Assessment of contamination distribution of "Monju", 1; Overview of assessment and activation of fuel handling system

Hanaki, Shotaro  ; Kinoshita, Takuma*; Kishimoto, Yasufumi*; Hayashi, Hirokazu 

The decommissioning of the "Monju" facility, a 30-year process, is divided into 4 phases. In Phase 1, spent fuel is transferred to a storage pool, while Phase 2 involves dismantling uncontaminated areas. Phase 3 focuses on dismantling sodium equipment. Ongoing evaluations in Phase 1 and 2 aim to identify radioactive materials in the facility, reduce worker and public exposure, and establish demolition methods. The assessment is categorized into activation contamination from structural material activation and secondary contamination from corrosion products produced by leaching. This summary provides an overview of the contamination distribution assessment and the activation contamination assessment for fuel handling equipment specific to sodium-cooled fast reactors (SFRs).