[1D09-13] 1F 1

3:00 PM - 3:15 PM JST(6:00 AM - 6:15 AM UTC)

[1D10] Development of Investigation Technologies of Inside of RPV(Development of Access-from-Top/Side Investigation Method and Access-from-Bottom Investigation Method)(2)Development of Access-from-Bottom Investigation Method

*Haruto Chikura¹, Masanori Hatori¹, Akira Fugane¹, Yohei Taniguchi¹, Tomoya Shiga¹, Masayuki Sato², Hiroshi Konishi², Hirotaka Doi² (1. Tousou Mirai Technology, 2. IHI)

Keywords:

Fukushima Daiichi NPS,Fuel debris,Investigation inside RPV,Remote handling system

Prior to fuel debris retrieval at the Fukushima Daiichi Nuclear Power Station, it is necessary to determine the condition of in-vessel structures and the distribution of fuel debris. In this project, access-from-bottom investigation method was developed, in which the investigation device is inserted from the X-6 penetration through the pedestal to the reactor pressure vessel (RPV) bottom, enabling in-vessel investigation. To verify technical feasibility of this method, test investigation equipment was fabricated, together with full-scale mock-ups of in-vessel structures along the access route and of the investigation targets. Verification tests of the access and inspection technologies demonstrated that video images and point-cloud data of the targets can be obtained.