Following up this article http://fukushima-diary.com/2012/01/m7-hit-japan-and-water-leakage-at-reactor4/
Tepco officially admitted the decreasing water level of the tank at reactor 4 was caused by the earthquake on 1/1/2012.(Source)
Tepco states the water did not flow into the tank from water cooling system but flew into the container vessel instead.
However they still have not announced they managed to fixed the broken part of the reactor.
Currently, Tepco is trying to remove the broken parts (wall) of reactor 4.
A former plant engineer tweets like below:
@cmk2wl
cmk2wl
４号機まずいな。東電HPにある写真だけど、筋交いの役割をする壁を撤去している。このタイミングで地震が来たら、横方向の力には耐えられない。（Source）
<Translation>
From the picture of Tepco, they are removing the brace of reactor 4. If another earthquake hits the plant now it can’t stand the horizontal oscillation.
<End>
He also points out the pillar for the pool may weaken the building itself.
@cmk2wl
cmk2wl
４号機。こんな補強では、プールの底面を支える事はできるかもしれないけど、建家全体には重さが負担になるのでは。(Source)
<Translation>
About reactor 4. The pillar might help to support the spent fuel pool but might add too much weight to the building.
<End>
@cmk2wl
cmk2wl
４号機。屋根トラスを撤去するのは理解できるけど、横方向の梁まで撤去してないか？ ろくな補強もしないで、これをやるのは一か八かの賭けだぞ。地震は必ず来るのに。(Source)
<Translation>
It’s rational for them to take away the ceiling truss ,but they look like they are taking out even the horizontal joist. Without a proper reinforcement – it is almost like a gamble. If another earthquake hits the reactor 4 it could collapse the building.
<End>
@cmk2wl
cmk2wl
@Portirland 爆発と放射能と高温と湿度とで酸化して、構造材だって相当に弱くなっている筈なんです。しかも傾いている。土建屋にまかせているんだとすれば、そういった変数まで計算に入れてないかも。(Source)
<Translate>
Considering the explosion, radiation, heat and humidity, the constructional material must have been so weaken because of oxidation. and it’s leaning. If Tepco outsource it all to a construction company, they might not take those risks into consideration.
<End>
Iori Mochizuki