ICEM11 Final Program 9.7.11pm_ICEM07 Final Program ... - Events

Abstracts Session 16
SESSION 16 — NATIONAL AND INTERNATIONAL D&D PROGRAMS (3.3)
1) PARTICULARITIES OF CHNPP SITE REMEDIATION DURING ITS DECOMMISSIONING (wP-59193)
Sergii Mitichkin, Valeriy Seyda, Chernobyl NPP (Ukraine)
On April 26, 1986 beyond designed accident occurred at Chernobyl NPPs Unit 4 as a result of which the reactor core and protective
safety barriers have been destroyed. Releases of fission products are evaluated approximately in 50 MKu (without considering
inert radioactive gases) that makes approximately 3,5 % of total quantity of the radio nuclides accumulated in the reactor as
of the moment of accident.
To liquidate the accident consequences it has been constructed the Shelter object. The major part of fission nuclear materials
is localized within the Shelter object in the form of separate elements of fuel assemblies and congestions of Fuel Containing Materials.
The de?ontamination works carried out in 1986, have allowed to clean up ChNPP site from a main part of radioactive substances.
That has provided a possibility to operate ChNPP site equipment without the excess of a dose limit established in normative
documents. But a significant amount of reactor core fragments (according to some estimations - from 500 kg up to 1000 kg)
remains at ChNPP territory under a concrete and ground layer, laid in 1986 with the purpose to reduce radiation conditions parameters
at the site up to the normative documents requirements. The given circumstance
2) DIVISION OF NUCLEAR LIABILITIES BETWEEN DIFFERENT LICENSE HOLDERS AND OWNERS (wP-59214)
Staffan Lindskog, Swedísh Radiation Safety Authority; Rolf Sjöblom, Tekedo AB (Sweden)
Operation of nuclear facilities typically implies that substantial liabilities for decommissioning and waste management are
incurred. In the case of Sweden, and in accordance with the polluter pays principle, money is collected into segregated funds and
securities are provided to ensure that adequate funding will be available at the time when it is needed. For nuclear power plants,
the safeguarding of funds includes the estimated costs as well as an amount related to the risk that the Government takes as the ultimate
guardian of the system.
For other license holders, the fees and securities must include only the estimated cost. For old facilities, special problems may
arise since they might no longer generate any revenue. Another problem with old facilities is that it has been proven difficult, in
many cases, to obtain sufficiently precise cost calculations. There issues have been dealt with in previous presentations to the ICEM
by the present authors.
However, equally important - but so far largely neglected - is the issue of who is actually responsible for what. Of course, our
Environmental Code - as does the corresponding legislation in many other countries - states that the responsibility is a collective
one, and anyone involved can…
3) SPANISH APPROACH TO LARGE DECOMMISSIONING PROJECTS (wP-59320)
Juan Santiago, Alejandro Rodríguez, ENRESA (Spain)
Spain has accumulated significant experience in the field of decommissioning of nuclear and radioactive facilities. Relevant
projects include the decommissioning of research reactors and nuclear research facilities and the decommissioning of gas-graphite
and light water nuclear power plants. The decommissioning of nuclear facilities in Spain is undertaken by ENRESA, who is also
responsible for the management of radioactive wastes. The three most notable projects are the decommissioning of the Vandellós I
nuclear power plant, the decommissioning of the CIEMAT Nuclear Research Centre and the decommissioning of the José Cabrera
nuclear power plant.
The Vandellós I gas-graphite reactor was decommissioned in about five years (from 1998 to 2003) to what it is known as level
2. During this period, most plant systems and components were dismantled, the reactor vessel was confined and the facility was
prepared for latency. In 2005 the facility entered into a dormancy phase, with minimum operating requirements.
The decommissioning of the CIEMAT Research Center includes the dismantling of obsolete facilities, such as the research
reactor JEN-1, a pilot reprocessing plant, and a conditioning and storage liquid waste facility and the remediation of contaminated
soils. Dismantling works started in 2006 and have been completed by 2010.
In March…
4) DECOMMISSIONING OF OBSOLETE NUCLEAR FACILITIES IN THE
NUCLEAR RESEARCH INSTITUTE REZ (wP-59309)
Josef Podlaha, Karel Svoboda, Nuclear Research Institute Rez; Eduard Hanslik,
T.G.M. Water Research Institute (Czech Republic)
After more than 55 years of activities of the Nuclear Research Institute Rez (NRI) in the nuclear field, there are some obsolete
nuclear facilities that shall be decommissioned.
NRI is a leading institution in all areas of nuclear R&D in the Czech Republic. NRI has had a dominant position in the nuclear
programme since it was established in 1955 as a state-owned research organization and it has developed to its current status. In
December 1992, NRI has been transformed into a joint-stock company.
The Institute’s activity encompasses nuclear physics, chemistry, nuclear power, experiments at the research reactor and many
other topics. Main issues addressed in NRI in the past decades were concentrated on research, development and services provided
to the nuclear power plants operating VVER reactors, development of chemical technologies for fuel cycle and irradiation services
to research and development in the industrial sector, agriculture, food processing and medicine.
The NRI operates two research nuclear reactors, many facilities as a hot cell facility, research laboratories, technology for
radioactive waste (RAW) management, radionuclide irradiators, an electron accelerator, etc.
The obsolete facilities to be decommissioned comprise:
(1) Various research facilities
Hot cells used for research in the field of reprocessing of…
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