Rolf Ziesing, Westinghouse's director of nuclear licensing, said the shield building design "was the focus of intense regulatory review" and improvements were made as a result of concerns expressed by critics.
Mr. Wenig said minors would be able to buy most items available on the site, but eBay would design ways to shield younger users from viewing or purchasing adult content and products.
The blue box design could have been a purple oval or remained a yellow and black shield (the logo before the blue box), and the result would have been the same.