The Crystal River reactor went offline in September 2009 for refueling, OTSG replacement (once through steam generator), and 20% power up-rate outage.

The main cause of the gap, which further engineering analysis determined was a large delamination, was attributed to the scope and sequence of the tendon detensioning.

[4] The plant had originally been scheduled to restart in April 2011, but the project encountered a number of delays.

After several months of analyzing options, Duke Energy senior executives announced in February 2013 that the Crystal River Nuclear Plant would be permanently shut down.

The containment has 42-inch thick concrete walls, has a flat foundation mat and a shallow torispherical dome.

According to a Progress employee, "de-tensioning the tendons is a very expensive and time-consuming effort", so the number was further reduced to 65.

[12] In February 2013 Duke Energy announced that Crystal River would be permanently shut down and that they will recover $850 million in insurance claims.

[6] A Duke spokesperson stated, "The company sought input from numerous engineering experts — internally and externally — and used proven industry-accepted practices when determining how to replace the steam generators.

[10] The NRC defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of 10 miles (16 km), concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about 50 miles (80 km), concerned primarily with ingestion of food and liquid contaminated by radioactivity.

[13] The 2010 U.S. population within 10 miles (16 km) of Crystal River was 20,695, an increase of 50.9 percent in a decade, according to an analysis of U.S. Census data for msnbc.com.