Example of method 3 "Retrieving fuel debris from the side”

Index > Considerations - 2. Boundary｜Example of method 3 "Retrieving fuel debris from the side”

ⅱ) Considerations - 2. Boundary

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

  • Method for maintaining boundary is important in terms of prevention of release of radioactive material during the operation period

Issues requiring special attention 2. Boundary

(1)Prior (2)Install barrier (3)Create opening on the side of PCV (4) Install equipment and access (5)Dismantle and remove internal structures (6)Retrieve fuel debris (7)Transport canister (8)Clean-up equipment

(1) Prior preparation

  • Method of maintaining boundary to prevent spread of contamination caused by dispersion and backflow of radioactive material when checking condition insider the PCVRPV

(2) Install barrier

(3) Create opening on the side of PCV

(4) Install equipment and access

(5) Dismantle and remove internal structures

(6) Retrieve fuel debris

(7) Transport canister

  • Maintain boundary to prevent spread of contamination caused by dispersion and backflow of radioactive material during the period between the installation of an opening on the wall and the end of retrieving fuel debris

(8) Clean-up equipment

Plant information
Assumptions and prerequisites
  • Air dose rate inside the PCV/RPV
    - Dose rate inside the PCV 100Gy/h
    - Dose rate inside the RPV 1kGy/h
  • Effective dose rate outside the PCV
    - Operation floor : 1mSv/h
    - Operation areas except for operation floor : 3mSv/h
    - Passageway inside the building : 5mSv/h
  • Allowable load of 1st. floor : 1.2t/㎡
  • Size of equipment which should be transported through passageway : Width 1.2m, Height 3m or less
→ⅱ) Considerations - 3. Seismic safety