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Report No.
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Out-pile tests for improved type rabbits in JMTR

Kitagishi, Shigeru  ; Isozaki, Futoshi; Takita, Kenji ; Aoyama, Masashi; Matsui, Yoshinori 

As one of the production of radioisotopes, JMTR has a plan to produce $$^{99}$$Mo which is a parent nuclide of $$^{rm 99m}$$Tc. The new hydraulic-rabbit-irradiation-facility is carried out to be set up in the preparation of the $$^{99}$$Mo production facility. For the expansion of use, the new facility was designed to be able to irradiate rabbits more than it used to be. However, it takes more than about ten days to assemble the rabbit. For this reason, it is required shortening of the assembly period. The improved type of rabbit, which was developed to shorten the assembly period in JRR-3, was focused. And, out-pile tests were carried out for research of the fabrication of the improved type rabbit and the endurance performance under the usage environment in JMTR. In these tests, first, the assembly device for the improved type of rabbit was designed and fabricated, and the fabrication test was carried out using the assembly device. Next, the endurance performance tests were carried out using mock-up rabbits. From the results of these tests, there were bright prospects of the manufacturability of the improved type of rabbit had good sealing performance and utilizing in the irradiation test of JMTR.

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