This document supplements the draft supplemental environmental impact statement (DSEIS) which had been prepared in response to an application submitted by NextEra Energy Seabrook, LLC (NextEra) to renew the operating license for Seabrook Station (Seabrook) for an additional 20 years. This supplement incorporates new information that the U.S. Nuclear Regulatory Commission (NRC) staff has obtained since the publication of the DSEIS in August 2011.