PHOENIX - A former engineer at the nation's largest nuclear power plant has been charged with taking computer access codes and software to Iran and using it to download details of plant control rooms and reactors.

Mohammad Alavi, who worked at the triple-reactor Palo Verde power plant west of Phoenix, was arrested April 9 at Los Angeles International Airport when he arrived on a flight from Iran, authorities said.

He is charged with a single count of violating a trade embargo that prohibits Americans from exporting goods and services to Iran. If convicted, he would face up to 21 months in prison.

According to court records, the software is used for training plant employees, but allowed users access to details on the Palo Verde control rooms and the plant layout. In October, authorities alleged, the software was used to download training materials from Tehran, using a Palo Verde user identification.

The FBI said there was no evidence to suggest the software access was linked to the Iranian government, which has clashed with the West over attempts to develop its own nuclear program.

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