核电厂安全壳钢衬里的腐蚀防护与控制初探
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摘要
安全壳钢衬里是防止核泄漏的第三道安全屏障,腐蚀是其主要老化机理之一。随着核电厂服役时间的增加,钢衬里腐蚀逐渐呈现上升的趋势,可能导致钢衬里的密封性下降,并影响核电厂的长寿期安全运行。根据国内外腐蚀事件及其检查数据,分析钢衬里的腐蚀机理和主要影响因素。为了有效探测与缓解钢衬里腐蚀带来的危害,展开了大面积快速扫描且能保持精度的钢衬里腐蚀检测初步技术研究。建议将超声检测纳入电厂钢衬里预防性检查,以降低钢衬里的腐蚀概率。
Containment is the third nuclear safety barrier to prevent the nuclear leakage.Containment liner corrosion is one of the main aging mechanisms.The liner′s corrosion rate may increase over service time and could induce the liner leakproofness degradation,and affect the long term safe operation of nuclear power plant(NPP).The liner corrosion mechanism and main influence factors were analyzed based on the data which have been reported.A primary research on the liner corrosion detection technology was performed.The application of ultrasonic test for liner could be brought into the preventive program of NPP for reducing the liner corrosion probability.
Containment is the third nuclear safety barrier to prevent the nuclear leakage.Containment liner corrosion is one of the main aging mechanisms.The liner′s corrosion rate may increase over service time and could induce the liner leakproofness degradation,and affect the long term safe operation of nuclear power plant(NPP).The liner corrosion mechanism and main influence factors were analyzed based on the data which have been reported.A primary research on the liner corrosion detection technology was performed.The application of ultrasonic test for liner could be brought into the preventive program of NPP for reducing the liner corrosion probability.
引文
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[2] Nuclear Regulatory Commission.Information notice2004-09:corrosion of steel containment and containment liner[R].Washington D.C.:Nuclear Regulatory Commission,2004.
[3] Nuclear Regulatory Commission.Information notice2010-12:containment liner corrosion[R].Washington D.C.:Nuclear Regulatory Commission,2010.
[4] Nuclear Regulatory Commission.Information notice2014-07:degradation of leak chase channel systems for floor welds of metal containment shell and concrete containment metallic liner[R].Washington D.C.:Nuclear Regulatory Commission,2014.
[5] DUNN D S,PULVIRENTI A L,HISER M A.Containment liner corrosion operating experience summary technical letter report-revision 1[R].[S.l.]:Nuclear Regulatory Commission,2011.
[6] JASON P P,DAN N,ALBERTO S S S L W,et al.Nuclear containment steel liner corrosion workshop-final summary and recommendation report[R].Albuquerque:Sandia National Laboratories,2011.
[7]王积明,付淼磊,钟翔.大亚湾核电站建/构筑物的腐蚀问题[J].腐蚀与防护,2005,26(8):358-360.
[8]刘新,时虎.钢结构防腐蚀和防火涂装[M].北京:北京化学工业出版社,2005.
[9] OLTRA R,KEDDAM M.Application of impedance technique to localized corrosion[J].Corrosion Science,1988,28(1):1-5.
[10] JONES D A.Principles and prevention of corrosion[M].Upper Saddle River:Prentice Hall,1996.
[11] SPENCER B W,PETTI J P,KUNSMAN D M.Riskinformed assessment of degraded containment vessels[R].New Mexico:Sandia National Laboratories,2006.
[12] PETTI J P,KALINICH D A,JUN J,et al.Effects of degradation on the severe accident consequences for a PWR plant with a reinforced concrete containment vessel[R].New Mexico:Sandia National Laboratories,2013.