Investor Presentaiton

N NRA, Japan Nuclear Regulation Authority Contaminated Water Remaining in Trenches ■ Highly contaminated water remains in the main trenches in seaside area. Contaminated water is flowing in from T/Bs. ■ TEPCO attempts to drain the water after plugging the flow paths by using the similar technique to that to be used for frozen ice wall. Shaft B Tunnel A Planned freezing point Ice plugging 3 2 O.P.+10m Trench B Shaft C Trench C Tunnel B Tunnel B Unit 2 seawater pipe trench Shaft A Freezing operation since April 27 Shaft D Mobile treatment equipment Tunnel A Unit 3 seawater pipe trench Trench A Trench D Turbine Building Shaft Cable tray Grouting OP+7.4m Water level O.P. +3m Shaft T/B Unit-2 Freezing operation since June 13 Drilling in progress T/B Unit-3 Main trenches and ice plugging operation Source TEPCO, edited by the author: http://www.tepco.co.jp/en/nu/fukushima-np/roadmap/images/d140627_01-e.pdf duct 3 Tunnel 2 Schematic of main trench at Unit 2 Source TEPCO, edited by the author: http://www.tepco.co.jp/nu/fukushima-np/roadmap/images/t130627_11-j.pdf 24

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