The only operating reactor in Japan has developed a problem with its condenser system. Detection of conductivity was found in the secondary loop system indicating sea water was leaking from the condenser. In pressurized water reactors of the type at Sendai there is a middle piping loop to transfer heat so that the sea water is never in direct potential contact with the reactor water.
Currently the demineralizer system has been able to remove the salt leaking into the secondary loop. Kyushu power says they will hold the reactor at 75% power until the condenser leak can be investigated. Depending on the extent of the problem they may be able to continue operating or defer repairs until the next refueling outage.
Meanwhile at the nearby Sakurajima volcano concerns for a major eruption have escalated. The Showa vent on the volcano has plugged up with debris and now the volcano is seeing increasing pressure.