Interim Staff Guidance: Content of Risk Assessment and Severe Accident Information in Light-Water Power Reactor Construction Permit Applications
Published Date: 1/29/2026
Notice
Summary
The Nuclear Regulatory Commission (NRC) just released new guidance to help companies applying for construction permits for light-water nuclear reactors. This guidance explains exactly what risk and accident info they need to include, making the review process clearer and smoother. It kicks in on March 2, 2026, and mainly affects future applicants aiming to build these reactors, helping save time and avoid costly delays.
Analyzed Economic Effects
2 provisions identified: 2 benefits, 0 costs, 0 mixed.
Clarifies Risk/Severe-Accident Filings
The NRC issued Interim Staff Guidance DRA-ISG-2026-01 that explains exactly what risk assessment and severe-accident information must be included in the Preliminary Safety Analysis Report (PSAR) for a light-water reactor (LWR) construction permit (CP) application. The guidance applies to the review of all CP applications for LWRs (but not to non-LWR applications) and is effective March 2, 2026; the NRC noted one prospective applicant is interested in submitting a CP application in the next few years.
No Backfit or New Burdens on Existing Licenses
The NRC states that issuing this ISG does not constitute backfitting under 10 CFR 50.109, does not constitute forward fitting as described in Management Directive 8.4, and would not affect the issue finality of approvals under 10 CFR part 52. The guidance does not apply to current licensees or to existing or requested approvals under 10 CFR part 52.
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