[ RadSafe ] Fwd: [New post] Fukushima molten nuclear fuel cores causing "Risk of re-criticallity"

Roger Helbig rwhelbig at gmail.com
Sat Mar 22 04:44:02 CDT 2014

ENENews needs to be shut down for putting out this kind of scare the
world speculation - I would presume that there is ZERO chance of this
happening, but it makes great anti-nuclear propaganda - probably will
be picked up by the ambulance chasers representing the sailors that
they have duped into believing that they are sick due to Fukushima.

Roger Helbig

---------- Forwarded message ----------
From: nuclear-news <comment-reply at wordpress.com>
Date: Fri, Mar 21, 2014 at 8:52 PM
Subject: [New post] Fukushima molten nuclear fuel cores causing "Risk
of re-criticallity"
To: rwhelbig at gmail.com

Christina MacPherson posted: "Japanese TV: Fukushima fuel cores have
'molten-through' containment vessels -- Location of molten fuels is
unknown -- "Risk of re-criticallity" from filling vessels with water
Respond to this post by replying above this line

New post on nuclear-news

Fukushima molten nuclear fuel cores causing "Risk of re-criticallity"

by Christina MacPherson

Japanese TV: Fukushima fuel cores have 'molten-through' containment
vessels -- Location of molten fuels is unknown -- "Risk of
re-criticallity" from filling vessels with water

Email update from Genn Saji, former Secretariat of Japan's Nuclear
Safety Commission, Mar. 10, 2014 (emphasis added):

On February 26, NHK released (Japanese only) a news on their overall
view on un-dissolved nub parts of the Fukushima Daiichi nuclear
accident. The identified issues are categorized in the following four

De-fueling of "molten" core debris should start six years from now in
the earliest -- The core-meltdown has occurred in 1F1 through 1F3,
resulting in penetration of the molten high temperature nuclear fuels
through the RPV (Reactor Pressure Vessel) and leached at the bottom of
the PCV (Primary Containment Vessel) in the Fukushima Daiichi
accident.  According to TEPCO's schedule, the de-fueling should start
in 2020 in the earliest.  The overall decommissioning should be
completed in a time span of 30-40 years.
Exact damage location of PCVs have not been identified -- In attempting
the above task, there is an urgent issue waiting for early solution.
First of all, the exact damage locations of the PCVs where the fuel
have molten-through has not been identified yet.  TEPCO plans to fill
the PCVs with water to shield against radiation [...]
The molten fuels have not been characterized -- Next issue is
whereabout and characteristics of the molten fuels are not know.
Without resolving these issues, it is not possible to establish the
necessary approaches for de-fueling.  In addition, there exists a risk
of re-criticallity upon filling the PCV with water.  The contaminated
water is hindering human access for inspection with high radiation
field and hazardous radioactive species.  The Japanese Government and
TEPCO are rushing for R&D of robots as well as theoretical predictions
trying to grasp accurate status of nuclear fuels.
Searching for way out of contaminated water issues -- Fundamental
solutions are waited for the contaminated water issues which are
generated through cooling of nuclear fuels.  The contaminated water
accumulated at the basements of buildings through leakage from PCVs.
Its volume continue increasing, and a part of the water was found
leaked unnoticed last year. [...] leak path has not been identified

I believe NHK failed to identify two of the most important and serious
issues among the consequences of Fukushima nuclear accident [...]
[one] issue is the root case of hydrogen explosion.  NHK simply
followed TEPCO's scenario of zirconium-steam reaction. [...]
(More to come about Saji's view on the root cause of the explosions)

Christina MacPherson | March 22, 2014 at 3:52 am | URL: http://wp.me/phgse-gPa

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