Fukushima pipe leaking radioactive water: TEPCO

Sep 01, 2013
Image taken by TEPCO on August 26, 2013 shows Toshimitsu Motegi, the Japanese Economy, Trade and Industry Minister, inspecting the Fukushima plant. TEPCO said Sunday it had found highly radioactive water dripping from a pipe used to connect two coolant tanks.

The operator of Japan's stricken Fukushima nuclear plant said Sunday it had found highly radioactive water dripping from a pipe used to connect two coolant tanks, patching it up using tape.

TEPCO has long struggled to deal with the growing volume of now it has used to cool reactors that went into meltdown after being struck by an earthquake and tsunami in 2011, and the latest find comes as the government has promised to play a greater role in the plant's clean-up.

The discovery of the pipe came a day after Tokyo Electric Power Co (TEPCO) said it found new radiation hotspots at four sites around tanks, with one reading at 1,800 millisieverts per hour—a dose that would kill a human left exposed to it in four hours.

The pipe, which was found dripping one drop per around 90 seconds and was repaired using adsorption material and plastic tape, accounted for one of the four sites. Water with a radioactivity of 230 millisieverts per hour was found below it, TEPCO said.

Last week the plant operator admitted 300 tonnes of toxic had seeped out of one of the vast containers—one of around 1,000 on the site—before anyone had noticed.

The spill sparked fears the toxic water may have seeped into the nearby ocean and was categorised as a Level 3 event, the most serious category since the meltdown itself.

Image taken by TEPCO on August 26, 2013 shows Toshimitsu Motegi, the Japanese Economy, Trade and Industry Minister, inspecting the Fukushima plant. Last week TEPCO admitted 300 tonnes of toxic water had seeped out of one of the vast containers.

In response to growing domestic and international criticism over TEPCO's handling of the crisis, Japanese Prime Minister Shinzo Abe on Thursday promised the world his government would play a greater role in stopping leaks of highly .

"The accident in Fukushima cannot be left entirely to Tokyo Electric Power. There is a need for the government to play a role with a sense of urgency, including taking measures to deal with the waste water," he said.

Abe's pledge came as the world's nuclear watchdog urged Japan to explain more clearly what is happening at Fukushima and avoid sending "confusing messages" about the disaster.

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FMA
not rated yet Sep 01, 2013
There are actually 2 simply methods that can confine the radioactive materials in the waste water.

1) use ion-exchange (IX) method; just like water softening, the IX resin should be able to adsorb the radioactive materials (as either cation or anion form) from the waste water and leave the treated water free (or significantly lower ) from radiation.

However, as the concentration of those radioactive materials increase in the IX resin, the decay of the material will give off heat that might melt the resin.

2) use zeolite to filter or adsorb the radioactive materials from the waste water, zeolite works like IX-resin and should resist the heat from the radioactive decay. The disadvantages are too bulky and less capacity the synthetic IX-resin.

In both cases, chloride and sodium ions level should maintain in lower level.