Title: New fixed-point mini-cell to investigate thermocouple drift in a high-temperature environment under neutron irradiation
Authors: LAURIE MathiasSADLI M.FAILLEAU GVLAHOVIC LukaFUETTERER MichaelLAPETITE Jean-MarcFOURREZ StéphaneRONDINELLA Vincenzo
Citation: IEEE TRANSACTIONS ON NUCLEAR SCIENCE
Publisher: IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Publication Year: 2016
JRC N°: JRC93047
ISSN: 0018-9499
URI: http://ieeexplore.ieee.org/abstract/document/7465536/?section=abstract
http://publications.jrc.ec.europa.eu/repository/handle/JRC93047
DOI: 10.1109/ANIMMA.2015.7465536
Type: Articles in periodicals and books
Abstract: Temperature measurements in the nuclear field require a high degree of reliability and accuracy. Despite their sheathed form, thermocouples subjected to nuclear radiations undergo changes due to radiation damage and transmutation that lead to significant EMF drift during long-term fuel irradiation experiment. For the purpose of a High Temperature Reactor fuel irradiation to take place in the High Flux Reactor Petten, a dedicated fixed-point cell was jointly developed by LNE-Cnam and JRC-IET. The developed cell to be housed in the irradiation rig was tailor made to quantify the thermocouple drift during the irradiation (about two year duration) and withstand high temperature (in the range 950 °C-1100 °C) in the presence of contaminated helium in a graphite environment. Considering the different levels of temperature achieved in the irradiation facility and the large palette of thermocouple types aimed at surveying the HTR fuel pebble during the qualification test both copper (1084.62 °C) and gold (1064.18 °C) fixed-point materials were considered. The aim of this paper is to first describe the fixed-point mini-cell designed to be embedded in the reactor rig and to discuss the preliminary results achieved during some out of pile tests as much as some robustness tests representative of the reactor scram scenarios.
JRC Directorate:Nuclear Safety and Security

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