An Iranian-born engineer who worked at the largest nuclear power plant in the United States was sentenced Tuesday to 15 months in prison for taking computer software that he obtained at the plant to Iran. US District Court Judge Neil Wake ordered that Mohammad Reza Alavi's two sentences of 15 months each be served at the same time. Alavi, a naturalized US citizen, worked for the Palo Verde Nuclear Generating Station west of Phoenix for 17 years. Palo Verde officials have said the software did not contain enough information to pose a security threat. Alavi, 51, apologized in court before Wake handed down the sentence, which was more than the six months the defense had asked for but less than the prosecution sought. "I have only myself to blame for these actions and I accept full responsibility," Alavi said. "I love America and would never do anything to hurt this country."