The water leaked (for nth time) somewhere in the contaminated water treatment system at Fukushima I Nuke Plant. This time, what’s notable is not that the system leaked but the density of radioactive materials in that leaked water. I’m surprised TEPCO actually announced the numbers:
- Cesium-134: 5.5 million becquerels/cubic centimeter
- Cesium-137: 6.27 million becquerels/cubic centimeter
They are much, much higher than the numbers below that TEPCO last announced (July 15) as the densities of radioactive materials in the water before the treatment:
- Cesium-134: 1,500,000 becquerels/cubic centimeter (1.5 x 10^6)
- Cesium-137: 1,700,000 becquerels/cubic centimeter (1.7 x 10^6)
So, in the 700 liters of water that leaked, there are:
- Cesium-134: 5.5 million x 1000 x 700 = 3,850,000,000,000 or 3.85 terabecquerels
- Cesium-137: 6.27 million x 1000 x 700 = 4,389,000,000,000 or 4.389 terabequerels
From Yomiuri Shinbun (1:04AM JST 8/6/2011):
TEPCO announced on August 5 that 700 liters of highly contaminated water was found leaking from the hose inside the Central Waste Processing Facility at Fukushima I Nuclear power Plant.
There was no effect on the environment outside the building. TEPCO hadn’t tested the density of the contaminated water [at that location?] until the leak was found. It again raises the question of the effectiveness of TEPCO’s safety measures.
According to TEPCO, the leak was found at the hose that routes the water used to flush the vessels [Kurion’s system] back into the treatment system. Cesium-134 was detected at 5,500,000 becquerels/cubic centimeter, and cesium-137 was found at 6,270,000 becquerels/cubic centimeter. The level of cesium is about the same as that of the contaminated water in the basements of the turbine buildings at Reactors 3 and 4.
What? That’s the level of contamination in the water in Reactors 3 and 4? That’s news to me also. Water in the basements of Reactors 1 and 2 is considered even more radioactive.