Tests under irradiation of optical fibers and cables devoted to corium monitoring in case of severe accident in a Nuclear Power Plant
| Autor: | G. Cheymol, L. Remy, P. Le Tutour, Y. Ouerdane, V. Dauvois, L. Maurin, Hicham Maskrot, S. Rougeault, V. Arounassalame, P. Ferdinand, N. Huot |
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| Přispěvatelé: | Service d'études analytiques et de réactivité des surfaces (SEARS), Département de Physico-Chimie (DPC), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Laboratoire Capteurs Fibres Optiques (LCFO), Département Métrologie Instrumentation & Information (DM2I), Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Direction de Recherche Technologique (CEA) (DRT (CEA)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Laboratoire d'Intégration des Systèmes et des Technologies (LIST (CEA)), Service d'Etudes du Comportement des Radionucléides (SECR), SEROS (SEROS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Laboratoire Hubert Curien (LHC), Institut d'Optique Graduate School (IOGS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), ANR-11-RSNR-0007,DISCOMS,Capteurs Distribués pour la Surveillance du Corium(2011) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Optical fiber optical fibers nuclear power plant QC1-999 distributed measurement radiolysis 02 engineering and technology Corium Radiation Induced Attenuation 01 natural sciences law.invention 020210 optoelectronics & photonics neutron Neutron flux law sensor 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Neutron Irradiation cable [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det] Composite material Fiber Bragg Grating Reactor pressure vessel nuclear instrumentation instrumentation 010308 nuclear & particles physics Attenuation Physics carbon coating layer hydrogen diffusion Distributed and Quasi-distributed sensing neutrons corium monitoring gamma-rays Radioactivity Optical Fiber Sensor rad-hard optical fiber Electromagnetic shielding radiation effects [SPI.OPTI]Engineering Sciences [physics]/Optics / Photonic gamma ionizing radiation |
| Zdroj: | EPJ Web of Conferences EPJ Web of Conferences, 2020, ANIMMA 2019 – Advancements in Nuclear Instrumentation Measurement Methods and their Applications, 225, pp.08006. ⟨10.1051/epjconf/202022508006⟩ EPJ Web of Conferences, Vol 225, p 08006 (2020) |
| ISSN: | 2100-014X |
| Popis: | The DISCOMS project, which stands for “DIstributed Sensing for COrium Monitoring and Safety”, considers the potential of distributed sensing technologies, based on remote instrumentations and Optical Fiber Sensing cables embedded into the concrete floor under the reactor vessel, to monitor the status of this third barrier of confinement. This paper focuses on the selection and testing of singlemode (SM) optical fibers with limited RIA (Radiation Induced Attenuation) to be compliant with remote distributed instruments optical budgets, the ionizing radiation doses to sustain, and their reduction provided by the concrete basemat shielding. The tests aimed at exposing these fibers and the corresponding sensitive optical cables, to the irradiation doses expected during the normal operation of the reactor (up to 60 years for the European Pressurized Reactor), followed by a severe accident. Several gamma and mixed (neutron-gamma) irradiations were performed at CEA Saclay facilities: POSÉÏDON irradiator and ISIS reactor, up to a gamma cumulated dose of about 2 MGy and fast neutron fluence (E > 1 MeV) of 6 x 1015 n/cm2. The first gamma test permitted to assess the RIA at various optical wavelengths, and to select three radiation tolerant singlemode fibers (RIA < 5 dB/100 m, at 1550 nm operating wavelength). The second one was performed on voluminous strands of sensitive cables encapsulating the selected optical fibers, up to approximately the same accumulated dose, at two temperatures: 30°C and 80°C. A significant increase of the RIA, without any saturation tendency, appeared for fibers inserted into cables, correlated with the increase of the hydroxyl attenuation peak at 1380 nm. Molecular hydrogen generated by the radiolysis of compounds of the cable is at the origin of this phenomenon. A third gamma irradiation run permitted to measure the radiolytic hydrogen production yield of some compounds of a dedicated temperature cable sample. The efficiency of a carbon coating layer over the silica cladding, acting as a barrier against hydrogen diffusion, was also successfully confirmed. Finally, the efficiency of this carbon coating layer has also been tested under neutron irradiation, then qualified as a protection barrier against hydrogen diffusion in the optical fiber cores. |
| Databáze: | OpenAIRE |
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