Critical element development of double seal door for tritium containment. - Kanamori, Naokazu; Japan Atomic Energy Research Institute^pJP; Kakudate, Satoshi; Oka, Kiyoshi; Nakahira, Masataka; Taguchi, Kou; Obara, Kenjiro; Tada, Eisuke; Shibanuma, Kiyoshi; Seki, Masahiro (Ibaraki-ken : Japan Atomic Energy Research Institute, 1994)