Example of method 2 "Retrieving fuel debris from the top (mobile platform)”
Index > Considerations - 1. Dose reduction｜Example of method 2 "Retrieving fuel debris from the top (mobile platform)”
ⅱ) Considerations - 1. Dose reduction
Issues to be noted for the proposing method in terms of safety are explained below.
- Clarification of objects for mote and close oprations
- Method to minimize the workers' exposure
Issues requiring special attention 1. Dose reduction
(1) Prior preparation
- Dose reduction for workers when transporting/installing equipment and removing it
- Dose reduction for workers when investigating
(2) Install barrier
- Dose reduction for workers when installing barrier
(3) Remove shield plug
- Dose reduction for workers when removing shield plug
- Dose rate reduction for external environment when removing shield plug
(4) Remove PCV/RPV upper head
- Dose reduction for workers when removing PCV lid/RPV head
- Dose reduction for external environment when removing upper head
(5) Install equipment and access
(6) Dismantle and remove internal structures
- Dose reduction for workers and external environment when dismantling and removing internal structures
(7) Retrieve fuel debris
- Exposure of workers when cutting fuel debris
- Dose reduction for external environment when cutting and storing fuel debris
(8) Collect fuel debris and transfer canisters
- Dose reduction for workers when storing fuel debris
- Dose reduction for external environment when storing fuel debris and transferring canisters
- Dose reduction for external environment affected by the radiation from temporary storage area
(9) Clean-up equipment
- Dose reduction for external environment when removing equipment
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