In a fuel supply system, at least one of a first negative pressure P1 and a second negative pressure P2 is adjusted such that a width of a negative pressure range P1, P2 of a condenser in a second state, that is, the difference P2\u2212P1 of the first and second negative pressure, becomes smaller as a concentration C2 of high-octane number component of a raw fuel F0 is lower. Also, the system accepts hypothetical data with respect to investment performance and underwriter terms. The metal mats and the dowels are encased in a structural material such as concrete to form a seal which is capable of bidirectionally withstanding an overpressure due to an explosion. The experiment management unit provides power and data from the orbital vehicle related to the operation of the orbital vehicle and permits an experiment check simulation prior to integration into the launch vehicle.