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HTTR起動用中性子源用の輸送容器の開発

Development of transportation container for neutron startup source of High Temperature Engineering Test Reactor (HTTR)

島崎 洋祐; 澤畑 洋明; 柳田 佳徳; 篠原 正憲; 川本 大樹; 高田 昌二

Shimazaki, Yosuke; Sawahata, Hiroaki; Yanagida, Yoshinori; Shinohara, Masanori; Kawamoto, Taiki; Takada, Shoji

HTTR(高温工学試験研究炉)では起動用中性子源として、$$^{252}$$Cf(3.7GBq$$times$$3個)を炉内に装荷し、約7年を目途に交換している。中性子源の中性子源ホルダへの装荷及び輸送物の製作は、販売業者のホットセル内で行われ、その後、HTTRまで輸送される。中性子源ホルダの制御棒案内ブロックからの取出・装荷は、HTTRのメンテナンスピット内で行う。前回までの中性子源交換作業において、輸送容器に係る中性子源ホルダの取扱い上のリスクとして以下が確認された。(1)作業員の被ばくのリスク、(2)中性子源ホルダの誤落下リスク。そこで、そのリスクを低減し、かつ、製造から20年経過した従来の輸送容器をオーバーホールして使用し続ける場合と同程度のコストで、従来の輸送容器と同じA型輸送物の基準を満足することができる、HTTRの中性子源専用の新たな輸送容器を製作した。

The High Temperature Engineering Test Reactor (HTTR) has three neutron startup sources (NSs) in the reactor core, each of which consists of $$^{252}$$Cf with 3.7GBq The NSs are exchanged at the interval of approximately 7 years. The NS holders including NSs are transported from the dealer's hot cell to the reactor facility of HTTR using a transportation container. The loading work of NS holders to the Control Rod guide blocks is subsequently carried out in the fuel handling machine maintenance pit of HTTR. Following technical issues were extracted from the experiences in the past two exchange works of NSs to develop a safety handling procedure; (1) The reduction and prevention of radiation exposure of workers. (2) The exclusion of falling of NS holder. Then, a new transportation container special to the NSs of HTTR was developed to solve the technical issues while keeping the cost as low as that for overhaul of conventional container and satisfying the regulation of A type transportation package.

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