Impact of repository depth on residence times for leaking radionuclides in land-based surface water
2006 (English)In: Proceedings of the 11th International High Level Radioactive Waste Management Conference, IHLRWM, 2006Conference paper (Refereed)
The multiple scales of landscape topography produces a wide distribution of groundwater circulation cells that control the hydro-geological environments surrounding geological repositories for nuclear waste. The largest circulation cells tend to discharge water into major river reaches, large freshwater systems or the nearby Sea. We investigated numerically the release of radionuclides from repositories placed in bedrock with depths between 100 to 2,000 meters in a Swedish coastal area and found that, leakage from the deeper positions emerges primarily in the major aquatic systems. In effect, radionuclides from the deeper repositories are more rapidly transported towards the Sea by the stream system compared to leakage from more shallow repositories. The release from the shallower repositories is significantly retained in the initial stage of the transport in the (superficial) landscape because the discharge occurs in or near low-order streams with high retention characteristics. This retention and residence time for radioactivity in the landscape control radiological doses to biota and can, thus, be expected to constitute an essential part of an associated risk evaluation.
Place, publisher, year, edition, pages
IdentifiersURN: urn:nbn:se:kth:diva-85476ISBN: 9781604236293OAI: oai:DiVA.org:kth-85476DiVA: diva2:499897
11th International High Level Radioactive Waste Management Conference; Las Vegas, NV; 30 April 2006 through 4 May 2006
QC 201202242012-02-132012-02-132012-02-24Bibliographically approved