Seven top Nuclear Regulatory Commission (NRC) experts have taken the brave rare step of publicly filing an independent finding warning that nearly every U.S. atomic reactor has a generic safety flaw that could spark a disaster.

The warning mocks the latest industry push to keep America’s remaining 99 nukes from being shut by popular demand, by their essential unprofitability, or, more seriously, by the kind of engineering collapse against which the NRC experts are now warning.

According to Reuters, the NRC engineers worry the flaw leaves U.S. reactors “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.”