Reuters: Corrosion is weakening Unit No. 4 at Fukushima — Concern quake to ‘topple’ bulging structure — “May have tilted” — Holds 14,000 Hiroshima bombs worth of cesium-137
August 14th, 2013
Title: Insight: After disaster, the deadliest part of Japan’s nuclear clean-up
Author: Aaron Sheldrick and Antoni Slodkowski
Date: Aug 14, 2013
[...] “If you calculate the amount of cesium 137 in the pool, the amount is equivalent to 14,000 Hiroshima atomic bombs,” said Hiroaki Koide, assistant professor at Kyoto University Research Reactor Institute. [...]
Tepco has shored up the building, which may have tilted and was bulging after the explosion, a source of global concern that has been raised in the U.S. Congress.
The utility says the building can withstand shaking similar to the quake in 2011 [...] but the company has a credibility problem. [...]
Corrosion from the salt water will have also weakened the building and equipment, [Murray Jennex, an associate professor at San Diego State University who is an expert on nuclear containment and worked at the San Onofre nuclear plant in California] said.
And if an another strong earthquake strikes before the fuel is fully removed that topples the building or punctures the pool and allow the water to drain, a spent fuel fire releasing more radiation than during the initial disaster is possible, threatening about Tokyo 200 kilometers (125 miles) away.