations and recommendations are communicated to the LEDO/ED • Confer with the LEDO/ED on emergency classification and the need for offsite notification The initial assessment of the EMDO may be augmented by the consequence assessment team based on EAL data evaluation from predefined incident scenarios for the facility and/or operations described in the associated EPHA. 7.1.2 Timely Initial Assessment Within about the first thirty minutes of the response, assessments should be performed leading to an estimate of the upper bound of the potential consequences of the release. If this assessment is completed in a timely manner, it may provide additional data for determining the appropriate classification of the Operational Emergency. To aid in the timeliness of information, the results should be based upon pre-calculated results and upon simplified calculation methods including computer codes and calculated values. These actions may be initiated by First Responders and may be augmented with the continuous assessment process once the consequence assessment team and ERO staffs are available. 7.1.3 Continuous Assessment Continuous consequence assessment consists of re-evaluation as additional information is gathered and emergency conditions become better defined. This process is ongoing through recovery and return to normal operations in accordance with Emergency Programs Organization plans/procedures. This process ensures that the data is available for decision-makers to ensure that appropriate protective actions are maintained and adjusted as needed. The mitigative or ameliorative progress is monitored and communicated to the affected parties. This process is similar to the timely initial assessment process, but is cyclical, with increasing levels of sophistication in the analysis tools, input accuracy, technical expertise, and field monitoring feedback. Additionally, sensitivity analyses (such as release impacts from changes in atmospheric conditions) may be performed to determine which potential indicators could trigger recasting of decisions related to protective actions. Consequence assessment during recovery and planning for the return to normal operations can include continued environmental sampling to verify the effectiveness of restoration activities. Consequence assessment is also performed to minimize the further spread of hazardous materials. Final measurements demonstrate that consequences from the hazardous materials release are reduced to acceptable levels, or specific areas isolated, during recovery. 77