Bloomberg: Republican presidential candidate John McCain promotes nuclear power as a central element of his energy plan, boasting in particular about the safety record of the Navy’s reactor-propelled fleet. “We have been sailing nuclear ships around the world for 60 years, never had an accident,” McCain, an Arizona senator and former Navy pilot, said July 22 in Rochester, New Hampshire. Only two days later, the Navy disclosed that one of its nuclear submarines, the USS Houston, had been …