Document: NRC Regulatory Guide
Document ID: d35b20dd-1c15-4bc0-ab12-86d3766156f4
Document Type: regulatory_guide
Title: Withdrawing RG 1.41 because its guidance has been incorporated into RG 1.32, Revision 4
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1427/ML14272A332.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.41
CFR Part: 
CFR Title: 

Content:
t, § 50.63), loss of large areas of the plant due to explosions or fire (§ 50.54 (hh)(2)), and Order EA-12-049. 2. What is the impact on internal and external stakeholders of not updating the RG for the known issues, in terms of anticipated numbers of licensing and inspection activities over the next several years? Currently RG 1.41 recommends testing Class 1E electrical systems to verify that they are not cross-connected such that a single event could cause faults in multiple trains and that they are not cross-dependent such that a single event could cause the loss of required support systems for multiple trains. The RG does not address non Class 1E electrical systems that may be required and used by station emergency procedures to respond to loss of all alternating current power (Station Blackout, § 50.63), loss of large areas of the plant due to explosions or fire (§ 50.54 (hh)(2)), and Order EA-12-049. Revising the RG to address some or all of these additional requirements would result in additional testing for new plant construction (currently 4 plants at two sites) or existing plant significant modifications to ensure the installation for non-Class 1E electrical systems met the design requirements and that unforeseen cross-connections and cross- dependencies do not exist. This additional testing is outside the normal scope of NRC inspection activities. The additional requirements in response to Fukushima lessons learned may affect the NRC inspection scope. Not revising the RG will not change current licensing or inspection activities for the internal or external stakeholders. Additional requirements in response to Fukushima lessons learned may affect both licensing and inspection. Not revising the RG could subject the NRC to questioning from the public during future licensing activities, as to the adequacy of NRC recommendations for testing of design features that the NRC requires by regulation, to ensure the station can implement its emergency and beyond