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:
design that are verified by ITAAC. The structure consists of three parts: the Tier 1 Design Description, the corresponding DAC, and the Tier 2 supporting information in the DCD Tier 2 for the DAC. The Design Description for each DAC should describe its scope and applicability to the SSCs of the design. Amplifying information on this Tier 1 information should be contained in DCD Tier 2 Section 14.3. Alternatively, applicants may choose to address all design issues appropriately in the SSCs to which they apply. For the two areas of rapidly changing technology, control room and remote shutdown system design (human factors), and digital computer-based instrumentation and controls design, the Design Descriptions and DAC delineate the process and requirements that a COL applicant or licensee must implement to develop the design information required in each area. Acceptance criteria are specified in Tier 1 for the development process at DRAFT Rev. 0 - April 1996 14.3-28 various stages of detailed design and subsequent construction and testing. The COL applicant or licensee is required to develop the procedures and test programs necessary to demonstrate that the DAC requirements are met at each stage. Similar to ITAAC, the COL applicant or licensee will certify to the NRC that the design through that phase is in compliance with the certified design. The NRC will review, audit, and inspect the work to confirm that the COL applicant or licensee has adequately implemented the commitments of the DAC at these phases. The process may be referred to as a "phased" DAC because it consists of a set of sequential steps or phases that require successful completion. A COL applicant or licensee is not required to certify that each phase is completed sequentially. However, if the staff determines that a DAC was not successfully met, the design process may be required to be repeated to meet the DAC, possibly requiring a change to the as-built system design. 2. Initial Test Program (ITP)