Preparation and Issuance of Design Informations Summaries

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regeneration completes the reconstitution of the existing design requirements. Where certain design

requirements are not regenerated, the missing design requirements should be noted for listing in the

DIS.

3.5.2 REGENERATION OF DESIGN BASIS

The technical management review will also identify missing design basis that are candidates for

regeneration. Similar to the review of missing design requirements, facilities should consider the

missing design basis for a given system or topic, determine which are critical, and prioritize the

associated regeneration activities. Regeneration is not needed for all missing design basis. The DR

program should establish the priority and the time frame for regeneration activities. Highest priority

should be given to regeneration of the design basis for SSCs that support the accident analyses or

TSRs. Further prioritization may be based on the following factors: associated design requirement

type (e.g., safety, environmental), associated SSC importance, modification history, future plans for

modification, and design pedigree.

The basic methods of regeneration (reanalysis, documented experience, reenactment, and testing) of

design requirements apply also to the design basis. After regeneration of design requirements, a

management review should be conducted to approve the completed set of design basis information.

3.6 PREPARATION AND ISSUANCE OF DESIGN INFORMATION SUMMARIES

The DR program results in complete, verified, and validated DISs. The specific scope of system and

topical DISs to be prepared is defined by the DR program plan.

3.6.1 PILOT DESIGN INFORMATION SUMMARY PROGRAM

A pilot DIS program should be performed before proceeding with the full-scale DIS program. This

allows for testing the adequacy of program procedures to ensure the development of consistent

products and the satisfaction of program goals and objectives before the start of full-scale DIS

production and further expenditure of resources. This pilot effort should focus on DIS preparation and

review, including DIS format, contents, and layout.

The pilot DIS program should include both system-level DISs and a topical DIS. One of the system

DISs should be for a safety system. The DISs prepared during the pilot program may be used as a

starting point or as-is for the associated Revision 0 DISs prepared in the full-scale DIS program.

The DIS pilot program may begin before completion of the retrieval of available design basis

information (i.e., before completion of the comprehensive search) and before completion of the design

requirements regeneration. For the pilot program, the completeness of design information is not as

important as the process and its effectiveness. At the conclusion of the pilot program, lessons learned

should be identified and incorporated into the DR action plan and procedures.

3.6.2 DESIGN INFORMATION SUMMARY FORMAT AND CONTENT GUIDE

The contents, format, and style of the DISs will have a great impact on their usefulness and, therefore,

their cost-effectiveness. To ensure that the DISs meet their intent, DIS preparation guidance should

be provided for writers and reviewers. The DIS Format and Content Guide should specify DIS

contents and explain what is to be included in each section.

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