By Robert Alvarez
The radioactive inventory of all the irradiated nuclear fuel stored in spent fuel pools at Fukushima is far greater and even more problematic than the molten cores.
As more information is made available, we now know that the Fukushima Dai-Ichi site is storing 10,833 spent fuel assemblies (SNF) containing roughly 327 million curies of long-lived radioactivity About 132 million curies is cesium-137 or nearly 85 times the amount estimated to have been released at Chernobyl.
The stark reality, if TEPCO’s plan is realized, is that nearly all of the spent fuel at the Da-Ichi containing some of the largest concentrations of radioactivity on the planet will remain indefinitely in vulnerable pools. TEPCO wants to store the spent fuel from the damaged reactors in the common pool, and only to resort to dry, cask storage when the common pool’s capacity is exceeded. At this time, the common pool is at 80 percent storage capacity and will require removal of SNF to make room. TEPCO’s plan is to minimize dry cask storage as much as possible and to rely indefinitely on vulnerable pool storage. Senator Wyden finds that TEPCO’s plan for remediation carries extraordinary and continuing risk. He sensibly recommends that retrieval of spent fuel in existing on-site spent fuel pools to safer storage in dry casks should be a priority.