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
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CFR Title: 

Content:
ted format of the DCD Tier 2 and the SRP, thereby creating overlapping NRC review responsibilities. Also, some branches have review responsibilities for many systems. For example, consistent treatment of alarms, displays, and controls is the responsibility of the Human Factors Branch, and functionality of safety- significant motor operated valves (MOVs) is the responsibility of the Structural and Geosciences Branch. Therefore, the review process may be facilitated using task groups comprised of reviewers from several branches, as was done for the reviews of the evolutionary designs. All portions of Tier 1 information are reviewed by one or more branches. The primary review branches are responsible for the safety evaluations in their areas of responsibility and the secondary review branches provide input to the primary review branches. Additional secondary review branches are identified in the subsections to this SRP. SPSB: Reviews Tier 1 to ensure appropriate treatment of important insights and assumptions from the probabilistic risk assessment (PRA). Reviewers should use the guidance in the SRP sections related to the PRA issues to determine the appropriate top-level design features for inclusion in Tier 1 and provide inputs to the responsible review branches. Important integrated plant safety analyses from Tier 2 should be considered, such as analyses of fires, floods, severe accidents, and shutdown risk. Applicants should document in Tier 2 how important insights from the PRA analyses were incorporated 14.3-3 DRAFT Rev. 0 - April 1996 into the standard design, including Tier 1, technical specifications, initial test program, reliability assurance activities, emergency procedure guidelines, and combined license action items. Guidance for documentation of the PRA review in the design control document (DCD) is contained in Appendix A to this SRP. The PRA for site-specific portions of the design will be evaluated during the combined license review. PSGB: Reviews Tier