NDLI: Development of Observation Techniques in Reactor Vessel of Experimental Fast Reactor Joyo

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Takamatsu, Misao Imaizumi, Kazuyuki Nagai, Akinori Sekine, Takashi Maeda, Yukimoto
Copyright Year	2009
Abstract	During the investigation of an incident that occurred with the experimental fast reactor Joyo, In-Vessel Observations (IVO) using a standard Video Camera (VC) and a Radiation-Resistant Fiberscope (RRF) took place at (1) the top of the Sub-Assemblies (S/As) and the In-Vessel Storage rack (IVS), (2) the bottom face of the Upper Core Structure (UCS) under the condition with the level of sodium at −50 mm below the top of the S/As. A simple 6 m overhead view of each S/A, through the fuel handling or inspection holes etc, was photographed using a VC fixed to the Rotating-Plug (R/P) with the acrylic panel for making observations of the top of S/As and IVS. About 650 photographs were required to create a composite photograph of the top of the entire S/As and IVS, and a resolution was estimated to be approximately 1mm. In order to observe the bottom face of the UCS, a Remote Handling Device (RHD) equipped with RRFs (approximately 13 m long) was specifically developed for Joyo with a tip that could be bent into an L-shape and inserted into the 70 mm gap between the top of the S/As and the bottom of the UCS. A total of about 35,000 photographs were needed for the full investigation. Regarding the resolution, the sodium flow regulating grid of 0.8mm in thickness could be discriminated, and the base of thermocouple sleeves 6 mm in diameter located 450 mm above the top of S/As were also clearly observed. In both types of observations, it was confirmed that lighting adjustments play a critical role. Particularly in narrow space observations, scattered lighting with automatic dimming controlled light source was available for achieving close observations of the in-vessel structures. In addition to the successful result of the incident investigation, these experiments provided valuable insights for use in further improving and verifying in-vessel observation techniques in Sodium cooled Fast Reactors (SFRs).
Sponsorship	Nuclear Engineering Division
Starting Page	793
Ending Page	802
Page Count	10
File Format	PDF
ISBN	9780791843512
DOI	10.1115/ICONE17-75088
e-ISBN	9780791838525
Volume Number	Volume 1: Plant Operations, Maintenance, Engineering, Modifications and Life Cycle; Component Reliability and Materials Issues; Next Generation Systems
Conference Proceedings	17th International Conference on Nuclear Engineering
Language	English
Publisher Date	2009-07-12
Publisher Place	Brussels, Belgium
Access Restriction	Subscribed
Subject Keyword	Reactor vessels Vessels Thermocouples Inspection Video cameras Fuels Flow (dynamics) Light sources Composite materials Storage Sodium Radiation (physics) Fast neutron reactors Resolution (optics) Shapes Sodium fast reactors
Content Type	Text
Resource Type	Article

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