The U.S. Nuclear Regulatory Commission (NRC) has issued a new version, Revision 4, of Regulatory Guide (RG) 1.32 and introduced a new guide, RG 1.238, concerning the standards for power systems in nuclear power plants. RG 1.32 details how to design, operate, and test electric power systems in nuclear plants, while RG 1.238 focuses on protecting specific types of power systems and equipment. These guides provide methods approved by the NRC for meeting regulations, and they incorporate updated standards from the Institute of Electrical and Electronics Engineers (IEEE). The issuance of these guides does not enforce any new regulatory requirements on licensees.
Simple Explanation
The rules for how power systems work in nuclear power plants just got an update, with new guides to help keep everything safe and running well. These new instructions tell people how to manage the power, but they don't make anyone change what they're doing right now.