Document: NUREG-0800
Document ID: 21b37b7c-b45c-4247-b4a5-c2f28df75be4
Document Type: srp
Title: INSTRUMENTATION AND CONTROLS (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070663.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.5
CFR Part: 
CFR Title: 

Content:
59-like" process that is specified in the design certification rule for the design. The staff bases its safety determinations on the design processes specified in SSAR. Therefore, for the evolutionary designs, the staff designated selected information in Tier 2 Chapter 7 that, if considered for a change, requires NRC approval prior to implementation. This information is known as Tier 2* information (see Appendix A for instructions on designating information in SSAR as Tier 2*). Similar information should be considered on a design-specific basis for all standard designs. The areas in the design that are designated as Tier 2* shall be designated in the SER with the following statement: "Any changes to this commitment would require NRC approval prior to implementation." The rational for the selection of these items should be stated in the SER. 14.3.5-9 DRAFT Rev. 0 - April 1996 These items should typically be restricted to rapidly changing technology where it is inappropriate to "lock in" a design process for the lifetime of the design certification by placing the material in Tier 1, but would also be inappropriate to allow COL applicants or licensees to make unreviewed changes. Therefore, the items listed in Tier 2 should generally be the supporting material for the DAC. The staff may allow some of the Tier 2* designation to expire after first full power operation of the facility, when the detailed design is complete and the facility performance characteristics are known from the initial test program. The NRC bears the final responsibility for designating which material in DCD Tier 2 is Tier 2*, and whether the designation will expire. III. REVIEW PROCEDURES 1. Follow the general procedures for review of Tier 1 contained in the Review Procedures section of SRP Section 14.3. Ensure that the DCD is consistent with Appendix A to this SRP section. Review responsibilities may be consistent with those in Appendix B. 2. Ensure that all Tier 1 information is consistent with