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Chapter 4 Safety Structures, Systems, and Components


DOE-STD -3009-94
3 . 4 . 3 Beyond Design Basis Accidents
The Rule requires consideration of the need for analysis of accidents which may
be beyond the design basis of the facility to provide a perspective of the residual
risk associated with the operation of the facility The beyond DBAs serve as bases
for cost-benefit considerations if consequences exceeding the Evaluation
Guideline are identified in the beyond DBA range. However, such cost-benefit
analysis would be performed outside the DSA with the concurrence of DOE.
It is expected that beyond DBAs will not be analyzed to the same level of detail
as DBAs. The requirement is that an evaluation be performed that simply
provides insight into the magnitude of consequences of beyond DBAs (i.e.,
provide perspective on potential facility vulnerabilities). This insight from
beyond DBA analysis has the potential for identifying additional facility features
that could prevent or reduce severe beyond DBA consequences. For nonreactor
nuclear facilities, however, the sharp increase in consequences from DBA to
beyond DBA is not anticipated to approach that found in commercial reactors
where the beyond DBA precedent was generated. No lower limit of frequency
for examination is provided for beyond DBAs whose definition is frequency
dependent. It is understood that as frequencies become very low, little or no
meaningful insight is attained.
Operational beyond DBAs are simply those operational accidents with more
severe conditions or equipment failures than are estimated for the corresponding
DBA. For example, if a deterministic DBA assumed releases were filtered
because accident phenomenology did not damage filters, the same accident with
loss of filtration is a beyond DBA. The same concept holds true for natural
events, but beyond DBAs are defined by the initiating frequency of the natural
event itself (i.e., frequency of occurrence less than DBA frequency of
occurrence). Beyond DBAs are not evaluated for man- made external events.
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