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

Abstracts
radioactive substance. At the same time, gels and bottom sedimentation may have high levels of radioactivity. Under the
project implementation, there has been developed a contact-free suction way of sampling from the container for storage
of LRW. <strong>The</strong>re has been designed a unit for taking samples from different depths in the container and placing them into a
special vessel for their storage and transportation. Results of analyses of physical, chemical, radiometric and spectral
features of the selected samples will allow to development of a technology for the container content decontamination and
transformation of radioactivity of LRW stored in the container into a stable and compact form for their further disposal.
9) 40197 – Inspection of Burial Points of Radioactive Waste in the Republic of Tajikistan
Nazirzhon Buriev,Physical-Technical Institute of the Academy of Sciences (Tajikistan);
Akram Juraev, Dzhamshed Abdushukurov,
S.U.Umarov Physical Technical Institute of Academy of Sciences of Republic of Tajikistan, (Tajikistan)
Under implementation of the <strong>International</strong> Scientific and Technical Center (ISTC) Project ?1082.3 « Inspection of
Republican Point of Burial Radioactive Wastage with the Purpose of Development of the Technical Decision on its
Rehabilitation », there has been made a survey of the radioactive waste disposal sites in the RPBRW area for the whole
period of its activity, starting from 1962 and up to the present time. Before commencement of practical surveys, we had
studied the following: the RPBRW documentation, foundation history, geographical location, seismic and climatic
conditions of the area, engineering and technical documentation, history of previous radioactive waste disposals and the
present state of affairs. <strong>The</strong>re had been arranged meetings and interviews with the RPBRW officers and workers, during
which information of interest was collected. <strong>The</strong>re had been made a gamma- and neutron-survey of all the RPBRW
facilities located in the Center’s restricted, controlled and observation zones. Results of the surveys are provided in the
form of figures put on the facility routing survey maps. During the surveys, there had been selected samples of soils, silts,
vegetation, sewage waters, atmospheric precipitation and tap water throughout the RPBRW area. In particular, there had
been selected: in the restricted zone – 109 samples, in the controlled zone – 13 samples, in the observation zone – 91
samples, and in the adjacent territory – 22 samples. In total, there were taken 235 samples out of which: soils – 210
samples, vegetation – 10 samples, silts – 2 samples, sewage waters – 10 samples, tap water – 2 samples, and snow – 1
sample. All the samples were selected, packed, marked, and transported to laboratory to prepare them for radiometric and
spectral studies in strict observance of the methodical guidelines developed. <strong>The</strong> tests were made by means of HPG
detector manufactured by a firm “Canberra”. In the restricted zone, soil samples were taken from the surface as well as
from pits, to trace soil migration of radionuclides. Pits were dug out up to 2m deep around radioactive waste disposal
sites down the slope of a hill. <strong>The</strong>re are no open water sources in the RPBRW area. We selected precipitation waters
flowing across the RPBRW area, which may bear important information on radiation situation. Samples were taken in the
spring time right after raining. Selection points were atmospheric precipitation drains and natural collectors near the
RPBRW facilities. On the same sites there were taken the samples of silt borne by waste waters. Vegetation samples
were annual grasses and bushes thriving in the RPBRW area, as well as arboraceous samples (acacia tree). To trace
possible migration of radionuclides into the trunk of a tree growing in the close vicinity of the radioactive waste disposal
site, there had been taken samples of its bark, trunk, small annual branches and leaves. Results of the sample laboratory
tests are incorporated into the Project T-1082.3 general database compiled as tables in Microsoft Office Excel format.
10) 40198 – Pre-treatment Method of Powder Waste for Vitrification
Deun-Man Kim, Hyun-Je Cho, Jong-Kil Park, Nuclear Engineering & Technology Institute (Korea Rep.)
Solidification techniques to reduce the volume of the waste have been developed using binder materials such as
cement, paraffin, and polymer. A vitrifying technique that realizes high volume reduction and stably confines
radioactivity within the glass material was researched with dried powder waste. Boric acid waste in PWRs is dried on
Concentrated Waste Dry System (CWDS). In the case of feeding the powder wastes into a cold crucible induction melter
without pre-treatment, there is a possibility that the powder waste may enter the off-gas treatment system before mixture
with melted glass and the feeding pipes could be clogged because of accumulation of these waste. A method to pre-treat
the concentrated waste by pelletizing powder waste was studied for a vitrification process. Final products were satisfied
with the requirements of hardness and friability. This research presents the pretreatment method of powder waste to
apply on vitrification facilities.
11) 40208 – Characterization and Pre-treatment of LLW in Turkey
Ahmet Erdal Osmanlioglu, Turkish Atomic Energy Authority (Turkey)
Pre-treatment of radioactive waste is the first step in waste management program that occurs after waste generation
from various applications in Turkey. Pre-treatment and characterization practices are carried out in Radioactive Waste
Management Unit (RWMU) at Cekmece Nuclear Research and Training Center (CNRTC) in Istanbul. This facility has
been assigned to take all low-level radioactive wastes generated by nuclear applications in Turkey. <strong>The</strong> wastes are
generated from research and nuclear applications mainly in medicine, biology, agriculture, quality control in metal
processing and construction industries. <strong>The</strong>se wastes are classified as low- level radioactive wastes. Pre-treatment
practices cover several steps. In this paper, main steps of pre-treatment and characterization are presented. Basically these
are; collection, segregation, chemical adjustment, size reduction and decontamination operations.
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