1. 緒言平成21年4月に確認された東海再処理施設の海中放 出設備の漏えい事象は、漏えい箇所が海底埋設の放出 管であった。漏えいの原因は、放出管の施工時に損傷 し、経年変化として損傷箇所に電気防食で発生した水 素が影響したことで水素脆性割れが起こり、き裂が発 生、さらには水素誘起割れによりき裂が進展し貫通し たことによるものと推定した。損傷箇所に水素脆性割れが生じる原因となった水素 は電気防食によるものであり、このときの防食電位と 水素発生の関係等の調査を行った。この結果、損傷が 素が影響したことで水素脆......
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Liquid leakage from the sea release pipe of the Tokai reprocessing plant estigation into the cause of the leak (3): Preventive measures against recurrences and the management metho - Investigation into the cause of the leak (3): Preventive measures against recurrences and the management method

At the Tokai reprocessing plant, release of the low radioactive waste liquid to the ocean is carried out using sea release facilities. It was found that there was a leak point on the sea release facilities. Therefore, surveillance and confirmation were performed and the leak point was identified. The leak part was cut and the part was then collected to investigate the cause of the leak. As a result, it was estimated that the leak oc curred after the pipe was mechanically damaged and a successive metallurg...
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Liquid leakage from the sea release pipe of the Tokai reprocessing plant -Summary of ocean-releasing facilities and the leak phenomenon -

A leakage was found on the sea release pipe of the Tokai reprocessing plant The leak point was discovered in a part buried in the sea floor The damaged part was cut and was collected, and investigation into the cause was subsequently carried out As a result, external force and hydrogen embrittlement were estimated to be the cause that produced a crack on the pipe As restoration of the leak part, a construction method using a coupling technique was proposed considering steady sealability on the restore...
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Liquid leakage from the sea release pipe of the Tokai reprocessing plant- Restoration of the leak point at the see release pipe --

There are plural facilities having a radiation controlled area in the Tokai reprocessing plant, and an interruptible power supply system which considered a blac kout is necessary for the power supply to eachility from the viewpoint of radiological management and nuclear material containment. In addition, at the ne of th e power supplying abnormality, intelligence gathering is necessary for prompt measures and toration. In this report, the intensive monitoring system, which aime d for the unification of the...
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The construction of an intensive monitoring system for power supply stations in the Tokai reprocessing plant

Uninterruptible power supply systems are installed in the Tokai reprocessing plant in preparation for the emergency case the commercial power supply is stopped by an accidental or intentional interruption in the supply of electricity. The terruptible power supply system particularly provides a temporary power source to the i mportant devices for the ation control of nuclear critical monitoring in the plant. Thus, the system is potentially important and essential for wear plants. The pap er repots the curr...
英字タイトル:
Maintenance management of emergency power supply equipment(uninterruptible power supply) in Tokai reprocessing plant