The head of the Chernobyl nuclear power station at the time of the world's worst nuclear power accident and two of his aides were sentenced today to 10 years in a labor camp, the maximum possible in the disaster.

After a three-week trial, most of it closed, three other officials received shorter labor camp terms.

The trial was held in Chernobyl, 11 miles southeast of the plant.

Those receiving 10-year sentences were Viktor P. Bryukhanov, who was plant director; Nikolai M. Fomin, chief engineer, and Mr. Fomin's deputy, Anatoly S. Dyatlov.

They were found guilty of gross violation of safety regulations, creating conditions that led to an explosion.