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[국내논문] ABRASIVE BLASTING TECHNOLOGY FOR DECONTAMINATION OF THE INNER SURFACE OF STEAM GENERATOR TUBES 원문보기

Nuclear engineering and technology : an international journal of the Korean Nuclear Society, v.43 no.5, 2011년, pp.469 - 476  

Kim, Gye-Nam (Korea Atomic Energy Research Institute) ,  Lee, Min-Woo (Korea Atomic Energy Research Institute) ,  Park, Hye-Min (Korea Atomic Energy Research Institute) ,  Choi, Wang-Kyu (Korea Atomic Energy Research Institute) ,  Lee, Kune-Woo (Korea Atomic Energy Research Institute)

Abstract ▼ AI-Helper 아이콘AI-Helper

The inner surfaces of bundled inconel tubes from steam generators in South Korean nuclear power plants are contaminated with cobalt and abrasive blasting equipment has been developed to efficiently remove the cobalt. The principal parameters related to the efficient removal using this equipment are ...

Keyword

#Abrasive Blasting   #Decontamination   #Cobalt   #Steam Generator   #Inconel Tube  

AI 본문요약
AI-Helper 아이콘 AI-Helper

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제안 방법

  • The tubes were disassembled after the experiment to measure the erosion weight that resulted from the dry abrasive blasting. The experiments were conducted for 3, 6, and 9 minutes for both the new and oxidized inconel tubes. Also, the air compressor uniformly supplied 5 atmospheric pressures to the nozzle.
  • Based on the experimental results of the non-radioactive inconel samples, abrasive blasting experiments using radioactive inconel samples were performed. The radioactive inconel samples were extracted from retired steam generator and the main nuclide of the radioactive inconel samples was 60Co.

대상 데이터

  • Figure1 shows the Kori- 1 steam generator from the Kori nuclear power plant in South Korea. It consists of 3,388 sets of long, slim inconel tubes. The specifications of the bundled inconel tubes in Kori- 1 are shown in Table 1.
  • To decontaminate the inner surfaces of long, slim inconel tubes in the retired steam generators, KAERI designed the abrasive blasting equipment. The designed abrasive blasting equipment consists of a nozzle, protection room, cyclone, cyclone pan, dust collector, abrasive storage tank, and air compressor as shown in the 2D diagram presented in Figure 2. The inner surface of a contaminated inconel tube can be decontaminated using the abrasive particles that are released from the nozzle.
  • The radioactive inconel samples were extracted from retired steam generator and the main nuclide of the radioactive inconel samples was 60Co. The experiments with the radioactive inconel samples were performed in the Kori1 nuclear power plant. Radioactive inconel samples with a length of 3 cm were inserted into a connecting tube between two stainless steel tubes and positioned at 1 m, 3 m, 5 m, 7 m, and 9 m.
  • The experiments with the radioactive inconel samples were performed in the Kori1 nuclear power plant. Radioactive inconel samples with a length of 3 cm were inserted into a connecting tube between two stainless steel tubes and positioned at 1 m, 3 m, 5 m, 7 m, and 9 m.
  • Meanwhile, the new and oxidized inconel tube samples were manufactured to be 3 cm long, due to the difficulties in manufacturing oxidized inconel samples in an autoclave. The 3 cm long inconel sample was inserted into a 6 long connecting tube for the abrasive blasting experiment and the connecting tube was joined between two stainless steel tubes at 1 m, 2 m, 3 m, and 4 m, respectively (see Figures 3 and 5). The lengths of five pieces of stainless steel tubes were approximately 1 m.

이론/모형

  • The radioactivity of the radioactive inconel sample was measured using a multi-channel analyzer (MCA) with a standard tube of 50 cc, QCY48 (Amersham), manufactured by Korea Reach Institute Standards and Sciences (KRISS). The MCA is operated in the pulse height analyzer mode.
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참고문헌 (15)

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    상세보기

  2. M. Dundar, O.T. Inal, J. Stringer, "The effect of particle size on the erosion of a ductile material at the low particle size limit," Wear, 233-235 (1999). 

  3. G.P. Tilly, W. Sage. "The interaction of particle and material behavior in erosion processes," Wear, 16 (1970). 

  4. M. Buijs, "Erosion of glass as modeled by indentation theory," J. Am. Ceram. Soc., 77 (1994). 

    상세보기

  5. P.J. Slikkerveer, P.C.P. Bouten, F.H. int't Veld, H. Scholten, "Erosion and damage by sharp particles," Wear, 217,2 (1998). 

  6. P.J. Slikkerveer, "Mechanical etching of glass by power blasting," PhD Thesis, Eindhoven University of Technology, (1999). 

  7. E. Bolloy, S Thurre, E. Walckiers, A. Sayah, M.A.M. Gijs, "Powder blasting as a new technology for intertial sensor fabrication," Proc. 13th European conference on soild-state sensor , The Hague, The Netherlands, Sep. 12-15, 1999. 

  8. E. Belloy, S. Thrre, E. Walckiers, A. Sayah, M. A. M. Gijs, "The introduction of powder blasting for sensors and microsystem applications," Sens. Actuators, A 84 (2000). 

  9. T.S. Baller, G.G. P. van Gorkom, N. Nambert, E.A. Montie P.H.F. Trompenaars, S.T. de Zwart, "Construction and physical processings of Zeus panels," Philips J. Res., 50 (1996). 

  10. J. Li, I.M. Hutchings, "Resistance of cast polyurethane elastomers to solid particle erosion," Wear, 135 (1990). 

  11. P.J. Slikkerveer, M.H.A. van Dongen, F.J. Touwslager, "Erosion of elastomeric protective coating," Wear, 236 (1999). 

  12. P.J. Slikkerveer, P.C.P. Bouten, F.C.M. de Haas, "High quality of brittle materials by powder blasting," Sensors Actuators, 85 (2000). 

  13. H. Wensink, H.V. Jansen, J.W. Berenschot , M.C. Elwenspock, "Mask materials for powder blasting," J. Micromech. Microeng., 10 (2000). 

    상세보기

  14. H. Wensink, J.W. Berenschot, H. V. Jansen, M.C. Elwenspoek, "High resolution powder blast micromachining," Proc. Int. Conf. Micro Electro mechanical Systems (MEMS-2000), Miyazaki, Japan, Jan 23-27, 2000. 

  15. G. Krause, "Concepts for treatment and recycling of Steam Generators and other big components from operation and decommissioning of nuclear facilities", International Nuclear Forum, 6TH - 8TH, Varna, Bulgaria, 2007 

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