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:
comply with that standard as set forth in the regulation. If the secondary reference has been endorsed in a RG as an acceptable approach for meeting an NRC requirement, then the standard constitutes a method acceptable to the NRC staff for meeting that regulatory requirement as described in the specific RG. If the secondary reference has neither been incorporated by reference into NRC regulations nor endorsed in a RG, then the secondary reference is neither a legally binding requirement nor a “generic” NRC approved acceptable approach for meeting an NRC requirement. However, licensees and applicants may consider and use the information in the secondary reference, if appropriately justified, consistent with current regulatory practice, and consistent with applicable NRC requirements. DG-1354, Page 8 C. STAFF REGULATORY GUIDANCE The guidance in IEEE Std. 741-2022, including Annex A, “Illustration of concepts associated with degraded voltage protection,” provides an acceptable approach to the NRC staff for meeting the agency’s regulatory requirements for the protection of Class 1E power systems and equipment, with the exceptions, additions, and clarifications listed in this section. 1. This RG does not endorse Section 2, “Normative References,” of IEEE 741-2022. The following RGs contain additional information. • RG 1.32, which endorses IEEE Std. 308, with clarifications • RG 1.63, which endorses IEEE Std. 317, with clarifications • RG 1.30, which endorses IEEE Std. 336, with clarifications • RG 1.118, which endorses IEEE Std. 338, with clarifications • RG 1.75, which endorses IEEE Std. 384, with clarifications • RG 1.180, which endorses IEEE Std. 1050 2. Supplement Section 5.1.2c with the following: RG 1.105 should be used for guidance on establishing setpoints for safety-related instrumentation to protect plant safety and analytical limits, and on maintaining instrument channels implementing these setpoints to ensure they are functioning as