SSC Functionality Evaluation.

DOE-STD-3014-96

6.3.4

SSCs that are supported by target structures should be evaluated for

aircraft impact-related vibratory loads. Such an evaluation consists of

(1) generation of instructure vibratory motion at SSC support locations

resulting from impact force time-history; (2) structural evaluation of SSC

supports, including anchorage; and (3) evaluation of the SSC

functionality. Both support and SSC functionality evaluation can be

performed either by analysis or by testing.

For evaluation by analysis, the SSCs can be modeled, analyzed, and

evaluated in accordance with the applicable industry-accepted dynamic

analysis methods and acceptance criteria for safety-related SSCs, such

as those given in ASCE-4, ASME Boiler and Pressure Vessel Code,

IEEE-344, and NUREG-0800 (References 12, 13, 14, and 15),

recognizing that impact of some aircraft may generate vibratory loads with

more high frequency contents than those from typical seismic loads.

For evaluation by testing, the SSCs can be subjected to shake table

testing, using the instructure spectra generated from transient response

analysis as input spectra and following the methods described in

IEEE-344.

Evaluation of Earth-covered Structures.

6.3.5

Penetration of a rigid missile into earth media can be determined using

analytical or empirical formulas, which provide good agreement with test

data. Because most of the tests have been performed using ballistic

missiles, care should be exercised in applying the formulas to aircraft

missiles.

If the earth cover exceeds 1.2 times the penetration depth calculated by

assuming a rigid missile, the missile should be assumed not to directly