Update on implementation of severe accident countermeasures in the United States

The progress of the nuclear industry within the United States (U.S.) in responding to regulatory changes following the events at Fukushima Dai-ichi is significant and rapidly evolving. The U.S. Nuclear Regulatory Commission (USNRC) has issued questions related to submitted utility approaches in satisfying Order EA-12-049. In addition to responding to these questions, the U.S. nuclear industry has continued to perform plant modifications, procure equipment, establish national response centers, establish new plant procedures, and address other Regulatory Orders and Directives. In addition to these required activities, the U.S. nuclear industry has also identified means to utilize these new capabilities to provide other benefits. (author)