17 Juin 2013
Decontamination device leaking at Fukushima plant
Workers at the disabled Fukushima Daiichi nuclear power plant have found contaminated water leaking from a newly-installed filtering system.
Tokyo Electric Power Company officials say the leak was discovered on Saturday during an inspection of the Advanced Liquid Processing System.
The system can filter almost all types of radioactive material. The utility has been testing the system since March.
The officials say the leak occurred at a welded part of a storage tank for radioactive water. They say water has dripped into a pan below and has not leaked outside of the system.
The officials say they are unable to determine the exact amount of water that leaked as it is mixed with condensation from the surface of the tank.
The radiation level of gamma and beta rays in water on the surface of the welded part was 0.18 millisieverts per hour.
TEPCO has halted the test-run of the system and is investigating the cause of the leak. The officials say faulty welds may be the cause of the problem.
Jun. 17, 2013 - Updated 10:29 UTC
Tokyo Electric Power Co. suspended a test run of a water decontamination system at the Fukushima No. 1 nuclear power plant on June 16 after a suspected leak of highly radioactive water.
A welded part on the surface of the tank for the Alps water decontamination system measured 0.2 millisievert per hour, a radiation level higher than in surrounding areas. TEPCO is investigating the situation.
The cylindrical tank, which is 6 meters tall and 3 meters in diameter, held 25 tons of radioactive water before processing.
A worker who was checking condensation on the surface found traces of brown water at around 11 p.m. on June 15. TEPCO suspects that water leaked from the welded part.
Alps can remove 62 radioactive substances, including strontium, from contaminated water.
The test run, which started in March, was to finish at the end of July. If the leak is confirmed, the completion of the test run will be delayed.
The Alps water decontamination system at the Fukushima No. 1 nuclear power plant (Provided by TEPCO)