Measurement of flux spectra and tritium production rates in an iter TBM mock-up irradiated with 14 MEV neutrons

A. Klix, P. Batistoni, U. Fischery, H. Freiesleben, D. Leichtle, K. Seidel, S. Unholzer

Research output: Contribution to journalArticle


A mock-up of the European Helium-Cooled Pebble Bed TBM was irradiated with DT neutrons in pulsed and continuous mode at the Fusion Neutronics Laboratory of the University of Technology Dresden. The aim was to measure fast neutron and gamma-ray flux spectra as well as time-of-arrival spectra of the slow neutron flux. The results of the experiments were analysed by the Monte Carlo code MCNP and nuclear data from the European Fusion File (EFF-3), and the Fusion Evaluated Nuclear Data Library (FENDL-2.0/2.1). It was found that the calculation of the fast neutron flux above 3 MeV tends to overestimate while the gammaray flux and slow neutron flux in two measurement positions in the mock-up was underestimated. The mock-up was also irradiated at FNG/ENEA Frascati to measure tritium breeding rates by means of small Li2CO3pellet detectors inserted into the breeding layers. The breeding experiment was analysed at FZ Karlsruhe with emphasis on determining sensitivities of the TPR to relevant cross section uncertainties of all materials in the mock-up. It was found that the TPR calculation shows a tendency to underestimate. From the sensitivity analysis it was found that the total TPR is most sensitive to the elastic scattering in Be and the7Li(n,αT) reaction.
Original languageEnglish
Pages (from-to)776 - 780
Number of pages5
JournalFusion Science and Technology
Issue number4
Publication statusPublished - 2007
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear and High Energy Physics
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Klix, A., Batistoni, P., Fischery, U., Freiesleben, H., Leichtle, D., Seidel, K., & Unholzer, S. (2007). Measurement of flux spectra and tritium production rates in an iter TBM mock-up irradiated with 14 MEV neutrons. Fusion Science and Technology, 52(4), 776 - 780.