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6CCVD Research

Nuclear design of a shielded cabinet for electronics - The ITER radial neutron camera case study

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2023-02-16
JournalFusion Engineering and Design
AuthorsF. Moro, D. Marocco, F. Belli, D. Bocian, G. Brolatti
InstitutionsUniversity of Trieste, National Agency for New Technologies, Energy and Sustainable Economic Development
Citations2

Abstract

Section titled ā€œAbstractā€

The Radial Neutron Camera (RNC) is a diagnostic system located in ITER Equatorial Port #1 providing several spatial and time-resolved parameters for the fusion power estimation, plasma control and physics studies. The RNC measures the uncollided 14 MeV and 2.5 MeV neutrons from deuterium-tritium (DT) and deuterium-deuterium (DD) fusion reactions through an array of neutron flux detectors located in collimated Lines of Sight. Signals from RNC detectors (fission chambers, single Crystal Diamonds and scintillators) need preamplification because of their low amplitude. These preamplifiers have to be as close as possible to the detectors in order to minimize signal degradation and must be protected against fast and thermal neutrons, gamma radiation and electromagnetic fields. The solution adopted is to host the preamplifiers in a shielded cabinet located in a dedicated area of the Port Cell, behind the Bioshield Plug. The overall design of the cabinet must ensure the necessary magnetic, thermal and nuclear shielding and, at the same, satisfy weight and allocated volume constraints and maintain its structural integrity. The present paper describes the nuclear design of the shielded cabinet, performed by means of 3D particle transport calculations (MCNP), taking into account the radiation streaming through the Bioshield penetrations and the cross-talk effect from the neighboring Lower and Upper Ports. We present the assessment of its nuclear shielding performances and analyze the compliancy with the alert thresholds for commercial electronics in terms of neutron flux and cumulated ionizing dose.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2022 - Progress of design and development for the ITER radial neutron camera [Crossref]
  2. 2016 - System level design and performances of the ITER radial neutron camera
  3. 2011 - Combined unfolding and spatial inversion of neutron camera measurements for ion temperature profile determination in ITER [Crossref]
  4. 2012 - Neutron measurements in ITER using the radial neutron camera [Crossref]
  5. 2009 - CAD-based interface programs for fusion neutron transport simulation [Crossref]
  6. 2018 - The ITER tokamak neutronics reference model C-model [Crossref]
  7. 2022 - Nuclear analyses for the assessment of the loads on the ITER Radial Neutron Camera in-port system and evaluation of its measurement performances [Crossref]
  8. 2019 - The ITER radial neutron camera in-port system: nuclear analyses in support of its design development [Crossref]

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