Here are the measurement results of hydrogen concentrations inside the Unit 1 Primary Containment Vessel at Fukushima Daiichi Nuclear Power Station.

Monitoring points

Monitoring points

hydrogen concentrations

hydrogen concentrations
  • Here is the measurement method for each hydrogen concentration.

  • A hydrogen concentration will be displayed as 0.00% when the measurement result is less than 0.00%.

  • For reference: The following is the “Limiting Conditions of Operations” designated in the implementation plan for hydrogen
    concentrations inside the Primary Containment Vessel:
    ・Hydrogen concentration inside the Primary Containment Vessel: Less than 2.5%

Announcement

  • Data may change or be missing due to equipment failure or regular inspections.

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  6. Hydrogen concentrations measured inside the Unit 1 Primary Containment Vessel at Fukushima Daiichi Nuclear Power Station