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As defined in the program criteria, DISs should include the following information:
System description (including system interface information)
System operability requirements
System-level design requirements
Component-level design requirements
Design basis
Related design topical information
The DIS Format and Content Guide should define the level of detail of the technical content. It should
also define the general format and approach and should include guidance on technical writing and
style. Further guidance on DIS format and content is provided in Appendix IID.
Design Information Summaries should be written for a variety of users and experience levels. The DR
action plan should have identified the end users and end uses. Users will range from operations,
maintenance, testing, procurement, training, and QA personnel to design engineers. Design
information Summaries should be tailored to meet individual facility needs and constraints, making use
of existing programs and results. The level of detail should reflect program objectives and end uses.
To avoid reliance on current experience levels, DISs should be written for a hypothetical 3year
engineer. Such an engineer (or scientist) would have a general facility background, would know the
facility layout, and would know the general actions the system has to perform. This approach defines
an appropriate DIS content without getting into unnecessary details and explanations.
For DISs, a mixed approach is preferable to comprehensive or index approaches. The index
approach involves minimal text and extensive lists of references. This approach collates the design
information and provides a road map for a prospective user. The comprehensive approach involves
text material and copies of actual design documents such as procurement specifications, with a
minimum of references. The mixed approach is a balance between the index approach and the
comprehensive approach and provides the most useful and cost-effective DISs.
The mixed approach makes significant use of text material but references key supporting design
process documents. The text includes system descriptions and drawings, operability requirements,
system functions, component information, system and component design basis, regulatory
requirements, and DOE commitments. Referenced documents include calculations and analyses,
codes and standards, design practices, procurement specifications, and TSRs. It is unnecessary to
duplicate the content of other self-contained documents such as American Society of Mechanical
Engineers (ASME) code stress reports, equipment qualification data packages, vendor manuals,
operations and maintenance procedures, industry codes and standards, specifications, generic
regulatory requirements, and calculations.
References should be to design process documents (e.g., calculations, analyses) rather than facility
operating and maintenance documents or secondary facility configuration documentation. The original
information should be referenced whenever possible to avoid translation and interpretation errors.
A DIS Layout Guide, separate from the DIS Format and Content Guide, should be prepared to ensure
consistency in document layout and word processing conventions. Such a guide would contain
instructions on margins, spacing, numbering, and other issues of particular benefit to DIS word
processors and editors. The DIS Layout Guide should clearly distinguish between design requirements

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