The utility model discloses a non - is actively tested initial operating mode and is establish auxiliary system, be provided with electric check valve A and venturi meter on the active loop system's of every non - the water return pipe, be provided with electric check valve B on the active loop system's of every non - the outlet pipe line, electric check valve A and electric check valve B constitute electric check valve group, the intercommunication forms the by -pass line between the active loop system's of same non - water return pipe and the outlet pipe line, be provided with the return circuit stop valve on this by -pass line, still include high temperature high voltage shielding pump, the play water end (W. E. ) of high temperature high voltage shielding pump and the active loop system's of all non -s water return pipe intercommunication, the intake end and the active loop system's of all non -s of high temperature high voltage shielding pump outlet pipe line intercommunication. The utility model discloses one set of experimental apparatus debugging can be provided and the required auxiliary system of the initial operating mode of experiment is found.