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炉プール・ダイヤフラムシールの健全性調査

Verification on reliability of diaphragm seal

井手 広史; 作田 善幸; 塙 善雄; 辻 智之; 坪井 一明; 長尾 美春; 宮澤 正孝

Ide, Hiroshi; Sakuta, Yoshiyuki; Hanawa, Yoshio; Tsuji, Tomoyuki; Tsuboi, Kazuaki; Nagao, Yoshiharu; Miyazawa, Masataka

JMTR原子炉本体は、原子炉圧力容器,炉心及び炉プールから構成され、JMTR原子炉プール最下部には原子炉プール水の漏えいを防止するとともに、原子炉圧力容器内の圧力及び温度変化による圧力容器自体の伸縮を吸収するためのステンレス鋼製ダイヤフラムシール(外径2.6m,内径2m,厚さ1.5mm)が設置されている。JMTRの改修に先立ち、ダイヤフラムシールの健全性を確認するため、水中カメラ付き堆積物回収装置を開発し、外観検査を行った。外観検査の結果、有害な傷,錆びは確認されず、ダイヤフラムシールの健全性が確認できた。今後も本装置によって定期的に点検を行うことで、その健全性の維持に努める。

The main body of the JMTR is composed of reactor pressure vessel, core and reactor pool. At the bottom of the reactor pool, the Diaphragm-seal (2.6m outer diameter, 2m inner diameter, thickness 1.5mm) of the JMTR made of stainless steel is installed to prevent the water leak of the reactor pool and to absorb the expansion of the reactor pressure vessel due to pressure and temperature changes. Prior to the refurbishment of the JMTR, the inspection device which is a deposition-collection apparatus with underwater-camera was developed, and the visual inspection was carried out to confirm the soundness of the diaphragm-seal. As a result, harmful flaws and/or corrosions were not inspected in the visual inspection, and the soundness of the diaphragm seal was confirmed. In future, the long-term integrity of the diaphragm-seal will could be achieved by conducting the periodic inspection.

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