&2 UNIT KORI NPP

2 General Introduction Ⅰ Ⅲ GOOD PRACTICE FIELD APPLICATION CONCLUSION Ⅴ Ⅱ GOOD PRACTICES EFFECT ANALYSIS ⅳ

3 Kori 1 Location : East in Korea Type : PWR Commercial Operation : NSSS/TBN : Westinghouse/GEC-Al stom Output : 587 MWt/650 Mwe, 2 Loop Under getting renewal approval & permission to keep up operation Kori NPP

4 LOND O N Sizewell “B” Sizewell B Plant Location : Sizewell in Suffolk Type : PWR of British Energy Commerical Operate : NSSS/TBN : Westtinghouse/GEC-Alstom Output : 3,411 MWt/1,200 Mwe, 4 Loop

5 ITEM S/W “B” KORI ULCHIN 19571, OUTAGE (Unit : man-mSv)` COLLECTIVE RADIATION DOSE BY EUROPEAN

6 S/G CHANNEL HEAD (MAX) (Unit : mR/h) ITEM1st2nd3rd4th5th6th7th8th SW “B” KORI 1--12,00020,00018,00014,00025,00020,000 ULCHIN18,3009,40013,7009,1609,7008,7008,20013,500 COLLECTIVE RADIATION DOSE

7 An systematic chemical treatment improved from HFT for operating the power plant.(Li-B pH Control mode) An systematic chemical treatment improved from HFT for operating the power plant.(Li-B pH Control mode) C hemical treatment improved Operate the 4RCPs at the stage of Acidic Oxidation after inserting hydrogen peroxide to remove crude Uses Inconel-690 of low cobalt for S/G Tube. Perform large-scale cleaning removing the residual cobalt Uses Inconel-690 of low cobalt for S/G Tube. Perform large-scale cleaning removing the residual cobalt Changed design & Cleaning

8 Radiation Protective Equipment Out sweat in the working clothes Not infiltrates pollution from outside Fine in weave & pollution is well removed See its ADR through clear plastic bag after wearing it. Out sweat in the working clothes Not infiltrates pollution from outside Fine in weave & pollution is well removed See its ADR through clear plastic bag after wearing it. Radiation Protective Equipment

9 Cavity Cleaning

10 Many Sized Shielders Shielding Movable / Permanent Shielding Easy Shielding Flexibility

11 Existing Clothes ADAPTING CONTENTS ADAPTING CONTENTS Vinyle ClothesHoodRubber Gloves Blue SuitLS ClothesClean CapThin Rubber Gloves

12 Assigned : 11areas Location : Rx+20.0m(2area), Rx+11.5m(2area), Rx+8.0m(3area), Rx+ 5.0m(1area), Rx± 0.0m(2area), Rx-3.4m(1area) Assigned : 11areas Location : Rx+20.0m(2area), Rx+11.5m(2area), Rx+8.0m(3area), Rx+ 5.0m(1area), Rx± 0.0m(2area), Rx-3.4m(1area) Object Major staff - white helmet with yellow rim Operator - white helmet with red rim HP - yellow jacket Object Major staff - white helmet with yellow rim Operator - white helmet with red rim HP - yellow jacket Assign Laydown area Assign Laydown area Safety helmet color differentiation Safety helmet color differentiation

13 Buffing, Grinding, Assembly/Disassembly of lagging (ISI) Wearing glasses inside goggle – Wilder, Enlargement Wearing glasses inside goggle – Wilder, Enlargement Assembly of lagging meterialsBuffing

14 Stretcher : In the C/V Medical treatment supplies : At the entrance of the C/V Stretcher : In the C/V Medical treatment supplies : At the entrance of the C/V Set up Medical treatment supplies in the C/V Set up Medical treatment supplies in the C/V StretcherMedical treatment supplies

15 FME (Foreign Material Exclusive) FME (Foreign Material Exclusive) View Zone hand rail Reactor Cavity Stud Bolt S/G 2 nd hand rail Reactor Cavity S/G 2nd Man-Way hand rail View Zone hand rail (S/G A Upper) Stud Bolt Reactor Cavity S/G 2nd Man-Way hand rail View Zone hand rail (S/G A Upper) Stud Bolt

16 Washing/Drying TIME

17 Disposal Water Amount 200L/Drum Blue Suit, 192 LS Clothes - 80 Existing Clothes, 200 Vinyl Clothes Drum Packages

18 ItemOperation PeriodOutage Instrument electric power consumption electric power consumption Blue Suit LS Clothes Existing Clothes Existing Clothes Blue Suit LS Clothes Existing Clothes 1time/1day (Washer 2set, Dryer 1set) 1time/1day (Washer 2set, Dryer 1set) 1time/1day (Washer 2set, Dryer 2set ) 1time/1day (Washer 2set, Dryer 2set ) 2time/1day (Washer 3set, Dryer 2set ) 2time/1day (Washer 3set, Dryer 2set ) 100KW/1day 473KW/1day 2time/1day (Washer 3set, Dryer 3set ) 2time/1day (Washer 3set, Dryer 3set ) 3time/1day (Washer 3set, Dryer 3set ) 3time/1day (Washer 3set, Dryer 3set ) 7time/1day (Washer 3set, Dryer 3set ) 7time/1day (Washer 3set, Dryer 3set ) 363KW/1day 1,656KW/1day Electric power consumption

19 No Contamination(Blue suit) Material Characteristics of LS clothing (Nylon99%+Carbon Fiber 1%) No Contamination(Blue suit) Material Characteristics of LS clothing (Nylon99%+Carbon Fiber 1%) Pollution removal rate R emoval rate 38 (Less 400Bq/100 ㎠ ) ’nd ’st Pollution removal rate(%) 394 ～ 3, ～ 3,939 Range of Contamination(Bq/100 ㎠ ) 13 Object(suit) Existing ClothesLS ClothesItem

20 Blue Suit / LS Suit / Clean Cap / Thin rubber gloves flexibility Distinguish safety helmets by colors – (ULJIN 1) – (KORI 1) – (KORI 1) Location : C/V L-5 & L-4 (27~28 ℃, 80%) Location : C/V L-5 & L-4 (27~28 ℃, 80%) Research period Subjects

21 KHNP, KPS, Samchang, KPS’s contractors KHNP, KPS, Samchang, KPS’s contractors PARTICIPANTS RESULT 95% satisfied(ULCHIN) Improvement Subjects Blue Suit - Separating winter and summer season - Elastic cord and string simultaneously - Thinner cotton - Size and tag mark LS Suit - Resistant to tearing - Sticks to body owing to sweat - Body types - Anti-crumple

22 Apply the applicable items in the field In nuclear power plants in Europe, through the improvement in radiation control parts. Make effort to reduce radiation exposure

23