Vertical variations of flux parameters in irradiation channels at the TRIGA Mark II reactor of Pavia
| Autor: | Giancarlo D'Agostino, M. Di Luzio, Massimo Oddone, Andrea Salvini |
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| Rok vydání: | 2019 |
| Předmět: |
Spectral index
Materials science Astrophysics::High Energy Astrophysical Phenomena 020209 energy Energy Engineering and Power Technology 02 engineering and technology 010501 environmental sciences 01 natural sciences TRIGA Nuclear physics Core (optical fiber) Flux (metallurgy) Nuclear Energy and Engineering Neutron flux Thermal 0202 electrical engineering electronic engineering information engineering Irradiation Neutron activation analysis Safety Risk Reliability and Quality Waste Management and Disposal 0105 earth and related environmental sciences |
| Zdroj: | Progress in Nuclear Energy. 113:247-254 |
| ISSN: | 0149-1970 |
| Popis: | The knowledge of neutron flux parameters, both in terms of value and gradient, in irradiation channels of nuclear reactors is required to avoid biased results when applying Neutron Activation Analysis. To this aim, the Au Zr bare triple-monitor method with the addition of Lu as a temperature monitor was used to collect experimental data in irradiation channels of three facilities at the TRIGA Mark II reactor of Pavia. Twenty-four monitors were placed in as many positions to determine the vertical variations of the neutron flux parameters. The results obtained in three different activation experiments pointed out a decrease of the conventional fluxes up to 70% in some cases. Nevertheless, the epithermal neutron flux correction factor, the thermal to epithermal neutron flux ratio and the modified spectral index were constant throughout the entire length of the channels within the core whereas trends were identified in channels outside the core. |
| Databáze: | OpenAIRE |
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