After the permanent shutdown of K1 in 2017, decommissioning processes have attracted great attention. According to the current decommissioning roadmap, the dismantling of the activated components of K1 may start in 2026, following the removal of its spent fuel. Since the reactor vessel (RV) and reactor vessel internal (RVI) of K1 contain massive components and are relatively highly activated, their decommissioning process should be conducted carefully in terms of radiological and industrial safety. For achieving maximum efficiency of nuclear waste management processes for K1, we present activation analysis of the segmentation process and waste classification of the RV and RVI components of K1. For RVI, the active fuel regions and some parts of the upper and lower active regions are classified as intermediate-level waste (ILW), while other components are classified as low-level waste (LLW). Due to the RVI’s complex structure and high activation, we suggest various underwater segmentation techniques which are expected to reduce radiation exposure and generate approximately nine ILW and nineteen very low level waste (VLLW)/LLW packages. For RV, the active fuel region and other components are classified as LLW, VLLW, and clearance waste (CW). In this case, we suggest in-situ remote segmentation in air, which is expected to generate approximately forty-two VLLW/LLW packages.

1. Introduction
2. RVI segmentation
    2.1 RVI sub-component
    2.2 RVI segmentation process
3. RV segmentation
    3.1 RV structure
    3.2 RV segmentation process
4. Conclusion
REFERENCES

• Young Hwan Hwang(한수원㈜중앙연구원) | 황영환 Corresponding Author.
• Seokju Hwang(한수원㈜중앙연구원) | 황석주
• Sunghoon Hong(한수원㈜중앙연구원) | 홍성훈
• Kwang Soo Park(두산중공업㈜) | 박광수
• Nam-Kyun Kim(한전KPS㈜) | 김남균
• Deok Woon Jung(코네스코퍼레이션㈜) | 정덕원
• Cheon-Woo Kim(한수원㈜중앙연구원) | 김천우