电压互感器二次中心线接地方式的分析和改进

分析了电压互感器二次回路中心线电压产生漂移的原因，指出了现有的回路在某些特殊故障情况下的隐患，提出了中心线接线的改进方法和建议。     

分光光度法测定酿酒酵母细胞悬液浓度研究

采用分光光度法测定酿酒酵母(Saccharomyces cerevisiae)在不同生长条件、不同时间菌悬液OD600nm值,建立OD600nm在不同稀释区间的分段回归方程,利用OD600nm回归值绘制生长曲线,对比平板菌落计数法测得的生长曲线,研究在对数期与稳定期,OD600nm值与菌体数量以及稀释倍数的关系。结果表明,稀释前后OD600nm值在对应区间内呈线性关系,用OD600nm回归值绘制的生长曲线没有明显的衰亡期,其主要是由于在对数期以后OD600nm值与菌体数量不呈线性关系,而在稳定期以前两者线性良好;得到了OD600nm值在0.2~0.8范围内与细胞数量的对应关系,还发现实际OD600nm值与稀释倍数之间并不是简单的乘积关系,而呈幂函数关系。     

Performance of NiB inhibitor for PbSCC of alloy 600 in Pb-contaminated water and caustic solutions

Nickel-based iron-chromium alloys are used as steam generator (SG) tubing materials in nuclear power plants (NPPs) but experience intergranular stress corrosion cracking (IGSCC) and lead stress corrosion cracking (PbSCC) due to the harsh operating conditions of NPPs. In order to improve the integrity of SGs, many studies have sought suitable inhibitors for IGSCC, while those for PbSCC have been sought to a limited extent. In this study, the performance of nickel boride (NiB) as an inhibitor for PbSCC was evaluated. Nickel boride has been shown to be a good inhibitor for IGSCC of Alloy (or Inconel) 600 in a caustic aqueous solution containing no lead (Pb). No significant SCC was observed to occur in Alloy 600 tested in pure water under the slow strain rate test (SSRT) condition in this study. A mixed mode of IGSCC and TGSCC, however, occurred relatively easily in Alloy 600 tested in pure water containing lead oxide (PbO) at 315 °C. The susceptibility of Alloy 600 to SCC decreased with the addition of NiB, implying that NiB can be used as an inhibitor for PbSCC in Pb-contaminated water.     

600MW超临界一号机组整套试运分析

对贵州首台超临界机组分部试整套试运完成情况进行了的总结和分析。     

CAWS600系列自动气象站故障分析及排除方法

根据CWAS600系列自动气象站的系统结构和工作原理,将其故障分为：通信、电源供电系统、传感器、采集器四类故障。文章列举了几个典型故障的分析和处理方法。重点介绍了＂测量法＂,通过测量关键点的电信号,将故障进行分级判断和定位。熟悉这些典型故障的处理方法,可以大大提高自动气象站故障排除的时效性。     

疏水扩容器减温水管道强烈振动和高噪声分析

华能珞璜发电有限公司(珞璜电厂)三期2×600 MW机组疏水扩容器减温水管道存在强烈振动和高噪声的现象,试验分析认为,减温水喷管喷孔孔径偏大是造成减温水管道产生振动和高噪声的主要原因。通过对减温水喷管的喷孔数和孔径进行改进,成功消除了减温水管道的强烈振动和高噪声的问题。     

Initiation of SCC in nickel base alloys in primary PWR environment: studies at Studsvik since mid 1980s

Abstract

Investigations on initiation of primary water stress corrosion cracking (PWSCC) in alloys 600 and 690 in simulated primary pressurised water reactor (PWR) environments, carried out since 1985, are reviewed. A large number of tests, mostly on reverse U bend specimens, some from steam generator tubes from operating PWRs, have been conducted for periods up to 33 000 h (4 years). Most exposures were at 365 or 330°C in either high purity water with hydrogen addition or simulated primary water (representing beginning of cycle conditions). Parameters investigated include: material (composition, heat treatment (mill annealed or thermally treated), carbide distribution, yield strength, grain size, etc.), environmental (hydrogen content, boron–lithium–pH, zinc) and experimental environment control techniques. Although the PWSCC mechanism has yet to be fully explained, these studies provide an overview of important parameters for crack initiation. The present review aims to survey the evidence for PWSCC initiation in nickel base alloys. It is concluded that, within the normal range for operating PWRs, the influence of dissolved hydrogen on initiation is small. However, a weak maximum in crack growth rate is observed at 15–25 ml H₂/kg H₂O; a corresponding minimum in crack initiation time has not been confirmed but cannot be excluded. It is concluded that hydrogen must be reduced to well below 10 ml H₂/kg H₂O to achieve significant benefits. Increasing the Li content from 2–2·5 to 3·5 ppm is shown to reduce crack initiation time by 30–50%. Lithium in the range 2·2–7·5 ppm has little effect on crack growth rate at ～1200 ppm B. Boron appears to have little influence on crack initiation or growth.     

交联生产线悬链中点指示仪指示故障的分析

在诺基亚悬链式 3层共挤交联生产线中 ,悬链中点信号检测与信号发送装置是起着实时检测悬链中点 ,以及对 3#牵引装置进行速度调整的关键作用。该文就一例悬链中点指示仪指示异常的现象的检修作些分析 ,供同行参考。