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Remedial investigation of the 300 Area Process Ponds was initiated in 1987 in accordance with the then existing U.S. Department o f Energy (DOE) Comprehensive Environmental Response, Compensation, and L ability Act (CERCLA) Program described in DOE Order 5480, Chapter 14. Subsequently, the Hanford Site was proposed as a candidate for inclusion on the U.S. Environmental Protection Agency's (EPA) National Priorities List (NPL). Nomination to the NPL requires compliance with the CERCLA/SARA (Superfund Amendments and Reauthorization Act) Remedial Investigation/Feasi bil ity Study (RI/FS) process. Consequently, further investigations in the 300 Area will proceed with an EPA-approved RI/FS Work Plan and according to provisions contained in the Hanford Federal Facility Agreement and Consent Order. report will be used in preparing RI/FS Work Plans for the 300 Area Operable Units. suitability for future use as RI input.

The fallout from a nuclear explosion has the potential to injure or kill 100,000 or more people through exposure to external gamma (fallout) radiation. Existing buildings can reduce radiation exposure by placing material between fallout particles and exposed people.Lawrence Livermore National Laboratory was tasked with developing an operationally feasible methodology that could improve fallout casualty estimates. The methodology, called a Regional Shelter Analysis, combines the fallout protection that existing buildings provide civilian populations with the distribution of people in various locations. The Regional Shelter Analysis method allows the consideration of (a) multiple building types and locations within buildings, (b) country specific estimates, (c) population posture (e.g., unwarned vs. minimally warned), and (d) the time of day (e.g., night vs. day). The protection estimates can be combined with fallout predictions (or measurements) to (a) provide a more accurate assessment of exposure and injury and (b) evaluate the effectiveness of various casualty mitigation strategies. This report describes the Regional Shelter Analysis methodology, highlights key operational aspects (including demonstrating that the methodology is compatible with current tools), illustrates how to implement the methodology, and provides suggestions for future work.

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