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Demonstration test on concrete with epoxy resin coating using ultra-high pressure water jet decontamination technology

超高圧水除染技術によるエポキシ樹脂コーティングされたコンクリートの除染実証試験

田川 明広; 手塚 将志; 寺倉 嘉宏*; 内藤 雅之*; 宮島 謙治*

Tagawa, Akihiro; Tezuka, Masashi; Terakura, Yoshihiro*; Naito, Masayuki*; Miyajima, Kenji*

東京電力福島第一原子力発電所の廃止措置を進めるために、建屋内を除染することは重要である。原子力発電所内は、除染を容易に行うためにエポキシ樹脂塗装されているが、汚染レベルが高いためにエポキシ樹脂ごとはぎ取る必要が考えられる。そこで、環境中で除染係数10から100を達成した最大280MPaの超高圧水除染技術を用いてエポキシ樹脂をはぎ取ることができるのか、はぎ取った後に回収された水を凝集沈殿によって処理することができるのかを確認する実証試験を「ふげん」で実施し、東京電力福島第一原子力発電所の廃止措置に利用できる目途を得た。

It is one of the most urgent issues to remediate the nuclear power plants contaminated by radioactive materials discharged following the accident at the TEPCO's Fukushima Daiichi NPS. Concrete walls of nuclear power plants in Japan are coated an epoxy resin coating for easily performing decontamination. We experimented a cutting test in Fugen Decommissioning Engineering Center using maximum 280 MPa pressure and 30 L/min water quantity, ultra-high pressure water jet system and 40 m$$^{3}$$/min air quantity vacuum system. We are conducting a study of decontamination technology in environmental pollution using this decontamination system. This decontamination system has achieved a decontamination factor 10 to 100. Thus, we have confirmed the change in a cutting ability by changing parameters. Parameters are the water pressure, the water quantity and air quantity. The impact force for water jet is a function that contains the test parameters. We have considered it using this function. The results of the test showed that there is a correlation between the impact force for water jet and a cutting capability. This decontamination technology can decontaminate radioactive material of the surface adhesion contamination and reduce the amount of waste generated for a thin cutting. In addition, we have experimented that the water can be recycled by chemical precipitation. After we experimented flocculation test using aluminum sulfate and zeolite flocculant, we have confirmed that it can clean water up to the level of suspended solids 5 mg/L, in turbid water using zeolite flocculant. This suspended solids concentration can be passed to the water processing system in nuclear power plant. From the test results, we found that ultra-high pressure water jet decontamination technology has a possibility that it can be used for decontamination of Fukushima Daiichi Nuclear Power Plant.

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