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Dispersion Modeling and Consequence Assessment.
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DOE Standard Accident Analysis For Aircraft Crash Into Hazardous Facilities
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Definition of Source Terms.


DOE-STD-3014-96
APPENDIX D
simple, straight-line Gaussian dispersion modeling. Guidance on the use of this
and other models can be found in the literature (Reference 2). In addition,
computer codes may be used for modeling material transport and assessing
consequences. Where they are used, their appropriateness should be justified
on a case-by-case basis, recognizing that different codes tend to have different
domains of applicability (e.g., puff releases, explosive releases). Examples of
computer codes that may be appropriate under certain analytical conditions
include the MELCOR Accident Consequence Code System (MACCS)
(Reference 3) and the Explosive Release Atmospheric Dispersion Code (ERAD)
(Reference 4).1
Chemical Exposure Evaluation. A wide variety of chemical releases may potentially
D.2.
occur as a result of an aircraft crash. One of the most critical tasks is to select the vapor
dispersion model that is most appropriate for the accident scenario. Guidance for
characterizing many of the most common types of accident scenarios and for performing
the exposure modeling is provided in References 5 and 6.
D.2.1 Definition of Source Terms. The series of flowcharts in Figure D-1 is intended to
help the analyst clearly define the accident scenario to be modeled. Beginning
on page D-7 of Figure D-1, the analyst should identify which case is most
applicable to the accident scenario being investigated. Page D-7 directs the
analyst to go to another page of Figure D-1 and proceed to identify sections of
references (such as References 5 or 6) or seek expert advice. On subsequent
pages of Figure D-1, the scenarios are broken down into more classes, after
which the analyst is directed to other sections of appropriate references, where
he/she will either find advice on how to model the scenario of interest or be
advised to seek expert advice. Clearly, Figure D-1 is a simple, paper-based
expert system. It can readily be modified to include
1
These computer codes have been listed as examples only. Their identification here does not represent
endorsement of the codes, individually or collectively, nor does it imply blanket acceptance of the codes
that may be used in meeting the requirements of this standard.
D-4


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