TITLE:
Evaluation of Uncertainties Related to the Near Field Model of Geological Repository for Spent Nuclear Fuel
AUTHORS:
Dana Barátová, Vladimír Nečas
KEYWORDS:
Geological Disposal, Near Field Model, GoldSim, Uncertainty, Probabilistic Simulation
JOURNAL NAME:
World Journal of Engineering and Technology,
Vol.3 No.3C,
October
22,
2015
ABSTRACT: In Slovakia, a direct disposal of spent
nuclear fuel in a deep geological repository within the country after a certain
period of interim storage is a preferred option. This paper briefly describes
near field model of radionuclide migration developed in GoldSim simulation code
environment and analyses the calculated results on time-dependent release rates
of safety relevant radionuclides. Given the fact that GoldSimalso enables to
perform probabilistic simulations using the Monte Carlo method, a probabilistic
approach was chosen to assess the influence of selected near field parameter uncertainties
related to radionuclide migration on the radionuclide release rates from the
bentonite buffer to the surrounding host rock. Based on the results, release
rates of nuclides which exceed their solubility limits are effectively lowered
and many of nuclides are significantly sorbed on the buffer material. It can be
seen that the variance of the total release rate in the case of solubility
uncertainty is almost two orders of magnitude within a long period of time.