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題名 | 蒸汽產生器管束非破壞檢測評估之探討=The Assessment of Nondestructive Inspection for Steam Generator Tubing |
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作者 | 余明昇; 徐秀北; 吳燕輝; 黃縕華; 張文帆; 楊海明; 李紹喜; 童振昌; | 書刊名 | 台電工程月刊 |
卷期 | 697 民95.09 |
頁次 | 頁134-141 |
分類號 | 440.23 |
關鍵詞 | 蒸汽產生器; Inconel 600管件; 渦電流檢測; 應力腐蝕龜裂; 旋轉式煎餅探頭; Steam generator; Inconel 600 tubing; Eddy current inspection; Stress corrosion cracking; SCC; Motorized rotate pancake coil; MRPC; |
語文 | 中文(Chinese) |
中文摘要 | 本文主要是針對核電廠蒸氣產生器管束非破壞檢測的結果,以金相破壞檢測進行比對。一般而言,現階段渦電流非破壞檢測技術對於Inconel 600管束之檢測,尚有可靠度及精確度的疑慮。藉由實驗室製作的管內外及軸向和圓周向應力腐蝕裂縫的管件試樣,先以非破壞檢測法進行定位及評估瑕疵顯示之長度或深度的數據,再以顯微金相分析的技術,找尋相對應裂縫的精確方位及正確的裂縫長度或對應深度,並進而確認所使用渦電流檢測技術量測的精確度。結果顯示當量測之瑕疵顯示單純且沒有其他干擾時,軸向裂縫深度高估約小於5%管壁厚,而圓周向裂縫深度的高估約小於13%管壁厚;但若附近有其他瑕疵顯示共同存在時,裂縫深度評估不準度則相當的大。此外,對於內管壁裂縫深度評估時,不僅要注意渦電流信號之相位,還須注意信號之電位值,也就是說當信號電位值小於1.29 Volt時,很可能並無應力腐蝕裂縫存在。 |
英文摘要 | This report focuses mainly on the evaluation and quantification of nondestructive inspection for steam generator tubing. In general, the inspection reliability and inspection accuracy are still ambiguous when utilizing eddy current (EC) inspection for Inconel 600 tubing. This study shows the production of SCC cracks, on both outside and inside surface of Inconel 600 tubes, and then they are firstly evaluated with respect to the location and sizing of flaw by utilizing Non-destructive inspection. The results of cracking's parameters are then validated by the conduction of inspection and destructive evaluation of those degraded tubing. The evaluation accuracy then is extracted through the comparison of cracking's parameters obtained on both techniques. The results show that the eveluation of depth is overestimating below 5% through wall thickness for axial cracking and below 13% for circumferential one when both indications are simple and are not interfered. Otherwise, the evaluation uncertaintywould be very high when interference occurred due to other factors, i.e. denting, roughness, corrosion and pitting. Nevertheless, the evaluation of cracking depth for cracking on the inside surface based not only on the observed phase angle response of output signal of EC, but also on its voltage response of EC. Those indications with inspection voltage are smaller than 1.29 Volt, which probably indicates that there is no existence of SCC on this inside surface of tubing. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。