METHODOLOGY FOR EVALUATING THE INTEGRITY OF STRUCTURES, SYSTEMS,
AND COMPONENTS SUBJECTED TO AIRCRAFT IMPACT
Purpose. This chapter establishes a methodology for deterministically evaluating the
structural integrity of targets (or barriers) and the functionality of safety-related structures,
systems, and components (SSCs) in a facility that may be subjected to impact from one or
more subcategories of aircraft with frequencies greater than frequency guidelines. It also
provides the technique for selecting critical missiles from the site-specific list of aircraft
that may potentially impact the facility.
The design/evaluation procedures in this chapter are generally conservative and
consistent with nuclear power industry practices. However, the use of a more precise
and detailed methodology is not precluded if the intent of this chapter is satisfied.
Alternative methods and technical discussions are provided in Appendix C, and the
justification for these recommended methods and examples is provided in Reference 1.
Adverse Effects. The following potential adverse effects of a missile impact on a
target should be considered:
Local Structural Damage: A missile may hit a target, causing excessive
local damage (i.e., penetration and spalling, scabbing, perforation).
Global Structural Damage: When subjected to the impact from a
missile, a target may undergo excessive structural deformation or
displacement (without collapse) or may structurally collapse or overturn.
Functional Failure of SSCs: When a building structure is impacted,
attached SSCs in close proximity to the impact location may be
subjected to shock and vibration, resulting in their functional failure.