Heat from exposed fuel rods splits water coolant into Hydrogen & Oxygen then explodes.
Explosion damages containment of Fuel. Rods exposed and melting.
Japan has bad past record of disclosure of Atomic leaks, Second Reactor uses both Uranium and Plutonium as fuel (MOX).
This is a real mess, radiation will cross ocean to USA West coast.
Harmful radiation at levels 20 times the annual limit is spewing from Japan’s quake-hit Fukushima No.1 atomic power plant after a fire broke out at its number-four reactor, people within 30 kilometres of the facility told to stay indoors or risk getting radiation sickness.
Higher than normal radiation levels have reportedly been detected in Tokyo, As of 10.22am local time, 400 millisieverts of radiation were detected at the No. 2 and No. 3 reactors, Chief Cabinet Secretary Yukio Edano told reporters. That is 20 times the annual limit for nuclear industry employees and uranium miners, according to the World Nuclear Association.
Mr Edano told reporters that the suppression pool of the No.2 reactor at the Fukushima No.1 plant appeared to have been damaged. The pool forms the base of the container vessel which seals the fuel rods.
A huge explosion hit the building housing the number-two reactor early today, the third blast at the plant since Saturday. Hydrogen explosions have previously hit Unit 1 and Unit 3.