Unit 2 Update: 82 Degrees, Ever Increasing Water, What Might Be Going On
Unit 2 is now 82 degrees based on this press release. 2:15 JST Feb 12th.
They have increased core spray water flow again from 6.9m3/h to approx. 9.9m3/h.
Feed water increased slightly 7.2m3/h to approx. 7.5m3/h
TEPCO is hinting that the temperature gauge may be broken but readings do not mimic a broken gauge. Worker tweets state they do not think it is a broken gauge.
Our previous posts mentioned the possibility of laterally moving fuel and that there could be fuel on either side of the internal shroud, making cooling difficult.
In today’s discussions Dean pointed out a comment by Atomfriz on Ex-SKF that at TMI fuel became like gravel at the bottom of the reactor rather than a solid “blob”. If this is the case in unit 2,
the slowing/stopping of water flow as they did maintenance earlier in the month then resuming water flow could have caused that “gravel” of fuel to move with the water.
If this is the case increased water going in could continue to move fuel pieces around. The potential for water also leaking out could cause fuel “gravel” to pile up in an area.
We will continue to follow the changes at Unit 2 and are working on some detailed schematics.
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