Friday, October 19, 2012

Bent Water Rod in Spent Fuel at TEPCO's Kashiwazaki-Kariwa Nuke Plant, No One Knows Why or How

Engineers, care to comment?

During the regular maintenance, TEPCO found a bent water rod in one of the spent fuel assemblies in the Reactor 5 Spent Fuel Pool at Kashiwazaki-Kariwa. In another assembly, the company found a bit of cotton-like fiber caught in the spacer.

From TEPCO's press release (Japanese) on October 17, 2012:


Fuel rod configuration, from "Nuclide Composition and Neutron Multiplication Factor
of BWR Spent Fuel Assembly
", Japan Atomic Energy Research Institute (November 1999):


Anonymous said...

I blame jellyfish!

Anonymous said...

Were they trying to get a dropped piece of equipment out? One Reactor had a large machine dropped into it(by accident) this the end result of a removal attempt of something similar?

Anonymous said...

@9:35 the boys at Monju managed to drop a large crane into the reactor (!), maybe this is what you are recalling?

arevamirpal::laprimavera said...

Fuku-I's Reactor 3 SFP has a part of the crane in it. The above is TEPCO's nuke plant in Niigata Prefecture, not without continuous problems.

Atomfritz said...

Highly interesting.

Local overheating probably isn't the cause, as fuel tube cladding would also have been observed then.

Was it an undetected production mistake that got unnoticed because of the widespread custom of not thoroughly testing but just fill in some random data into the QA sheets?

Atomfritz said...

oops, I forgot a word: fuel cladding _damage_

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