The 12th International Conference on Environmental ... - Events

Abstracts Session 22
<strong>The</strong> powder type organic scintillator was mixed with the optically transparent epoxy resin until the powder was completely wet
and uniformly distributed throughout the liquid. <strong>The</strong> mixture was then poured into a polyethylene mold and cure into a bulk type.
<strong>The</strong> used organic scintillator was 2,5-diphenyloxazde (PPO) as a first solute and 1,4-bis[5-phenyl-2-oxazol]benzene (POPOP) as a
second solute which was a wave shifter. Also, the inorganic scintillator ZnS(Ag) was used for measuring the alpha particles. <strong>The</strong>
powder type ZnS(Ag) was mixed with the epoxy resin, and then solidified.
For remote measurement the optical fiber was used. <strong>The</strong> scintillation light produced by interaction with the radiation and scintillator
was transmitted through an optical fiber to the photon counter that is placed in the high-level radiation area outside. <strong>The</strong>
optical fiber was inserted into the radiation sensor before solidification of the epoxy resin, and then solidified. <strong>The</strong> remote radiation
sensor was the one-body type with the scintillation detector and the optical fiber. <strong>The</strong> ability of the radiation detection and the
signal transmission were tested.
I) ALGORITHMISATION OF DISMANTLING TECHNIQUES IN
STANDARDISED DECOMMISSIONING COSTING - 16201
Peter Bezak, DECOM, a.s. (Slovakia); Vladimír Daniaka,Deconta, a.s.(Slovakia);
Ivan Rehak, Decom, a.s. (Slovakia); Vladimir Necas, Slovak University of Technology in Bratislava(Slovakia)
Recently developed computer code OMEGA for evaluation and optimisation of decommissioning options implements the standardised
cost structure (IAEA, OECD/NEA, EC, 1999) as the universal structure [PSL] for calculation and optimisation of decommissioning
scenarios. One of the groups of decommissioning activities is the dismantling of systems and structures. <strong>The</strong>se activities
variously depend on the complexity of dismantled systems, e.g. reactors, equipment of the primary systems or standard components
like pipes, valves, motors, tanks etc. Type and extent of decommissioning activities depends also on local conditions for
dismantling like dose rate, decommissioning equipment category, local working conditions, etc. <strong>The</strong>se factors determine the selection
of techniques for dismantling, depending on material and radiological status of the equipment (type of technique and their manual
or remote application). This approach enables proper planning and performing of individual decommissioning phases.
J) THERMAL CUTTING TECHNOLOGIES FOR DECOMMISSIONING OF NUCLEAR FACILITIES - 16297
Harald Bienia, NUKEM Technologies GmbH (Germany)
Remote disassembly of radiologically burdened large components is among the most sophisticated and complex activities in
the dismantling of nuclear installations. High local dose rates and contamination levels, combined with complicated designs and
geometries of the object to be dismantled, plus insufficient accessibility, imply major challenges in the dismantling of nuclear facilities.
Usually the shielding effect of water is used during the dismantling period. Other dismantling activities require dry ambiences.
<strong>The</strong> required space for the technical equipment during the dismantling operations, especially for the removal of larger components
(e.g. reactor pressure vessel, heat exchanger, etc.) is often an additional problem. Conventional cutting technologies like sawing
with a disk saw or band saw require large and heavy frameworks as well as guiding systems with high rigidity. <strong>The</strong>se solutions
are expensive and sometimes not applicable.
Additionally these technical questions, the estimated costs of the used dismantling technologies are important for choosing the
best cutting technology. <strong>The</strong> three cutting technologies Autogenous Flame Cutting, Plasma Arc Cutting and Contact Arc Metal Cutting
are proven tools for dismantling tasks and will be introduced.
K) INVOLVEMENT OF ANDRAD IN ENDORSEMENT OF DECOMMISSIONING
DOCUMENTATION OF NUCLEAR FACILITIES IN ROMANIA - 16315
Marin Dinca, National Agency for Radioactive Waste (Romania)
National Agency for Radioactive Waste ANDRAD is in Romania, by law, the competent authority for the disposal administration
of spent nuclear fuel and radioactive waste and for the coordination of the predisposal management of spent nuclear fuel and
radioactive waste, inclusive decommissioning of nuclear facilities.
Government Ordinance (GO) No. 11/January 30, 2003 and Government Decision (GD) No. 1601/December 23, 2003 established
the ANDRAD’s foundation and organization.
In accordance with GO No. 11/2003, republished, on the safe management of the radioactive waste, ANDRAD has the responsibility
to endorse the decommissioning documentation issued by the main radioactive waste generators (nuclear installations and
other major radiological installations: radioactive waste treatment plants, radioactive waste storage facilities, post irradiation examination
laboratories, centres for radioisotopes production etc.).
ANDRAD receives for endorsement some of the documentation for decommissioning that is provided by enforced norms for
each type of nuclear facility.
<strong>The</strong>re are presented the nuclear facilities that must have decommissioning documentation endorsed by ANDRAD, the type of
documents submitted by license holder to ANDRAD and the procedure of endorsement in relation with the regulatory body
(CNCAN) approval of the decommissioning documents.
L) VISUALIZATION OF RADIOACTIVE SOURCES WITHOUT
GAMMA-RADIATION WITH UV IMAGING SYSTEMS - 16145
Oleg Ivanov, Alexey Danilovich, Vyacheslav Stepanov, SergeySmirnov, RRC Kurchatov Institute (Russia);
Anatoly Volkovich, Russian Research Center “Kurchatov Institute”, (Russia)
New UV cameras are suitable for imaging of α-contamination by fluorescence of atmospheric air the near ultraviolet (wavelength
– 280 – 390 nm) region.<strong>The</strong>ir parameters are: FOV for detecting in UV spectral region is 8” x 6”. <strong>The</strong> optical FOV is about
48” x 36” . DayCor SUPERB UV camera has sensitivity 3x10-18 W/cm2 enables detection and displaying corona emission as weak
as 1.5 pC at distance 8 m, and capture moving targets without smearing the output image. Instruments sensitivity for alpha contamination
registration in terms of minimum measurable activities (MMA) have been estimated as, 40 – 100 Bq/cm2 (measurement
time is 3600 – 600 sec correspondently).
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