Document: NRC Regulatory Guide
Document ID: 038ef757-4de1-42af-8663-ffdbf7789d63
Document Type: regulatory_guide
Title: Standard Format and Content of Safety Analysis Reports for Nuclear Power Plants (Rev. 3)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2523/ML25234A141.pdf
Revision Date: 2026-02
Chapter: 
Section ID: RG-1.70
CFR Part: 
CFR Title: 

Content:
SECY- 25-0052 address regulatory and guidance gaps associated with microreactors, such as manufacturing and testing of multiple reactors in factories, transportation, fueling, spent fuel storage, and decommissioning. Rulemaking, including the revision or successor to RG 1.70, will be required to revise or develop new guidance to fully address all technical and processes items for applications submitted under Part 50, 52, and 53, either inclusively into one guidance document, or individually for each Part. It is anticipated that the guidance revision/development should follow the completion of said rulemaking, and for the review of applications such as the Clich River CP be completed, so the staff may apply insights from new regulations, lessons learned, and efficiency initiatives. 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? RG 1.70 was used and referenced in the Clinch River CP application. It is anticipated that RG 1.70, in conjunction with RG 1.206, NUREG 0800, and DNRL-ISG-2022-01, maybe also be used and referenced in applications in the near future, until new, more encompassing, guidance is developed. With significant changes happening in the current regulatory environment, including among other things, the above-mentioned rulemaking, ADAVCE Act, and Executive Orders, not updating RG 1.70 at this time is anticipated to have a minimal impact on internal and external stakeholders. Not updating RG 1.70 at this time is advised. 3. What is an estimate of the level of effort needed to address identified issues in terms of full-time equivalent (FTE) and contractor resources? NRC staff requires approximately 3 FTE to conduct rulemaking to incorporate RG 1.70 and updates into RG 1.206, or to develop new guidance. This is referred to as RG 1.70 successor rulemaking. No contract dollars are anticipated. This RG