Assessment of shutdown dose rates at the ESS target cooling system using SCALE6.2

Amalia Chambon*, Esben Klinkby, Leif Emås, Bent Lauritzen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The production of high-energy neutrons at the European Spallation Source through the spallation process may cause an erosion of the tungsten target. The eroded particles could be released into the target helium cooling system which contains four kind of filters. Among them, the auxiliary filters called 'getters' are designed to capture volatile elements and remaining dust. In this work, the ORNL's SCALE6.2 modelling and simulation suite for nuclear safety analysis is applied to assess shutdown dose rates and determine if added shielding and/or robotic arms are needed for their maintenance. SCALE6.2 is well adapted to treat this problem as it allows for isotope selection regarding source term calculation. Dose rates are determined by an ORIGEN2 source term and a MAVRIC shielding sequence calculation. As SCALE6.2 is non-standard software for ESS, the results are verified against MCNP, which is the baseline tool for neutronics analysis at ESS. Dose rate calculations show that additional shielding and/or robot arm are not needed to remove the getters after 3 months of cooling time, following 5400 h of operation at 5 MW beam power. At a distance of 1 mm from the getter, the dose rate is 0.2 mSv/h in the most conservative estimation.
Original languageEnglish
JournalJournal of Neutron Research
Volume22
Issue number2-3
Pages (from-to)309-318
ISSN1023-8166
DOIs
Publication statusPublished - 2020

Keywords

  • European Spallation Source
  • Getters
  • Gamma dose rate
  • SCALE6.2
  • MCNP6.2

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