terminated and the results documented. Otherwise, go to the Structural Evaluation for
Release Frequency Screening (see Section 6.3).
If there are safety-related SSCs in the vicinity of impact locations, identify the nonsafety-
related SSC locations which are not vulnerable to aircraft impacts. These locations need
not be further evaluated. Go to the Structural Evaluation for Release Frequency
Evaluation (see Section 6.3).
Structural Evaluation. If there are building-supported safety-related SSCs in the vicinity of
the impact locations, or if the entire structure does not meet the structural response
guidelines for Structural Screening, a more detailed structural evaluation is necessary.
The structural evaluation is performed leading up to either a Release Frequency Screening
or Release Frequency Evaluation. Outlines of the structural evaluation for Release
Frequency Screening and Release Frequency Evaluation are given in Figures 2a and 2b,
respectively. Details for implementing the evaluation are given in this section.
The structural evaluation process involves the following steps:
Step 1. Identify locations for evaluation. Prepare a list of potential aircraft impact
locations (see Section 6.2 Step 1). Include locations associated with building-supported
safety-related equipment, but delete any location that has been screened out by the
Step 2. Identify critical missiles. Identify a set of missiles to be used for the structural
response evaluation for Release Frequency Screening by either (1) performing
category/subcategory aircraft hazard analyses (see Situation 1, Section 2.1 of
Reference 1) for all applicable aircraft categories/subcategories as identified in the impact
frequency evaluation (see Section 5.3), or (2) selecting appropriate aircraft as discussed in
Section 6.3.1, keeping in mind that a pair of bounding aircraft types must be identified for
each applicable aircraft category/subcategory.
For the Release Frequency Evaluation, the identification of a set of missiles to be used for
the structural evaluation can be done by either (1) selecting a set of aircraft types for each