IS LYNAS’ HANDLING OF RADIOACTIVE WASTES SATISFACTORY?
Say radiation and the image of contorted
babies with missing or extra limbs come to mind — not a pretty picture.
Though radiation has plenty of safe
practical uses as well — think x-rays, sterilisation of medical equipment,
smoke detectors and even food irradiation — “radioactive exposure” connotes
Fukushima horrors before all else.
Thus, it is understandable that when
Australian Lynas Corp set up a rare earth refinery on our shores where it will
use radioactive feedstock and generate tonnes of radioactive waste, many were
alarmed and protests swiftly followed.
Today, many still find Lynas’ solution
for its radioactive wastes unsatisfactory.
HOW DANGEROUS ARE THESE WASTES?
Based
on Lynas’ its Radioactive Waste Management Plan (RWMP) submitted on 30 December
2011, every tonne of rare earth oxide it produces will be an accompanied by
13.41 tonnes of solid residues — 7.93 tonnes Neutralisation Underflow Residue
(NUF), 2.63 tonnes Flue Gas Desulfurisation (FGD) and 2.85 tonnes Water Leached
Purification Residue (WLP).
After
the visit by the International Atomic Energy Agency (IAEA) Review team in 2014,
the NUF and FGD with radioactivity below 1 Bq/g were dropped from the
regulatory control of Atomic Energy Licensing Board of Malaysia (AELB). They
were classified as clear waste and placed under the Department of Environment’s
(DOE) purview.
The
worrisome residue it WLP, which has a radioactivity of 7.98 Bq/g. In 2014, an
experiment to extract the radioactive Thorium from WLP conducted by Universiti
Kebangsaan Malaysia (UKM) proved to be non-viable. However, the experiment
revealed that the radioactivity of WLP was much higher than that declared
earlier by Lynas.
Lynas’
website says: “Our residues are not wastes – they have tremendous potential as
safe commercial products”. In its RWMP, Lynas had proposed to recycle all its
solid wastes into industrial by-products. It even had an impressive timeline of
R&D and commercialisation over 2012-2015. Key products/applications
included plaster board and cement manufacturing, road base, fertilizers, and
soil remediation. In fact, Lynas had in many occasions said there would be
little need for a permanent deposit facility (PDF) for its wastes as they would
all be recycled!
To date, nothing has been commercialised.
Lynas still appears to be struggling to find a solution for its fast-growing
solid residues. It all boils down to a single product, a soil enhancer called
CondiSoil, for which it received SIRIM’s seal of approval last year.
However, the proposed mixture of 1:2:7 of
WLP: NUF: FGD will leave behind large quantities of unused radioactive WLP for
lack of FGD to go with it to create CondiSoil — using all the FGD to make
CondiSoil would only use up 13.18% of WLP. This begs the question of what Lynas
intends to do with the remaining 86.82% of its radioactive WLP? A PDF would be
needed to safely store it, no?
One also can’t help but wonder if the
ratio was such as to enable the WLP to be watered down to under 1 Bq/gm so that
it will no longer be considered radioactive by AELB. Recycling of radioactive
wastes through dilution is never allowed or practiced anywhere else in the
world!
Moreover, to entrust and seek approval
from SIRIM on Condisoil’s safe usage is totally misplaced. SIRIM is the body
that appraises and evaluates proposed industrial standards drafted by relevant
professional bodies before they become Malaysian Standards. Does the SIRIM
approval mean CondiSoil would become the Malaysian Standard for recycled
radioactive wastes? Would this set a precedent among other industries churning
out radioactive wastes to also “mix” their radioactive wastes, give it a fancy
name and pass it off as a safe recycled industrial by-product?
