TEPCO discovered that not enough water was flowing through one of the 4 subsystems, and suspects it's clogged up somewhere.
And a bit of new information that the Kurion's system removes not just cesium but technetium and iodine, according to the press conference handout from TEPCO which is found below.
By the way, the number of pipe leaks in the Areva's system was not "over 10". Well, it was "over ten" for sure, but it was actually 48.
From Yomiuri Shinbun (11:45AM JST 6/12/2011; diagram of Kurion's system added):
東京電力は１２日、福島第一原子力発電所にたまった高濃度汚染水を処理する装置の試運転が、１３日以降にずれ込む可能性があると発表した。
TEPCO announced on June 12 that the test run of the system to treat highly contaminated water at Fukushima I Nuclear Power Plant would be delayed after June 13.装置の一部で水が十分に流れないトラブルが発生したためで、原因究明を急いでいる。
The delay was due to the problem in one of the systems where less amount of water was processed than planned. TEPCO is investigating.
米キュリオン社製のセシウムを吸着して除去する装置で、４系統ある処理過程のうち１系統でポンプを動かしても十分な量の水が流れず、どこかで詰まっている可能性がある。残り３系統だけで動かすこともできるが、その場合、処理速度は７５％に落ちるという。
The system in question is the Cesium Absorption Tower by the US company Kurion. There are 4 subsystems, and the water that flowed through one of them was much less than planned. It is possible that the subsystem is clogged somewhere. TEPCO could run the remaining 3 subsystems, but the water processing speed would decrease to 75% of the full capacity.
[Diagram of Kurion's system, English labels added; from TEPCO's press conference handout on June 12]
水漏れの可能性がある配管接続部４８か所の補修と、１１日に不具合が見つかったポンプの制御プログラムの修正は完了した。
TEPCO finished the repair of the 48 leaks in the pipes. The company also finished correcting the mistakes in the software program that controls the pumps, which were discovered on June 11.
