not be allowed for fire suppression systems unless an explicit analysis shows that
they will remain effective.
Is the force of any explosion capable of causing further barriers to be damaged or
destroyed? Can it cause additional fires and/or explosions in the facility? Again,
credit can be taken for the dissipation of explosive energy by existing barriers, if
they have not been damaged by the crash. Credit can also be taken for diversion
of the explosive force through breaches caused by the crash, thus reducing the
shock to intact barriers. The basis for taking credit should be documented. Again,
characterization of the explosive force generated relative to barrier strength and
the force transmitted to collocated explosives is required to justify the credit.
Step 4. Based on the findings of the previous step, determine if a release could occur,
given the scenario as defined. Again, specific guidance cannot be provided, but the
following questions should guide the analyst's thinking:
Could any of the material at risk in the facility be impacted by any release
mechanism (e.g., shock, fire, explosion) as a result of the scenario? The answer
to this question should be "yes" if there is any material that is not separated from
the energy available from the release mechanism by an intact barrier capable of
dissipating that energy.
Could the primary confinement around any of that material be breached as a result
of the scenario? The answer to this question should be "yes" if the structural
integrity of the primary confinement is degraded below that required under accident
conditions and if there is a driving force capable of causing the material to migrate
through the breach.
Could a path to the atmosphere result from the scenario? The answer to this
question should be "yes" if there are no longer any intact barriers between the
material and the atmosphere, assuming that the primary confinement is failed and
that there is a driving force capable of causing the material to migrate along the