Long term safety assessment of disposal concepts for HLW and spent fuel in rock salt
- GSF-Forschungszentrum, Braunschweig (Germany). Inst. fuer Tieflagerung
Disposal of high-level radioactive waste in Germany is planned to take place in deep salt repositories. Direct disposal of spent fuel is taken into account as well as disposal of reprocessed high-level waste. Borehole and drift emplacement techniques are considered for both HLW and spent fuel. The following disposal concepts are taken into account: pure borehole emplacement with waste in steel drums or canisters, pure drift emplacement with waste in Pollux casks, and combined drift and borehole emplacement. Each of these concepts was investigated for different ratios of waste from direct disposal and from reprocessing. Long term safety assessments were performed with scenarios of brine intrusion via possible anhydrite veins and from brine pockets in the surrounding salt rock. A survey of the disposal concepts as well as the models used by the computer code for long term safety assessment will be presented. The safety assessments investigated the influence of the geometrical layout of the emplacement sites, the layout temperature of the entire repository and the different behavior of spent fuel and reprocessed waste. The calculations were performed both deterministic and probabilistic. The deterministic calculations were performed with best estimate values of the input parameters and in some variants with locally varied values of selected parameters.
- OSTI ID:
- 178132
- Report Number(s):
- CONF-950917--; ISBN 0-7918-1219-7
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
DESIGN
EXPERIMENTAL DATA
FEDERAL REPUBLIC OF GERMANY
HIGH-LEVEL RADIOACTIVE WASTES
MATHEMATICAL MODELS
PROBABILISTIC ESTIMATION
RADIOACTIVE WASTE DISPOSAL
RADIOACTIVE WASTE FACILITIES
RADIONUCLIDE MIGRATION
SAFETY ANALYSIS
SALT DEPOSITS
SENSITIVITY ANALYSIS
SPENT FUELS
THERMAL ANALYSIS
UNDERGROUND DISPOSAL
WASTE FORMS
WATER INFLUX