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

Index > Considerations - 3. Seismic safety｜Example of method 2 "Retrieving fuel debris from the top (mobile platform)”

ⅱ) Considerations - 3. Seismic safety

Issues to be noted for the proposing method in terms of safety are explained below.

  • Consideration shall be made for seismic safety and spesific study shall be performed in C/S

Issues requiring special attention 3. Seismic safety

(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

(1) Prior preparation

  • Seismic assessment when creating opening on the building for investigation and fuel debris retrieval

(2) Install barrier

  • Seismic assessment of barrier equipment
  • Seismic assessment of building when installing barrier on the operation floor

(3) Remove shield plug

(4) Remove PCV/RPV upper head

(5) Install equipment and access

  • Seismic assessment of equipment for fuel debris retrieval
  • Seismic assessment for the building when installing equipment on the operation floor (including shielding equipment)

(6) Dismantle and remove internal structures

  • Seismic assessment of equipment for retrieving fuel debris
  • Structural stability of internal structures during dismantling of internal structures

(7) Retrieve fuel debris

(8) Collect fuel debris and Transfer canisters

(9) Clean-up equipment

Plant information
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
  • Total weight of equipment installed on the operation floor shall be minimized based on seismic safety.
→ⅰ) Challenges and Plant information : Overview of methods｜Example of method 3 "Retrieving fuel debris from the side”