The Japanese government after the earthquake and tsunami that hit the Japanese archipelago last Friday, is now grappling with the emergence of the nuclear Fukushima 1. An emergency that is holding the entire planet with bated breath. Unfortunately, three days after the devastating earthquake and tsunami, while trying to 'count' victims and damage, the authorities should focus nipponiche also part of efforts towards nuclear risk. In these hours in Fukushima you struggle to prevent the world a new Chernobyl. Fears of a nuclear fusion are high even if the Tokyo denryoku, TEPCO, the company that manages the Central Authorities and the Japanese Nuclear and Industrial Safety, Nisa, have rushed to declare that the water level in the three reactors is lower than normal, but at the moment as to ensure safe conditions. In all three reactors at the Fukushima nuclear power plant 1, active at the time of the earthquake, the fuel rods are then left uncovered, or not entirely under water cooling. A fact which has triggered a real nuclear crisis in the Asian country. The emergency is taken as the maintenance of the level of the cooling water of nuclear reactors is vital. A level must be sufficient to cover all the elements that fuel the uranium fuel rods. The bars are steel tubes with a diameter of one centimeter e lunghi quattro metri, nelle quali il combustibile nucleare si trova in forma di pastiglie. Se questo livello cala, il calore di decadimento che si genera nel combustibile può causare la produzione di idrogeno, il danneggiamento delle barre, con la conseguente fuoriuscita di isotopi radioattivi nell'acqua di raffreddamento, e la fusione del combustibile. Il problema si è verificato prima nei reattori 1 e 3 della centrale di Fukushima e poi, nel reattore numero 2. Il fatto che la centrale è stata interessata da due esplosioni di idrogeno che hanno coinvolto due reattori, il numero 1 e il numero 3, è la conferma che in essi le barre di combustibile siano rimaste scoperte per un periodo sufficientemente prolungato da innescare la reazione metallo-acqua, resulting in the production of hydrogen. Unfortunately, in all three reactors there is a fault system that provides emergency core cooling. A cooling must also occur after quenching as in any nuclear fission after shut down the process of decay of fission products continues and it continues to be produced heat. This reaction continues to take place in the bars that contain the fuel. An excessive accumulation of heat can cause it to break, following the merger of the fuel and with it the release of radioactive isotopes into the environment. Fortunately, the other to Fukushima station 2, just 10 km away, the situation has stabilized in two of the three reactors. A heartening sign that leaves room for hope to be able to avoid the worst. In the Japanese government has meanwhile ordered the distribution to the population of non-radioactive iodine pills to ward off the dangers of contamination and which is protected from possible aggression, first, the thyroid radioactive. Meanwhile, this morning the fire alarm again and then returned tsunami. A new snap the occurrence of strong aftershocks with a magnitude of 6.2. The epicenter 'was identified in the Ibaraki prefecture, about one hundred kilometers from the center of the Japanese capital Tokyo.
