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CCTV System for Radiation Work Management. Yonggwang NPP Unit 5 & 6. Contents. Ⅰ. YGN Unit 5 & 6 Ⅱ . Brief Overview of Radiation Protection Ⅲ . Description of CCTV system Ⅳ. Cases for use of CCTV system Ⅴ. Effects Ⅵ. IAEA OSART Good Practice Ⅶ. Conclusion. Ⅰ . YGN Unit 5 & 6.

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CCTV System for Radiation Work Management


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    1. CCTV Systemfor Radiation Work Management Yonggwang NPP Unit 5 & 6

    2. Contents Ⅰ. YGN Unit 5 & 6 Ⅱ. Brief Overview of Radiation Protection Ⅲ. Description of CCTV system Ⅳ. Cases for use of CCTV system Ⅴ. Effects Ⅵ. IAEA OSART Good Practice Ⅶ. Conclusion

    3. Ⅰ. YGN Unit 5 & 6 □ Key Features • Type : PWR • Power Level : 1,050MWe • 2 Loops, 2 S/Gs, 4 RCPs • 177 Fuel Assy’s, 16 × 16 tubes • S/G : Vertical U-tube with Economizer • Condenser Heat Sink : Sea water

    4. Ⅱ.  Brief Overview of Radiation protection □ Statutory Exposure Dose limit □ Site Exposure Dose limit

    5. Ⅱ.  Brief Overview of Radiation protection [cont’d] □ Radiation Work Control

    6. Ⅱ.  Brief Overview of Radiation protection [cont’d] □ Collective Radiation Exposure Year

    7. Ⅲ. Description of CCTV system □ Purpose • Radiation Exposure Reduction • Efficient Radiation Safety Control in RCA • Continuous Check-up for important works and facilities integrity • □ Characteristics • Real-time information by LAN • Movable Cameras can support important or high radiation work anywhere

    8. Ⅲ. Description of CCTV system [cont’d] □ Composition

    9. Ⅲ. Description of CCTV system [cont’d] □ Network LAN LAN Movable or Fixed HP Room Console Lack Office Lobby Monitor

    10. Ⅲ. Description of CCTV system [cont’d] □ Location (Fixed Camera)

    11. Ⅲ. Description of CCTV system [cont’d] □ Location (Movable Camera) • Movable Cameras are communicated with main control center by using connecting jack

    12. Ⅲ. Description of CCTV system [cont’d] □ View of Fixed Camera

    13. Ⅲ. Description of CCTV system [cont’d] □ View of Movable Camera

    14. Ⅲ. Description of CCTV system [cont’d] □ CCTV system Diagram HP ROOM MONITOR MONITOR ACB 100’ LOCKER AREA ROOM MONITORING SERVER(DVR) MATRIX SWITCHER ACB 100’ Entrance of RCA 11SET SAB 100’ GEN ACCESS AREA SAB 77’ GEN ACCESS AREA KEYBOARD KEYBOARD FHB 100’ TRUCK BAY AREA 4SET PAB 144’ LINK FACILITY FHB 142’ STORAGE AREA PAB 144’ PERSONAL AIRLOCK AREA LINK FACILITY to RWB

    15. Ⅲ. Description of CCTV system [cont’d] □ HP Room Console Rack (Main control center) • Real time Monitoring all places where cameras are located. • Recording important works • Announcing • Auto Recording when any movement is detected.

    16. Ⅲ. Description of CCTV system [cont’d] □ Monitoring in HP Room Console Rack All locations under surveillance The main work place

    17. Ⅲ. Description of CCTV system [cont’d] □ Comparison (use or not)

    18. Ⅳ. Cases for use of CCTV system Case 1 □ Removal of remaining Thermal Sleeve (T/S) • 2005.05 Unit 5 third Planned Outage (37 days) <Related event description> • During the first outage of unit 5, a metal object was discovered in the Reactor Bottom Head. (conformed by Remote Video Inspection) • As a result of the specific inspection, three metal objects were discovered. These objects have been identified as missing thermal sleeves from the Safety Injection Nozzle. • A remaining T/S was planned to be removed during the third Outage

    19. Ⅳ. Cases for use of CCTV system Material : Inconel 690 Size (mm) : 304(W)×554(H)×4.5(T) Weight (kg) : 20Kg Dose rate (removal): 6mSv/hr

    20. Ⅳ. Cases for use of CCTV system [cont’d] □ Monitoring T/S Work through CCTV System

    21. Ⅳ. Cases for use of CCTV system [cont’d] □ Result of ALARA Control • Reason of exposure Reduction

    22. Ⅳ. Cases for use of CCTV system [cont’d] □ Effect of using CCTV System • Reduction of Exposure : 16 man-mSv (10%) • About 15 persons supervised the work through CCTV during the working period (11days) = persons x staying time x Radiation level in the area • Optimization of Working Time : 9.6 man-mSv (6%) • Reduction of Radioactive Waste : 1 Drum • About 220 pairs of Rubber gloves / paper protection Clothes

    23. Ⅳ. Cases for use of CCTV system [cont’d] Case 2 □ Maintenance of leak Valve (SI-V522) in SI System • Date : ’07. 7.17(unit 6 fourth outage) • Work Description • At the time of NOT/NOP, SI- check Valve 522 of High Presser • Safety injection Header leaked • Piping was isolated throughout Ice plugging and Valve was • Maintained • CCTV System was used to monitor the maintenance work • and ALARA Control

    24. Ⅳ. Cases for use of CCTV system [cont’d] □ Result of ALARA Control • Number of workers: 16 • Total working time : 6 hrs

    25. Ⅴ. Effects • Reduction of the number of person coming in and out • Reduction of exposure dosage • Reduction of radioactive waste • Savings in protection supplies • Real-time checkup in the office • Radiation safety control in high radiation areas

    26. Ⅵ. OSART GOOD PRACTICE □ IAEA OSART Review  Duration : 2007. 4.16 ~ 5.3 Reviewed items -7 items besides management, organization, & administration sections of YGN 5&6  Result of review in Radiation Protection Section - 2 good practices out of 10 good practices (No proposal for improvement) • CCTV System was evaluated as “Good Practice”  the other is RIS (Radiation Information System)

    27. Ⅵ. Conclusion • Radiation safety control is requisites for lasting nuclear industry • Our various efforts will help to improve radiation safety control whether it is large or not • Actually, CCTV system is small effort but the such effort will makes a good fruit Our will and endeavor should be followed

    28. Thank You!!!

    29. Maintenance of Leak Valve (SI-V522)

    30. Maintenance of leak Valve (SI-V522)

    31. □ KHNP(Korea Hydro & Nuclear Power)Organization KHNP Overview President & CEO Headquarters QA Office Auditor Audit Office PI Office Power Gen. Div. Project Div. Plan & Admin Div. Radwaste Project Div. Branches Nuclear Power Site Hydro Power Yonggwang Kori Wolsong Ulchin Han-gang Hydro Power Gen. Admin. Office Nuclear Power Environ. Tech. Inst. Radwaste Project Site Office New York Office Comm. & Envir. Off. Plant 1 (Unit1&2) Paris Office Nuclear Power Education Inst. Radiation Health Research Inst. Plant 2 (Unit3&4) Plant 3 (Unit5&6)

    32. KHNP Overview [cont’d] □ Status of Nuclear Power Plants Site InOperation Under Const/Planed Total Unit (MW) Kori 4 (3,137) 8 (7,937) 2 (2,000), 2 (2,800)/ - Wolsong 4 (2,779) 2 (2,000)/ - 6 (4,779) - 6 (5,900) Yonggwang 6 (5,900) Ulchin 6 (5,900) - / 2(2,800) 8 (8,700) Total 20 (17,716) 8 (9,600) 24 (21,716) ◎Seoul Ulchin #1,2,3,4,5,6 (Shin-Ulchin #1,2) Wolsong #1,2,3,4 (Shin-Wolsong #1,2) Yonggwang #1,2,3,4,5,6 Kori #1,2,3,4 (Shin-Kori #1,2,3,4)

    33. KHNP Overview[cont’d] □ Nuclear Power Plants in Operation 20 units (17,716 MW)

    34. KHNP Overview[cont’d] □ NPP planned or under Construction 8 units (9,600 MW) * OPR : Optimized power Reactor * APR : Advanced power Reactor