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RMS alarm under IHA decontamination

RMS alarm under IHA decontamination. 2012. 9. 25. Korea Hydro & Nuclear Power. Shin-Kori Nuclear Power Plant. INTRODUCTION. During the Operation, Occurring the Radiation Particle. Appropriate Protection. Dose reduction. Protection from Internal Exposure. As Low As Resonably Achievable.

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RMS alarm under IHA decontamination

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  1. RMS alarm under IHA decontamination 2012. 9. 25 Korea Hydro & Nuclear Power Shin-Kori Nuclear Power Plant

  2. INTRODUCTION During the Operation, Occurring the Radiation Particle Appropriate Protection Dose reduction Protection from Internal Exposure As Low As Resonably Achievable

  3. INTRODUCTION Title : IHA Cleaning operation Period : 2012. 1. 26 ~ 2012. 1. 28 Purpose : Removal of the foreign substance attached to IHA Operation personnel : 12person

  4. WORK PLACE P/H S/G cavity B UCSA & upper Air Plenum Area refueling pool area E/H S/G cavity A IHA storage Area

  5. Dry Ice Cleaning Theory

  6. Dry Ice Features 1. Sublimate Material 2. Carbon Dioxide Created by Compressing and Cooling 3. Liquefied At a Low Temperature 4. Sublimation as to supply heat to the surround and foreign objects fall as expended

  7. Work Procedure 1. Spray DryIce on the IHA 2. The operator wears a mask 3. Work environment Spatial Dose = 5μSv/hr, No airborne particle 4. Work with the Radiation Safety Manager

  8. Attached Boric acid

  9. Cleaning of Boric acid

  10. Cleaning internal IHA LCSA Cleaning

  11. Radiation Monitor Alarm During the Dryice spray, Alarm occurs in the Radiation Monitoring System(RMS) The alarm Caused by Radioactive particle Radioactive Particles blow into the air with the dryice Workers complete the decontamination, and leave the workplace Airsampling is Performed, Checking Exposure

  12. RMS Alert / High

  13. RMS Line Drawing

  14. Precaution

  15. Precaution 1. Tent is installed in the workspace 2. Workers are wearing a mask 3. Discharged to the outside from inside the tent through the air ventillation 4. More Clothes on the outside, In order to prevent additional contamination

  16. Results 1. Workers are not internal Exposure 2. Total External Dose = 0.9man-mSv(total : 10person) This Dose is due to the spatial dose 3. IHA thoroughly cleaned 4. Radiation Monitoring System was normal operation

  17. Comparison on decontamination Before work / After work

  18. Conclusion 1. Radioactive Particle Floats in the Air. It causes Internal exposure. 2. Maybe necessary Paricles occuring in the workplace should not be entered into the human body 3. IMA cleaning need something like the size of the tent because of the size and installed to perform the operation.

  19. Thank You !

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