Development of new UV-I. I. Cerenkov Viewing Device
- Central Research Inst. of Electric Power Industry, Tokyo (Japan). Communication and Information Research Lab.
The Cerenkov glow images from boiling-water reactors (BWR) and pressurized-water reactors (PWR) irradiated fuel assemblies are generally used for inspections. However, sometimes it is difficult or impossible to identify the image by the conventional Cerenkov Viewing Device (CVD), because of the long cooling time and/or low burnup. Now a new UV-I.I. (Ultra-Violet light Image Intensifier) CVD has been developed, which can detect the very weak Cerenkov glow from spent fuel assemblies. As this new device uses the newly developed proximity focused type UV-I.I., Cerenkov photons are used efficiently, producing better quality Cerenkov glow images. Moreover, since the image is converted to a video signal, it is easy to improve the signal to noise ratio (S/N) by an image processor. The new CVD was tested at BWR and PWR power plants in Japan, with fuel burnups ranging from 6,200--33,000 MWD/MTU (megawatt days per metric ton of uranium) and cooling times ranging from 370 to 6,200 d. The tests showed that the new CVD is superior to the conventional STA/CRIEPI CVD, and could detect very feeble Cerenkov glow images using an image processor.
- OSTI ID:
- 7237135
- Journal Information:
- IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (United States), Vol. 41:1 Pt2; ISSN 0018-9499
- Country of Publication:
- United States
- Language:
- English
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98 NUCLEAR DISARMAMENT, SAFEGUARDS, AND PHYSICAL PROTECTION
BWR TYPE REACTORS
SPENT FUEL ELEMENTS
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SPENT FUEL STORAGE
IAEA SAFEGUARDS
CHERENKOV RADIATION
IMAGE PROCESSING
IMAGES
NUCLEAR MATERIALS MANAGEMENT
OPTICAL FILTERS
PERFORMANCE
ULTRAVIOLET RADIATION
ELECTROMAGNETIC RADIATION
ENRICHED URANIUM REACTORS
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FUEL ELEMENTS
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THERMAL REACTORS
WATER COOLED REACTORS
WATER MODERATED REACTORS
210100* - Power Reactors
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210200 - Power Reactors
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055001 - Nuclear Fuels- Safeguards
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