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Takeshi Masaki Nuclear Power Dept. Hokuriku Electric Power Company

Management of Occupational Exposure Dose using Entrance/Exit Processing System in Shika Nuclear Power Station. Takeshi Masaki Nuclear Power Dept. Hokuriku Electric Power Company. Location of Shika Nuclear Power Station. Gyeongju. Tokyo. Specification Of Unit 1& Unit 2.

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Takeshi Masaki Nuclear Power Dept. Hokuriku Electric Power Company

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  1. Management ofOccupational Exposure Doseusing Entrance/Exit Processing System in Shika Nuclear Power Station Takeshi Masaki Nuclear Power Dept. Hokuriku Electric Power Company

  2. Location of Shika Nuclear Power Station Gyeongju Tokyo

  3. Specification Of Unit 1& Unit 2 ※electric power is 1206MWe under operations using current plates

  4. Contents • Dose management at the Shika Nuclear Power Station • Measurement of exposure dose • Individual dose management • Work dose management • Features of the entrance/exit processing system at the Shika Nuclear Power Station

  5. Measurement of exposure dose in Shika Whole Body Counter (WBC) Measurement frequency -Male: Every three months -Female: Every month Glass Badge (GB) Measurement frequency Every month Alarm Pocket Dosimeter (APD) Measurement frequency Everyday Evaluation Radiation Protection Computer System (RPC)

  6. Radiological Controlled Area (RCA) APD GB -Personal ID information -Past doses Exposure Individual doses (including past doses) Whole body surface contamination monitor + APD APD dose > Alarm RPC Administrative level -Exposure evaluation report -Daily dose report WBC GB Evaluation Dose Measure every month Tracking exposure dose in Shika preservation Check

  7. Work dose management 《 Plan 》 ・Establish measures (exposure reduction measures) to keep the workers’ dose as low as rationally achievable ・Establish a planned dose based on the radiation environment of the workplace ・Set the APD alarm level 《 Do 》 ・Conduct work ・Implement exposure reduction measures 《 Action 》 ・Review the calculation method of the planned dose ・Review the exposure reduction measures 《 Check 》 ・Compare the actual dose and planned dose ・Check the effects of the exposure reduction measures Continue improvements, aiming for even better exposure reduction

  8. RPC Work dose management RCA Work plan -Planned dose -APD alarm level Selection of work Setting the APD alarm level APD Work information Input Device (WID) Exposure Work1 Planned dose Work1:○○ Work2:×× Whole body surface contamination monitor Selection of work Setting the APD alarm level Actual work dose Work1:△△ Work2:□□ APD Work2 Exposure -Exposure evaluation report -Daily dose report Check

  9. Devices used for individual dose management and work dose management ・Dose count for each individual ・Check whether administrative dose level has been exceeded Whole Body Counter (WBC) Glass Badge (GB) Evaluation Alarm Pocket Dosimeter (APD) Radiation Protection Computer System (RPC) Whole body surface contamination monitor ・Dose count for each work ・Comparison between actual dose and planned dose Entrance/Exit Processing System Work information Input Device (WID)

  10. Overview of the entrance/exit processing system at the Shika Nuclear Power Station ID card APD Whole body surface contamination monitor APD (WID) APD

  11. Entry qualification determination and ID card Workers that need to enter the RCA are given an ID card that proves that they have permission to enter the RCA. An IC chip is embedded into the ID card, and information regarding the permission to enter into the RCA, etc, is registered onto the IC chip. When entering the RCA, the ID card must be shown to the surveillance agent at the entrance of the RCA. 11

  12. Overview of the control access system at the Shika Nuclear Power Station ID card APD Whole body surface contamination monitor APD (WID) APD 12

  13. （Feature 1）The APD makes the entry qualification determination ◎The APD determines whether permission to enter the RCA has been granted when the ID card is inserted into the APD. (Entry qualification determination) Load the ID card onto the dosimeter The dosimeter scans the work information ID card Entry qualification information ・　Name ・　Entry qualification flag Entry qualification determination It is possible to enter the controlled area quickly. 13

  14. （Feature 2）It does not take trouble to register work information to the WID Alarm Pocket Dosimeter Radiation Protection Computer System (RPC) Work information ・The installation location can be changed freely. Work information ・　Name ・　Work subject ・　APD alarm setting ID card Work information Work information Dose record Work information Work information WID Whole body surface contamination monitor Work information Body contamination inspection Scanning of the dose record Work subject selection Alarm level setting Selected subject alarm setting Dose record ID card data scanning 14

  15. Functions of the entrance/exit processing system 15

  16. Conclusion The Shika Nuclear Power Station conducts detailed dose management using the radiation protection computer system and the control access system. The control access system of the Shika Nuclear Power System is designed to reduce the burden on managers and workers when realizing detailed dose management. 16

  17. Thank you for your attention !! Shika Nuclear Power Station 17

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