Two significant admissions were made by TEPCO at the end of the week.
Scope work into the unit 3 MSIV room found multiple locations where steam pipes were leaking. The handout appears to show locations on the joints of the pipes before the main steam isolation valves where they found leaks. The section where these pipes go through the containment wall have rust traces as if those locations may also be leaking. These are obviously not the only leaks of unit 3’s containment. The structure is unable to fill with water and these leaks do not allow that large of a volume of water to leave the containment structure. They have discovered the source of the puddle of contaminated water found by robots earlier this year but this is not a situation where they have solved a larger problem as some of the press had claimed.
Read more in the handout here: http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140515_05-j.pdf
TEPCO admitted that unit 1 had lost the ability to monitor containment pressure. This has been an important component in detecting any changes to the conditions in the reactor and melted fuel. No other information was given by TEPCO about replacement sensors or an alternate method to monitor containment pressure.
Found here: http://www.tepco.co.jp/nu/fukushima-np/handouts/2014/images/handouts_140516_07-j.pdf
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