Temperatures measured at the bottom of the Unit 3 Reactor Pressure Vessel at Fukushima Daiichi Nuclear Power Station
Here are the measurement results of temperatures at the bottom of the Unit 3 Reactor Pressure Vessel
at Fukushima Daiichi Nuclear Power Station.
- ※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
at the bottom of the Reactor Pressure Vessel:
・Temperature at the bottom of the Reactor Pressure Vessel: Within 80℃
Announcement
- ○From February 27, 2020, Temp(1) (TE-2-3-69L1), Temp(2) (TE-2-3-69L2) and Temp(3) (TE-2-3-69L3) above are displayed as “-“ based on the announcement on November 30, 2017.
- ○On November 30, 2017, deficiencies were found in parts of the cables leading inside the pedestal below the Unit 3 Reactor Pressure Vessel (RPV), for three of the nine thermometers installed at the bottom section. Those three thermometers are considered to be broken because they were unable to measure the temperature there. Therefore, thermometers (temperature (1), temperature (2) and temperature (3) as above) have been excluded for monitoring the operational limit of being within 80 degrees at the RPV bottom section, as defined by Article 18 (Reactor water injection system) of the Specifications for Specified Nuclear Facility in Implementation Plan III. Monitoring is being carried out by the remaining six thermometers.
- ○Data may change or be missing due to equipment failure or regular inspections.
