Officials: Buildings sinking next to Fukushima reactors — Experts: We know structures decaying, getting more unstable — ‘Plant deterioration investigation’ underway — Molten fuel thought to be eating away structural materials (VIDEO)

Published: July 29th, 2015 at 9:18 pm ET


Tepco handout (pdf), summary translation by Fukushima Diary, Jul 21, 2015 (emphasis added): Tepco announced Fukushima plant area has irregularly sunk since 311… The report reads Reactor 1 turbine building sank by 730 mm [2.40 ft], Reactor 2 by 725 mm, Reactor 3 by 710 mm, Reactor 4 by 712 mm.

IAEA Headquarters (pdf), 2015: We know that the buildings will decay and become less stable… there is the dilemma of 1) gathering more information… and 2) acting earlier and maybe not having enough information to make good decisions.

IAEA Nuclear Energy Series (pdf), 2014: The impact of the salt on the corrosion of structural materials had to be assessed and measures taken accordingly to retain integrity.

Lake Barrett, Tepco adviser (pdf): Reactor building structure has likely been degraded… Explosions Weaken RB Structure… Aftershock May Cause Building Failure — Issues: … Aftershock Structural Integrity… — Safety Challenges: … Containment Degradation

US National Research Council, 2014: Substantial structural damage occurred… particularly Units 3 and 4… The explosions [were] extremely destructive. The complex structure of the lower part of the reactor buildings is well suited to cause flame accelerationIronically, having a strong structure with multiple compartments can greatly enhance the damagethis result, although not intuitive, is now well established.

Kazuhiro Suzuki, IRID managing director (pdf), 2014: Estimation of structural strength decline by sea water inflow; Evaluating device/structural integrity and remaining life…

Sugiura Machine Design Office: We obtained results [using a] flying robot. We already have started to work on plant deterioration investigation with major manufacturer.

IRID 2014 Annual Symposium (pdf):

  • p. 94: Assessing structural integrity of RPV/PCV… data on corrosion rate will be collected… to evaluate aseismatic strength, taking into consideration long-term wall thinning by corrosion… stainless steel [components] may already be cracked
  • p. 95: Overall structural integrityBuilding behavior analysis (building damage simulation)… Influence of corrosion [and] high-temperature strength deterioration
  • p. 98: Structural integrity of PCV structures… Corrosion wall thinning… Estimated thinning of Unit 1 dry well [and] suppression chamber… Generated stress… of the suppression chamber support structures was higher [than allowable]reinforcement (such as burying the torus chamber with cement materials, etc.) will be studied
  • p. 99: Structural integrity of RPV pedestalinfluences of corrosion by molten fuel debris are not taken into account and further study is needed

Shunichi Suzuki, TEPCO, IRID 2014 Annual Symposium:

  • Part 6: “One more important point I need to cite is to assure the stability of the site… because of the presence of the ocean water, corrosion could take placepreventative measures against the corrosion need to be taken.
  • Part 85-87: “Next is assessing structural integrity of RPV and PCV [and] get qualitative data of corrosion rate. There is sea water injected so corrosion may gradually proceed… To be prepared against future possible earthquakes we have to evaluate whether this is tolerant or not… We must consider corrosion.”
  • Part 91: “PCV [integrity] is generally alright, but in some parts — for instance the column support of the suppression chamber — it [doesn’t meet standards].”
  • Part 92: “This is the pedestal of RPV… The molten debris may be causing corrosion.”

Watch Suzuki’s presentation here

Published: July 29th, 2015 at 9:18 pm ET


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  3. Experts: Fukushima is “increasingly critical due to decay of buildings… reactor blocks are sinking… alarming cracks in foundation” — “It was built very poorly, Japan cannot deal with problem alone… it’s a big problem” (VIDEO) December 19, 2013
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458 comments to Officials: Buildings sinking next to Fukushima reactors — Experts: We know structures decaying, getting more unstable — ‘Plant deterioration investigation’ underway — Molten fuel thought to be eating away structural materials (VIDEO)

  • TheNakedTruth TheNakedTruth

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    • Starbird Starbird

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  • RonM RonM

    Is there any report on the condition of the main fuel rod storage pool that has enough fuel rods to do considerably more damage than the Pacific Ocean threatening damage that has already taken place?

    Are there multiple back-up systems in place to keep the main fuel rod storage pool cooled in case of a break down?

    Though it seems as if the underground frozen wall containment of the reactor site was problematic, has it been abandoned? If so why not use the materials to build a back-up containment wall around the main fuel rod storage unit, it would be a smaller feat and might work there if it didn't work at the originally planned location?

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