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:
s, 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, switchgear, etc.) from direct lightning strikes, incoming surges, internally generated surges, and ground potential rises. It also covers the protection of control and communication circuits and discusses the beneficial effects of shielding, grounding, and cable routing in the power plant buildings. In addition, the standard covers the protection of remote ancillary facilities, dealing primarily with protection from direct lighting strikes and the surges induced on underground cables. IEEE Std. 665-1995, IEEE Std. 666-2007, IEEE Std. 1050-2004, and IEEE Std. C62.23-2017 reference other IEEE standards that contain useful information but are not endorsed in this RG; these secondary references are listed in Appendix A for clarity. Two other useful secondary references are National Fire Protection Association (NFPA) Standard 780, “Standard for the Installation of Lightning Protection Systems," (Ref. 5) and Underwriters Laboratories (UL) Standard 96A, “Installation Requirements for Lightning Protection Systems,” (Ref. 6). While the NRC staff is not endorsing these two standards due to their exclusion of electric power generation facilities, staff notes that Annex B “Principles of Lightning Protection” and Annex D “Inspection and Maintenance of Lightning Protection Systems” in NFPA 780 provide useful information on testing and maintenance practices that licensees and applicants may wish to reference in developing their own testing and maintenance practices. Consideration of International Standards The International Atomic Energy Agency (IAEA) works with member states and other partners to promote the safe, secure, and peaceful use of nuclear technologies. The IAEA develops Safety Requirements and Safety Guides for protecting people and the environment from