December 14, 2011 Tokyo Electric Power Company. Fukushima Daiichi Nuclear Power Plant Situation of Solid Waste Storage

Transcription

1 December 14, 2011 Tokyo Electric Power Company Fukushima Daiichi Nuclear Power Plant Situation of Solid Waste Storage 1

2 Summary of the survey 1.Purpose Confirmation of the situation of the radioactive solid waste keeping and the storage building. 2.Object of the survey Storage No. 5 No. 8 which keep solid wastes (drums). 3.Content of the survey Visual confirmation of the insides of each storage. Measurement of dosage rate around and insides of each storage. Measurement of radioactive materials density in air inside the storages. 2

3 Schematic layout of solid waste storage Solid waste storage No.3 Solid waste storage No.1, No.2 3

4 Result of the survey(storage No. 5~8:1 st floor) Situation of the keeping in each storage Close-up pf drum 1 st floor of No.7 lane No.3 Miscellaneous solid segregation/solidification Solidification building 1 st floor of No. 6 north side 1 st floor of No.6 north side No.7 No.6 No.4 No.3 No.5 Inspection Administration building 空コン倉庫 1 st floor of lane No.1 Loading and unloading 1st floor of No.6 north side periodic inspection B periodic inspection A 1 st floor of No.6 south side No. 5 south side (mountain side) No. 5 south side (sea side) 4

5 Result of the survey(no. 6 ~8:1 st and 2 nd basement) Situation of the keeping in each storage 1 st basement 2 nd basement No.7 No.6 No.7 No.6 1 st basement of lane No.6 2 nd basement of No.6 1 st basement of No.7 lane No.3 2 nd basement of No.7 lane No.2 1 st basement of No.6 2 nd basement of lane No.5 5

6 Result of the survey (No.5~8:1 st floor dose equivalent rate) Miscellaneous solid segregation/solidification Solidification building μsv/h No.6 No.7 30 No.4 No periodic inspection B No Loading and unloading periodic inspection A Inspection Administration building Empty concrete storage 6

7 Result of the survey(no.6~8:1 st and 2 nd basement dose equivalent rate) μsv/h 1 st basement 2 nd basement No.6 No.7 No.6 No

8 Result of the survey(summary) The dose rate inside the solid waste storage was about 0.3~30μSv/h. It was equal to or lower than the rate around the storage. Amount of keeping (equivalent to the number of drums) Number of turnover Radioactive materials cannot fly from the open drums since the contents of the drums are pieces of concrete contained in plastic bags and non-free-floating radioactive materials such as metallic pipes and steel stock etc. As a result of an analysis of radioactive materials in air, it was below measurable limit except a slight amount of Cs-137 was detected on the 1 st floor of the storage No. 6 ( Bq/cm 3 ). This Cs-137 appears to be due to extraneous effect. No.5 No.6 No.7 1 st floor 1 st floor 1 st basement 2 nd basement 1 st floor 1 st basement 1,000 12,000 15,000 14,000 23,000 20, The proportion of the drums lying on their side was low ( 0.7%). It was confirmed that there were 32 drums opened by turnover in total. No significant damage of the buildings was not confirmed as a result of the visual inspection. 2 nd basement 1 st floor 1 st basementy 2 nd basement 21,000 27,000 21,000 20, None 80 large-size 13 8

9 Future plans We will handle the following items as soon as possible: Restoration of the solid waste storage. Restoration of the open drums. Organizing the drums lying on their side. 9

10 Reference:Solid waste storage Status of No.1~4 Temporarily placed debris container Miscellaneous segregation/solidification Solidification building No.7 No.6 No.4 No.3 periodic inspection B No.5 Loading and unloading periodic inspection A Administration building Inspection Empty concrete storage No.2 No.1 Temporarily placed drums which had been used at the centralized radiation waste treatment facility etc. Temporarily placed protective clothing (used). A part of large-size waste in storage. 10