In recent years, at a time when the importance of environmental and energy issues are being advocated, attention has turned to hydrogen energy and expectations concerning fuel cell vehicles is heightening. For fuel cell vehicles to receive widespread use, the driving range will have to be extended to around 500km - equal to that of gasoline powered vehicles. In order to achieve this, it will be necessary to increase the hydrogen fill pressure from 35MPa to 70MPa. As a result the Japan Petroleum Energy Center decided to investigate the safety criteria for hydrogen fueling stations equipped to dispense 70MPa using the risk assessment method. Two types of model hydrogen fueling stations were selected. The first was a newly constructed fueling station with a dispensing capacity of 70MPa and the second was a fueling station with an original dispensing capacity of 35MPa that had been converted to dispense 70MPa. In order to heighten the thoroughness of the investigation into potential accident scenarios, in addition to current conditions for normal operation, potential accident scenarios were also identified at the stages where hydrogen travels from the compressor to the accumulator to be stored in one cylinder at a time and where it is to be stored in all cylinders simultaneously. As a result, all potential accident scenarios used to investigate the safety criteria in hydrogen fueling stations with a capacity for 70MPa were identified allowing the details to be reported.