NHK reports that the frozen wall at Fukushima Daiichi is making progress. They cite that 80% of the 6000 monitoring points are showing temperatures below zero.
TEPCO also released a report on the frozen wall progress today. It does appear to show significant progress. That doesn’t mean the project isn’t completely resolved. Sections of the sea side frozen wall are not seeing the temperature drops other portions are. TEPCO didn’t provide additional details about this. So the question is, are these areas currently not being frozen or is something preventing those portions from freezing? Two possible problems that could cause these sections to not freeze are a high amount of groundwater flow, or a source of warm water. More information from TEPCO and more time to see how things progress could help better understand what is going on. TEPCO cited a slight increase in water levels inside the freezing area near the reactors on the sea facing side. More time should help determine if this is problematic or not.
Below are diagrams from TEPCO’s newest report:
Temperature graphs, 2nd line from top is zero.
Frozen wall temperature color chart, north side near unit 1
Land side section near unit 1 & 2
Land side section near units 3 & 4
South end section near unit 4
Sea side section near units 1 & 2
Water levels land side
Water levels sea side
Land side water levels
Sea side water levels
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