It shall be unlawful for any person to wilfully enter or trespass within the premises of any person, firm or corporation manufacturing or constructing or erecting or assembling or maintaining or repairing or operating any nuclear powered machinery, equipment or vessels, or rockets, missiles, propulsion systems, explosives or other dangerous devices, or parts thereof, with the intent to commit any crime under the laws of this state, or of the United States, or pursuant to a conspiracy to commit any such crime or in an attempt to commit any such crime. Any person convicted of a violation of this section shall be adjudged guilty of a felony, and punished by a fine not to exceed five thousand dollars ($5,000.00) or by imprisonment in the state penitentiary not to exceed five (5) years, or both such fine and imprisonment, in the discretion of the court. Any person wilfully entering or trespassing within such premises, if found within any area designated as a restricted area therein, shall be guilty of a violation of this section.