Impact of approximations in operating history data on spent fuel properties with Serpent 2

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Abstract

This study investigates the effect of approximations in operating history on spent fuel properties. Assembly power, boron concentration and coolant temperature and density are averaged one by one over the entire operating history and separately over three irradiation cycles and compared to calculations using accurate weekly operating history data. The effect of averaging all the studied operating history parameters on activity, decay heat and photon emission rate is significant during the first few years of cooling, but becomes much smaller (< 1 %) after 10 y. The averaging always exaggerates these parameters at cooling times below 10 y. Almost all of the effect under 4 y of cooling is caused by the power history approximation. The effect of averaging on the other studied characteristics, spontaneous fission yield and the concentration of 14C, 36Cl, 239Pu and 241Pu was much smaller than on activity, decay heat and photon emission rate during the first few years of cooling.
Original languageEnglish
Title of host publicationNENE 2020: 29th International Conference Nuclear Energy for New Europe
EditorsLuka Snoj, Aljaz Cufar
Number of pages8
ISBN (Electronic)978-961-6207-49-2
Publication statusPublished - 2020
MoE publication typeA4 Article in a conference publication
Event29th International Conference Nuclear Energy for New Europe, NENE 2020: Connecting Science and Industry - Hybrid Conference, Portoroz, Slovakia
Duration: 7 Sep 202010 Sep 2020

Conference

Conference29th International Conference Nuclear Energy for New Europe, NENE 2020
Abbreviated titleNENE 2020
Country/TerritorySlovakia
CityPortoroz
Period7/09/2010/09/20

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