Bloomberg: John McCain’s plan to revive the U.S. nuclear power industry with 45 new reactors may cost $315 billion, with taxpayers bearing much of the financial risk. The Republican presidential nominee wants the plants built in time to help the U.S. meet a 29 percent increase in electricity demand by 2030. Industry estimates put their cost at $7 billion each. Barack Obama, McCain’s Democratic opponent, is less specific about his plans, saying he wants to “find ways to safely harness nuclear …