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

Abstracts Session 19
3) THE ENVIRONMENTAL MONITORING SYSTEM DEVELOPED WITHIN THE FRAMEWORK
OF THE FRENCH RADIOACTIVE WASTE DEEP REPOSITORY PROJECT (w/oP-59296)
Elisabeth Leclerc; Patrick Landais, Andra (France)
In 2007, an environmental monitoring system, called the Observatoire Pérenne de lEnvironnement (OPE) was launched by
Andra in order to establish the environmental initial state and to monitor ecosystems around the Meuse/Haute-Marne region (East
of France), before the potential installation of a national deep repository of radioactive waste. The OPE aims to characterize an area
covering 900 hundreds of kilometres and to follow environmental evolutions during exploitation, i.e. over 100 years.
The OPE is associated to a comprehensive research and development program involving the deployment of important scientific
tools covering all environmental compartments since several years. The objectives are:
• to gather and analyse physical, chemical, biological and radiological data on the initial state of the environment including
samples preservation from different areas (air, water, forest wildlife and flora, soils, agricultural food chain, etc.)
• to assess the very long term evolution of the environmental quality;
• to model elements biogeochemical cycles, mass and energy fluxes and to study interactions of processes between environmental
areas;
• to anticipate impacts from anthropogenic pressures (industrial, agricultural, climatic, on a local or global scale);
• to study links between environment and human health.
The OPE is currently developing large-scale scientific tools and collecting…
SESSION 19 — POSTER SESSION: SPENT FUEL, FISSILE, TRANSURANIC
AND HIGH LEVEL WASTE MANAGEMENT (2.1)
1) ADONIS, HIGH COUNT RATE HP-GE Ƴ SPECTROMETRY ALGORITHM:
IRRADIATED FUEL ASSEMBLY MEASUREMENT (wP-59234)
Patrick Pin, AREVA NC; Eric Barat, Thomas Dautremer, Thierry Montagu, Stéphane Normand, CEA - Saclay (France)
ADONIS is a digital system for gamma-ray spectrometry, developed by CEA. This system achieves high count-rate gammaray
spectrometry with correct dynamic dead-time correction, up to, at least, more than an incoming count rate of 3:106 events per second.
An application of such a system at AREVA NC’s La Hague plant is the irradiated fuel scanning facility before reprocessing.
The ADONIS system is presented, then the measurement set-up and, last, the measurement results with reference measurements.
2) TECHNICAL KNOW-HOW FOR THE INVESTIGATION AND MODELLING OF
TOPOGRAPHIC EVOLUTION FOR SITE CHARACTERISATION (wP-59171)
Ryosuke Doke, Ken-ichi Yasue, Tadafumi Niizato, Akio Nakayasu, Japan Atomic Energy Agency (Japan)
Geological hazard assessments are being used to make important decisions relevant to the constructing nuclear facilities such
as repositories for deep geological disposal of high-level radioactive waste. With respect to such repositories, topographic evolution
is a key issue for description of the long-term evolution of a groundwater flow characteristics in time spans of tens to hundreds
of thousands of years. The construction of topographic evolution model is complex, involving tacit knowledge and working
processes. Therefore, it is important to externalise, that is to explicitly present the tacit knowledge and decision-making processes
used by experts in the model building unambiguously, with thorough documentation and to provide key knowledge to support planning
and implementation of investigations.
In this study, documentation of the technical know-how used for the construction of a topographic evolution model is demonstrated.
The process followed in the construction of the model is illustrated using task-flow logic diagrams; the process involves
four main tasks with several subtasks. The task-flow for an investigation to estimate uplift rates is also illustrated linked to the taskflow
for the modelling of topographic evolution. In addition, the decision-making processes in the investigation are expressed in
logical IF-THEN format for each task. Based on the documented…
3) VALIDATION OF CORRELATIONS BETWEEN ND ISOTOPES AND DIFFICULT-TO-MEASURE NUCLIDES
PREDICTED WITH BURN-UP CALCULATION CODE BY POST IRRADIATION EXAMINATION (wP-59086)
Shiho Asai, Keisuke Okumura, Yukiko Hanzawa, Hideya Suzuki, Masaaki Toshimitsu, Jun Inagawa, Takaumi Kimura,
Japan Atomic Energy Agency; Satoru Kaneko, Kensuke Suzuki, Tokyo Electric Power Company (Japan)
Correlations between Nd isotopes and difficult-to-measure (DTM) nuclides, such as Se-79, Tc-99, Sn-126, and Cs-135, predicted
using a calculation code have been validated by postirradiation examination (PIE). The calculation was performed with a
burnup calculation code, MVP-BURN, using the updated nuclear data library JENDL-4.0. An irradiated PWR fuel with a burnup
of 44.9 GWd/t and a cooling time of 7458 days was used as a standard sample. The concentrations of Nd isotopes in the sample
solutions were determined by inductively coupled plasma mass spectrometry (ICP-MS) after purification by two consecutive anionexchange
separations. The ratios of Se-79 and Cs-135 to Nd isotopes (Nd-145, Nd-146, and Nd-145+Nd-146) calculated using
MVP-BURN were in good agreement with PIE values within the deviations of 8% and 6%, respectively. This indicates that these
calculated ratios are applicable to the scaling factors of Se-79 and Cs-135. For Tc-99 and Sn-126, the calculated values were respectively
about 50% and 20% higher than the PIE values. These overestimations were mainly caused by the lack of the contribution
of an insoluble residue to the measured concentrations.
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