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題 名 | BWR電廠微鹼水化學運轉條件研究=Effects of Alkaline Water Chemistry on BWR Operation |
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作 者 | 王立華; 許天佑; 黃佳伸; | 書刊名 | 台電工程月刊 |
卷 期 | 620 2000.04[民89.04] |
頁 次 | 頁21-32 |
分類號 | 449.7 |
關鍵詞 | 沸水式核能電廠; 微鹼水化學; 應力腐蝕龜裂; 交流阻抗測量; 再鈍化電流測量; Boiling water reactor; Alkaline water chemistry; Stress corrosion cracking; AC impedance measurement; Repassivation current measurement; |
語 文 | 中文(Chinese) |
中文摘要 | 近幾年來沸水式核能電廠 (Boiling Water Reactor,BWR)的水質導電度大 輻降低,裂縫尖端pH值可能轉呈微鹼性。裂縫尖端呈鹼性對IGSCC的影響,在目 前的研究中非常缺乏。再者,近年來瑞典、日本的研究報告初步發現:提高BWR 電廠飼水的PH值(在弱鹼性範圍內)可降低管線的輻射場增建。因此在BWR微鹼水 化學下研究不�袗�材料的電化學性質及裂縫成長速率,實有其必要性。 本計畫使用Type 304不�袗�,分別在高溫正常水質 (200 ppb O�砥Aneutral pH25)及 微鹼水質 (200 ppb O��,pH25=8.0,添加KOH)中,測量其裂縫成長速率的差異;並 進行交流阻抗測量及鈍化速率測量等電化學實驗,進一步瞭解不�袗�在微鹼水化 學下的氧化膜特性。另外並審閱整理瑞典、日本及德國的微鹼水化學研究資料。 |
英文摘要 | Increasing pH of reactor water to mildly alkaline is considered as one ofthe BWR water chemistry strategies to reduce the active release ofradioactive oxides and suppress the growth rate of stress corrosion cracking.Howeyer, only limited experimental data are currently available in the published literature, it is imperative to perform additional tests to verify theeffectiveness of slightly alkaline reactor water. Because the electrochemical behavior and SCC are intricately related, thisstudy will attempt to investigate the electrochemical properties and measurethe crack growth rates (CGRs) of type 304 stainless steel (SS) in bothnormal (200ppb O��, neutral pH25) and alkaline water chemistry (200ppb O��,pH25= 8.0). The additive for pH control is potassium hydroxide (KOH). Thecrack growth rate was monitored by reversing DC potential drop technique.The electrochemical measurements, including AC impedance measurementand potential pulsing test, were employed to measure the repassivationbehavior. Besides, the research results performed by Sweden, Japan andGermany were reviewed. The characteristics of electrochemical propertiesin BWR alkaline environments and its effect on stress corrosion crackinghave been further examined. |
本系統中英文摘要資訊取自各篇刊載內容。