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The U.S. Nuclear Regulatory Commission is in the process of rescinding or revising guidance and policies posted on this webpage in accordance with Executive Order 14151 Ending Radical and Wasteful Government DEI Programs and Preferencing, and Executive Order 14168 Defending Women From Gender Ideology Extremism and Restoring Biological Truth to the Federal Government. In the interim, any previously issued diversity, equity, inclusion, or gender-related guidance on this webpage should be considered rescinded that is inconsistent with these Executive Orders.

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Large Light Water Reactors

Large Light Water Reactors (LWR) are reactors generating at least 700 MWe using ordinary water as coolant. This includes boiling water reactors (BWRs) and pressurized water reactors (PWRs), the most common types of operating reactors in the United States.

Currently, there are no large LWRs under review by NRC staff. Certified large LWR designs include the: ABWR, APR1400, AP1000, ESBWR, US-APWR and the U.S. EPR. These designs are associated with Early Site Permits and Combined License as described on the pages below.

Design Certifications

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Early Site Permits

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Combined License Applications

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Combined License Holders

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Withdrawn Construction Permit

Bellefonte Plant Unit 1 & 2

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Page Last Reviewed/Updated Wednesday, February 12, 2025