PHOENIX (AP) - A former engineer at the nation's largest nuclear power plant has been arrested and accused of illegally taking software to his Iranian homeland and downloading details of control rooms, reactors and designs of the triple-reactor facility west of Phoenix, authorities said.

Mohammad Alavi, 49, was taken into custody on April 9 at Los Angeles International Airport and is being held without bond in California. He denies any wrongdoing, his lawyer said.

Alavi is charged with a single count of violating a trade embargo, which prohibits Americans from exporting goods and services to Iran, according to federal authorities.

The FBI said there's no evidence to suggest the software disappearance was linked to terrorists or the Iranian government, which has clashed with the United States over attempts to develop its own nuclear program.

Officials with Arizona Public Service Co., a Phoenix-based utility company that operates the Palo Verde Nuclear Generation Station, said the software does not pose a security risk because it doesn't control any of the nuclear plant's operating systems and is mostly used to train employees.

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