2. adiation safety management practices in 19th preventative maintenance of Kori unit 4 and future plans

3. Table of Contents 1. Improvement practices of Radiation Safety Management - Introduction 1. Improvement practices of Radiation Safety Management - Introduction 2. Improvement practices of Radiation Safety Management - the point 2. Improvement practices of Radiation Safety Management - the point 3. Improvement practices of Radiation Safety Management - conclusion 3. Improvement practices of Radiation Safety Management - conclusion 4. Future plan - automatic decontamination device for contaminated protect wear 4. Future plan - automatic decontamination device for contaminated protect wear Korea Nuclear Eng,.

5. The role of Safety Manager And Dose reduction techniques The role of Safety Manager And Dose reduction techniques Improvement practices of Radiation Safety Management - Introduction Practices of process control by each water level control of S/G secondary side Practices of process control by each water level control of S/G secondary side Automatic decontamination device for contaminated protect wear Worker Management Protection Control Korea Nuclear Eng,.

6. RCS water level S/G secondary side water level Improvement practices of Radiation Safety Management – the point Reduction radiation dose exposure of workers by process control depend on each water level control of S/G secondary side Korea Nuclear Eng,.

7. Comparison of radiation dose at main point due to water level of S/G secondary side Improvement practices of Radiation Safety Management – the point Reduction radiation dose exposure of workers by process control depend on each water level control of S/G secondary side Korea Nuclear Eng,.

8. Perform to the work at inside of S/G secondary side Man-Way ○ impossible to emplace of shielding ○ hot and humid of workplace → not easy to wear shield garment Process control for moisture separator work and Lancing/FOSAR ○ keep the water level more than 70% – space radiation dose rate↓ ○ Lancing / FOSAR working with fully drained – space radiation dose rate ↑ ○ process control in order to not perform the working of moisture separator and Lancing / FOSAR at same time → keep the water level more than 70% at working of moisture separator Process control by each water level – S/G moisture separator work Process control by each water level – S/G moisture separator work Improvement practices of Radiation Safety Management – the point Reduction radiation dose exposure of workers by process control depend on each water level control of S/G secondary side Korea Nuclear Eng,.

9. Process control for each water level – 126ft Improvement practices of Radiation Safety Management – the point Reduction radiation dose exposure of workers by process control depend on each water level control of S/G secondary side Korea Nuclear Eng,.

10. complete The working complete The working Orderly progression other working Orderly progression other working Complete Lancing & FOSAR / conform fill water Complete Lancing & FOSAR / conform fill water complete The working complete The working complete Lancing & FOSAR / conform fill water complete Lancing & FOSAR / conform fill water Process by each water level – 126ft complete The working complete The working Orderly progression other working (ISI, RCP, snubber, valve) Orderly progression other working (ISI, RCP, snubber, valve) Complete Lancing & FOSAR / conform fill water Complete Lancing & FOSAR / conform fill water Lancing & FOSAR working With complete drainage Lancing & FOSAR working With complete drainage After drainage S/G Lancing & FOSAR After drainage S/G Lancing & FOSAR Orderly progression other working (ISI, RCP, snubber, valve) Orderly progression other working (ISI, RCP, snubber, valve) After drainage S/G Lancing & FOSAR After drainage S/G Lancing & FOSAR Orderly progression other working (ISI, RCP, snubber, valve ) Orderly progression other working (ISI, RCP, snubber, valve ) S/G ‘B’ S/G ‘C’ S/G ‘A’ Improvement practices of Radiation Safety Management – the point Reduction radiation dose exposure of workers by process control depend on each water level control of S/G secondary side Korea Nuclear Eng,.

11. 12% 600 target 985 763 993.24 642.76 result targetresult 단위 [man-mSv] Improvement practices of Radiation Safety Management – conclusion Reduction radiation dose exposure of workers by process control depend on each water level control of S/G secondary side Korea Nuclear Eng,.

13. summary issues Korea Nuclear Eng,.

14. ▪ fabrication of closed structure ▪ device for connected with hood ▪ stereoscopic rotation air injection by dual pressure Development of automatic system Korea Nuclear Eng,.

15. Expected effection Reduction of radioactive waste ★ reduction of liquid & solid radioactive waste - reduce processing cost - reduction of drums Reduction of the number of re-washing and drying Solution of increase in concentration of fine particulate dust problem Systematic management for contaminated protect wear Korea Nuclear Eng,.

16. Structure of C/V 126ft kori plant 2 Korea Nuclear Eng,.