دورية أكاديمية
In-Pile Qualification of the Fast-Neutron-Detection-System
| العنوان: | In-Pile Qualification of the Fast-Neutron-Detection-System |
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| المؤلفون: | Fourmentel D., Villard J-F., Destouches C., Geslot B., Vermeeren L., Schyns M. |
| المصدر: | EPJ Web of Conferences, Vol 170, p 04025 (2018) |
| بيانات النشر: | EDP Sciences |
| سنة النشر: | 2018 |
| المجموعة: | Directory of Open Access Journals: DOAJ Articles |
| مصطلحات موضوعية: | Nuclear Measurements, Fission Chamber, Reactor Instrumentation, Physics, QC1-999 |
| الوصف: | In order to improve measurement techniques for neutron flux assessment, a unique system for online measurement of fast neutron flux has been developed and recently qualified in-pile by the French Alternative Energies and Atomic Energy Commission (CEA) in cooperation with the Belgian Nuclear Research Centre (SCK•ECEN). The Fast-Neutron-Detection-System (FNDS) has been designed to monitor accurately high-energy neutrons flux (E > 1 MeV) in typical Material Testing Reactor conditions, where overall neutron flux level can be as high as 1015 n.cm-2.s-1 and is generally dominated by thermal neutrons. Moreover, the neutron flux is coupled with a high gamma flux of typically a few 1015 γ.cm-2.s-1, which can be highly disturbing for the online measurement of neutron fluxes. The patented FNDS system is based on two detectors, including a miniature fission chamber with a special fissile material presenting an energy threshold near 1 MeV, which can be 242Pu for MTR conditions. Fission chambers are operated in Campbelling mode for an efficient gamma rejection. FNDS also includes a specific software that processes measurements to compensate online the fissile material depletion and to adjust the sensitivity of the detectors, in order to produce a precise evaluation of both thermal and fast neutron flux even after long term irradiation. FNDS has been validated through a two-step experimental program. A first set of tests was performed at BR2 reactor operated by SCK•CEN in Belgium. Then a second test was recently completed at ISIS reactor operated by CEA in France. FNDS proved its ability to measure online the fast neutron flux with an overall accuracy better than 5%. |
| نوع الوثيقة: | article in journal/newspaper |
| اللغة: | English |
| تدمد: | 2100-014X |
| العلاقة: | https://doi.org/10.1051/epjconf/201817004025Test; https://doaj.org/toc/2100-014XTest; https://doaj.org/article/f38410be668c435f883d9a59fc6c90f2Test |
| DOI: | 10.1051/epjconf/201817004025 |
| الإتاحة: | https://doi.org/10.1051/epjconf/201817004025Test https://doaj.org/article/f38410be668c435f883d9a59fc6c90f2Test |
| رقم الانضمام: | edsbas.4866A021 |
| قاعدة البيانات: | BASE |
Full Text Finder | تدمد: | 2100014X |
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| DOI: | 10.1051/epjconf/201817004025 |