Document: NRC Regulatory Guide
Document ID: db0c5d18-2d27-4720-8935-40b402e52f9a
Document Type: regulatory_guide
Title: Guidance for a Technology-Inclusive, Risk-Informed, and Performance-Based Methodology to Inform the Licensing Basis and Content of Applications for Licenses, Certifications, and Approvals for Non-Light Water Reactors + HISTORY - HISTORY 05/2019 – Issued DG-1353 , Proposed Revision 0
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1831/ML18312A242.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.233
CFR Part: 
CFR Title: 

Content:
ose to arrange the information in a safety analysis report in a different format. The general guidance on the methodology to determine the appropriate content and level of detail for safety functions, SSCs, and programmatic controls remains valid no matter how the information is organized within a safety analysis report. NEI 18-04 describes the iterative nature of the design process and how the application reflects changes or additional information gathered as the design evolves through conceptual phases; incorporates various analyses and assessments; and is adapted due to regulatory, business, and policy considerations. Although the staff encourages pre-application discussions with developers, the reactor developer will need to have made design decisions appropriate for the specific license, certification, or approval before submitting an application. Similar to the processes described in NEI 18-04, the construction of a safety analysis report begins with documenting the basic reactor characteristics, such as non-LWR technology, power level, selection of the materials for the reactor, moderator, coolant, neutron energy spectrum, thermodynamic cycle, parameters of the cycle and energy balance; evaluation of options such as fuel type, indirect versus direct cycle, and passive versus active safety systems; working fluids for secondary cycles; selection of design codes for major SSCs; operations and maintenance philosophy; and other high-level design decisions driven by the top-level requirements and results of the design trade studies. The foundational material for a safety analysis report also includes a comprehensive set of plant-level and system-level functional requirements that have been identified through processes such as those described in NEI 18-04 as serving a role in the prevention or mitigation of events. Many of the basic reactor characteristics have traditionally been described in Chapters 4, 5, and 6 of safety analysis reports. These chapters address