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Construction of two 1,000m deep shafts and several drifts has been started for Mizunami Underground Research Laboratory Project, which is expected to contribute to the establishment of scientific basis for geological disposal of high-level radioactive waste. In order to enhance the technology and safety in this construction work, total evaluation method, which Land, Infrastructure and Transport Ministry of Japan has been applied to several public works, was applied to the open bidding of this project. The whole construction work was divided into two areas, and in the bidding, bidders were required to present technical proposals, which were reflected to contract documents for another construction area. This paper describes details of bidding system applied to the construction work of Mizunami Underground Research Laboratory.

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