Fully coupled, hygro-thermo-mechanical sensitivity analysis of a pre-stressed concrete pressure vessel
Fully coupled, hygro-thermo-mechanical sensitivity analysis of a pre-stressed concrete pressure vessel
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DOI：
10.1016/j.engstruct.2013.10.033
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发表时间：
2014-02-01
影响因子：
5.5
通讯作者：
Bicanic, N.
中科院分区：
文献类型：
--
作者：
Davie, C. T.;Pearce, C. J.;Bicanic, N.
鉴于最近世界各地重新燃起建造和运营核电站的愿望，以应对不断增长的能源需求和减少碳排放的全球计划，并鉴于最近发生的事件，如日本福岛第一核电站的事件，引起了安全问题，本文研究了核电站混凝土结构的长期性能，以典型的预应力混凝土压力容器（PCPV）为例，考虑了与目前在英国运行的几个电厂大致相似的情况，并对现有电厂超出其原计划运行寿命的延长运行进行了调查，并就新建厂房的建设，已进行了广泛的分析，使用一个完全耦合的湿热力学（HTM）模型的混凝土。最初进行的分析是为了确定典型PCPV运行33年以上后的当前状态。然后进行参数和敏感性研究，以确定某些影响，不太好的混凝土材料特性（孔隙率，含水量，渗透性和导热性）。进一步的研究调查了运行条件变化的影响，包括计划内和计划外的热事件，以及证明HTM模型在分析此类问题时的能力和实用性，已经表明，对这些安全性的长期行为的理解-关键结构对材料特性和载荷条件变化的响应是极其重要的，进一步的详细分析应结果表明，操作程序的变化只会导致结构在其使用寿命期间的行为发生微小变化，但意外的热偏移，如在福岛第一核电站发生的热偏移，可能会对混凝土结构产生更重大的影响。(C)2013作者由爱思唯尔有限公司出版。保留所有权利。
Following a recent world wide resurgence in the desire to build and operate nuclear power stations as a response to rising energy demands and global plans to reduce carbon emissions, and in the light of recent events such as those at the Fukushima Dai-ichi nuclear power plant in Japan, which have raised questions of safety, this work has investigated the long term behaviour of concrete nuclear power plant structures.A case example of a typical pre-stressed concrete pressure vessel (PCPV), generically similar to several presently in operation in the UK was considered and investigations were made with regard to the extended operation of existing plants beyond their originally planned for operational life spans, and with regard to the construction of new build plants.Extensive analyses have been carried out using a fully coupled hygro-thermo-mechanical (HTM) model for concrete. Analyses were initially conducted to determine the current state of a typical PCPV after 33+ years of operation. Parametric and sensitivity studies were then carried out to determine the influence of certain, less well characterised concrete material properties (porosity, moisture content, permeability and thermal conductivity). Further studies investigated the effects of changes to operational conditions including planned and unplanned thermal events.As well as demonstrating the capabilities and usefulness of the HTM model in the analysis of such problems, it has been shown that an understanding of the long-term behaviour of these safety-critical structures in response to variations in material properties and loading conditions is extremely important and that further detailed analysis should be conducted in order to provide a rational assessment for life extension.It was shown that changes to the operating procedures led to only minor changes in the behaviour of the structure over its life time, but that unplanned thermal excursions, like those seen at the Fukushima Dai-ichi plant could have more significant effects on the concrete structures. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.