Tokyo Electric Power Company says temperatures in Reactor 4 fuel pool shot up again,  this after they injected almost 200 tons of water before the weekend.  TEPCo will try injecting more water on 25 April.  Reactor 4 fuel pool seems to be losing water faster than they can put it in.  They are concerned the building is too damaged to inject anymore water.

TEPCo also says that Fukushima Daiichi’s Reactor 1 is more damaged than thought.  They believe that 70% of  Reactor 1’s fuel rods are damaged, and they are having trouble maintaining water levels.  They have been injecting water at a rate of 6 tons per hour.  TEPCo wants to try building a new heat exchanger building, to cool the water they are injecting.  In fact TEPCo is having major problems keeping all the reactors cool.

The situation around the Fukushima Daiichi nuke plant is not getting better.  Radiation contamination is spreading, and increasing.

Officials say the radiation levels at the damaged nuclear plant continue to increase, making it more difficult for workers struggling to get the facility under control.  Tokyo Electric Power Company says radiation levels at the nuclear reactor buildings are still to high for humans to approach.

Radiation levels are increasing outside the now mandatory evacuation zones.  The Fukushima state government has issued a warning to people outside the evacuation zones, saying they should limit their time outdoors.  School playgrounds and public parks are being monitored for contamination.  Already five public parks, outside the evac zones, are showing contamination at, or above, the safe limits set by the prefectural government.  Officials are telling residents, and visitors, to limit their time at those parks to no more than one hour per day.

The increasing radiation levels being reported by local governments contradicts the Japanese Prime Minister’s office, which said the risk of radiation leaks is receding.

Tokyo Electric Power Company admits Fukushima Daiichi’s Reactor 1 has a damaged core.

It would explain the high levels of radioactive water coming from the building.  TEPCo thinks the core is breached, allowing radioactive steam to enter the containment vessel.  That’s mixing with the water in the containment vessel, which is also leaking.  To make the problem worse, the fuel rods in the core are still partially exposed, and breaking down.

TEPCo wants to continue injecting water, which they are doing at a rate of 600 tons per hour.  The Japanese Nuclear and Industrial Safety Agency is warning that they think Reactor 1 is damaged so much that it can not handle anymore water injection.  If TEPCo is injecting water at 600 tons per hour, and they still can’t cover the exposed fuel rods, obviously the water is leaking out faster than they can put it in.  That suggests sizable damage.

So, TEPCo is dealing with a conundrum; adding more water could further damage the structure, making things worse, but not injecting water will expose more fuel rods, making things worse.

Tokyo Electric Power Company is worried about Reactor 4, at the Fukushima Daiichi nuke plant.  They think the spent fuel pool has been too damaged by the 9.0 quake, and the many aftershocks, that they can’t inject anymore water to keep fuel rods cool.

On 22 April, the temperature shot up 50 degrees Celsius, above normal, and 200 tons of water had to be injected.  TEPCo is now monitoring the structure of the building as well as the spent fuel pool temps.  The spent fuel pool holds more than 1,000 fuel rods, including active rods that had just been removed from Reactor 4, for scheduled maintenance, before the 11 March disasters.