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Nuclear Exposure Evaluation.
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DOE Standard Accident Analysis For Aircraft Crash Into Hazardous Facilities
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Dispersion Modeling and Consequence Assessment.


DOE-STD-3014-96
APPENDIX D
credit for these systems should not be taken unless it can be clearly
supported by analyses.
It is not expected that an explosion will occur except in the case of
systems having an existing explosive potential, such as an ion exchange
column or weapons components. Where such systems exist and are
subject to events with the potential to act as initiators, an explosion will be
assumed to occur. Such explosions may serve as initiators for
subsequent releases beyond those expected from the aircraft crash itself,
particularly in cases where kinetic energy released from an explosion has
the potential to impact material that otherwise would not be impacted (e.g.,
material not within areas directly impacted by aircraft debris). Therefore,
postulating an explosion requires a re-evaluation of damage ratio
assumptions, since explosions may disable barriers otherwise assumed to
function, and may produce secondary energetic effects (e.g., due to
shrapnel or collapsing structural members). For example, fire barriers on
robust containments that would otherwise remain intact may be breached
or compromised.
c.
ARFij/ARRij/RFij - Bounding values for nuclear materials are based on
guidance developed by the U.S. Department of Energy (Reference 1). The
use of bounding values, as opposed to best estimates, is specified due to
the variability and limited quantity of experimental data from which
analytically useful values can be derived. In addition, due to the limited
data available, the variety of experimental conditions from which individual
bounding values are derived, and the general lack of precise
correspondence between experimental conditions and conditions assumed
for analysis, statistical analysis is not considered appropriate when using
data from DOE-HDBK-3010-94 for the purpose of aircraft crash
evaluations. Specific applications considered inappropriate include the
use of best estimate values or the
D-2


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