August 30, 2010 Improvements of ADR System Improvements of ADR System Ulchin NPP units 5&6.

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August 30, 2010 Improvements of ADR System Improvements of ADR System Ulchin NPP units 5&6

. Brief Overview of ADR System. Lessons learned from the use of ADR Sys.. Existing problems. Contents of improvement. Effects Contents 2/25

1. Main function of ADR(Automatic Dose Reader) Sys. Access Management Of Radiological Controlled area Workers information Management of RWP Entrance date ADR, TLD No. etc ERWP (Extended Radiation Work Permit) RRWP (Regular Radiation Work Permit) SRWP (Specific Radiation Work Permit) Radiation dose management Personnel dose management Collective dose management Regular dose management. Brief Overview of ADR System 3/25

2. Entrance procedure ERWP RRWP SRWP Identification Setting alarm for alarm limit Reader(Entrance) - ADR/TLD scan - Select RWP - Notice Open Turnstile Radiation Protection Training Whole Body Counting Medical Exam Issue TLD Register radiation worker Register radiation worker Issue RWP Take ADR Enter RCA. Brief Overview of ADR System(Cont.) ADR dose information Contamination Entrance and exit details Gate Open After work After work ADR Reader(Exit) Portal Monitor Exit To enter To exit 4/25

5 PictureCharacteristic Direct reading(real time reading) Displaying dose, dose rate Generating audible & visual alarms 3. ADR(Automatic Dose Reader) Function. Brief Overview of ADR System(Cont.) 5/25

. Existing problems 1. Inconvenience and confusions due to multi-access steps for entrance 1. Inconvenience and confusions due to multi-access steps for entrance Insert ADR & scan TLD Push ENTER button twice(1 RWP ) Input RWP No. (If more than 2 RWPs exist ) Push ENTER button twice Enter 6/25

. Existing problems(Cont.) 2. Users inconvenience due to inputting RWP No. Ex) RWP No. : E Occurrence of system errors with turnstile (In 2006) Turnstile error : 72 times (reading error of photo sensor) Communication error: 56 times (Between Reader and PC) 7/25

4. RWP No. input errors (if more than 2 RWPs exist) Inaccurate dose statistics with allocated tasks due to input errors on RWP No. During O/H in 2006 : 540 times (#5: 293, #6: 247) Operation period in 2006 : 56 times (#5: 37, #6: 19) Man power lost to correct RWP No. errors 8/25. Existing problems(Cont.)

5. Increasing purchase costs Difficulties in operation & maintenance 5. Increasing purchase costs Difficulties in operation & maintenance Manufacturer : foreign supplier Not easy for maintenance Purchase costs Increase due to a monopolistic * supplier * a monopolistic : in business it tries to control as much of an industry as it can and does not allow fair competition.( ) 9/25. Existing problems(Cont.)

6. LCD (4 Lines, 20 Characters per line) was too small to display all the information that workers need to know 6. LCD (4 Lines, 20 Characters per line) was too small to display all the information that workers need to know Check RWP No. in Radiation information system Check RWP No. to H.P Check Personnel Information in DREAMS Check ADR Sys. in H.P Room ADR Reader Inform -ation on Worker If more Than 2RWPs 10/25. Existing problems(Cont.)

11 11/25 Existing LCD picture(old model). Existing problems(Cont.)

7. ADR System errors(turnstile & data transmission) Turnstile sensors sometimes were not recognized exactly. Using the hardwire cable between PC and Reader caused many data transmission errors. 12/25. Existing problems(Cont.)

. Lessons learned from the use of ADR Sys. 1. To reduce ADR system failures and errors 2. To be convenient for users to access 3. Easy maintenance and cutting costs New ADR System has been adopted from March, /25

1. Simplifying steps for easy access. Contents of improvements BeforeAfter Scan ADR & TLD Push ENTER button twice Confirm RWP No. and input RWP No. (if more than 2 RWPs exist) Enter radiological controlled area Same as Before None Select the RWP shown on the touch screen Enter radiological controlled area 14/25

. Contents of improvement(Cont.) BeforeAfter None. but workers RWP No. Developed program to display most of information on the wide LCD screen - Workers radiation dose history - Protective equipments requirement - RWP, WBC, etc. 2. Redesign of displaying system for additional information about radiation worker 2. Redesign of displaying system for additional information about radiation worker 15/25

16 Redesign small LCD to the wide touch screen Before After 16/25. Contents of improvement(Cont.)

17 RWPs & Individual information on worker 17/25. Contents of improvement(Cont.)

Specific requirements and notices for radiation safety 18/25. Contents of improvement(Cont.)

BeforeAfter 4 sensors inside turnstile Use of a hardwire cable between PC and Reader Added 2 photo sensors for exact acknowledge Changed to LAN 3. Making system error and failure to zero. Contents of improvement(Cont.) 19/25

No access errors after adding photo sensors Before After Sensor 20/25. Contents of improvement(Cont.)

BeforeAfter Difficulties in repair and normalization of ADR system because of foreign supplier Caused the price of ADR system and spare parts to keep being high Localization of ADR system resulted in prompt maintenance supports from domestic supplier and decreased purchase price including cost for maintenance 4. Convenience of maintenance & Cost reduction. Contents of improvement(Cont.) 21/25

Item Before (2006) After (2007~2010) System communication error120 Turnstile sensor error180 Input error of RWP No.560. Effects 1. Enhancement of system reliability 22/25

2. Cost reduction Item Purchase Cost Cost Reduction BeforeAfter Cost of purchase - ADR system S/W(1set) - ADR reader(20ea) Cost of Maintenance 50, , ,000 7, ,000 50,000 42, ,000 50,000 Total510,000317,200192,800 Ulchin units 5, 6 (for ten years) (Unit : US$) Cost Reduction /year : 192,800,000Won / 10years. Effects(Cont.) 23/25 19,280 US$ / year

3. Additional effects Users satisfaction due to simplified access step through ADR sys. Enhanced efficiency of radiation safety management by providing prompt information for radiation safety No extra man power to correct the input errors, i.e. RWP No. Localization of ADR system ensured secure supply. Effects(Cont.) 24/25

25/25