As the nuclear crisis in Japan's crippled Fukushima I Nuclear Power Plant appears to worsen, Japan’s nuclear safety agency raised their assessment of its severity from 4 to 5 on the 7-level International Nuclear Event Scale, the same rating given the 1979 Three Mile Island crisis. Japan's Prime Minister, Naoto Kan, said bluntly that the situation at the nuclear power plant was "very grave". Weather forecasts indicate changing winds may begin moving radiation closer to Tokyo by March 30.
Efforts thus far to  cool nuclear fuel in the  reactors and the  spent-fuel pools has produced little if any success, contends United States government officials.
Engineers are working frantically to connect electrical power to two reactors in the plant, as well as to restart the cooling systems and  prevent overheating of fuel rods. Tokyo Electric Power Co. stated that it hopes to reconnect a power line needed to restart water pumps to the No. 1 and No. 2 reactors by Saturday morning.  However, a TEPCO official cautioned  that if the water pumps were damaged by the tsunami, they could fail to restart. 
The extent of the damage to the plant's reactors is still unclear. Japanese officials have concentrated  on cooling spent fuel rods in  Reactor No. 3's  storage pool. On Friday, however, steam was seen rising from Reactor No. 2., where an explosion occurred on Tuesday. Additionally, engineers said on Thursday that the steel lining of the storage pool at Reactor No. 4 and its concrete base seemed damaged, as  attempts to refill the pool with water became increasingly difficult.
In a briefing on Friday, Philippe Jamet, a commissioner at France's nuclear regulator Autorite de Surete Nucleaire,  said, "We must avoid being overly optimistic. This will likely take human intervention like going into control rooms to reconnect valves." 

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Japan raises severity level of crisis; efforts to cool damaged nuclear power plant continue