Fukushima nuclear power plant accident in the first Toukyoudenryoku April 18, take the water from the overflowing water in the tank from the Unit 2 spent fuel pool, announced that it has detected high concentrations of radioactive material. That might have damaged the fuel stored in pools. TEPCO announced on April 17, the roadmap for the convergence of the accident, showed a 6 - to stabilize the primary goal after nine months, if there is a new fuel damage, the difficulty of the convergence plan might be. According to TEPCO, the water collected on April 16, cesium-137 becquerels of cesium 134 and 150,000 of the 160,000 becquerels per cubic centimeter, iodine-131 detection of the 4100 Becquerel. Most would not normally be detected. Damaged or spent fuel pool, which is considered to be leaking into the tank of radioactive material from nuclear reactors. Meanwhile, the Ministry of Economy Nuclear Safety Agency April 18, in the basement of Unit 4 reactor building, presentation and found a depth of 5 meters of water entrapment. Water has accumulated in four or tsunami, that there is a possibility that the inflow of water from the adjacent Unit 3. NISA also examining the amount of radiation in the reactor building on April 17 by moving the robot by remote control, the No. 1 to 10 mSv per hour at 49 and 28 mSv per hour at the No. 3 Datsu 57 or announced. Dose limit for workers in a nuclear accident in the Fukushima No. 250 mSv per year if 57 mSv per hour, run over four and a half hours. NISA is still very difficult tasks in the building, which hopes to devise a lower dose. According to TEPCO, the amount of radiation in the reactor in operation is usually about 0.01 mSv per hour.Dosimetry advanced robotic TEPCO reactor in the No. 2 most likely a high dose.To recover at an early stage of the reactor cooling is required to work within the reactor building, is a focal point of the dose in the building.Meanwhile, TEPCO for the transfer of accumulated high levels of contaminated water wells and building stand out No. 2 turbine building, water leakage countermeasure advanced centralized waste treatment facility in which to store.
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