Blind benchmark exercise for spent nuclear fuel decay heat

Research output: Contribution to journalArticlepeer-review


  • UU - Uppsala University
  • Vattenfall Services Nodic AB
  • NAGRA - National Cooperative for the Disposal of Radioactive Waste
  • KIT - Karlsruhe Institute of Technology
  • UPM - Universidad Politécnica de Madrid
  • CIEMAT - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
  • JSI - Jozef Stefan Institute

Documents & links


The decay heat rate of five spent nuclear fuel assemblies of the pressurized water reactor type were measured by calorimetry at the interim storage for spent nuclear fuel in Sweden. Calculations of the decay heat rate of the five assemblies were performed by 20 organizations using different codes and nuclear data libraries resulting in 31 results for each assembly, spanning most of the current state-of-the-art practice. The calculations were based on a selected subset of information, such as reactor operating history and fuel assembly properties. The relative difference between the measured and average calculated decay heat rate ranged from 0.6% to 3.3% for the five assemblies. The standard deviation of these relative differences ranged from 1.9% to 2.4%.


Original languageEnglish
Pages (from-to)1-21
Number of pages21
JournalNuclear Science and Engineering
Publication statusPublished - 11 Mar 2022


  • Spent nuclear fuel, Decay heat, Calorimeter, Experimental measure, Validation

ID: 7543199