TEPCO kindly updated us with the bad weld and rust on the batch processing tanks in ALPS multi-nuclide removal system (see my posts from June this year here, here, here and here) on August 7, 2013. But I thought the title of the page was funny (emphasis is by me):
"Plan to halt Line B because of the leak from the batch processing tanks in Multi-Nuclide Removal System and the result of additional investigation"
It turns out that this additional investigation has found corrosion and rust in one of the multi-nuclide absorption tower vessels. The absorption material inside the vessel was due for exchange, so TEPCO decided to take a look inside the vessel. This is what they found:
From TEPCO's Photos and Videos Library 8/7/2013:
Flange of the inspection hole:
Rust around the weld, inside the vessel:
These were not supposed to happen.
From PDF document, page 2 (English labels are by me):
Here's the system diagram of ALPS. There are three lines, A, B and C.
In my June 20, 2013 post, I wondered:
how about the same tanks in other two lines? What about other tanks and vessels that are all welded?
The tanks and towers for ALPS were made by Toshiba (most likely Toshiba's subcontractor), and the weld was inspected by Toshiba before they were deployed at Fukushima I Nuclear Power Plant, according to independent journalist Ryuichi Kino when I asked him back in June when the batch processing tanks were found with bad weld and leak.
What has happened to the technological and manufacturing might of Japan? (Or was it a myth after all?)