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

Session 44 Abstracts
test is to establish construction methodology and procedures which ensure the required quality of the engineered barrier system
(EBS) on-site. By fiscal 2010 some parts of the facilities has been constructed, and the test has demonstrated both practicability of
the construction and achievement of the quality. They are respectively taken as low-permeability of less than 5E-13 m/s and lowdiffusion
of less than 1E-12 m2 /s at the time of completion of construction. This paper covers the test results obtained by the construction
of some parts of a bentonite and cement materials.
3) DEMONSTRATION OF GAS PERMEABLE SEALS FOR RADIOACTIVE WASTE
REPOSITORIES LABORATORY AND IN-SITU EXPERIMENTS (wP-59224)
Joerg Rueedi, Paul Marschall, Nagra (Switzerland)
In low/intermediate-level waste (L/ILW) repositories, anaerobic corrosion of metals and degradation of organic materials produce
hydrogen, methane, and carbon dioxide. Gas migration in a L/ILW repository is one of the processes evaluated in the safety
assessment of deep geological disposal in low-permeability formations, in particular with respect to the development of gas pressures
in the repository caverns which could negatively affect the host rock or the engineered barrier system (EBS). In order to
restrict build-up of gas overpressures in the emplacement caverns, Nagra (National Cooperative for the Disposal of Radioactive
Waste, Switzerland) has proposed design options aimed at increasing the gas transport capacity of the backfilled underground structures,
compromising neither the low hydraulic conductivity nor the radionuclide retention capacity of the EBS (Nagra, 2008). They
involve specially designed backfill and sealing materials such as high porosity mortars as backfill materials for the emplacement
caverns and sand/bentonite (S/B) mixtures with a bentonite content of 20% to 30% for the seals themselves and for backfilling other
underground structures. These increased gas permeability materials can supplement the gas flow that is expected to occur through
the excavation damaged zone (EDZ) and avoid the creation of overpressures.
Preliminary experimental studies have confirmed the gas…
4) POST-IODINE PRODUCTION NORM REPOSITORY TECHNICAL DESIGN AND
RECONSTRUCTION EXPERIENCE IN TURKMENISTAN (wP-59183)
Alexander Gelbutovsky, Peter Cheremisin, Alexander Troshev, Alexander Egorov,
Mikhail M. Boriskin, Mikhail Bogod, ECOMET-S (Russia)
Continuous extraction of the iodine, bromine and other elements from the underground mineral waters at the Balkanabat
Iodine and Khazar chemical plants (Turkmenistan) resulted in their territories NORM contamination and significant waste quantities
formation. Sites radiation safety is the major issue. Usually there are no any radiation monitoring systems and staff providing
personnel, population and environment radiation safety and negative influence elimination. The most dangerous sites are the ones
which are situated in the Caspian Sea coastal area. In 2009 the remediation project was initiated to prevent NORM distribution and
eliminate environmental threat. The project frame covers a number of preparation and design works, charcoal sorption shops demolition,
territories remediation, production waste conditioning and transportation to the repository for further safe storage. For that
purposes the repository has been built in the near-by natural hollow. In the given report the materials related to repository design,
reconstruction and operations start are presented. The brief data on the facilities condition, contamination characteristics and waste
quantities are indicated. It is shown that that the mechanical method has been chosen for contaminated materials collecting and disposal.
Main demolition, remediation and transportation decisions, activities and results are mentioned also.
SESSION 44 — DISPOSAL SITE AND WASTE FORM CHARACTERIZATION
AND PERFORMANCE ASSESSMENT - PART 1 OF 2 (1.13)
1) RADIOLOGICAL CHARACTERIZATION OF THE DUTCH INTERIM
WASTE STORAGE FACILITY SITE (w/oP-59023)
Jeroen Welbergen, COVRA; Leo P.M. Velzen, Nuclear Research and Consultancy Group (Netherlands)
The Central Organization for Radioactive Waste (COVRA) in the Netherlands operates since 1993 in the south-west of the
Netherlands a facility for treatment of radioactive waste including interim storage buildings for HLW, LILW and NORM wastes as
calcinate and depleted uranium (U3O8 ). The site of the interim waste storage facility has a size of about 200,000 m2 and is situated
close to the Dutch nuclear power plant Borssele and a large phosphate production plant.
It is evident that the waste storage site is subjected at regular time intervals at non-intrusive radiological measurements (e.g.
dose-rate and contamination) to detect elevated radiation levels. However, these radiological measurements have not yet been performed
according to approaches as described in the Environment Radiation Site Survey Execution Manual EURSSEM or the Multi
Agency Radiation Site Survey Inspection Manual MARSSIM .
The aim of the paper is threefold, first to describe in detail the process how to apply EURSSEM and especially for fast nonintrusive
multi radiological detection techniques with control measurements. Second aim is to present and discuss the analyze
results and follow up actions. The third and last aim is to discuss the advantages and disadvantages of combining the analyze results
of fast non-intrusive measurements…
2) CLIMATE CHANGE IMPACTS ON THE DISPOSAL ENVIRONMENT:
A CLIMATE ANALOGUE APPROACH (wP-59274)
Bertrand Leterme, Dirk Mallants, SCK●CEN (Belgium)
The Belgian Agency for Radioactive Waste and Enriched Fissile Materials (ONDRAF/NIRAS) aims to develop a surface disposal
facility for L/ILW in Dessel (North-East of Belgium). The objective of this study is to provide estimates for the next few millennia
of both infiltration through the planned earth cover and groundwater recharge in the vicinity of the Dessel site. Available predictions
of future temperature and precipitation often extend until AD 2100 only (e.g. IPCC). To circumvent this data limitation,
we use existing records of climatic analogue stations deemed representative of future climates in Belgium. The following climate
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