category/subcategory as outlined above, (2) performing a site-wide basis aircraft hazard
analysis (see situation 2, Section 2. i of Reference 1) to identify a set of aircraft types to
represent all applicable categories/subcategories of aircraft, or (3) selecting appropriate
aircraft types as discussed in Section 6.3.1.
Step 3. Perform structural response evaluations. Sequentially perform structural local
response, global response and SSC functionality evaluations as outlined in Figures 2a and
2b and discussed in Sections 6.3.2, 6.3.3, and 6.3.4, respectively, at all locations except
those previously screened out from consideration. Additional analysis should be
consistent with the analyses associated with the Release Frequency Screening and
Release Frequency Evaluation methods as described in Sections 5.4 and 5.5 respectively.
For Release Frequency Screening, SSC functionality is not evaluated, and global response
is based on the Energy Balance Method discussed in Section 18.104.22.168. For Release
Frequency Evaluation, global response evaluations for locations related to building-
supported safety-related SSCs are based on the Time-History Analysis Method, discussed
in Section 22.214.171.124.
Step 4. Identify categories/subcategories of aircraft. For the Release Frequency
Screening, identify the aircraft categories/subcategories meeting the structural response
guidelines in Section 4.3. These are the aircraft categories/subcategories which inflict
insignificant structural damage upon impact.
For the Release Frequency Evaluation, identify the locations within the facility at which the
impact of a crashing aircraft will inflict insignificant damage and need not be considered in
assessing the effective area of the facility in evaluating impact frequencies.
Step 5. Proceed to the Release Frequency Screening or Evaluation. See Sections 5.4
and 5.5, respectively.