Document: NRC Regulatory Guide
Document ID: fe0fff83-b171-47c6-a3a7-46faf8de3252
Document Type: regulatory_guide
Title: Criteria for The Protection of Safety-Related
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2415/ML24158A041.pdf
Revision Date: 2024-08
Chapter: 
Section ID: RG-1.238
CFR Part: 
CFR Title: 

Content:
FR 50.36, “Technical Specifications”; 10 CFR 50.55a; and 10 CFR Part 50, Appendices A and B. Related Guidance • Branch Technical Position 8-6, “Adequacy of Station Electric Distribution System Voltages,” issued March 2007 (Ref. 7), provides guidance on the design of undervoltage protection systems for Class 1E equipment. • Bulletin (BL) 2012-01, “Design Vulnerability in Electric Power System,” dated July 27, 2012 (Ref. 8), discusses open phase conditions and protection schemes for electric power systems. BL- 2012-01 was subsequently closed on March 6, 2023 (Ref. 9). • Information Notice (IN) 1995-05, “Undervoltage Protection Relay Settings Out of Tolerance Due to Test Equipment Harmonics,” dated January 20, 1995 (Ref. 10), discusses operating experience on test equipment harmonics that could result in undervoltage relay actuation settings that are out of tolerance. • IN 2012-03, “Design Vulnerability in Electric Power System,” dated March 1, 2012 (Ref. 11), provides more information on open phase conditions and protection schemes for electric power systems. • NUREG-0800, “Standard Review Plan for the Review of Safety Analysis Reports for Nuclear Power Plants: LWR Edition” (Ref. 12), provides guidance to the NRC staff on performing safety reviews under 10 CFR Part 50 and 10 CFR Part 52. • Regulatory Issue Summary (RIS) 2006-017, “NRC Staff Position on the Requirements of 10 CFR 50.36, ‘Technical Specifications,’ regarding Limiting Safety System Settings during Periodic Testing and Calibration of Instrument Channels,” dated August 24, 2006 (Ref. 13), provides regulatory clarification on NRC staff positions about operability determinations for instrument channels based on a plant’s technical specifications. In particular, the RIS clarifies staff positions about the appropriate establishment of as-found and as-left acceptance tolerances. • RIS 2011-12, “Adequacy of Station Electric Distribution System Voltages,” dated