As of April 2, 2011.
HoA’s Cause for Concern is based on a 1-10 scale.
Reactor No. 1
Hidehiko Nishiyama, an official with Japan’s nuclear and industrial safety agency,said that Japanese authorities’ data indicates only 3% damage to the unit.
Workers are preparing to inject nitrogen into the No. 1 reactor in an order to prevent another explosion caused by a buildup of hydrogen. (A hydrogen explosion — an indicator of possible core damage — blew the roof and upper walls off the building housing the reactor on March 12.)
A Tokyo Electric official said that iodine-131 levels in ground water from a pipe near the No. 1 reactor had 10,000 times the standard limit. Japanese Chief Cabinet Secretary Yukio Edano addressed this confusion in a press conference later Friday, noting that a “constant amount of radiation” appeared to be getting into the groundwater and noting that further tests are forthcoming.
Water levels in an exposed maintenance tunnel leading from the No. 1 unit’s turbine building had dropped 1 meter from its previous measure which is a concern to many as the water levels need to stay stable to avoid a meltdown.
Reactor 1’s core has been damaged, but its containment vessel was not with the later being a relief as the containment vessel is a concrete and steel structure that keeps radioactive material inside the reactor.
Lighting and power has been restored to the No. 1 units’ control room, though the overall power supply is less than desired.
Fresh water was injected both into the unit’s reactor core and its spent nuclear fuel pool on Sunday 03/27/11, said an official with the Tokyo Electric Power Co. This is in place of the saltwater that had been used for the same purpose, to cool nuclear fuel rods in the reactor and spent fuel pools. Besides its cooling purposes, experts hope the fresh water will help flush out salt to allow better operation of the cooling system.
Work resumed on Sunday to pump water out of the basement of the No. 1 unit’s turbine building. Earlier tests indicated the presence of radioactive material in this pooled water, though not at nearly as high levels as those in the turbine building basements of the Nos. 2 and 3 reactors.
Tsunehisa Katsumata, chairman of Tokyo Electric Power Company that runs the nuclear power plant, said Wednesday, “Looking at current conditions, there are no (future) options other than decommissioning” Reactor 1, meaning that the reactor would never produce electricity again.
Heart of America (HOA)s CAUSE FOR CONCERN RATING: 7
Reactor No. 2
NEW::: A 20 cm (8 inch) crack in a 2 meter deep, concrete lined basint was found leaking water into the sea, measuring 1,000 millisieverts of radiation per hour, more than 330 times the annual average and can result in vomiting and up to a 30 percent higher risk of cancer, TEPCO poured concrete into the pit to stop the leak, but water prevented it from hardening and the leak had yet to be stopped.
Today, a planned 2 day project to install a camera in an exposed maintenance tunnel to help pinpoint leaks in reactor #2 began.
According to my on the ground sources, No. 2 reactor core has suffered a 33% meltdown.
Currently, there is a plan to inject nitrogen into the No. 2 reactor in order to prevent a buildup of hydrogen that might cause an explosion in an effort to not repeat March 15th’s explosion.
Workers have been pumping freshwater into Reactor 2 damaged unit’s reactor core and spent fuel rod chamber. The building housing of Reactor 2 has said to be only slightly damaged.
Lighting has been restored to Reactor 2s’ control room, though the overall power supply is less than desired.
Radiation levels in pooled water tested in the No. 2 nuclear reactor’s turbine building are 100,000 times normal, utility company and government officials said Sunday, correcting an earlier finding of 10 million times normal. The reading applies to radioactive iodine-131, which has a half-life of eight days.
Iodine-134, which loses half its radioactive atoms every 53 minutes, was at less than a detectable amount, officials said, correcting an earlier figure of 2.9 billion becquerels per cubic centimeter.
Statements on the Caesium 137 and the detailed information on the 3 levels of Plutonium were, conveniently, not mentioned by the Japanese government.
Damage is “suspected” in Reactor 2 unit containment vessel which keeps the radiative components from spilling into the environment although the amount of damage is inconclusive. It is said by the Japanese government that even though the temperature and pressure levels are “unknown,” the containment vessel pressure is considered “stable”.
Katsumata said Wednesday that, “looking at current conditions,” the No. 2 reactors would be decommissioned — meaning it would never be used to produce electricity again.
Heart of America (HOA)s CAUSE FOR CONCERN RATING: 10
Reactor No. 3
The No. 3 reactor has been of particular concern, experts have said, because it is the only one to use a combination of uranium and plutonium fuel, called MOX, considered more dangerous than the pure uranium fuel used in other reactors.
The building of the No. 3 reactor was “severely damaged” after an explosion caused by the buildup of hydrogen gas in Reactor 2. Its core reactor is also damaged and its fuel rods are either partly or fully exposed.
As to its pool of spent nuclear fuel, reports are that the pool was “possibly damaged” and the water level has been low which is one of the reasons for the repeated spraying.
Currently, there is a plan to inject nitrogen into the No. 3 reactor in order to prevent a buildup of hydrogen that might cause an explosion in an effort to not repeat March 15th’s explosion in Reactor 2.
The water levels in the exposed maintenance tunnel leading from the No. 3 unit’s turbine building has decreased by 1.5 meters and have pooled in the underground tunnels by Reactor 3.
Authorities took measure to drain the tunnel to prevent the water from overflowing and entering the environment.
On Friday, officials stated that the draining process was a confirmed success.
However, it has been noted that the Plutonium, Iodide and Caesium has been found in the atmosphere in “small” doses yet officials refuse to give exact measurement.
The cooling pool where the spent fuel is stored may also have been damaged and workers used a concrete pump to douse the spent fuel pool with water on Tuesday 03/29/11.
Fresh water is being being pumped into the No. 3 reactor core and the spent nuclear fuel pool. This replaces the seawater that had been used previously. The aim of using fresh water is to cool down nuclear fuel and flush out accumulating salt that might hinder the reactors’ existing cooling systems while preventing corrosive action as was noted in Reactor 2.
Work continued to be halted in the basement of the No. 3 unit’s turbine building, as authorities tried to work around contaminated water pooled there. Plans are being devised on safely and efficiently removing that tainted water.
The Japan Atomic Industrial Forum, an industry trade group that is tracking official accounts of the cleanup efforts at the Fukushima Daiichi plant, said the pressure of the No. 3 reactor’s containment vessel has changed their assessment to “unknown”.
Tsunehisa Katsumata, chairman of Tokyo Electric Power Company that runs the nuclear power plant stated, “Looking at current conditions, there are no (future) options other than decommissioning” Reactor 3 meaning that the reactor would never produce electricity again.
Heart of America (HOA)s CAUSE FOR CONCERN RATING: 9
Reactor No. 4
Fresh water was injected both into Reactor 4’s reactor core and its spent nuclear fuel pool on Friday 04/01/11 with a concrete pump. This is in place of the saltwater that had been used for the same purpose, to cool nuclear fuel rods in the reactor and spent fuel pools. Besides its cooling purposes, experts hope the fresh water will help flush out salt to allow better operation of the cooling system.
Workers restored power in the reactor’s control room Tuesday, 03/29/11 — a move that officials say could be a key step in efforts to bring cooling systems back online.
This reactor was offline in a scheduled outage so the reactor’s water level and pressure was considered “safe” when the earthquake hit. Still, it has had several major problems since then, including a March 15 fire that damaged the building that houses the reactor.
The nuclear fuel rods were in the unit’s spent fuel pool which is considered “possibly damaged” but not in the reactor itself.
Tsunehisa Katsumata, chairman of Tokyo Electric Power Company that runs the nuclear power plant stated, “Looking at current conditions, there are no (future) options other than decommissioning” Reactor 3 meaning that the reactor would never produce electricity again.
Heart of America (HOA)s CAUSE FOR CONCERN RATING: 6
Reactor #5
Reactor No. 5 was not in operation at the time of the earthquake and are in “cold shutdown” according to the Japanese government..
The reactors were shut down for a scheduled outage when the quake hit and there are no major issues with the reactors and cores themselves.
The cooling systems in the pools of spent nuclear fuel are thought to be functioning, though there are continued concerns about keeping power running to the systems.
Three holes were punched in each building earlier to relieve pressure and prevent a feared hydrogen explosion.
Heart of America (HOA)s CAUSE FOR CONCERN RATING: 2 unless the power fails or hydrogen builds up.
Reactor No. 6
Reactor No. 5 was not in operation at the time of the earthquake and are in “cold shutdown” according to the Japanese government..
The reactors were shut down for a scheduled outage when the quake hit and there are no major issues with the reactors and cores themselves.
The cooling systems in the pools of spent nuclear fuel are thought to be functioning, though there are continued concerns about keeping power running to the systems.
Three holes were punched in each building earlier to relieve pressure and prevent a feared hydrogen explosion.
Heart of America (HOA)s CAUSE FOR CONCERN RATING: 2 unless the power fails or hydrogen builds up.
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