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DOESTD107393
Multi-Tiered Design Process. The design process produces both design requirements and the
associated design basis. Changes to design requirements need to be supported by the design basis.
The design process identifies, documents, categorizes, and sorts by SSC every new facility design
requirement, as well as changes or modifications to existing design requirements. The design process
also identifies and documents the design basis of every new facility design requirement, in addition to
changes or modifications to existing design requirements.
The design process is called upon whenever a change to the facility design requirement is
contemplated. Permanent and temporary facility physical changes need engineering design if they
involve potential changes to design requirements. Changes to final designs, field changes, facility
physical changes, and nonconforming items dispositioned use-as-is or repair should be evaluated, and
subject to design control measures commensurate with the original design. Requests for, engineering
design may be initiated from within the design organization, and also from non-design organizations,
such as operations, maintenance, and technical support.
Design controls may vary based on the complexity and significance of the design change. For
example, some commercial nuclear facilities employ a three-tiered design process. Once the design
process is initiated, a scope assessment is conducted to determine which tier the design change will
take. This assessment reviews the technical complexity, the magnitude of the change, and the
potential impact on previous commitments, including the authorization basis. Based on the scope
assessment, the engineering management decides which of the three tiers the design task will pursue.
These three tiers might be designated: Field Change Notices (for simple drawing changes to reflect as-
built conditions); Minor Modification Packages (for minor facility changes such as component re-
designs, with minor systems impact or systems interaction, and minor safety significance); and Design
Change Packages (for other facility changes). Within DOE, an important distinction is between those
changes managed as projects under DOE 4700.1, and those not managed as projects. The facility
may also establish separate design control provisions to accommodate those changes to documents
only, without any associated physical changes.
The specific design control measures to ensure that the design process is correctly implemented may
vary depending on which tier is appropriate for a design change. However, regardless of the level of
design control applied, the design process needs to produce both new/revised design requirements and
associated design basis. The design process is the same at the different levels. Without proper
controls, designs performed on the lower tiers often do not produce the necessary design basis and
design outputs. The design authority needs to carefully control and monitor each design tier to ensure
the design inputs, design constraints, design analysis and calculations, and design requirements are
identified, accurate, complete, and documented.
II-A-3


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