Performance assessment of confinements for medium-level and alpha-contaminated waste : PACOMA project - Rock salt option
The overall objective of the Pacoma project is the assessment of the consequences associated with deep disposal of radioactive waste in three types of geological formation. The objective of the present contribution to the project is to develop and demonstrate procedures for radiological safety of repositories in salt domes. The present report discusses how far appropriate choice of the repository design parameters can improve the whole system. The research covers deterministic calculations for three scenarios: the normal evolution scenario with subrosion of the salt dome, the combined brine intrusion scenario with brine intrusion from brine pockets and via an anhydrite vein, and the human intrusion scenario of solution mining of a storage cavern. For the combined brine intrusion scenario alternative waste inventories, different disposal concepts, variants of the layout of dams and sealings are investigated, and results obtained from variations of parameter values are discussed. Additionally, for this scenario, comprehensive probabilistic calculations have been carried out with the help of a Monte Carlo simulation. Results are discussed in the form of an uncertainty analysis of the maximum dose and global sensitivity studies of system parameters. The main result of the assessment is that, in the reference case where the reference repository design and the reference disposal concept are applied, deterministic calculations with best estimate values as well as probabilistic calculations do not manifest unacceptable risk. Investigation of alternative concepts and design variants indicate a high potential for system optimisation.
Bibliographic Reference: EUR 13634 EN (1991) 297 pp., FS, ECU 23.75
ISBN: ISBN 92-826-2967-8
Record Number: 199111268 / Last updated on: 1994-12-02
Original language: en
Available languages: en