功率提昇對BWR電廠管路薄化位置影響之研究

Analyzing the Impacts of Power Uprate on the Distributions of Erosion Corrosion Wear Sites for a BWR

洪遵復(Tsun-Fu Hung)

指導教授 ： 施純寬 ； 白寶實 ； 馮玉明

國立清華大學/原子科學院/工程與系統科學系/碩士(2008年)

https://doi.org/10.6843/NTHU.2008.00220

摘要

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

關鍵字

功率提昇 ； 計算流體力學 ； 沖/腐蝕

並列摘要

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.

並列關鍵字

Power Uprate ； CFD ； Erosion-Corrosion

參考文獻

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”,

11. Copson. H. R., “ Effects of Velocity on Corrosion”,Corrosion