Development of in-reactor fuel behavior observation system.

概要

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A great effort has been made to develop an optical apparatus for direct observation of transient fuel behavior in a water environment in actual in-reactor experiments. There are many difficulties to be overcome, such as high radiation fluence, limited space, shock pres- sure generation, fission products release.<BR>Through the extensive irradiation tests of various kinds of glasses, optical fibers and film and ex-reactor simulation tests, an in-reactor fuel behavior observation system was designed and fabricated for NSRR (Nuclear Safety Research Reactor) experiments. The system consists of a test capsule and connected upper containments. As an image guide is installed inside the containment a periscope with non-browning lenses whose lower part is covered by a stainless steel pipe with anti-shock window made of quartz in the test capsule, and the top of the periscope is connected with a high speed camera. A high intense lamp is immersed directly into water in the capsule as a light source. The motion pictures taken by the system in the NSRR experiments could record clearly Cerenkov glow, states of red hot fuel rod, coolant boiling, cladding melting and cracking, bubble formation, and so on which we had never seen before.
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