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Calculated Impact Frequency.
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DOE Standard Accident Analysis For Aircraft Crash Into Hazardous Facilities
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Methodology for Aircraft Crash Release Frequency Evaluation.


DOE-STD-3014-96
Step 21. If the total impact frequency is below the guideline value, the safety risk is
below the level of concern; stop the analysis and document the results. If the total impact
frequency is greater than the guideline value, it is necessary to identify the aircraft
categories/subcategories to be used for the structural response and release frequency
analyses. A certain amount of judgment is required in making this selection. It is
recommended that the analyst interact with the facility structural engineers and/or
analysts to identify a subset of those aircraft categories/subcategories that are significant
contributors to the impact frequencies.
Methodology for Aircraft Crash Release Frequency Screening. The assessment of
5.4
impact frequency, as evaluated above, assumes that all impacts will lead to facility
damage and a possible release of radioactive or hazardous chemical material. This
assumption is due to the lack of information about the response of the structure to impact
during the impact frequency stage of the analysis. Following completion of the structural
analysis, as described in Chapter 6, it is possible to determine the initial release
frequency, which is the total impact frequency minus the impact frequencies of the aircraft
categories/subcategories shown to have little or no effect on the facility, i.e., will not lead
to a release. This section explains the process of calculating the initial release frequency
using results from the structural analysis.
The approach for the initial release frequency analysis is to exclude those aircraft
categories/subcategories that are known and/or shown by the structural response
analysis to inflict little or no damage should they impact the facility. The major
assumption in this analysis is that if any of the impact locations analyzed in the structural
response analysis for a particular aircraft category/subcategory can be shown to cause
sufficient damage to lead to release, then all impact locations will lead to a release. This
simplifies the analysis. The screening is performed in the following steps:
Step 1. From the structural response analysis results, identify the aircraft
categories/subcategories whose impact into the facility would result in little or no damage
to the facility, i.e., would not result in a release.
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