Absolute activation reaction rate (RR) measurements were carried out in a mock-up of the inboard shield of the International Thermonuclear Experimental Reactor (ITER) reactor at the Frascati neutron generator (FNG). Since the mock-up has a thickness of about 1 m, a flux gradient of six orders of magnitude is observed for the high-energy part of the neutron spectrum. This required, for the high threshold reaction (e.g.93Nb(n,2n)92Nb) to be measured, the use of ultra-low background germanium detectors. These detectors allowed activity to be measured, even in the deepest positions of the mock-up, with a total error lower than ± 15%. The measured reaction rates (E) are also compared with the results of the transport calculation (C) performed using the MCNP code and the FENDL-1 library. The C/E ratios for some of the measured quantities are reported. These results show a systematic underestimation of the calculated quantities with respect to the measurements. The underestimation is as high as 30% in the deepest positions. © 1998 Elsevier Science S.A. All rights reserved.
|Pages (from-to)||255 - 260|
|Number of pages||6|
|Journal||Fusion Engineering and Design|
|Publication status||Published - 3 Sep 1998|
All Science Journal Classification (ASJC) codes
- Civil and Structural Engineering
- Materials Science(all)
- Nuclear Energy and Engineering
- Mechanical Engineering
Angelone, M., Batistoni, P., Petrizzi, L., & Pillon, M. (1998). Neutronics experiment on a mock-up of the ITER shielding system at the Frascati neutron generator (FNG). Fusion Engineering and Design, 42(1-4), 255 - 260.