is working with its US partner, GE Hitachi Nuclear Energy, on the development of the BWRX-300 small modular reactor with superior economics that takes advantage of features from the boiling water reactor (BWR). To achieve this, Hitachi-GE Nuclear Energy, Ltd. What is needed to make the safe and clean generation of nuclear power more competitive in the market is to achieve generation costs that are lower than other alternatives together with reducing capital cost and capital risk. Hitachi intends to continue to develop this technology in response to customer needs and to deploy it in Japan and overseas. The work was successfully completed, achieving the target level of decontamination. Before commencing, fluid dynamics simulation, mockup trials, and other measures were first used to verify that the technique would be able to decontaminate all of the complex reactor internals, in place and simultaneously, while also doing the work without being able to use the existing reactor recirculation pumps, technical challenges not previously faced in Japan. Hitachi has been awarded a contract for chemical decontamination of the inside of the reactor pressure vessel and the reactor internals at Hamaoka Nuclear Power Station Unit 1 of Chubu Electric Power Company, which is currently being decommissioned. The technique has already been used more than 90 times both in Japan and overseas to reduce worker exposure in operating plants by decontaminating equipment such as external reactor piping that connects to the reactor and is subject to high levels of radiation.

Hitachi developed a decontamination technique that uses hydrazine, oxalic acid, and potassium permanganate (HOP) in 1999. Because worker exposure to radioactive material that has built up on piping and other equipment is a concern during decommissioning, planning for the initial stages of this work includes decontamination to remove this material. An increasing number of nuclear power plants have reached the stage of decommissioning over recent years.

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