Archives of Directives

Single-Failure Criterion

Safety-class systems are able to perform all required safety functions for a design basis accident (DBA) in the presence of the following: Any single detectable failure within the safety-class systems concurrent with all identifiable but undetectable failures. All failures…
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Definition 1

Safety-class systems are able to perform all required safety functions for a design basis accident (DBA) in the presence of the following:

  • Any single detectable failure within the safety-class systems concurrent with all identifiable but undetectable failures.
  • All failures caused by the single failure.
  • All failures and spurious system actions that cause, or are caused by, the DBA requiring the safety-class system function.

The single failure could occur prior to, or at any time during, the DBA for which the safety system is required to function.

CategoriesAdministration, Safety
Term OPIAU - Office of Environment, Health, Safety and Security
Definition typeDefinition
RelatedSources

Source 1:

DOE G 420.1-1A, Nonreactor Nuclear Safety Design Guide for use with DOE O 420.1C, Facility Safety
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