The 13th International Conference on Environmental ... - Events

Abstracts
specimens were welded to the body plates without pre- and post-weld heat treatment by using a remote automated
welding machine. <strong>The</strong> drop tests showed that no penetration cracks or splash of its content occurred in the disposal
container under conservative conditions such as the maximum weight and height in the handling. Drop analysis and the
fracture mechanics assessment indicate that the strain induced by the drop impact did not exceed the fracture strain and
an unstable fracture did not occur. And macroscopic tests showed that penetration cracks did not occur at 8m drop events.
<strong>The</strong>se tests and evaluations confirmed that the disposal container had sufficient toughness.
SESSION L5: Recycling and Clearance
1)� 40223 – NPP Bulk Equipment Dismantling Problems and Experience
Alexander B.Gelbutovsky, Eugeny V. Balushkin, Jury A. Epikhin,
Alexander V. Troshev, Peter I. Cheremisin, ECOMET-S JSC (Russia)
NPP bulk equipment dismantling problems and experience are summarized. “ECOMET-S” JSC is shown as one of
the companies which are able to make NPPs industrial sites free from stored bulk equipment with its further utilization.
“ECOMET-S” JSC is the Russian Federation sole specialized metallic LLW (MLLW) treatment and utilization facility.
Company/s main objectives are waste predisposal volume reduction and treatment for the unrestricted release as a scrap.
Leningrad NPP decommissioned main pumps and moisture separators / steam super heaters dismantling results are
presented. Prospective fragmentation technologies (diamond and electro-erosive cutting) testing results are described.
<strong>The</strong> electro-erosive cutting machine designed by “ECOMET-S” JSC is presented. <strong>The</strong> fragmentation technologies
implementation plans for nuclear industry are presented too. Key words: cutting, fragmentation, NPP bulk equipment,
recycling, utilization, main pump casing, gas cutting, melting, metal ingots, unrestricted use, separator, steam super
heater, air plasma cutting machine, diamond cutting, electro erosive cutting, electro-erosive cutting machine.
2)� 40073 – Reuse Of Conditionally Released Radioactive Materials From NPP Decommissioning Applied In
Motorway Bridges Construction
Michal Panik, Tomas Hrncir, Vladimir Necas, Slovak University of Technology in Bratislava (Slovakia)
During the operation and especially during decommissioning of nuclear installation is produced considerable
amount of solid materials (metals, non-metals, building structures) that can fix radioactivity in forms of contamination or
activation. <strong>The</strong> materials present radioactive waste, part of radioactive waste may just slightly exceed limits for
unconditional release of materials into the environment. On the other side, there is possible, after proving of defined
safety limits fulfillment, to conditionally release radioactive waste for special purpose. In opposite case it would be
inevitable to dispose radioactive waste in radioactive waste repository. Approaches of different countries to release of
materials vary and the extent of this issue processing is related to each approach. Requirements set down in Slovak
Republic legislation are given in the paper. Before the conditional release of materials there must be done consistent
analysis of the materials impact on the inhabitants and the environment in short and long time period. <strong>The</strong> analysis
comprises the evaluation of considered scenarios of specific utilization of conditionally released materials. This analysis
necessarily precedes the realization of utilization. Scenarios describing utilization of radioactive waste carbon steel in the
motorway bridge building process is stated in the paper. Radioactive steel can be utilized in many parts of the bridge. In
the paper it is described its use as reinforcement of piles. Short time period external irradiation of workers and inhabitants
is taken into account. Critical group (i.e. the group that gets the highest accumulated dose) of workers or inhabitants is
chosen. Specific mass activity of released radioactive waste carbon steel is related to individual effective dose taken by
critical group. Following legislation rules, annual effective dose taken by critical group must not overstep the limit of 10
μSv/year. <strong>The</strong> determination of value of the specific mass activity is the target of scenarios evaluating. Evaluation of
model scenarios can be realized with the appropriate calculation tool. In the paper VISIPLAN 3D ALARA planning tool
was
Session
chosen.
L5 - H5 - H6
3) 40071 – Modelling of Motorway Tunnels Scenario for Utilization of Conditionally Released Radioactive
Materials
Tomas Hrncir, Michal Panik, Vladimir Necas, Slovak University of Technology in Bratislava (Slovakia)
Considerable amount of solid radioactive waste is generated during the decommissioning of nuclear installations.
Some of the materials can be released into the environment either in a direct way, if they meet the releasing limits, or
after the application of some procedures leading to meeting the limits. If materials exceed these limits, they are treated,
conditioned and disposed of at appropriate repository of radioactive waste. Another possible releasing way is the
conditional release of materials, which is discussed in this paper. <strong>The</strong> basic principles of conditional release as well as
possibilities of reusing of the conditionally released materials are described. One of these possibilities of the reusing was
chosen and application proposal of conditional release of metal waste - steel reinforcement in the concrete, which could
be used for construction of motorway tunnels, was created. <strong>The</strong> computer code Visiplan 4.0 3D ALARA planning tool
software was used for the calculation of effective individual dose for personnel constructing the tunnel and for critical
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