CORRECTED-U.S. NRC engineers urge fix for nuclear power stations

The petition, filed under a standard NRC process, urges the agency to respond by March 21.
The engineers are concerned that a design flaw in nearly all U.S. nuclear facilities leaves them vulnerable to so-called open phase events in which an unbalanced voltage, such as an electrical short, could cause motors to burn out and reduce the ability of a reactor's emergency cooling system to function. If the motors are burned out, backup electricity systems would be of little help, the petition said.
 

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