DISPOSAL OF WEAPONS PLUTONIUM
IN THE U.S. AND RUSSIA:
ISSUES AND OPTIONS FOR THE
G-8
Nuclear Control Institute
Washington, DC
At the U.S.-Russian summit this June,
Presidents Clinton and Putin agreed in principle on a framework for the disposal of 34
tonnes each of plutonium withdrawn from nuclear weapons programs. According to the U.S. Government, the agreement
(which has not yet been signed) stipulates that 25 tonnes of weapons-grade plutonium in
the U.S. and 34 tonnes of weapons-grade plutonium in Russia would be incorporated into
plutonium-uranium mixed-oxide fuel (MOX) and irradiated in existing
reactors.
The United States plans to load MOX
into four commercial pressurized-water reactors (PWRs) owned by Duke Power and located in
North and South Carolina. Russia plans to
load MOX into some combination of seven VVER-1000 reactors (four located at Balakovo, two
at Kalinin, and one at Novovoronezh), as well as the BN-600 fast breeder reactor at
Byeloyarsk and the BOR-60, a small breeder in Dimitrivograd. The MOX fuel would be substituted for a fraction
of the enriched uranium that normally fuels the reactors.
The remaining 9 tonnes of U.S. weapons plutonium would be combined with high-level
nuclear wastes after being stabilized in a ceramic matrix, through a process known as immobilization. The Russian Government considers plutonium a
valuable resource, and so far has not agreed to dispose of any weapons plutonium by means
of immobilization.
At the April 1996 summit in Moscow, the G-8 expressed their support in principle
for U.S.-Russian weapons plutonium disposition, but did not commit to provide financial or
other support for these efforts.
In their July 13, 2000 joint statement, the G-8 foreign ministers pledged to cooperate to establish multilateral arrangements necessary for a coordinated and integrated program for the safe management and disposition of weapon grade plutonium no longer required for defense purposes, and call on other states to join us in supporting this effort. However, the ministers did not make any financial commitments to pay for this effort. According to a senior Clinton Administration official, the U.S. and Russian governments hope to use the heads of state summit this week to begin to put together an international funding mechanism for plutonium disposition in Russia. Specifically, the G-8 may be asked to help finance construction of a MOX-fuel fabrication plant in Russia, with specific consideration of the export of equipment from a MOX plant that was constructed in Hanau, Germany. The Hanau MOX plant was manufactured by Siemens for Germanys nuclear-power program, but did not receive the necessary operating licenses from the German government and has never operated.
At the April 1996 nuclear safety and
security summit in Moscow, the G-8 emphasized that each state possessing fissile
material designated as no longer required for defence purposes is responsible for its
management, taking into account the need to avoid contributing to the risks of nuclear
proliferation; the need to protect the environment; the resource value of the material and
the costs and benefits involved. By
any of these criteria, MOX fuel is an undesirable plutonium disposition option.
A major international commitment to
finance MOX-fuel plutonium disposition in Russia is premature.
MOX fuel made from weapons plutonium has never been used on a commercial scale
anywhere in the world. MOX fuel made from
plutonium recovered from used nuclear-power plant fuel is used on a limited basis in
Western Europe and Japan, but the relevance of this experience to weapons-plutonium MOX is
uncertain at best. Small-scale test
irradiations of weapons-grade MOX are underway, but the results will not be known for
years. Regulatory review of the MOX program
has barely begun in either nation.
According
to a recent trade press report, the German government is not prepared to
support the export of the Hanau MOX plant to Russia, nor does Berlin support turning
Russian weapons plutonium into MOX. [NuclearFuel,
June 26, 2000] Laura Holgate, the U.S.
Department of Energy official in charge of the disposition program, stated that Russian
MOX-fuel fabrication could not begin by the planned date 2007 without the export of the
Hanau MOX plant. The design and construction
of an entirely new MOX plant could bottleneck the entire disposition program for years and
drive up costs.
Reactors do not burn up
the weapons plutonium in MOX fuel. It is misleading to speak of
"burning" weapons plutonium as if all or even most of the plutonium in MOX is
consumed during irradiation. In fact, a full core of irradiated weapons-plutonium MOX fuel
would contain only about 30 percent less plutonium than was contained in the fuel when it
was loaded into the reactor. However, even these reductions won't be achieved in practice,
because they would require reactors to be loaded entirely with MOX fuel. No light-water
reactor anywhere in the world has been operated with a 100 percent MOX core. More
realistically, a light-water reactor (LWR) loaded with a conventional one-third core of
MOX fuel would discharge only about one percent less plutonium than was contained
in the MOX fuel originally loaded. The
remaining 99 percent would remain usable in weapons if the spent MOX fuel were reprocessed
(which Russia plans to do).
MOX-fuel plutonium disposition is
extremely expensive. A
joint U.S.-Russian government study recently concluded that a MOX-fuel plutonium
disposition program for Russia would cost up to $2.5 billion. As large as this estimate is, it leaves out a
number of expenses that are likely to drive up the price tag. For example, every Russian VVER-1000 that is to
irradiate MOX as part of the plutonium disposition program should be upgraded to Western
safety standards. A European Community study
estimated that it would cost $120 to $180 million per unit to upgrade VVER-1000 reactors
to Western safety standards.
Moreover, someone will have to pay
for the continued operation of these reactors for the duration of the disposition program,
which will take more than two decades to complete. Moscow
does not have the resources to do so. Billions
of dollars may well be required to underwrite the Russian nuclear power industry so that
it can use MOX fuel. The U.S. Department of
Energy has repeatedly affirmed that MOX fuel is not economically viable in the United
States for electricity production and is only being utilized for plutonium-disposition
purposes.
Further,
a Russian MOX program would present greater risks of diversion and theft of plutonium,
primarily because of the fuel-fabrication stage, a process that is difficult to safeguard
effectively, and because of the need to transport MOX fuel long distances to reactors.
Uncertain verification could severely limit the trust nations place in an international
nuclear arms reductions and nonproliferation regime. Hijacking of a MOX transport in
Russia cannot be excluded, and weapons plutonium could be extracted from the fresh MOX
fuel by straightforward chemical processes.
It is significant to note that
safeguards and security issues related to Russias MOX program were not resolved in
the recent U.S.-Russian agreement, but are to be the subject of future negotiations, the
outcome of which is uncertain at best.
A recent report by the Nuclear
Control Institute analyzes a number of these issues.
The report calculates that in the event of a severe, Chernobyl-type accident with
containment failure or bypass, at a U.S. PWR or Russian VVER-1000 reactor with a 40% MOX
core, the number of latent cancer fatalities would be about 25% greater than for a similar
reactor with an all-uranium core. Depending
on the population density in the vicinity of the accident, this could correspond to
hundreds to thousands of additional cancer deaths.
MOX-fuel liability issues remain unresolved. A major sticking point in U.S.-Russian
negotiations has been liability in case of a MOX accident.
Nuclear firms that might provide assistance to Russias MOX program would
insist on indemnification in case of an accident. However,
neither the United States nor Russia has offered any guarantees in this regard.
Conclusion
The
United States and Russia should take the all-important first step toward plutonium
disposal of converting the metallic plutonium cores of dismantled weapons (known as
"pits") into an intermediate, unclassified oxide form. They should work
cooperatively to develop a mutually acceptable and verifiable technology for pit
conversion, and to insure secure storage of the converted material. Conversion to oxide is
required for both the MOX and immobilization approaches. Thus, this step should represent
common ground on which Russia and the United States, as well as the other G-8 nations, can
agree.
The
G-8 nations should support efforts in both the United States and Russia to dispose of
weapons plutonium directly as waste by immobilizing it with highly radioactive materials
in a vitrified glass matrix. Joint
U.S.-Russian technical analyses, as well as studies by the U.S. National Academy of
Sciences, have concluded that the immobilization approach is technically feasible and
meets the spent fuel standard of making weapons plutonium as inaccessible for
weapons use as is plutonium contained in spent fuel.
Further
information on plutonium disposition and the risks of MOX fuel are available
on the Nuclear Control Institute website at http://www.nci.org/nci-wpu.htm. The following documents provide useful
overviews: http://www.nci.org/el-russiamox.htm, http://www.nci.org/bas97.htm,
http://www.nci.org/sp31298.htm, http://www.nci.org/el62899.htm, http://www.nci.org/l122096.htm, http://www.nci.org/nci-wpu-art-nyt1.htm
The Nuclear Control Institute (NCI)
is a non-governmental organization based in Washington, DC, which focuses on the
proliferation risks of nuclear materials (plutonium and highly enriched uranium). Contact Steven Dolley, Nuclear Control Institute,
(U.S.A) phone 202-822-8444; fax 202-452-0892; e-mail dolley@nci.org
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