Local Response Evaluation

DOE-STD-3014-96

hazardous material, the location of the affected material, and the

failure modes that could lead to the release.

b. For each target SSC or its barrier selected above, more than one

impact location should be considered so that the worst adverse

effects can be determined. It is possible that the impact location that

produces the worst global response is different from the location that

produces the worst local damage or SSC functional failure.

c. The angle of impact should be based on the orientation of the SSC or

barrier being evaluated, the worst impact angle from SSC/barrier

vulnerability considerations, and the most probable angle of impact for

the aircraft subcategory to which the critical missile belongs.

Local Response Evaluation. The local response of the target will be initiated with

6.3.2

spalling and subsequently result in penetration, scabbing of target material from

the back face of the target, and the eventual perforation of the target, transporting

the missile through the target (Figure 3).

Empirical formulas validated by tests have been used to predict these local

responses for predominantly rigid (nondeformable) missiles (see Table I). Empirical

formulas are for the case of normal (90-degree) impact. When the impacting

missile strikes normal to the target face, the local responses are maximized. The

angle of strike can substantially influence the extent of local damage and should be

appropriately considered. For further guidance see the technical support

document for SSC evaluation (Reference 1).

Typically, spalling is not of any safety concern, and it is sufficient to evaluate

safety-related targets against only scabbing and perforation (i.e., full penetration)

using the methods provided herein. If the results of such evaluation do not meet

Section 4.3 guidelines, it is not necessary to perform global response or building

collapse evaluation, and the evaluation should proceed to consequence analysis in

accordance with Chapter 7.