According to NHK Japanese (7/15/2011), after the contaminated water treatment system was restarted after 30 hours in the evening of July 14, TEPCO noticed that the system was operating at a much reduced rate (37 tonnes/hour) than the system was designed for (50 tonnes/hour). So the company stopped the system in the morning of July 15 and is investigating.
No information as to which part of the system is having a problem, Kurion or AREVA.
Well, either NHK or TEPCO is not telling the truth, because 37 tonnes per hour is 74% operating rate, and that has been about the rate of operation anyway for the system. So why would this alarm TEPCO?