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電子・$$gamma$$線照射施設の運転・整備・利用状況

Operation and utilization of the electron accelerator and the $$gamma$$-ray irradiation facilities

上松 敬; 宇野 定則; 花屋 博秋; 山縣 諒平; 清藤 一; 長尾 悠人; 山崎 翔太; 川島 郁男*; 八木 紀彦*; 高木 雅英*; 松崎 慎也*

Agematsu, Takashi; Uno, Sadanori; Hanaya, Hiroaki; Yamagata, Ryohei; Seito, Hajime; Nagao, Yuto; Yamasaki, Shota; Kawashima, Ikuo*; Yagi, Norihiko*; Takagi, Masahide*; Matsuzaki, Shinya*

平成26年度は、$$gamma$$線照射施設は順調に稼働したが、電子加速器は頻発した故障のため稼働率は60%であった。運転時間は、電子加速器では746時間、コバルト第1棟では19,907時間、コバルト第2棟では13,831時間、食品棟では7,293時間であった。東京電力福島第一原子力発電所の事故に対する復興対応関連課題については、電子加速器では35回、$$gamma$$線照射施設で172回の利用があった。主要なメンテナンスについては、電子加速器では高電圧絶縁支柱故障修理、絶縁ガス漏れ修理、SF$$_{6}$$ガスの精製など、コバルト2棟では定期整備、食品棟では線源の補充をそれぞれ行った。

The $$gamma$$-ray irradiation facility have been operated smoothly in FY2014, on the other hand, the rate of operation was down to 60% compared to FY2013 for troubles at the electron accelerator. The annual operation time in FY 2014 for the electron accelerator, the first, the second cobalt irradiation facility and food irradiation facility are 746h, 19,907h, 13,831h and 7,293h, respectively. Typical maintenance is as follows. The isolation pillar of high-voltage circuit, leakage of isolation gas were repaired, SF$$_{6}$$ isolation gas was purified at the electron accelerator. The periodic maintenance was done for the second irradiation facility. New pieces of $$^{60}$$Co sources were purchased and loaded to the food irradiation facility.

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