Figure 3-4. Flowchart for performing a nd accident analysis

DOE-STD -3009-94

Figure 3-4. Flowchart for performing a nd accident analysis.

For example, if an operator is supposed to push Button Z to stop an accident

progression, the accident analysis needs to make it clear that the operator can

actually do so. Making it clear may simply involve noting there is no physical

phenomena associated with the accident that would preclude him from doing so.

Likewise, basic assurance must be provided that equipment relied upon in

unusual or severe environments will function. This assurance does not constitute

the need for or expectation of full, formal environmental qualification.

The above guidance is not meant to imply that the DSA must contain detailed

validations for all assumptions. The DSA needs to present information at a level

that is considered sufficient for review a nd approval of the DSA. Referencing an

auditable trail of information as part of the controlled supporting documentation

is acceptable.

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