A study on pressurizer cutting scenario for radiation dose reduction for workers using VISIPLAN
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초록
The operations in the design lifecycle of a nuclear power plant targeted to be decommissioned lead to neutron activation. Operations in the decommissioning process include cutting, decontamination, disposal, and processing. Among these, cutting is done close to the target material, and thus workers are exposed to radiation. As there are only a few studies on pressurizers, there arises the need for further research to assess the radiation exposure dose. This study obtained the specifications of the AP1000 pressurizer of Westinghouse and the distribution of radionuclide inventory of a pressurizer in a pressurised water reactor for evaluation based on literature studies. A cutting scenario was created to develop an optimal method so that the cut pieces fill a radioactive solid waste drum with dimensions 0.571 m 0.834 m. The estimated exposure dose, estimated using the tool VISIPLAN SW, in terms of the decontamination factor (DF) ranged from DF-0 to DF-100, indicating that DF-90 and DF-100 meet the ICRP recommendation on exposure dose 0.0057 mSv/h. At the end of the study, although flame cutting was considered the most efficient method in terms of cutting speed, laser cutting was the most reasonable one in terms of the financial aspects and secondary waste
Abstract
The operations in the design lifecycle of a nuclear power plant targeted to be decommissioned lead to neutron activation. Operations in the decommissioning process include cutting, decontamination, disposal, and processing. Among these, cutting is done close to the target material, and thus workers are exposed to radiation. As there are only a few studies on pressurizers, there arises the need for further research to assess the radiation exposure dose. This study obtained the specifications of the AP1000 pressurizer of Westinghouse and the distribution of radionuclide inventory of a pressurizer in a pressurised water reactor for evaluation based on literature studies. A cutting scenario was created to develop an optimal method so that the cut pieces fill a radioactive solid waste drum with dimensions 0.571 m 0.834 m. The estimated exposure dose, estimated using the tool VISIPLAN SW, in terms of the decontamination factor (DF) ranged from DF-0 to DF-100, indicating that DF-90 and DF-100 meet the ICRP recommendation on exposure dose 0.0057 mSv/h. At the end of the study, although flame cutting was considered the most efficient method in terms of cutting speed, laser cutting was the most reasonable one in terms of the financial aspects and secondary waste
참고문헌 (21)
- Boris Remenec, "Determination of difficult to measure radionuclides in primary circuit facilities of NPP V1 Jaslovske Bohunice", Journal of Radioanalytical and Nuclear Chemistry, 298(3), pp.1879~1884 (2013), Springer Science and Business Media LLC[DOI]
- Primary Circuit Contamination in Nuclear Power Plants: Contribution to Occupational Exposure, "H. Provens", Institut de radioprotection et de surete nucleaire, ~ (2004)
- Ropert Prince, Radiation protection at Light Water Reactors, "Bearbeitet von", ~ (2012)
- T. B. Yoon, "A Study on Corrosion Product Behavior and Mechanism in Domestic Nuclear Power Plants by Using CRUDTRAN", pp.2015
- Derivation of Chemical Treatment Conditions during Reactor Shutdown to Remove CRUD on the Primary Side of Domestic PWR (1), "K. U. Sung", Korean Nuclear Society, ~ (1996)
- J. M. Pietralik, "The role of flow in flow-accelerated corrosion under nuclear power plant conditions", E-Journal of Advanced Maintenance, 4(2), pp.63~78 (2012)
- A State of the Art Report on Technologies of a Safety Assessment and a Radioactivity Exposure Assessment for the Decommissioning Process of Nuclear Facilities, "K.S. Jung", Korea Atomic Energy Research Institute, ~, pp.KAERI (2007), AR-782[DOI]
- Martin Hornacek, "Calculation of External Exposure during Dismantling and Segmentation of Steam Generator", IAPGOS
- J.W. Winters, "AP1000 Design Control Document Revision 18", pp.1~23 (2004), Westinghouse electric company LLC
- Research of PWR Pressurizer Insurge Characteristics on Three-Dimensional Transient Modeling, "Jianquan Liu", Science and Technology of Nuclear Installations, ~ (2018)
- "Westinghouse Technology Systems Manual, Rev 10", 08, Section 2.1, USNRC HRTD, 2008
- "Tests and Improve Nuclear Heating Solution, THERMOCOAX NUCLEAR"[URL]
- Y. H. Jung, "Development of Evaluation Technology for the Decommissioning Method of Nuclear Power Plant Core Facilities e Final Report", Korea Atomic Energy Research Institute (2013)
- Regulation on Radioactive Waste Management and Guidelines on the Collection, Packing, and Management of Radioactive Waste, "I.S. Kang", Korea Atomic Energy Research Institute, ~, pp.KAERI (2005), TR-2902[DOI]
- T.J. Boal, "Dose Limits to the Lens of the Eye: International Basic Safety Standards and Related Guidance", ICRP 2013 Proceedings, pp.112~117 (2013)
- 최귀남, "방사선관계종사자의 피폭선량에 대한 연구", 한국방사선학회논문지, 6(1), pp.27~37 (2012), 한국방사선학회
- C. D. Park, "Development of Metal Cutting Technologies for Decommissioning Nuclear Facilities", Korea Institute of Machinery & Materials (2019)
- 송종순, "방사성 오염 토양의 효율적 복원을 위한 처리기술 평가 연구", Journal of Nuclear Fuel Cycle and Waste Technology, 14(3), pp.245~251 (2016), 한국방사성폐기물학회[DOI]
- S. I. Kim, "Evaluation of Internal Exposure to Radioactive Aerosol generated from plasma melting system using BiDAS code", Radiat. Protect. Dosim, 194(1), pp.9~17 (2021)[DOI]
- 김선일, "A study on characteristics and internal exposure evaluation of radioactive aerosols during pipe cutting in decommissioning of nuclear power plant", Nuclear Engineering and Technology, 50(7), pp.1088~1098 (2018), 한국원자력학회
- Study on the State of the Arts Technologies and Policy Trends for the Decommissioning of Nuclear Installations and Facilities, "K.J. Kang", Korea Atomic Energy Research Institute, ~, pp.KAERI (2005), RR-2608[DOI]