Underground structure rapidly heated by up to 40℃ when water reduced
Underground trench water gets rapidly heated when water level decreases, according to Tepco.
On 10/3/2014, Tepco released the report about the failed frozen water wall project. (cf, Tepco to give up the preceding frozen wall and directly fill the trenches with cement instead [URL])
This wall was expected to separate the basement floor of T/B (turbine building) and underground trenches, where extremely highly contaminated water is still retained so they can pump up the retained water from the trenches. If they don’t separate them, coolant water keeps coming from T/B into the trenches even though they pump up the retained water.
In this report, it is stated that water retained in the underground trench got rapidly heated when water level decreased in T/B.
It was the connection part of an underground trench and Reactor 2 T/B. The temperature was measured beside the failed frozen wall.
The rapid increase of temperature was observed a couple of days after the water level decrease. In total, they measured the increase at 5 locations twice.
The largest increase was 40℃ (-30℃→+10℃). The water level of T/B decreased by only 20cm but the water temperature increased by 40℃ from 8/17/2014 to 8/19/2014.
The second largest increase was approx. 35℃.
Tepco assumes it was probably because warm water moved in the underground trench to deny any other hypotheses such as heat is generated by something underground. However, none of the supportive and related data has been published.
http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_141003_03-j.pdf
The post Underground structure rapidly heated by up to 40℃ when water reduced appeared first on Fukushima Diary.
Source: http://fukushima-diary.com/2014/10/underground-structure-rapidly-heated-40%e2%84%83-water-reduced/
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