Appendix D - Regeneration/Recovery/Documetation of Requirements, Bases, and Engineering Information

DOE-STD-1073-2003

Configuration Management

APPENDIX D - REGENERATION/RECOVERY/DOCUMENTATION

OF REQUIREMENTS, BASES, AND ENGINEERING

INFORMATION

For new construction, i.e., new facilities and major modifications to existing facilities, the

design requirements should be identified and documented as part of the design process.

The design requirements define the facility physical configuration and the functions of its

parts. However, for existing facilities that may lack thorough documentation of the

design basis, the requirements for previously installed SSCs may not be documented or

available. In these cases, it may not make sense from a cost perspective to immediately

reconstruct the design requirements; although the contractor should document the new or

revised design requirements as maintenance and modifications are performed at the

facility or activity. In any event, the contractor must ensure that the SSCs can perform

the safety functions assumed in the DSA. If additional information is needed to establish

the design requirements or to ensure that a SSC is capable of performing its assumed

safety function, this documentation can be obtained by regenerating the information or

interviewing technical experts who are knowledgeable about the particular equipment or

situation.

Maximum advantage should be taken of pertinent existing safety analyses and design

information (i.e., requirements and their bases) that are immediately available or can be

retrieved through reasonable efforts. Missing information can often be found through the

identification and evaluation of existing engineering documents (e.g., drawings,

calculations, analyses, and documented justification to support engineering judgments).

As a part of the evaluation effort described above, selected design material may need to

be reverified for accuracy and applicability. The need for reverification should be

reserved for those design documents for which the accuracy of the original

calculations/analyses is uncertain. Reverification also addresses the degree of as-built

variance from the current design requirements and should include techniques for physical

verification such as system walkdowns. Once the design requirements are established for

the facility, a rigorous program of change control and document control must be initiated

to maintain the accuracy of the information. Failure to install rigorous programs of

change control and document control following the establishment or verification of

design requirements could result in the need for expensive, repeated efforts to reverify the

information later.

Methods that have proven successful for reestablishing missing requirements information

include:

Performing reanalysis. This approach is basically equivalent to redesign. It

applies the design process to determine design requirements. Although it is the

most technically acceptable method for regenerating missing requirements, this

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