On April 18, we evaluated the reliability of the thermometer (RPV bottom head 135°) which was monitored for reference based on safety regulations 138 through direct current resistive measurement. We evaluated the thermometer broken down based on the increase in direct current resistance. No large swings confirmed at other thermometers, monitoring posts, and PCV gas management system indicators. We will continue monitoring PCV temperature by thermometers (RPV bottom upper head 270° and RPV upper skirt junction 135°)
The failure of the thermocouple "69H2" (at RPV bottom head at 135 degrees) was noted in the blog post on April 15. So now there are two thermocouples left on the RPV of Reactor 2 - 69H3 and 69F2 - to measure temperatures to make sure the reactor is in the "cold shutdown state".
(Pay attention to the word "state", which makes this "cold shutdown" uniquely Japanese.)