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Operation test result of a radio-proof cryogenic valve under cobalt 60 irradiation

コバルト60照射下での耐放射線低温自動弁の実駆動試験

槙田 康博*; 大畠 洋克*; 岡村 崇弘*; 荻津 透*; 中本 建志*; 木村 誠宏*; 出崎 亮; 後閑 麻代*; 森下 憲雄

Makida, Yasuhiro*; Ohata, Hirokatsu*; Okamura, Takahiro*; Ogitsu, Toru*; Nakamoto, Tatsushi*; Kimura, Nobuhiro*; Idesaki, Akira; Gokan, Mayo*; Morishita, Norio

J-PARCニュートリノビームラインでは超伝導マグネットが積算で最大1MGyの放射線に曝されることが予測されている。マグネットと同様クライオスタットも耐放射線性を有しておかなければならず、1MGyを目標にクライオスタット部品の選定や機器開発を進めている。材料選定やポジショナ分離など対策を施した自動弁及び安全弁に関して、$$gamma$$線照射下での動作試験を行い、これらの自動弁及び安全弁は1MGy以上の耐放射線性を有することを明らかにした。

A string of superconducting magnets is to be set at an arc section of the J-PARC neutrino beam line. To keep the magnets at superconducting condition, a helium cryogenic facility is to be constructed. Parts of cryogenic devices are located beside the magnets, so thier resistance to radiation with predicted dose of 1 MGy in maximum must be assured. A cryogenic control valve is one of the active devices used in the radio-active area, and its radio-proof characteristics is improved by (1) exchaging intolerant materials by proof ones, (2) moving the feed back control circuit unit including electronics from the valve body to a low radio-active area. Two prototype valves, a tuning valve and a Gauzky relief valve, have been prepared and have been tested by using the Cobalt 60 irradiation facility in JAEA. Actual operations of the both prototypes have been checked at the irradiation test bench, and they were successfully operated after irradiation of 1 MGy.

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