Simultaneous Measurements of Nuclear Heating and Thermal Neutron Flux Obtained with the CALMOS-2 Measurement Device inside the OSIRIS Reactor
| Autor: | Eric Bouard, Laurent Salmon, Valerie Lepeltier, Jean-Marie Guyot, Hubert Carcreff |
|---|---|
| Přispěvatelé: | CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), amplexor, amplexor |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
[PHYS.NUCL] Physics [physics]/Nuclear Theory [nucl-th]
Nuclear heating Materials science biology [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th] [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex] Nuclear engineering Calorimetry [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] biology.organism_classification 7. Clean energy Sample (graphics) sample 030218 nuclear medicine & medical imaging Thermal neutron flux 03 medical and health sciences 0302 clinical medicine Measurement device OSIRIS reactor calorimetric cell Osiris calorimetry in-core measurements |
| Zdroj: | International Symposium on Reactor Dosimetry (ISRD-16) International Symposium on Reactor Dosimetry (ISRD-16), May 2017, Santa Fe, United States |
| Popis: | International audience; Nuclear heating inside an MTR reactor needs to be known in order to design and to run irradiation experiments which have to fulfill target temperature constraints. To improve the nuclear heating knowledge, an innovative calorimetric system CALMOS has been studied, manufactured and tested for the 70MWth OSIRIS reactor operated by CEA. This device is based on a mobile calorimetric probe which can be inserted in any in-core experimental location and can be moved axially from the bottom of the core to 1000mm above the core mid-plane. Analysis of obtained results and advantages brought by the first CALMOS-1 mobile equipment have been already presented. However, some difficulties appeared with this first version. A thermal limitation in the cell did not allow to monitor nuclear heating up to the 70MW nominal power, and some significant discrepancies were observed at high heating rates between results deduced from the calibration and those obtained by the zero method. Feedback based, the new CALMOS-2 calorimeter has been designed both for extending the heating range up to 13W.g-1 and improving the zero method measurement thanks to a 4-wires technique. In addition, the CALMOS-2 calorimeter has been designed as a real operational measurement system, well suited to characterize and to follow the radiation field evolution throughout the reactor cycle. To meet this requirement, a programmable system associated with a specific software allows automatic complete cell mobility in the core, the data acquisition and the measurements processing. This paper presents the analysis of results collected during the 2015 comprehensive measurement campaign carried out with the new CALMOS-2 prototype. The 4-wires technique was tested up to around a 4 W.g-1 heating level and allowed to quantify discrepancies between zero and calibration methods. Thermal neutron flux and nuclear heating measurements from CALMOS-1 and CALMOS-2 are compared. Thermal neutron flux distributions, obtained with the Self-Power Neutron Detector suited to the CALMOS-2 calorimetric cell, are compared with those obtained with current devices. Finally, this analysis tends to emphasize advantages brought by the human machine interface automation, which deeply refined the profiles definition. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|