"U.S. Orders New Safety Upgrades at Nuclear Plants"
"Washington -- U.S. regulators are directing 31 nuclear reactors similar in design to the Fukushima Daiichi plant in Japan, where an earthquake and tsunami caused a meltdown two years ago, to take additional steps to help contain radiation and other damage from any accident that is not quickly halted."
"The Nuclear Regulatory Commission directive on Thursday requires enhancements to systems for venting accumulated pressure from containment structures during an emergency. Vents must also be able to safely handle rising temperatures, hydrogen concentrations and radiation levels.
The changes also aim to ensure that plant personnel can continue to operate vents safely if a reactor core melts down, the agency said."Source: CNN, 06/07/2013