Shutdown Dose Rate Calculations of JET Using ORCS (ORNL R2S Code Suite)

Bor Kos, Georgeta Radulescu, Robert Grove, Rosaria Villari, Paola Batistoni

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

As fusion systems grow in complexity and size, it is imperative to develop and validate computational tools to analyze them. One of the fundamental quantities of interest related to fusion machines is the shutdown dose rate (SDDR). This dose rate is produced by decay gamma rays from radionuclides that become activated during the operation of a fusion system. Determining SDDR with the rigorous two-step (R2S) method is a computationally expensive task because it involves a neutron transport simulation (step 1) followed by activation calculations and a photon transport simulation (step 2) in complex geometries. The Oak Ridge National Laboratory R2S Code Suite (ORCS) implements the multi-step consistent adjoint driven importance sampling (MS-CADIS) technique to determine optimal variance reduction parameters for the final quantity of interest-the SDDR. In this paper, the application of ORCS to the 2016 High Performance Deuterium-Deuterium campaign at the Joint European Torus (JET) is presented. ORCS was used to determine SDDR at several cooling times after shutdown at two locations in Octant 1 and Octant 2 of JET. The computational results were compared to experimental results consisting of on-line air kerma measurements with ionization chambers. The ratio of calculated to experimental air kerma values for Octant 1 range from 0.8 to 1.7; for Octant 2 they range from 0.6 to 2.5. These results are similar to those of analyses performed by other institutions using both similar and different methods. Future work includes evaluation of the JET 2019 Deuterium-Deuterium campaign and the 2021 Deuterium-Tritium campaign using ORCS to support the preparation for ITER operation.

Original languageEnglish
Title of host publicationProceedings of the International Conference on Physics of Reactors, PHYSOR 2022
PublisherAmerican Nuclear Society
Pages2933-2942
Number of pages10
ISBN (Electronic)9780894487873
DOIs
StatePublished - 2022
Event2022 International Conference on Physics of Reactors, PHYSOR 2022 - Pittsburgh, United States
Duration: May 15 2022May 20 2022

Publication series

NameProceedings of the International Conference on Physics of Reactors, PHYSOR 2022

Conference

Conference2022 International Conference on Physics of Reactors, PHYSOR 2022
Country/TerritoryUnited States
CityPittsburgh
Period05/15/2205/20/22

Funding

This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences under the Collaboration to Benchmark Neutronics Simulation Computer Codes under the EURATOM-U.S. DOE Agreement in the Field of Fusion Energy Research and Development. The authors acknowledge the support of EUROfusion Preparation of ITER Operation (PrIO) project leader avX ier Litaudon. The authors acknowledge Scott Mosher and Stephen Wilson for their development of ADVANTG, MS,X and NAGSS, and their efforts to validate the SDDR Code Suite on benchmark experiments. See the author list of 'Overview of JET results for optimizing ITER operation' by J. Mailloux et al. to be published in Nuclear Fusion Special issue: Overview and Summary Papers from the 28th Fusion Energy Conference (Nice, France, 10-15 May 2021). † Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences under the Collaboration to Benchmark Neutronics Simulation Computer Codes under the EURATOM-U.S. DOE Agreement in the Field of Fusion Energy Research and Development. The authors acknowledge the support of EUROfusion Preparation of ITER Operation (PrIO) project leader Xavier Litaudon. The authors acknowledge Scott Mosher and Stephen Wilson for their development of ADVANTG, MSX, and NAGSS, and their efforts to validate the SDDR Code Suite on benchmark experiments.

Keywords

  • ADVANTG
  • JET
  • MS-CADIS
  • ORCS
  • SDDR

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