Example of method 2 "Retrieving fuel debris from the top (mobile platform)”

Index > Challenges and Plant information : Overview of methods｜Example of method 2 "Retrieving fuel debris from the top (mobile platform)” > (6) Dismantle and remove internal structures

ⅰ) Challenges and reference information : (6) Dismantle and remove internal structures

Task(s): Method for dismantling of internal equipment, transport and storage after dismantling.

(6) Dismantle and remove internal structures - Major challenges on the actual method

(1)Prior preparation

(2)Install barrier

(3)Remove shield plug

(4)Remove PCV/RPV upper head

(5)Install equipment and access

(6)Dismantle and remove internal structures

(7)Retrieve fuel debris

(8)Collect fuel debris and Transfer canister

(9)Clean-up equipment

Removal

Method for cut / demolition / removal of internal structures
Equipment to be used for the method
(Out of scope of the cutting and dust collection technology written in the RFP)
Cooling method when current water cooling system becomes unavailable

Plant information	Schematic diagram for internal structures Dimension and weight of internal structures Atmospheric environment inside PCV (temp, dose rate, pressure, etc.)

Temporary storage

Preparation of temporary storage
Method for transportation of the internal structures to the temporary storage

Plant information	Work space on the operation floor (Plain view)

Assumptions and prerequisites	Allowable load of operation floor and passageway : 1.2t/㎡ Size of equipment which should be transported through passageway : Width 1.2m, Height 3m or less Overhead crane specification (Rated load 100t) Air dose rate inside the PCV/RPV - Dose rate inside the PCV 100Gy/h - Dose rate inside the RPV 1kGy/h

→(7) Retrieve fuel debris