Title: Determination of fission gas release of spent nuclear fuel in puncturing test and in leaching experiments under anoxic conditions
Authors: GONZÁLEZ-ROBLES ErnestoMETZ V.WEGEN DetlefHERM M.PAPAIOANNOU DimitriosBOHNERT E.GRETTER RalfMÜLLER NikolausNASYROW RamilDE WEERD WimWISS ThierryKIENZLER B.
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 479 p. 67-75
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2016
JRC N°: JRC102738
ISSN: 0022-3115
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC102738
DOI: 10.1016/j.jnucmat.2016.06.035
Type: Articles in periodicals and books
Abstract: During reactor operation the fission gases Kr and Xe are formed within the UO2 matrix of nuclear fuel. Their quantification is important to evaluate their impact on critical parameters regarding the fuel behaviour during irradiation and (long-term) interim storage, such as internal pressure of the fuel rod and fuel swelling. Moreover the content of Kr and Xe in the plenum of a fuel rod and their content in the UO2 fuel itself are widely used as indicators for the release properties of 129I, 137Cs, and other safety relevant radionuclides with respect to final disposal of spent nuclear fuel. The present study deals with the fission gas release from spent nuclear fuel exposed to simulated groundwater in comparison with the fission gas previously released to the fuel rod plenum during irradiation in reactor. In a unique approach we determined both the Kr and Xe inventories in the plenum by means of a puncturing test and in leaching experiments with a cladded fuel pellet and fuel fragments in bicarbonate water under 3.2 bar H2 overpressure. The fractional inventory of the fission gases released during irradiation into the plenum was (8.3 ± 0.9) %. The fraction of inventory of fission gases released during the leaching experiments was (17 ± 2) % after 333 days of leaching of the cladded pellet and (25 ± 2) % after 447 days of leaching of the fuel fragments, respectively. The relatively high release of fission gases in the experiment with fuel fragments was caused by the increased accessibility of water to the Kr and Xe occluded in the fuel.
JRC Directorate:Nuclear Safety and Security

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.