What is happening in japan with this radiation?

Question:

i have just been reading the sun and it says people are being tested for radiation? what is all this about i am completely lost whats actually happening in japan all i know is there was an earth quake which caused a tsunami. the pictures look like its the end of the world so so upsetting :'(

Answer:

Cooling system of 2 nuclear power plants were damaged by the earthquake and tsunami. They are trying hard to prevent meltdown.

Resident who lived around the plants were ordered to evacuate. They are local resident.