Welcome to the Autumn 2003 edition of Quintessa Update, the electronic newsletter of Quintessa Limited.
Best Practicable Environmental Option for LLW at Dounreay
|Reproduced by kind permission of UKAEA|
Wham! (Web-Hosted AMBER Model)
|Quintessa is committed to providing online modelling tools that allow stakeholders to draw their own conclusions about environmental impacts. The latest of these (Wham!) is based upon the hypothetical Vault Test Case developed as part of the IAEA's Co-ordinated Research Project (CRP) on Improvement of Safety Assessment Methodologies for Near Surface Disposal Facilities (ISAM). The model represents a near-surface radioactive waste repository (vault) and simulates the fate of the contaminants released due to the infiltration of water. Contaminants are leached from the vault into the unsaturated zone and then into an underlying aquifer. They are then transported through the aquifer to a well from which water is abstracted for human use. Wham! has been designed with two graphical user interfaces, intended to make the model understandable and useable by both people with little experience of this kind of modelling and by advanced users, and is capable of automatically generating both web-based and PDF reports.|
Development of Waste Package Evolution Scenarios
Quintessa has assisted Nirex in developing waste package evolution scenarios for the geological disposal of low-level and intermediate-level wastes, as input to investigating the importance of time-dependency and heterogeneity effects on post-closure repository performance*. In addition to a base scenario, seven variant scenario classes have been defined representing combinations of enhanced water flux, altered water chemistry and physical disruption, and scenarios were presented as combined storyboards and timelines.
|Reproduced by kind permission of CIRIA|