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Report No.

Replacement of the moderator cell unit of JRR-3's cold neutron source facility

Hazawa, Tomoya; Nagahori, Kazuhisa; Kusunoki, Tsuyoshi

The moderator cell containing liquid hydrogen is made of stainless steel. The material irradiation lifetime is limited to 7 years due to irradiation brittleness. The survey and design for a renewal moderator cell were conducted with a view to domestic production by the JAEA. It was fabricated and replaced by a domestic company, and the replacement work was completed in February, 2006. Characteristic was measured after exchange, and it had the same performance as the moderator cell made in France, and succeeded in making to domestic production.



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