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秦山核电站二期扩建工程是我国自行设计、建造的压水堆核电站.在工程建造阶段,根据各子项、系统不同的质量等级,对所涉及的焊接方法和焊接质量提出了不同的质量要求,对常规岛设备以及管道系统的焊接质量要求中,以凝汽器钛管焊接技术难度大、质量要求高.本文通过常规岛凝汽器钛管焊接过程中的质量控制,介绍了凝汽器钛管焊接各工序的难点及质... 相似文献
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采用失重法和模拟腐蚀试验研究了溶解氧含量及联氨与溶解氧含量比值对压水堆核电厂二回路系统材料流动加速腐蚀(FAC)的影响,并结合经验反馈,给出了二回路系统溶解氧含量的控制策略。结果表明:在0~30μg/kg溶解氧范围内,溶解氧含量对凝结水管道材料A515碳钢均匀腐蚀的影响不大,低压加热器至除氧器之间的管道材料P11低合金钢的FAC速率随溶解氧含量的升高而减小;由于溶解氧含量较低,联氨与溶解氧含量比值超过了8,因此联氨含量的提高对该钢腐蚀速率的影响较小;在2 mg/kg的低溶解氧条件下,690TT合金的裂纹扩展速率(CGR)较低,在饱和溶解氧条件下,690TT合金的CGR提高了1.08~3.53倍;建议采取分段控制的方式控制压水堆核电厂二回路系统的溶解氧含量,将凝结水至除氧器之间的溶解氧质量分数提高至5~30μg/kg,将除氧器至蒸汽发生器之间的溶解氧质量分数控制在5μg/kg以下,并加入联氨,使联氨与溶解氧含量比值维持在5~8以上。 相似文献
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《机械制造文摘:焊接分册》2010,(5):45-46
燃气用PE管道焊接与监检注意要点/程浩…//广西轻工业.-2010(12):24-25
系统介绍了燃气用PE管的焊接工艺、热熔焊的质量控制要点和监检过程中的主要注意事项。燃气用PE管大多采用热熔对接连接,分别阐述了温度、压力、时间、接头质量等影响其质量的主要因素,并从施工验收规范、材料验收、焊接及焊接检验、管道敷设、试验与验收等方面介绍了燃气用聚乙烯PE管道安装监督检验应注意的问题。 相似文献
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给水管道在使用过程中很容易受到人为外力、管道材质、地下水、周围空气、土壤等因素的影响而腐蚀,影响了管道的使用质量和寿命,也带来较大的安全隐患。本文主要是从给水管道腐蚀原因出发,并探讨防护措施。 相似文献
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CNP650型压水堆的主管道作为反应堆压力容器堆芯冷却剂的通道,是连接反应堆压力容器、主泵和蒸汽发生器的大型厚壁承压管道。主管道焊接施工是核岛主设备安装的关键路径,是核电建设的重点与难点。焊接工艺评定所提供的数据与焊接经验,对确保主管道焊接施工一次成功,起着非常重要的作用。秦山核电二期扩建工程CNP650型核电站主管道手工焊接工艺评定从模拟现场焊接施工的条件、焊接过程管理、理化试验、焊接变形等方面进行控制,以获得符合技术规范对熔敷金属无损检测、理化性能的要求。焊接工艺评定过程控制为主管道焊接施工提供先决条件。 相似文献
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The materials used for the pressure‐retaining parts of reactor coolant system components in light water reactor nuclear power plants have to meet special requirements in terms of their mechanical properties, workability and in‐service performance. Corrosion issues play an important role in connection with plant operating conditions. While giving consideration to the specific service environment of the reactor whether a pressurized or boiling water reactor – the materials used for the individual components and the water chemistries employed in the various systems are selected such that metal loss due to general corrosion will remain very low. Thus the materials used in light water reactor plants exhibit a high general resistance to corrosion for their specified service conditions, material conditions and mechanical loads. However, under certain operating conditions other corrosion mechanisms may be found to induce damage. This paper uses data from the literature, published results of national and international research programs, information on damage which has actually occurred world‐wide and experience gained by Framatome ANP GmbH (former Siemens/KWU) in this field as a basis for discussing these mostly localised corrosion phenomena in terms of “classical” corrosion systems. Aspects associated with irradiation and its effects are not considered. Suitable remedial actions are, however, addressed wherever these are of relevance. The materials considered comprise unalloyed and low‐alloy steels, austenitic chromium‐nickel steels as well as high‐nickel steels and nickel‐base alloys which are exposed to the reactor coolant environment of boiling water reactor or pressurized water reactor plants, including materials investigated in corresponding water environments simulated in the laboratory. 相似文献
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论述了核电站反应堆冷却剂系统波动管的安装、焊接技术,详细阐述了波动管安装前的方案、焊接工艺评定等的准备工作要求,安装工序和具体实施过程及要点,焊接技术要求和焊接参数控制,焊接质量检验方法以及焊接变形的控制等,并对波动管焊接工作的重点进行了经验总结和反馈,对后续核电站反应堆冷却剂系统波动管的安装焊接及质量控制具有借鉴作用... 相似文献
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以百万千瓦级核电站冷却剂主管道90°弯头铸件的监造实践为例,针对大件铸造的特点,分析在监造过程中应注意的问题,以及如何通过对铸造弯头进行事前及过程的质量控制。获得了满足设计要求的合格产品。 相似文献
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Generation-IV reactor design concepts envisioned thus far cater to a common goal of providing safer, longer lasting, proliferation-resistant,
and economically viable nuclear power plants. The foremost consideration in the successful development and deployment of Gen-W
reactor systems is the performance and reliability issues involving structural materials for both in-core and out-of-core
applications. The structural materials need to endure much higher temperatures, higher neutron doses, and extremely corrosive
environments, which are beyond the experience of the current nuclear power plants. Materials under active consideration for
use in different reactor components include various ferritic/martensitic steels, austenitic stainless steels, nickel-base
superalloys, ceramics, composites, etc. This article addresses the material requirements for these advanced fission reactor
types, specifically addressing structural materials issues depending on the specific application areas. 相似文献
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The effect of thermal aging in the range of 250–400°C on the critical brittle point of pearlitic steels for nuclear power
plant reactor vessels is studied. The structural mechanisms of the embrittlement of the steels are investigated by determining
the activation energy. Methods are suggested for predicting the shift of the critical brittle point due to thermal aging of
vessel steels for determining the design service life of nuclear power plants of a new generation.
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Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 7, pp. 23–27, July, 2006. 相似文献