Light-Water Reactors Sub-Arena

New light-water reactors (LWRs) comprise one of four sub-arenas that the staff of the U.S. Nuclear Regulatory Commission (NRC) identified in considering which areas of the reactor safety arena to target for greater use of risk information. This page summarizes the following aspects of this sub-arena with expanding menus:

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List of Risk-Informed and Performance-Based Activities

This list shows the ongoing licensing initiatives, projects, and activities that the staff of the U.S. Nuclear Regulatory Commission (NRC) has targeted for greater use of risk information in the Light-Water Reactors Sub-Arena within the Reactor Safety Arena:

Evaluate and Develop Risk-Informed Regulatory ROP Guidance for New Reactors

double arrow head (chevron) pointing downward FY 2022

The NRC staff completed the update of baseline inspection procedures to incorporate unique sample requirements, to applicable procedures, that considers the risk profile of the AP1000 Units. In SECY-20-0050, the staff proposed the current inspection sample sizes (minimum, nominal, and maximum) for Units 1 and 2 as well as the proposed sample sizes for Units 3 and 4, and revised sample sizes for those Baseline Inspection Procedures (BIPs) for which the Vogtle Electric Generating Plant (VEGP) will be treated as a four-unit site. The staff also proposed the approach to inspecting the regulatory treatment of non-safety system systems (RTNSS) of structures and components within the Reactor Oversight Process.

For common sitewide program BIPs, the staff identified that many BIPs are not dependent on system design or numbers of components. If the applicable organizational structure is common to the four units (e.g., site security is the same for all units), the staff intends to treat the facility as a single four-unit site. For these BIPs, the staff determined that the current sample range was sufficient with the expectation that inspections will be performed at the maximum sample range and resource estimate at the VEGP.

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Page Last Reviewed/Updated Tuesday, August 08, 2023