Gundersen: Damage to Fukushima Unit 3 fuel racks could be from prompt moderated criticality, not objects falling in pool — What does Tepco know that they haven’t yet shown photos of?
Regarding Tepco’s recent statement that the fuel assemblies in the Unit 3 pool could have been damaged by shock when the steel beams or 30-ton fuel exchanger fell, Fairewind’s chief engineer Arnie Gundersen writes in to ENENews:
Another possible reason for damaged U3 racks could be a prompt, moderated criticality. What does TEPCO know about the U3 racks that they have not yet shown photos of? The photos I have seen are very murky, very blurry. I wonder if TEPCO has better quality pictures?
See also: Nuclear expert: Powerful explosion at reactor No. 3 may have been from "prompt criticality" in spent fuel pool (VIDEO)
- Asahi: New photos show extensive damage at No. 3 fuel pool — 35-ton machine that appears to be on fuel racks is a crane April 14, 2012
- New images of Unit 3 fuel pool show debris near surface, possibly in danger of falling inside — Tepco investigating “condition of steel members partially immersed in pool” (PHOTOS) September 13, 2012
- Kyodo: Steel beam removed from Fukushima plant’s No. 3 pool after falling on fuel racks — Another steel beam found soon after (PHOTOS) December 20, 2012
- Gundersen: White haze in photo of Unit 3 is coming from spent fuel pool — Almost as dangerous as Unit 4 (PHOTOS) July 12, 2012
- Japan TV: Steel beam found next to fuel rod assemblies in Fukushima fuel pool — Tepco raises possibility of damage (VIDEO) September 25, 2012