Records shattered’ at Fukushima — Radiation levels surge after typhoon — Tepco “doesn’t know why” th

[bananas]

16. This article? Correctly references an NRC document.

Last edited Mon Oct 13, 2014, 07:58 AM - Edit history (1)

Accurately quotes an official document on the NRC website: http://pbadupws.nrc.gov/docs/ML0210/ML021080117.pdf
- "There are two basic types of meltthrough to consider."
- "First is the possibility of basemat meltthrough (the China Syndrome)"
- "The second type of meltthrough ... can lead to more serious consequences"

So the headline is correct.

http://enenews.com/govt-analysis-fukushima-serious-china-syndrome-worst-type-containment-failure-all-3-reactors

US gov’t analysis says Fukushima is more serious than ‘China Syndrome’ — Destroyed reactors suffered worst type of containment failure (PHOTOS)

Published: October 8th, 2014 at 8:35 am ET
By ENENews

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NRC on Containment Failure Due to Drywell Shell Melt-through (pdf): There are two basic types of meltthrough to consider. First is the possibility of basemat meltthrough (the China Syndrome)… This failure mode is not generally catastrophic, because of the long time available for emergency response actions and the possibility of some retention in the soil. The second type of meltthrough is most applicable to Mark I BWR containments [All 3 Fukushima reactors used Mark I boiling water reactor containments]. In this case, molten material can exit the area beneath the reactor and flow across the floor, directly contacting the steel liner and causing it to fail. This type of failure… can happen much more quickly than basemat meltthrough and can lead to more serious consequences… A phenomenon of importance primarily for Mark I BWRs is shell (liner) meltthrough… The Mark I drywell floor area is small and the drywell shell is within ten feet of the pedestal doorway…

<snip>