Document: NRC Regulatory Guide
Document ID: c7a40fcc-fc9d-4eb2-ad86-f9f5b0f04c82
Document Type: regulatory_guide
Title: Plant-Specific, Risk-Informed Decisionmaking:  Technical Specifications (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1920/ML19206A489.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.177
CFR Part: 
CFR Title: 

Content:
chieve high levels of safety. The information in this RG is generally consistent with the principles in the below IAEA documents: • IAEA Safety Guide SSG-3, “Development and Application of Level 1 Probabilistic Safety Assessment for Nuclear Power Plants Specific Safety Guide” (Ref. 17) • IAEA Safety Guide SSG-4, “Development and Application of Level 2 Probabilistic Safety Assessment for Nuclear Power Plants Specific Safety Guide” (Ref. 18) • IAEA Safety Standards SSR-2/1, Revision 1, “Safety of Nuclear Power Plants: Design” (Ref. 19) These safety guides provide recommendations for performing or managing a probabilistic safety assessment for nuclear power plants and using the assessment to support safe design and operation. This RG discusses some of the same principles with respect to changes to a plant’s licensing basis. DG-1287, Page 7 C. STAFF REGULATORY GUIDANCE This section provides detailed descriptions of the methods, approaches, or data that the staff considers acceptable for meeting the requirements of the applicable regulations cited in the Introduction of this guide. RG 1.174 identifies five key principles that all risk-informed applications are expected to meet and that risk-informed changes to plant TS should explicitly address. The five key principles listed in RG 1.174 are as follows: • Principle 1: The proposed licensing basis change meets the current regulations unless it is explicitly related to a requested exemption (i.e., a specific exemption under 10 CFR 50.12). • Principle 2: The proposed licensing basis change is consistent with the defense-in-depth philosophy. • Principle 3: The proposed licensing basis change maintains sufficient safety margins. • Principle 4: When proposed licensing basis changes result in an increase in risk, the increases should be small and consistent with the intent of the Commission’s policy statement on safety goals for the operations of nuclear power plants. • Principle 5: The impact of