Pennlive.com article reports, Three Mile Island reactor unit 1 returned to service after "...personnel replaced the relay, installed additional monitoring capabilities and tested the pump prior to restarting it." The present writer ventures query, whether additional monitoring capabilities result of exploited vulnerability detected and patched? It's a fair question! The article continues, "... second time TMI has shut down in the past month. The first incident was between Aug. 22 and Sept. 6. Officials at the Nuclear Regulatory Commission have said that so far the two incidents appear to be unrelated. " Readers should find repeated shutdowns disquieting phenomena! A partial reactor meltdown in Unit 2 in 1979 at Three Mile Island remains nation’s worst nuclear accident. Could it be Stuxnet?