 The Nuclear Regulatory Commission has specific requirements for the design, construction and operation of nuclear power plants to ensure that those plants can withstand earthquakes that might be expected in their area. Those regulations are based on the safe shutdown ground motion, which means the level of vibration safety related structures and equipment at a plant must endure during a seismic event and still function. That ground motion number varies from nuclear plant to nuclear plant based on the geology of the area, its seismic history and specific geotechnical information or the way engineers use geology to determine building requirements. Two events in 2011 only a few months apart highlighted the importance of the NRC's seismic regulations. In March 2011, a 9.0 magnitude earthquake off the coast of Japan caused a tsunami that disabled power supplies and cooling to several nuclear reactors at the Fukushima Daiichi Nuclear Station. Important safety structures and equipment were largely undamaged by the earthquake's ground motion, but flooding from the tsunami created major problems. In August 2011, a much smaller earthquake measuring 5.8 in magnitude occurred near Mineral Virginia close to the North Ana Nuclear Station. The plant exceeded some ground motion levels for which it was licensed and both North Ana units safely shut down. Detailed reviews and inspections by Dominion, the plant operator and the NRC confirmed there was no damage to safety equipment and both North Ana units were given permission to restart in November 2011. These two events provided valuable insight into how nuclear plants might withstand an actual earthquake and provided important information the NRC is using to improve its regulations and ensure the safety of U.S. nuclear plants. That gave us some understanding and confidence that the seismic margin, which is the level of capacity that a plant has beyond to the level of shaking that it experienced, is actually truly what we had been calculating. NRC seismologists have worked closely with NRC inspectors, licensed reviewers and others within the agency to apply the real-world lessons of Fukushima and North Ana to all other U.S. nuclear plants. That effort included NRC teams walking through the nuclear plants to look at important structures, systems and components and determine if there were any potential issues with how that plant might fare during an earthquake. In addition to information from the two actual earthquakes, the NRC continually works to make sure potential earthquake hazard information for all nuclear plants is as up-to-date and as accurate as possible. A major effort in that area began several years before the earthquakes in Japan and Virginia. That analysis confirmed that the country's nuclear plants remain safe and although the overall seismic risk is low, some plant estimates may have increased and are getting further NRC attention. Over the next few years we'll take a look at that hazard and do risk assessments also for the plant to determine if upgrades are needed or determine if further equipment needs to be upgraded or additional work needs to be done. So it's an ongoing effort, very extensive, very thorough and we're confident that we will determine that the plants continue to be safely operated. Because I do work here and I see the way that the performance criteria and the performance levels and the care that's given into our assessment that we're doing for these plants. And I think that my own level of confidence or comfort is definitely getting stronger as we're going through this recommendation 2.1 process where we're doing a very thorough job of putting numbers and risk numbers and new hazard numbers against these plants. Fortunately the seismic risk for most U.S. nuclear plants is very low and all plants are designed to withstand the ground motions expected in that area. However the NRC continues to examine information from actual earthquakes and review improved predictive models as well as inspect current plants, those under construction and those still in the design phase to be certain that people living near U.S. nuclear plants are protected.