Hi Gary (& all);
It seems that the pumping situation has not yet brought the temperatures across the reactors, fully under control at Units 2, 3 and 4 yet, either.
IAEA says:
Quote:
Unit 1:
The indicated temperature at the feed water nozzle of the RPV {Reactor Pressure Vessel} of Unit 1 has decreased from 323 oC to 281 oC and at the bottom of RPV remained stable at 134 oC. There is a corresponding decrease in Drywell pressure.
Unit 2:
At Unit 2 the indicated temperature at the feed water nozzle of the RPV has increased from 154 oC to 177 oC and at the bottom of RPV has increased from 78 oC to 88 oC. Indicated Drywell pressure remains at atmospheric pressure.
The temperature of the spent fuel pool is 46o C as of 19:00 UTC 29 March.
Unit 3: the indicated temperature at the feed water nozzle of the RPV is about 75 oC and at the bottom of RPV is about 116 oC. The validity of the RPV temperature measurement at the feed water nozzle is still under investigation.
Unit 4:
For Unit 4 it was planned to commence pumping freshwater into the spent fuel pool on March 29. The IAEA has not received information on implementation of spraying activities in units 1 and 4.
Units 5 and 6: remain in cold shutdown
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Tricky to interpret what al this means in terms of the criticality level.
IAEA says:
Quote:
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Overall at the Fukushima Daiichi plant, the situation remains very serious.
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..and all this is apart from the worker casualties which have occurred, and the contamination of the water table and the offshore environment.