Document: NUREG-0800
Document ID: 9cfc38bf-7808-446e-a43d-4ca9ff55df2a
Document Type: srp
Title: AC POWER SYSTEMS (ONSITE)
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1007/ML100740289.pdf
Revision Date: 2023-06
Chapter: 8
Section ID: 8.3.1
CFR Part: 
CFR Title: 

Content:
made in the design of the onsite power systems for grounding, surge protection, and lightning protection. The reviewer evaluates onsite power system grounding, ground fault current limiting features, lightning/transient surge protection features, and measures for isolation of instrumentation grounding systems. RG 1.204 and IEEE Stds. 665, 666, 1050, and C62.23, which the RG endorses, provide acceptable guidelines for the design, installation, and performance of lightning protection systems. Guidance with respect to grounding system design and analysis criteria for COL applications that are not based on certified ALWR designs is provided in RG 1.206, Section C.I.8.3.1, and for those COL applications based on certified designs, in RG 1.206, Section C.III.1 Chapter 8. Detailed review of grounding and lightning protection for the generating station and offsite power system is provided in SRP Section 8.2. Variations in voltage, frequency and waveform (harmonic distortion) in the onsite power system and its components during any mode of plant operation should not degrade the performance of any safety system load below an acceptable level. IEEE Std. 308 and other industry standards (Reference 60), and RG 1.206, Section C.I.8.3.1, for COL applications that are not based on certified ALWR designs, provide guidance on system power quality limits and the effects of degraded voltage on instrumentation and protection systems. RG 1.206, Section C.III.1, Chapter 8, provides similar guidance for COL applications that are based on certified ALWR designs. In assessing the adequacy of the electrical ties between the onsite and offsite power systems, and the capability of the preferred power circuits to deliver power to the safety-related buses, both primary and secondary backup protective relaying schemes and their coordination, relay settings, and assigned control power supplies are reviewed. The reviewer should ensure that, in the event of an electrical fault, between the preferred