[Mariner]

Problem is, he doesn't know the model of reactor in question.

The GE BWR-1 at Fukashima does not have a 3rd containment vessel like we had at TMI.

[Errant]

The GE BWR-1 at Fukashima does not have a 3rd containment vessel like we had at TMI.

I caught that from the diagrams shown.

Thanks,

[sefarkas]

GE BWR-1 at Fukashima

BWRs come in flavors from BWR-2 (Nine Mile, Oyster Creek) to BWR-6 like Grand Gulf. Those BWR models are housed in containments that come in three flavors, Mark I (like Fukushima Daiichi No. 1), Mark II (like Limerick), and Mark III (like Grand Gulf). Containment is achieved via the fuel rods, the reactor vessel, and the containment vessel. The term "3rd containment" is not used in the industry.

[Qbert]

“Problem is, he doesn’t know the model of reactor in question.
The GE BWR-1 at Fukashima...”

—This isn’t correct. Fukushima reactors are all BWR-3 and higher:

http://www-pub.iaea.org/MTCD/publications/PDF/CNPP2010_CD/pages/AnnexII/tables/table2.htm