Document: NRC Regulatory Guide
Document ID: 1731a882-b0c5-418d-b65e-55646c26be5c
Document Type: regulatory_guide
Title: 03/2007
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0703/ML070380553.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.9
CFR Part: 
CFR Title: 

Content:
ds and failures. The preoperational and periodic testing provisions set forth in this guide provide a basis for taking the corrective actions needed to maintain high inservice reliability of installed emergency diesel generators. The database developed will assist ongoing performance monitoring for all emergency diesel generators after installation and during service. Clause 2 of IEEE Std 387-1995 references several industry codes and standards. If a referenced standard has been separately incorporated into the NRC’s regulations, licensees and applicants must comply with that standard as set forth in the regulations. Similarly, if the NRC staff has endorsed a referenced standard in a regulatory guide, that standard constitutes an acceptable method of meeting a regulatory requirement as described in the given regulatory guide. Conversely, if a referenced standard has been neither incorporated into the NRC’s regulations nor endorsed in a regulatory guide, licensees and applicants may consider and use the information in the referenced standard, if appropriately justified, consistent with regulatory practice. Rev. 4 of RG 1.9, Page 5 C. REGULATORY POSITION Conformance with the guidelines in IEEE Std 387-1995 (Ref. 3) constitutes an acceptable method for satisfying the Commission’s regulations with respect to the design, qualification, and periodic testing of diesel generators used as onsite electric power systems for nuclear power plants, subject to the following exceptions. 1. Design Considerations The following regulatory positions supplement the guidelines of IEEE Std 387-1995, as they relate to design considerations: 1.1 Clause 1.1.1, “Inclusions,” of IEEE Std 387-1995 should be supplemented to include diesel generator auto controls, manual controls, and diesel generator output breaker. 1.2 When the characteristics of the required emergency diesel generator loads are not accurately known, such as during an early stage of design, each emergency diesel