Development of radiation-resistant optical fiber for application to observation and laser spectroscopy under high radiation dose

Ito, Chikako; Naito, H.; Nishimura, Akihiko; Ohba, Hironori; Wakaida, Ikuo; Sugiyama, A.; Chatani, Keiji

doi:10.1080/00223131.2014.924883

Cited by 42 publications

(19 citation statements)

References 6 publications

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“…In addition, we are proposing an in-vessel inspection technique by visual observation [5], ultimate analysis by laser induced breakdown spectroscopy (LIBS) with near-infrared light [5,7] and radiation monitoring using scintillator with red or near-infrared wavelength light emission. The complex remote sensing system requires a high radiation resistant optical fiber for visible and near-infrared light to transmit image signals, laser beam, emission light by LIBS and scintillation by gamma rays.…”

Section: Resultsmentioning

confidence: 99%

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Development of Remote Sensing Technique Using Radiation Resistant Optical Fibers under High-Radiation Environment

Ito

Naito

Igarashi

et al. 2019

Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)

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A high-radiation resistant optical fiber has been developed in order to investigate the interiors of the reactor pressure vessels and the primary containment vessels at the Fukushima Daiichi Nuclear Power Station. The tentative dose rate in the reactor pressure vessels is assumed to be up to 1 kGy/h. We developed a radiation resistant optical fiber consisting of a 1000 ppm hydroxyl doped pure silica core and 4 % fluorine doped pure silica cladding. We attempted to apply the optical fiber to remote imaging technique by means of fiberscope. The number of core image fibers was increased from 2000 to 22000 for practical use. The transmissive rate of infrared images was not affected after irradiation of 1 MGy. No change in the spatial resolution of the view scope by means of image fiber was noted between pre-and post-irradiation. We confirmed the applicability of the probing system, which consists of a view scope using radiation-resistant optical fibers.

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Section: Resultsmentioning

confidence: 99%

“…No change in infrared images was noted between pre-and post-irradiation. The cladding thickness of the tested fiber was approximately 3.3 μm for visible light only [5].…”

Section: Radiation Resistant Image Fiber For Practical Usementioning

confidence: 99%

Development of Remote Sensing Technique Using Radiation Resistant Optical Fibers under High-Radiation Environment

Ito

Naito

Igarashi

et al. 2019

Proceedings of the Second International Symposium on Radiation Detectors and Their Uses (ISRD2018)

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“…However, although optical fiber is an essential equipment for this process, it is common knowledge that in the case of laser cutting, the optical fiber exhibits color center due to γ ‐ray irradiation, thereby losing its optical transparency [11]. Notably, previous research has clarified that a color center is generated by γ ‐ray irradiation of approximately ∼10 6 Gy [12]. Therefore, it remains unclear whether the performance of the original laser cutting method can be effectively leveraged in an accident‐damaged nuclear reactor, where the interior of the containment vessel is contaminated with high‐level radiation.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopic Measurement of Arc‐Discharge Argon Plasma Plume Injected into Water

Suzuki

Matsuoka

Hirotani

et al. 2021

IEEJ Transactions Elec Engng

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The electron temperature and the density of argon arc plasma plume injected into water were observed through optical emission spectroscopic measurement. Argon arc plasma jets were generated with a DC arc current of 40–200 A by a non‐transferred arc discharge plasma torch under atmospheric pressure, and ejected through a nozzle on the anode into water or gas‐phase argon. The electron temperature of the plasma plume was determined by the Boltzmann plot with line intensity measurement of atomic argon lines, while the electron density is examined with the Stark broadening measurement of Hα line. It was found that the electron temperature increased from approximately 6500–8000 K, and the electron density also increased up to the order of 1016cm−3, as the discharge current increased for the underwater argon arc plasma plume, both of which were observed at 20 mm in the downward direction from the plasma generator nozzle. In addition, the electron temperature of the underwater plasma plume was slightly lower than that of the gas‐phase argon plasma plume, while the electron density of the underwater plasma was slightly higher than that of the gas‐phase plume. Longitudinal variation of the electron temperature and density of the underwater plasma plume was also observed, and the lowering rate was found to depend on the arc discharge current. © 2021 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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“…Thus they are not easily transferable to power-resolved imaging or operational reactors that require assay of the neutron emission, let alone the immediate aftermath post-accident. There have been complementary reports of systems for internal inspection of failed reactor plant 4 but these are intrusive and provide for the survey of fuel debris inside reactor plant once access to a stricken reactor is achieved. In terms of imaging the stricken reactor itself, the most evolved technique is the use of cosmic-ray muons 5 that can non-intrusively reveal the distribution of fuel debris in a reactor, though not the reactivity profile.…”

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confidence: 99%

High-intensity power-resolved radiation imaging of an operational nuclear reactor

et al. 2015

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Knowledge of the neutron distribution in a nuclear reactor is necessary to ensure the safe and efficient burnup of reactor fuel. Currently these measurements are performed by in-core systems in what are extremely hostile environments and in most reactor accident scenarios it is likely that these systems would be damaged. Here we present a compact and portable radiation imaging system with the ability to image high-intensity fast-neutron and gamma-ray fields simultaneously. This system has been deployed to image radiation fields emitted during the operation of a TRIGA test reactor allowing a spatial visualization of the internal reactor conditions to be obtained. The imaged flux in each case is found to scale linearly with reactor power indicating that this method may be used for power-resolved reactor monitoring and for the assay of ongoing nuclear criticalities in damaged nuclear reactors.

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Development of radiation-resistant optical fiber for application to observation and laser spectroscopy under high radiation dose

Cited by 42 publications

References 6 publications

Development of Remote Sensing Technique Using Radiation Resistant Optical Fibers under High-Radiation Environment

Development of Remote Sensing Technique Using Radiation Resistant Optical Fibers under High-Radiation Environment

Spectroscopic Measurement of Arc‐Discharge Argon Plasma Plume Injected into Water

High-intensity power-resolved radiation imaging of an operational nuclear reactor

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