June 15, 2011
- Tokyo Electric Power Co. (TEPCO) has begun full operation of seawater filtering systems near the Fukushima Daiichi nuclear energy facility. Installed near the water intakes of reactors 2 and 3, the filters absorb radioactive cesium then return the water to the ocean. Tests indicate the system reduces cesium levels by 20 percent to 30 percent. TEPCO is seeking ways to increase the filtering capability.
- Japan’s health ministry has ordered TEPCO to release from duty 23 workers who had been exposed internally to more than 10 rem of radiation early in the accident. The ministry took the precaution because the employees’ continued work at the facility could result in exposure beyond the temporary 25 rem limit. The limit was raised in March from 10 rem to the emergency level of 25 rem. TEPCO said earlier that two workers were exposed to more than 60 rem and announced on Monday that six more were believed to have been exposed to up to 50 rem. TEPCO is screening 3,700 workers for exposure.
- TEPCO has completed tests on a U.S.-made system that will be used to absorb radioactive cesium from water that has accumulated in various locations at the Fukushima Daiichi site and has also begun tests of a French-manufactured water-treatment device. The company plans to begin full operation of the systems by Friday. More than 105,000 tons of radioactive water has accumulated at the facility. The U.S.-based water treatment system is from Kurion Inc. and the French system is from AREVA.
- Inspection of farmland in the no-entry zone around Fukushima Daiichi will begin next month. Rice planting has been suspended within an 18.5-mile radius of the plant and no agricultural products are being shipped from within the no-entry zone. Government officials will study soil in the area in response to concerns from residents who have inquired about the status of their farmland.
- TEPCO plans to install rooftop vents for the seven reactor buildings at the Kashiwazaki-Kariwa nuclear energy facility in north central Japan. The vents are designed to prevent hydrogen from building up during an emergency. Hydrogen build-up caused explosions at the Fukushima Daiichi facility in March.