"ROCKVILLE, Md. -- When commercial nuclear power was getting its start in the 1960s and 1970s, industry and regulators stated unequivocally that reactors were designed only to operate for 40 years. Now they tell another story -- insisting that the units were built with no inherent life span, and can run for up to a century, an Associated Press investigation shows.

By rewriting history, plant owners are making it easier to extend the lives of dozens of reactors in a relicensing process that resembles nothing more than an elaborate rubber stamp.

As part of a yearlong investigation of aging issues at the nation's nuclear power plants, the AP found that the relicensing process often lacks fully independent safety reviews. Records show that paperwork of the U.S. Nuclear Regulatory Commission sometimes matches word-for-word the language used in a plant operator's application.

Also, the relicensing process relies heavily on such paperwork, with very little onsite inspection and verification.

And under relicensing rules, tighter standards are not required to compensate for decades of wear and tear."

Jeff Donn reports for the Associated Press June 28, 2011 (Part 4 in a series). [2]