Document: NRC Regulatory Guide
Document ID: 2459a562-8984-421c-8058-d096dbb9617c
Document Type: regulatory_guide
Title: Guidelines for Categorizing Structures, Systems, and Components in Nuclear Power Plants According to Their Safety Significance
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0314/ML031430373.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.201
CFR Part: 
CFR Title: 

Content:
: D. Diec 301-415-2834 DRAFT REGULATORY GUIDE DG-1121 GUIDELINES FOR CATEGORIZING STRUCTURES, SYSTEMS, AND COMPONENTS IN NUCLEAR POWER PLANTS ACCORDING TO THEIR SAFETY SIGNIFICANCE A. INTRODUCTION The U.S. Nuclear Regulatory Commission (NRC) has promulgated regulations to permit power reactor licensees and applicants for licenses to implement an alternative regulatory framework with respect to “special treatment,” where special treatment refers to those NRC requirements that provide increased assurance beyond normal industrial practices that structures, systems, and components (SSCs) perform their design basis functions. Under this framework, licensees who use a risk-informed process for categorizing SSCs according to their safety significance can remove SSCs of low safety significance from the scope of certain identified special treatment requirements. The genesis of this framework stems from Option 2 of SECY-98-300, “Options for Risk- Informed Revisions to 10 CFR Part 50 - Domestic Licensing of Production and Utilization Facilities,” dated December 23, 1998. In this SECY, the NRC staff recommended that risk-informed approaches to the application of special treatment requirements be developed to reduce unnecessary regulatory burden of SSCs of low safety significance by removing them from the scope of special treatment requirements. The Commission subsequently approved the NRC staff’s rulemaking plan and issuance of an Advanced Notice of Proposed Rulemaking (ANPR) as outlined in SECY-99-256, “Rulemaking Plan for Risk-Informing Special Treatment Requirements,” dated October 29, 1999. The ANPR was published in the Federal Register (65 FR 11488) on March 3, 2000. In the rulemaking plan, the NRC proposed to create a new section within Part 50, Section 50.69, to contain these alternative requirements. This guide conforms to a proposed amendment to 10 CFR 50.69 that was published in the Federal Register (68 FR 26511) on May 16, 2003. This draft regulatory