The Department of Energy (DOE) and the DOE Natural Phenomena Hazards Panel have developed uniform design and evaluation guidelines for protection against natural phenomena hazards at DOE sites throughout the United States (UCRL-15910). The goal of the guidelines is to assure that DOE facilities car_withstand the effects of natural phenomena such as earthquakes, extreme winds, tornadoes, and flooding. The guidelines apply to both new facilities (design) and existing facilities (evaluation, modification, and upgrading). The intended audience isprimarily the civil/structural or mechanical engineers conducting the design or evaluation of DOE facilities. DOE Order 6430. lA, General Design Criteria Manual, was revised in 1989. This current version of Order 6430. lA references these guidelines (UCRL-15910) as an acceptable approach for design evaluation of DOE facilities for the effects of natural phenomena hazards. UCRL-15910 provides earthquake ground acceleration, wind speed, tornado wind speed and other effects, and flood level corresponding to the design basis earthquake (DBE), design basis wind (DBW), design basis tornado (DBT), and design basis flood (DBFL) as described in Order 6430.1A. Integrated with these natural phenomena Ioadings, UCRL-15910 provides recommended response evaluation methods and acceptance criteria in order to achieve acceptably low probabilities of facility damage due to natural phenomena. iv recent information and techniques available, In any case, to achieve a specified perforrnance goal, hazard annual probabilities of exceedance are specified with design and evaluation procedures that provide a consistent and appropriate level of conservatism.

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Number of Tornadoes Exceeding Threshold Ulndspeeds. . 10 Recommended Tornado and Extreae Wind Risk Hodels for ,. Site 300 '' Values of Penetration Coefficient K for Reinforced Concrete 33 Idealized Resistance-Displacement Function for Ductile Materials 33 Plan View of Example Structure 39 Structural Response of a Reinforced Concrete Hall. . 45 Reinforced Concrete Mall Cross Section 46 Force-Time Function and Resistance Function 46