Document: NUREG-0800
Document ID: f03d2c71-27a1-41fd-9362-1e62c6142e13
Document Type: srp
Title: Containment Systems and Severe Accidents (Tier 1)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070653.pdf
Revision Date: 2023-06
Chapter: 14
Section ID: 14.3.11
CFR Part: 
CFR Title: 

Content:
e associated with detailed structural and equipment design; design and analysis methodology for fuel and control rods; and 14.3-13 DRAFT Rev. 0 - April 1996 supporting material for the Instrumentation & Controls, Control Room, and Piping design acceptance criteria (DAC). The requirement for prior NRC approval for many of these Tier 2* areas may expire at first full power for the facility. The staff may determine that selected material in the SSAR, if considered for a change by an applicant or licensee that references the certified design, would require NRC approval prior to implementation of the change. This information is designated as Tier 2* information. Tier 2* is generally information that is not appropriate for treatment in Tier 1 because it requires a significant amount of information to describe and is subject to change. Tier 2* is generally considered for areas associated with detailed structural and equipment design; design and analysis methodology for fuel and control rods; and supporting material for the DAC areas of the design. Some designations of Tier 2* material may expire at first full power operation, when the detailed design of the facility and its performance characteristics are known, and tested through the initial test program. The NRC bears the final responsibility for designating which material in the SSAR is Tier 2*. All cases where the staff believes that Tier 2* applies are to be reviewed and approved by the cognizant Division Director. The staff's rationale for the Tier 2* information in each area and the basis for the determination that a change would require prior NRC approval, must be documented in the FSER. The DCD should designate clearly (bracketed and italicized) the information that is determined to be Tier 2*. Use of other markers such as asterisks and bold type may also be appropriate. A table should be provided in the DCD listing the areas of the DCD that contain Tier 2* information. A statement should be included with the