from the same article:
The process has not been without frightening glitches. For instance, at the Peach Bottom, Pa., nuclear power plant, an entire control room went dead when a technician inadvertently connected the test systems to a non-compliant computer system. As a result, staff was thrown back to using analog gauges and calculating reactor conditions by hand based on those read-outs. If human error hadn't interfered, the system would have worked. And, despite the problems, the plant did not pose any threat to the public - because engineers were still in control of the core, even if they had to use "antiquated" gauges.
Peach Bottom bears out the need for testing, since a plant that failed to identify potential problems and make repairs could unexpectedly find itself in the midst of a data blackout on January 1, 2000. The Nuclear Regulatory Commission and power industry, however, have gone to great lengths to identify potential problems well in advance. NRC auditors have surveyed a dozen nuclear power plants to provide the industry with specific information about the risks they face and what problems they should be looking for.
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