Unit 3 Decommissioning



Unit 3 Spent Fuel Removal: Second half of FY2017

Unit 3 Reactor Fuel Removal: First half of FY2020





Unit 3 July 2014 (METI)

Containment Structure
1.  approx.34m
2.  approx.11m
3.  approx.20m
4.  approx.9m
5.  approx.2m
6.  approx.17-34mm
Carbon steel liner




Reactor Vessel
1.  approx.21m
2.  approx.5.5m
3.  approx.14cm
4,  approx.18.4m
Carbon steel (with stainless steel lining)
Weight of UO2: 107t








Temperature at the bottom of RPV: latest data
Temperature in PCV: latest data
Temperature in reactor building As of 11/14, 2013: 14.1℃ (reference) Outdoor air temperature 12.0℃
Temperature of accumulated water in torus room: Unidentified
Humidity in PCV: Unidentified
Humidity in RPV: Unidentified
Flow rate of nitrogen injection:  latest here
Hydrogen concentration in PCV: latest here
Pressure in PCV:  latest here
Dose rate in PCV: Unidentified
Dose rate in RPV: Unidentified
Dose rate in the building: Most recent survey 2013
Dose rate in torus room: 100-360mSv/h (As of 7.11,2012)
Radioactive concentration: latest here
Water level of accumulated water in PCV: Estimated to be approx. 6.5m from bottom part (As of 5,2014)
Water level of accumulated water in torus room: OP3370mm (As of 6.6,2012)
Water level of accumulated water in triangle corner: OP3150 (As of 6.6,2012)
Mass of fuel debris: Unidentified
Distribution of fuel debris (assumption): Existing the core part, lower plenum and PCV, but the ratio among those locations is unknown
Fuel debris MCCI products: Unidentified
Fuel debris dose rate: Unidentified
Fuel debris hardness: Unidentified
Fuel debris density: Unidentified (experiments to estimate fuel debris density here)
Weight ratio of fuel debris remaining in RPV: TEPCO 37% JAEA 36%
Percentage of fuel debris not in the RPV: TEPCO 63% JAEA 64%
Diagram of reactor vessel internal structures along with weights and dimensions located here: reactor_internals_id09_e.



IRID cites the current nitrogen injection system as the starting point for plans to be developed to manage hydrogen gasses during decommissioning and fuel debris retrieval.




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