There have been a number of minor development in recent weeks. We have gathered them here to explain.
TEPCO will be replacing the gas management hoses installed in units 2 and 3. These were small plastic hoses will be replaced over the next week. They will also be testing and checking the emergency nitrogen injection system installed at the plant after the disaster.
There was a moderate earthquake at the plant on November 19th. TEPCO reported no damage to key systems at the plant.
The unit 1 discharge canal saw a significant drop in radiation levels in the water. The beta radiation level had already dropped to 13,000 on November 18th from much higher fluctuating levels. By November 20th the beta radiation was 8,800. Levels in this area began to drop after the last section of the steel wall was closed. It is still to early to confirm for sure that this change will permanently change the radiation levels in the canal. TEPCO also began pumping out the subdrain pits near the reactor buildings around the same time. That water is then sent into the water treatment system for eventual release.
At unit 3 pieces of large rubble in the spent fuel pool have been removed. TEPCO reports this but provided no photos or video.
Work began to remove small concrete rubble from the top of unit 1 with a large vacuum hung from a crane.
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