A Field Test Assessment on the Extremity Doses of Highly-Exposed Radiation Workers During Maintenance Periods at Nuclear Power Plants in Korea

원전 계획예방정비기간 고피폭 접촉작업에서 방사선작업종사자의 말단선량 평가 현장시험

  • Received : 2009.12.18
  • Accepted : 2010.05.14
  • Published : 2010.06.30

Abstract

Maintenance on the water chamber of steam generator, the change of pressurizer heater, the removal of pressure tube feeder, and so on during outage in nuclear power plants (NPPs) has a likelihood of high radiation exposure to whole body of workers even short time period due to the high radiation exposure rates. In particular, it is expected that hands would receive the highest radiation exposure because of its contact with radiation materials. In this study, field tests on extremity dose assessment of radiation workers for contact works with high radiation exposure were conducted during the maintenance periods in Korean pressurized water reactors (PWRs) and pressurized heavy water reactors (PHWRs). In this field test, radiation workers were required to wear additional TLDs on the back and wrist, and an extremity dosimeter on fingers including a main TLD on the chest, while performing maintenance. As a result, it was found that the equivalent dose for fingers was distributed in the fixed range of deep dose and the equivalent dose for wrists.

References

  1. International Atomic Energy Agency. Basic Safety Standards for Protection against Ionizing Radiation and for the Safety of Radiation Sources. IAEA Safety Series No. 115, Vienna, 1996.
  2. Institute of Nuclear Power Operations. Guidelines for Radiological Protection at Nuclear Power Stations. INPO 91-014(Revision 01), 1995.
  3. 교육과학기술부. 고시 제2008-31호: 방사선방호등에 관한 기준 고시. 2008.
  4. 김희근, 공태영. 원전 불균일 방사선장하에서 유효선량 평가를 위한 복수선량계 알고리즘 적용방안연구. Journal of Radiation Protection 2008;33(4): 151-160.
  5. Ocken H. Techniques for Controlling Radiation Exposure. Nuclear News 1993 Feb;43-47.
  6. 교육과학기술부. 고시 제2008-48호: 판독업무 등록 기준 및 검사 규정. 2008.
  7. 한국수력원자력(주). 2008 방사선관리연보. 2009.
  8. International Commission on Radiological Protection. 1990 Recommendations of the International Commission on Radiological Protection. ICRP Publication 60. Pergamon Press, 1991.
  9. 한국수력원자력(주). 원전종사자 말단선량계 말단 선량계 방사선량 측정 평가 기술개발 최종보고서. 2009.
  10. 김희근, 공태영. 원전종사자의 말단선량 평가를 위한 고피폭 접촉 방사선장 특성분석. Journal of Radiation Protection 2009;34(4):176-183.
  11. 한국원자력안전기술원. KINS 안전규제 기준 및 지침(안): 13.3 개인선량계. 2009.
  12. World Association of Nuclear Operators. Guidelines for Radiological Protection at Nuclear Power Plants. WANO GL 2004-01, 2004.
  13. Yoon YH. Shielding Establishment inside Steam Generator, Proceedings of Information System on Occupational Exposure. Asian ALARA Symposium, 2007.
  14. 한전전력연구원. 원전 고피폭 접촉작업의 방사선장 특성분석 및 말단선량 현황분석 보고서. TM.S04. P2009.0190, 2009.