Temperatures measured inside the Unit 1 Primary Containment Vessel at Fukushima Daiichi Nuclear Power Station

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

Monitoring points

※Here are the measurement points for each temperature.
※For reference: The following is the “Limiting Conditions of Operations” designated in the implementation plan for temperatures
inside the Primary Containment Vessel:
　　　・Temperature at the bottom of the Reactor Pressure Vessel: Within 80℃

Pressure inside Unit 1 PCV has been lowered to be safe by increasing exhaust gas flow rate of gas control facility since April 4 in order to minimize risks of emitting dust during the operation of forming an access route for the PCV internal investigation at the Unit. We regard fluctuations for a part of temperature readings inside the PCV occurring in conjunction with the above as being within the range of past performance at this moment.
Data may change or be missing due to equipment failure or regular inspections.

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Temperatures measured inside the Unit 1 Primary Containment Vessel at Fukushima Daiichi Nuclear Power Station