about the possible dangers. >> what is critical for a safe operation of a nuclear reactor is the functioning of a cooling system of a reactor core. so if you can imagine, it's a sort of big pool in to which the fuel rod's inserted. and it has to have a constant supply of cold water to keep that core and that nuclear fuel at a certain temperature. and of course that system relies on a supply of water. that supply of water depends on the functioning of the pumps that pump that water to the core and the pumps rely on electricity. there are backup electricity systems should the main power grid go out. that's standard for every nuclear power plant. those are diesel generators that and then there is also batteries for redundancy. but in a full-scale invasion in