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:
ected areas of the design. e. A discussion of the Tier 1 commitments for the Initial Test Program and Design Reliability Assurance Program. The design descriptions may utilize a system-based structure which is different than the structure of Tier 2. Consequently, developing the design description entries for any one system must be based on the multiple DCD Tier 2 chapters having technical information related to that system. This approach should be discussed in Section 14.3, describing how the many design aspects of the SSCs in Tier 1 were derived. The emphasis in DCD Tier 2 Section 14.3 should be on discussing the level of detail in Tier 1. Acceptable approaches for selection of the top-level requirements for Tier 1 may be based on the safety significance of SSCs, their importance in various safety analyses, and their functions for defense-in-depth considerations. At a minimum, the section should include a discussion of how the following items were addressed in the selection of the Tier 1 material: a. Selection of design information from the various chapters of Tier 2. b. Features or functions necessary to satisfy the NRC's regulations in 10 CFR Parts 20, 50, 52, 73, or 100. c. Treatment of safety-related SSCs. d. Treatment of important features and functions identified in the NRC's SRP. e. Important insights or assumptions from the probabilistic risk assessment f. Treatment of severe accident design features. DRAFT Rev. 0 - April 1996 14.3-26 g. Incorporation of operating experience. This includes USIs, GSIs, and TMI items; NRC generic correspondence such as bulletins, circulars, and generic letters; and relevant industry operating experience. h. Provisions in the facility technical specifications and their bases. i. Provisions in the test descriptions for the pre-operational and power ascension test programs contained in Section 14.2 of Tier 2. The staff is particularly interested in ensuring that the assumptions and insights from key safety and integrated plant