Will Americans experience, first hand, a severe mechanical failure at one of its nuclear power plants? Arnie Gundersen, nuclear engineer, calls restarting troubled San Onofre plant, "...an experiment." The new steam generators with an expected lifespan of four years only lasted ten months! Does this suggest design flaw or computer virus? Gundersen added he doesn't like being part of a process that continually just catches problems, stating about every 10 years a severe mechanical failure occurs at an American nuclear power plant! All Americans should be concerned about the state of aging nuclear power plants across the country!