Document: NRC Regulatory Guide
Document ID: b3436475-0452-4460-897e-ef2d0023a709
Document Type: regulatory_guide
Title: Guidelines for Lightning Protection of Nuclear Power Plants (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2220/ML22208A232.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.204
CFR Part: 
CFR Title: 

Content:
I&C equipment to achieve a DG-1409, Page 5 suitable level of protection for personnel and equipment, as well as suitable noise immunity for signal- ground references in generating stations. IEEE Std. 1050-2004 is comprehensive, in that it covers both theoretical and practical aspects of grounding and noise minimization. Surge protection measures are vital for protection of the power plant, ancillary facilities that could impact safety, the switchyard, the electrical distribution system, safety-related I&C systems, and communication systems from both direct lightning strikes and the resulting power surges. SPDs should be applied at the entry and egress points for signal-, communication-, and power-line conductors. They should also be applied to any equipment that is thought to be vulnerable to high-energy surges. The selection of SPDs typically depends on the location of the devices and the size(s) needed to prevent the energy from a lightning strike from impinging a facility or piece of equipment. IEEE Std. C62.23-2017 describes surge protection application practices applicable to power generating stations. As such, this standard consolidates many electric utility industry practices, accepted theories, existing standards/guides, definitions, and technical references as they specifically pertain to surge protection. This standard also provides information on proper surge protection techniques and interference reduction practices for communication, control, and protection circuits. The standard covers the protection of transmission lines and switchyard equipment from direct lightning strikes (using overhead ground wires, tower footing resistance, counterpoise wires, and surge arresters on transmission lines); protection of distribution lines from direct lightning strikes, switching surges, and ferroresonance; and the selection of arrestors for distribution lines. The standard covers the protection of both indoor and outdoor equipment (including transformers, motors,