APR: your source for nuclear news and analysis since April 16, 2010

Tuesday, February 14, 2012

Fukushima Daiichi No. 2 temperature update

This writer's assumption of February 7 seems now confirmed by TEPCO, who are now saying that the high-reading instrument near the bottom of the reactor vessel at their 1F-2 plant is likely failed. The detector has failed a resistance check performed by TEPCO, meaning that the indication is confirmed incorrect.

It is thus safe to disregard this one outlier in terms of temperature readings at 1F-2 and continue to consider the state as announced previously by TEPCO and the Japanese government as essentially 'cold shutdown.'

3:30 PM Eastern Tuesday February 14, 2012

Author note: I do apologize to ALL of you out there whose e-mails I have not yet gotten to. I am buried under them at the moment and am trying to dig back out! Please be patient and I will answer everything which requires an answer that is in my inboxes.


  1. Obviously the thermo-couple junction was broken, since it was located at bottom in the Corium safe to assume it was consumed in the lava.

  2. @California Fire News: Probably not, since the detector has worked the entire time until now. These things do fail from age and have to be replaced.