Corrosion Science and Technology

  • 제17권6호
  • /
  • Pages.317-323
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  • 2018
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  • 1598-6462(pISSN)
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  • 2288-6524(eISSN)
한국부식방식학회 (The Corrosion Science Society of Korea)
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CHECWORKS와 ToSPACE 프로그램의 배관감육 해석결과 비교

Comparison of Wall Thinning Analysis Results between CHECWORKS and ToSPACE

  • 황경모 (한국전력기술(주) 재료기술그룹) ;
  • 윤훈 (한국전력기술(주) 재료기술그룹) ;
  • 서혁기 (한국전력기술(주) 재료기술그룹)
  • 투고 : 2018.10.23
  • 심사 : 2018.11.14
  • 발행 : 2018.12.31
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초록

Assumptions have always been that wall thinning on the secondary side piping in nuclear power plants is mostly caused by Flow-Accelerated Corrosion (FAC). Recent studies have showed that wall thinning on the secondary side piping is caused by Liquid Droplet Impingement Erosion (LDIE), Solid Particle Erosion (SPE), cavitation, and flashing. To manage those aging mechanisms, several software such as CHECWORKS, COMSY, and BRT-CICERO have been used in nuclear power plants. Korean nuclear power plants have been using the CHECWORKS program since 1996 to date. However, many site engineers have experienced a lot of inconveniences and problems in using the CHECWORKS program. In order to work through the inconveniences and to remedy problems, KEPCO-E&C has developed a "3D-based pipe wall thinning management program (ToSPACE)" based on the experience of over 30 years in relation to the pipe wall thinning management. This study compares the results of FAC and LDIE analysis using both the CHECWORKS and ToSPACE programs with respect to validation of the wall thinning analysis results.

키워드

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Fig. 1 DB construction and 3D display using CHECWORKS program.

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Fig. 2 DB construction and 3D display using ToSPACE program.

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Fig. 3 NFA Boundary Condition.

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Fig. 4 NFA Evaluation Result.

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Fig. 5 Window for inputting Boundary Condition of ToSPACE.

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Fig. 6 Comparison of Pressure in Single-Phase Fluid.

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Fig. 8 Comparison of Velocity in Single-Phase Fluid.

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Fig. 7 Comparison of Enthalpy in Single-Phase Fluid.

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Fig. 9 Comparison of Wear Rate in Single-Phase Fluid.

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Fig. 10 Comparison of Steam Quality in Two-Phase Fluid.

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Fig. 12 Comparison of Enthalpy in Two-Phase Fluid.

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Fig. 11 Comparison of Pressure in Two-Phase Fluid.

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Fig. 13 Comparison of Velocity in Two-Phase Fluid.

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Fig. 14 Comparison of Wear Rate in Two-Phase Fluid.

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Fig. 15 Comparison of LDIE Rate in Two-Phase Fluid.

Table 1 Boundary conditions for FAC and LDIE analyses

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Table 2 Comparison of single-phase analysis results between CHECWORKS and ToSPACE

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Table 3 Comparison of two-phase analysis results between CHECWORKS and ToSPACE

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참고문헌

  1. NRC Bulletin 87-01, Thinning of Pipe Walls in Nuclear Power Plants (1987).
  2. NISA/METI Press Release, Automatic Shutdown of Unit 3 - 4th Report, Maeda and Amano (2004).
  3. EPRI, Recommendations for an Effective Flow-Accelerated Corrosion Program(NSAC-202L-R4), EPRI Report 3002000563, Palo Alto, CA (2013).
  4. F. J. Heymann, J. Appl. Phys., 40, 5113 (1969). https://doi.org/10.1063/1.1657361
  5. K. M. Hwang, H. K. Seo, C. K. Lee, and W. C. Nam, World J. Nucl. Sci. Tech., 7, 1 (2017). https://doi.org/10.4236/wjnst.2017.71001
  6. K. M. Hwang and D. Y. Lee, Corros. Sci. Tech., 11, 218 (2012). https://doi.org/10.14773/cst.2012.11.6.218