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題 名 | 壓水式核電廠鎳基合金銲道之龜裂問題研究(2)--Alloy 182 PWSCC 裂縫成長速率測量及結構安全評估=Review on Cracking Cases and Regulatory Requirements of Crack Growth Measurements and Structural Safety Analyses of Alloy 182 Components(Ⅱ) |
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作 者 | 王立華; 黃忠梅; 李日輝; | 書刊名 | 台電工程月刊 |
卷 期 | 695 民95.07 |
頁 次 | 頁1-17 |
分類號 | 449.7 |
關鍵詞 | 軸向裂縫; 裂縫成長速率; 環向裂縫; 控制棒驅動機構; 臨界裂縫; 裂縫成長速率評估曲線; 線彈性破壞力學分析; 極限負載分析; 穿越管; 壓水式反應器; 正反向直流電壓降測量法; 反應爐頂蓋; 應力腐蝕; 應力強度因子; Axial crack; Crack growth rate; CGR; Circumferential crack; Control rod drive mechanism; CRDM; Critical crack length; Disposition curve; Linear elastic fracture mechanics; LEFM; Limit load analysis; Penetration; Pressurized water reactor; PWR; Reversing DC current potential drop monitoring; RDC; Reactor vessel head; RVH; Stress corrosion crack; SCC; Stress intensity factor; |
語 文 | 中文(Chinese) |
中文摘要 | 近年來國外核能電廠在鎳基合金及其焊道上屢屢發現龜裂,針對這一連串鎳基合金及其焊道之龜裂問題,美國核管會陸續發佈通告(NRC Bulletin),提醒電廠注意並要求電廠提出適當的檢測計畫。但是有關鎳基合金焊材在壓水式核能電廠一次側環境中龜裂行為的研究卻極為有限,相關的龜裂檢測技術也亟待發展。 本計畫目的首先希望瞭解鎳基合金焊道在核三廠一次側分布的範圍;在實驗室中測量鎳基合金焊材在壓水式核電廠一次側環境中龜裂的成長速率;並選用適當的非破壞檢測技術,建立相關的檢測參數;最後建立缺陷發現後的結構完整性評估方法。希望可以協助電廠評估鎳基合金焊道龜裂問題可能影響的範圍,使用適當的非破壞檢測技術及檢測參數,適時檢出鎳基合金焊道的缺陷;在缺陷發現後,並能根據量測的龜裂成長速率評估結構完整性。 本文針對缺陷發現後的結構安全性評估方法、Alloy 182 PWSCC龜裂成長速率測量提出報告,有關Alloy 182焊道相關資料蒐集與整理及模擬管口銲道試塊之設計製作與超音波檢測則將另撰專文說明。 結構安全性評估選擇頂蓋穿越管為分析對象,模擬建廠製造安裝過程,以1/8的RPV頂蓋建立3-D的有限元素模型,建立殘留應力分析的方法。線彈性破壞力學方法計算結果,在J-焊道附近,穿越管Downhill外側位置,假設深長比為0.4的軸向裂縫,其臨界裂縫深度為0.37 in(占壁厚59%)。360度環向裂縫推算之臨界裂縫深度為0.51 in(占壁厚81%)。極限負載研究方法結果,在正常/暫態運轉的負荷下,環向穿壁裂縫的安全極限為256°。 Alloy 182 PWSCC龜裂成長速率量測值,與MRP-21、MRP-115、JNES、EdF、及Swedpower各處置曲線比較,驗證結果各處置曲線均有足夠保守度,而選擇MRP-115處置曲線較有利。Aloy 182在模擬PWR一次測環境下,不同溫度(290℃、310℃、340℃)中的裂縫成長速率,依阿瑞尼亞士定律推導出裂縫成長活化能約121 KJ/mole。 |
英文摘要 | Nickel-based welds were used frequently to connect dissimilar-metal components in Pressurized Water Reactor (PWR). The weld materials used in these connections were alloy 182 or alloy 82. Increasing number of cracking incidents of nickel-based alloys and welds have been observed in foreign nuclear power plants (NPP) within recent years. The US Nuclear Regulatory Commission (NRC) issued Information Notices, Bulletins, and even Orders to request all utilities to raise concerns about the potential safety implications and prevalence of cracking in the recent discoveries of cracks and leaking in these Ni-based welds. The fore-mentioned cracking cases remind us that the primary water cracking problem has occurred not only in Ni-based metal, but also extended to Ni-based weld materials. However, the study on the cracking behavior of nickel based weld materials in PWR primary water was very limited. The development of inspection techniques capable of finding these crack was also required. Therefore, it is important to collect the information of Alloy 182 weld cracking and review the scope and regime where the nickel-based weld materials were used and distributed in the Maanshan NPP in the first step. The second task in this project would be the measurement of crack growth rate of nickel -based weld in PWR primary environment which was simulated in the laboratory. Thirdly, we will evaluate the proper non-destructive inspection techniques and then attempt to develop the appropriate testing parameters used for this technique. Finally, the integrity evaluation methodology will be included in this project and will be applied for the case if cracks were detected. This paper will address the topics of the crack growth rate measurement and the structural integrity evaluation of nickel-based weld in PWR primary environment. Other subjects included in this project will be proposed in other papers. |
本系統中英文摘要資訊取自各篇刊載內容。