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RN Fractional Release of High Burn-Up Fuel: Effect of HBS and Estimation of Accessible Grain Boundary

Published online by Cambridge University Press:  01 February 2011

F. Clarens ,
D. Serrano-Purroy ,
A. Martínez-Esparza ,
D. Wegen ,
E. Gonzalez-Robles ,
J. de Pablo ,
I Casas ,
J. Giménez ,
B. Christiansen  and
J.P. Glatz
F. Clarens
Affiliation:
CTM Centre Tecnològic, Av Bases de Manresa 1, 08242, Spain
D. Serrano-Purroy
Affiliation:
JRC-ITU, European Commission Joint Research Centre-Institute of Transuranium Elements, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
A. Martínez-Esparza
Affiliation:
ENRESA, Emilio Vargas 7, Madrid, Spain.
D. Wegen
Affiliation:
JRC-ITU, European Commission Joint Research Centre-Institute of Transuranium Elements, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
E. Gonzalez-Robles
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya UPC, Av Diagonal 647, 08028, Barcelona, Spain
J. de Pablo
Affiliation:
CTM Centre Tecnològic, Av Bases de Manresa 1, 08242, Spain Chemical Engineering Department, Universitat Politècnica de Catalunya UPC, Av Diagonal 647, 08028, Barcelona, Spain
I Casas
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya UPC, Av Diagonal 647, 08028, Barcelona, Spain
J. Giménez
Affiliation:
Chemical Engineering Department, Universitat Politècnica de Catalunya UPC, Av Diagonal 647, 08028, Barcelona, Spain
B. Christiansen
Affiliation:
JRC-ITU, European Commission Joint Research Centre-Institute of Transuranium Elements, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
J.P. Glatz
Affiliation:
JRC-ITU, European Commission Joint Research Centre-Institute of Transuranium Elements, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen, 76344, Germany
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Abstract

The so-called Instant Release Fraction (IRF) is considered to govern the dose released from Spent Fuel repositories. Often, IRF calculations are based on estimations of fractions of inventory release based in fission gas release [1]. The IRF definition includes the inventory located within the Gap although a conservative approach also includes both the Grain Boundary (GB) and the pores of restructured HBS inventories.

A correction factor to estimate the fraction of Grain Boundary accessible for leaching has been determined and applied to spent fuel static leaching experiments carried out in the ITU Hot Cell facilities [2]. Experimental work focuses especially on the different properties of both the external rim area (containing the High Burn-up Structure (HBS)) and the internal area, to which we will refer as Out and Core sample, respectively. Maximal release will correspond to an extrapolation to simulate that all grain boundaries or pores are open and in contact with solution.

The correction factor has been determined from SEM studies taking into account the number of particles with HBS in Out sample, the porosity of HBS particles, and the amount of transgranular fractures during sample preparation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1107: Scientific Basis for Nuclear Waste Management XXXI , 2008 , 439
Copyright
Copyright © Materials Research Society 2008

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