Expert: Melted fuel found at Fukushima — Corium up to 6 feet thick below reactor — Nuclear waste “piling up at bottom” — Lava-like material has spread all over… “hanging like icicles” — Mystery orange substance seen (VIDEO)
ENENews,
24 July, 2017
Kyodo, Jul 22, 2017 (emphasis added)): In big step forward, Tepco finds melted fuel at bottom of reactor 3 in Fukushima… The debris was clearly identifiable to at least one nuclear expert. “The images that appear to be melted fuel debris match those found in the (1986) Chernobyl crisis,” said Tadashi Narabayashi, a specially appointed professor of nuclear engineering working at Hokkaido University. “It’s definitely fuel debris… It’s an epoch-making event.”
New
York Daily News,
Jul 22, 2017: Underwater robot
captures images of melted fuel at
wrecked Fukushima nuclear plant —
An underwater robot captured photos
of 3-foot thick lumps of melted nuclear fuel covering the floor…
Sky
News,
Jul 24, 2017: Melted
nuclear fuel spotted in Fukushima reactor —
The radioactive material has been spotted and pictured by a
submersible robot…
CNN,
Jul 24, 2017: [The robot] has revealed appears to be stalactites of
melted nuclear fuel, [Tepco] said… the robot sent back 16 hours
worth of images of massive,
lava-like fuel deposits…
AP,
Jul 23, 2017: [Images] showed massive
deposits believed to be melted nuclear fuel covering the floor…
Asahi
Shimbun,
Jul 23, 2017: Melted
nuke fuel images show struggle facing Fukushima plant—
Images captured on July 22 of
solidified nuclear fuel debris at
the bottom of a containment vessel of the crippled Fukushima No. 1
nuclear power plant show
the enormity of decommissioning of the facility…
[TEPCO] also discovered that the nuclear
fuel debris has spread throughout the containment vessel.
AP,
Jul 22, 2017: [TEPCO] said the robot found large
amounts of lava-like debris apparently
containing fuel that had flowed out of the core… TEPCO spokesman
Takahiro Kimoto said it was the first time a robot camera has
captured what is believed to be the melted fuel. “That debris has
apparently fallen from somewhere higher above. We believe it is
highly likely to be melted fuel or something mixed with it,” Kimoto
said…
Kyodo,
Jul 23, 2017: The robot was sent closer to the bottom of the reactor
on Saturday and found possible fuel
debris scattered in a wide area.
Japan
Times,
Jul 21, 2017: Fukushima
robot finds potential fuel
debris hanging like icicles in
reactor 3…
The objects spotted this time look like icicles… Tepco is pinning
its efforts on technology not yet invented to get the melted fuel out
of the reactors.
Reuters,
Jul 21, 2017: Tepco detected black-colored
material that dangled like icicles that
could be nuclear debris near the bottom of the reactor’s pressure
vessel that contained the fuel rods, the report said, citing unnamed
sources.
Bloomberg,
Jul 21, 2017: New images show what is likely to be melted
nuclear fuel hanging from
inside one of Japan’s wrecked Fukushima reactors… [Tepco]
released images on Friday showing a hardened black,
grey and orange substance…
Financial
Times,
Jul 24, 2017: [Kimoto] was reluctant
to speculate on
the nature of seemingly corroded orange patches in the images.
NHK,
Jul 23, 2017: [TEPCO] says Saturday’s probe found lumps that are
highly likely to be fuel
debris piling
up at the bottom of
the containment vessel…
The deposits are estimated to beone
to two meters thick.
Images released on Saturday show black,
rock-like lumps and what appear to be pebbles and sand accumulating
at the bottom.
From 2014
Studies show multiple fuel cores ejected from Fukushima reactors – Hot particles of uranium and plutonium fuels detected nearly 300 miles away
27
August, 2014
Marco
Kaltofen, Nuclear Science and Engineering ,
presented at Worcester Polytechnic Institute, March 19, 2014: High
Radioactivity Particles in Japanese House Dusts…
The Fukushima Dai‐ichi accident released very high activity
inhalable dust particles that travelled long distances… Airborne
dusts can transport radioactive materials as isolated individual
particles containing high concentrations of radioisotopes. Alpha and
beta emissions related to fission wastes and dispersed fuel particles
are hazardous when inhaled or ingested. Radioactively‐contaminated
environmental dusts can accumulate in indoor spaces, potentially
causing significant radiation exposures to humans via inhalation,
dermal contact, and ingestion… a micron‐scaled particle [had]
activity greater than 1.0 PBq kg [1 Quadrillion Bq/kg]. The par6cle
was collected from a home in Nagoya, Japan. Nagoya is 460 km from the
accident site… It contained both fission products and decay
products of 238U… tellurium up to 48.0 %, cesium up to 15.6 %,
rubidium up to 1.22 %, polonium up to 1.19 %, dysprosium up to 0.18
%, as well as trace amounts of Sn, lead, nickel, iron, and chromium…
226Ra, 134Cs, and 137Cs, 241Am, and 230Th [were] the most commonly
detected gamma photon-emitting isotopes… about 25 % of dusts
sampled [were] autoradiographically positive for hot particles… the
majority of these hot particles were 10 um [micrometers] or less in
size, meaning that they were potentially inhalable…
Radioactively‐hot particles on the respirable size range were
routinely detected, with one as far as 460 km [285 miles] from the
release site.
Kaltofen :
Radioisotopes in dusts released by Fukushima Daiichi units [include]
Uranium and plutonium fuels and transuranics such as americium and
neptunium… individual radioactive particles [in an] Ibaraki dust
sample [include] Eu, Y, Zr, Th, Ce, Sr… in 1 to 15 um size range…
Kaltofen :
The Japanese samples came from as far north as Sapporo in Hokkaido
Prefecture and as far south as Tokyo, a range of 780 km. Fifty nine
samples of dust from Japan were analyzed… Radioisotopes specific to
the Fukushima Daiichi accidents, including Cs134, Cs137, and Co60
were detected in dust samples taken throughout Northern Japan,
including areas more than 200 km outside of the accident exclusion
zone. Cs134 was detected at all of the Japanese sites tested…
Japanese samples… analyzed in the first month after the accident
also contained I131 and Am241… Radioactive dust has become a
ubiquitous part of life in northern Japan.
Source:
(pdf)
: http://www.indymedia.ie/attachments/mar2014/kaltofenjp_measuringradioactivedustinnorthernjapan.pdf
Chris
Harris, former licensed Senior Reactor Operator & engineer,
Aug 21, 2014 (at
24:00 in):
NHK just [broadcasted] that many studies are showing… that multiple
cores — parts of it, or some, or even most of it — had been
ejected. We thought that too. Once you breach containment, that was
one of my big concerns — where did the core go after an explosion
like? Whether it be steam or hydrogen explosion or a combination of
both… it got ‘sneezed out’ all over the place. It’s totally –
it’s a huge mess.
Source:
(video interview
with Harris here)
: https://www.youtube.com/watch?feature=player_detailpage&v=tQ5hmieRTpQ#t=1438
Source:
Enenews
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