現階段核電廠以提昇功率為首要工作，以期能夠發揮更大的效能，然而功率提昇前有許多的問題要去探討。本論文以功率提昇後造成如工作溫度、進口流速等運轉條件改變對於管路薄化位置的影響為主要研究方向。以三維計算流體力學 (Computational Fluid Dynamics，CFD) 程式為工具（FLUENT）模擬管路中流場的分佈，利用不同的沖/腐蝕指標來表示薄化位置分佈的情形。同時，探討功率提昇後運轉條件改變對薄化位置的影響。
根據核一廠管壁厚度量測的結果，我們得知在ES-7B管路系統即連結高壓汽機(H.P. Turbine)與汽水分離器(Moisture separator)間之管路為沖/腐蝕最嚴重的位置，因此選定此系統來評估。另一個評估的系統為核二廠 AG-23P管路系統，其為汽水分離器(Moisture separator)之再加熱器B(RHTR B)與加熱器B(RTR B)間之管路。
由模擬沖/腐蝕薄化位置的結果與量測數據比較後我們發現，即使電廠功率由原本的100％提昇至110％，薄化位置的改變仍然十分有限的，換言之，目前的管路系統檢測範圍並不需要因為功率提昇而有所改變

In this research, the possible influence of power uprate on the distribution characteristics of erosion-corrosion (E/C) wear sites is analyzed through the two-phase models. These models include the three-dimensional two-phase computational fluid dynamics (CFD) models and appropriate E/C models. Two boiling water reactor (BWR) are selected in the analytical works. Based on the simulation results, the present CFD models can precisely capture the two-phase phenomena within the piping system, which include centrifugal effect, gravitation effect and imbalance of phase and mass separation in a T-junction, etc. The appropriate E/C models coupled with the calculated two-phase flow structure can indicate the local distributions of severe E/C wear sites on the wall of fittings, which shows reasonable agreement with the plant measured results. With these models, the impacts of power uprate on the distribution characteristics of E/C wear sites can be investigated. Comparisons between the calculated results under 100%, 105%, and 110% power levels clearly reveal that the power uprate does not significantly affect the distribution characteristics of wear sites for the selected piping system, especially in the wear ranges.

1. “ Metals Handbood”9th ed, Vel 13,ASM Internation,1998.
2. G.A.Delp, J.D. Rebisono and M.T. Sedlack, “Erosion/Corrosion in Nuclear Power Steam Pipe：Causes and Inspection Program Guidelines”, EPRI-NP-3944, 1985.
3. “ Thinning of Pipe walls in Nuclear Power Plants” NRC Bulletin N0.87-01,1987.
4. “Erosion/Corrosion-induced Pipe Wall Thinning” NRC GL89-08,1987.
5. “核能電廠管路壁厚檢測計畫（修訂版）” 核能發電處，1994年10月.
6. V.D.Chera1,etaL “ Recommendations for an Effefective Flow-Accelerated Corrosion program”,NSAC-202L.1993.
7. J.G.A. Bitter, Wear, 6(1963), P.5
8. I.Finnie, “ Some Observations on the erosion of ductile metals”,Wear,19,81-90 (1972)
9. Finnie and D.H. McFadden “ On the velocity dependence of the erosion of ductile metals by solid particles at angles of incidence”Wear,48,181-190(1978).
10. M. E. Gulden, “ Pro.5th Int. Conf. On Erosion by Liquid and Solid Impact”,
Cambriged, Cambs., Cavendish Laboratory,Cambridge,1979,p.613.
11. Copson. H. R., “ Effects of Velocity on Corrosion”,Corrosion
16,130-136(1960).
12. G. Sundararajan and P. G. Shewmon, “ A new model for the erosion of
metals at
13. K.D. ,Efird “ Effect of Fluid Dynamics on the Corrosion of Copper Base
Alloys in Sea water” ,Corrosion 33.3-8(1977).
14. L. Schiller and Z. Naumann. Z. Ver. Deutsch. Ing., 77, 318, 1935.
15. S. Nesic. And J. Postlethwaite,“Erosion-Corrosion Under Distributed Flow Condition in Slurry Pipelines”,Corrosion/90.Paper 26,NACE,Houstion,Tx(1990)
16. 馬殷邦，”沖╱腐蝕原理探討與管路薄化率預估模式評估”，核能研究所，1997年7月
17. C.M. Rhie and W.L. Chow,“Numerical study of the turbulent flow past an airfoil with trailing edge separation,”AIAA J1,21,1527-1532(1983)
18. D.B. Spalding,“The calculation of Free-convection phenomena in Gasliquid Mixture”,I CHMT Seminar,Dubrovinik,1976.
19. Analyzing the Possible Impacts of Power Uprate on the Distributions of Erosion Corrosion Wear Sites for a BWR through CFD Simulation, Dr. Yuh-Ming Ferng, Department of Engineering and System Science National Tsing Hua University
20. “Analyzing the Impacts of Power Uprate on the Distributions of Erosion Corrosion Wear Sites for a BWR Through Two-Phase Models” Yung Shin Tseng, Yuh Ming Ferng
21. A.Bejan, July 1984,Convective Heat Transfer,John Wley&Sons.Inc.