Results of an Aqueous Source Term Model for a Radiological Risk Assessment of the Drigg LLW site, UK

J. S. Small; P. N. Humphreys; T. L. Johnstone; R. Plant; M. G. Randall; D. P. Trivedi

doi:10.1557/PROC-608-129

Results of an Aqueous Source Term Model for a Radiological Risk Assessment of the Drigg LLW site, UK

J. S. Small, P. N. Humphreys, T. L. Johnstone, R. Plant, M. G. Randall, D. P. Trivedi

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Abstract

A radionuclide source term model has been developed which simulates the biogeochemical evolution of the Drigg low level waste (LLW) disposal site. The DRINK (DRIgg Near field Kinetic) model provides data regarding radionuclide concentrations in groundwater over a period of 100,000 years, which are used as inputs to safety assessment calculations. The DRINK model considers the coupled interaction of the effects of fluid flow, microbiology, corrosion, chemical reaction, sorption and radioactive decay. The model simulates the development of a period of reducing conditions resulting from degradation of cellulose and steel wastes. Under these conditions U and Th remain as solubility controlling solids for periods over 30,000 years and provide an important source of daughter nuclides such as Ra. The fraction of ¹⁴C is followed through all reactions involving carbon. Less than 5% of ¹⁴C is present as mobile aqueous species.

Original language	English
Article number	129
Number of pages	6
Journal	Materials Research Society Symposium - Proceedings
Volume	608
DOIs	https://doi.org/10.1557/PROC-608-129
Publication status	Published - 1 Dec 1999
Externally published	Yes
Event	Scientific Basis for Nuclear Waste Management XXII: 1998 Materials Research Society Fall Meeting - Boston, United States Duration: 30 Nov 1998 → 4 Dec 1998 Conference number: 22

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AU - Randall, M. G.

AU - Trivedi, D. P.

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Results of an Aqueous Source Term Model for a Radiological Risk Assessment of the Drigg LLW site, UK

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