Locations for disposal of nuclear fuel lacking
Sep 24 - McClatchy-Tribune Regional News - Koichi Yasuda and Takashi
Hagihara The Yomiuri Shimbun
Methods and locations for the disposal of nuclear fuel remain unclear
as the government maintains a directionless course over its nuclear
policy, which is full of inconsistencies on eliminating nuclear power by
the 2030s.
The government has mapped out its nuclear policy in a document on
"innovative energy and environmental strategy," but it failed to clarify
how spent nuclear fuel from power plants is to be disposed of.
The strategy referred to beginning research on burying spent fuel
underground as a final disposal measure, but at the same time, said a
project to reprocess spent fuel will continue.
Finding final disposal sites is certain to become more difficult as
public distrust of nuclear power has been growing following the crisis
at the Fukushima No. 1 nuclear power plant.
"It's impossible to win residents' understanding," said an official
of the Nuclear Waste Management Organization (NUMO) after he learned the
government called for research into burying the fuel in its new energy
policy. The main pillar of the policy is zero dependence on nuclear
power.
NUMO, a private organization, has been trying to find final disposal
sites for spent fuel.
Currently, all spent fuel from nuclear power plants is reprocessed
and plutonium and uranium are extracted from the fuel and recycled as
plutonium-uranium mixed oxide (MOX) fuel.
The remaining highly radioactive waste is to be vitrified and
permanently buried 300 meters or deeper underground.
The government also included in the current plan an option to dispose
of spent fuel by directly burying it underground in anticipation of the
future zero nuclear target.
However, if research to bury the fuel underground begins, this will
surely increase the hurdles in finding final disposal sites.
If nuclear waste is buried before being reprocessed, the volume is
expected to be about three times that of reprocessed waste, making it
more difficult to secure disposal sites.
"There aren't many technical problems. The thing that's difficult is
addressing the unease of residents who worry that recriticality may
occur as [the waste] contains plutonium and other things," said Osamu
Tochiyama, director general of Nuclear Safety Research Association's
Radioactive Waste Disposal Safety Research Center.
In 2002, the government and NUMO said buried vitrified waste would
not affect the environment although it would take several tens of
thousands of years until radiation would reach natural levels.
That year, they started searching for potential final disposal sites.
But the only local government that applied to be the site was Toyo,
Kochi Prefecture. The town later rescinded its application and there has
been no further progress on the issue.
"There has been no research to directly bury spent fuel underground,
and it will take time to establish the technology. It's almost certain
there will be more delays in finding sites," a NUMO official said.
Under the circumstances, a proposal submitted by the Science Council
of Japan on Sept. 11 created a stir as it proposed new measures to
dispose of spent fuel.
The proposal differs greatly from the current government plan, noting
that it is difficult to anticipate the long-term stability of the
Earth's strata.
"[We propose] temporarily storing spent fuel in a way that makes it
possible to retrieve after several decades or hundreds of years. During
that time we can study the stability of strata. We can also study
appropriate measures to dispose of the fuel and look into ways to lower
the risk of radioactive substances," the proposal said.
The council opted for temporary storage as it wants to find a
solution by proceeding to discussions over the deadlocked nuclear waste
disposal issue.
The council made this move as it feared there will be no space to
store spent fuel that has been piling up toward the capacity of spent
fuel pools at nuclear power plants.
If every nuclear reactor restarted operations, the pools are expected
to reach capacity in an average of six years. The pools at the Tokai No.
2 nuclear power plant in Ibaraki Prefecture, the Kashiwazaki-Kariwa
nuclear power plant in Niigata Prefecture and the Genkai nuclear power
plant in Saga Prefecture are expected to reach capacity in about three
years.
NUMO is perplexed by the council's proposal.
"The technology to safely bury [spent fuel] underground for several
tens of thousands of years has been established. [We're embarrassed] to
hear a proposal reversing the initial plan," a NUMO official said.
The Japan Atomic Energy Commission under the Cabinet Office, which
asked the council to draw up a proposal, is also unsure how to handle
the council's proposal.
Meanwhile, the government is looking to abolish and reorganize the
commission that set the basic atomic energy policies.
The government's strategy and its many inconsistencies will cast
further uncertainty over types and amounts of nuclear waste, adding
another layer of confusion.
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