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Title: Development of a leach model for a commercial nuclear waste glass

Abstract

A leach model is presented for a commonly studied commercial nuclear waste glass, PNL 76-68. Boron release is taken to be a monitor of the reaction rate of the glass, while the actual releases of many other glass constituents into solution during static tests are evidently controlled by solubilities. The reaction rate determined in this way passes from linear to parabolic kinetics over the duration of the experiments analyzed, and boron concentrations in solution are found to be a function of the product of time and surface areato-solution volume ratio. This behavior is found to be explained well by assuming the reaction is impeded by resorption of reaction products onto the reacting surface. Two model parameters are found as functions of temperature by fitting the model to published data. It is concluded that the accumulation of silica near the glass surface in a waste package in a repository could limit the rate of reaction of the glass, but not that the reaction would cease as silica reaches its solubility limit in solution.

Authors:
; ;
Publication Date:
Research Org.:
Pacific-Northwest Laboratory, Richland, WA
OSTI Identifier:
6319150
Resource Type:
Journal Article
Journal Name:
Nucl. Technol.; (United States)
Additional Journal Information:
Journal Volume: 63:1
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; BOROSILICATE GLASS; LEACHING; MATHEMATICAL MODELS; RADIOACTIVE WASTE DISPOSAL; WASTE FORMS; BORON; REACTION KINETICS; SILICA; TEMPERATURE EFFECTS; TIME DEPENDENCE; CHALCOGENIDES; DISSOLUTION; ELEMENTS; GLASS; KINETICS; MANAGEMENT; MINERALS; OXIDE MINERALS; OXIDES; OXYGEN COMPOUNDS; SEMIMETALS; SEPARATION PROCESSES; SILICON COMPOUNDS; SILICON OXIDES; WASTE DISPOSAL; WASTE MANAGEMENT; 052002* - Nuclear Fuels- Waste Disposal & Storage

Citation Formats

Kuhn, W L, Peters, R D, and Simonson, S A. Development of a leach model for a commercial nuclear waste glass. United States: N. p., 1983. Web.
Kuhn, W L, Peters, R D, & Simonson, S A. Development of a leach model for a commercial nuclear waste glass. United States.
Kuhn, W L, Peters, R D, and Simonson, S A. 1983. "Development of a leach model for a commercial nuclear waste glass". United States.
@article{osti_6319150,
title = {Development of a leach model for a commercial nuclear waste glass},
author = {Kuhn, W L and Peters, R D and Simonson, S A},
abstractNote = {A leach model is presented for a commonly studied commercial nuclear waste glass, PNL 76-68. Boron release is taken to be a monitor of the reaction rate of the glass, while the actual releases of many other glass constituents into solution during static tests are evidently controlled by solubilities. The reaction rate determined in this way passes from linear to parabolic kinetics over the duration of the experiments analyzed, and boron concentrations in solution are found to be a function of the product of time and surface areato-solution volume ratio. This behavior is found to be explained well by assuming the reaction is impeded by resorption of reaction products onto the reacting surface. Two model parameters are found as functions of temperature by fitting the model to published data. It is concluded that the accumulation of silica near the glass surface in a waste package in a repository could limit the rate of reaction of the glass, but not that the reaction would cease as silica reaches its solubility limit in solution.},
doi = {},
url = {https://www.osti.gov/biblio/6319150}, journal = {Nucl. Technol.; (United States)},
number = ,
volume = 63:1,
place = {United States},
year = {Sat Oct 01 00:00:00 EDT 1983},
month = {Sat Oct 01 00:00:00 EDT 1983}
}