Safety assessment of A92 reactor building for large commercial aircraft crash
Safety assessment of A92 reactor building for large commercial aircraft crash
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DOI：
10.1016/j.nucengdes.2013.08.038
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发表时间：
2014-04-01
影响因子：
1.7
通讯作者：
Andonov, A.
中科院分区：
文献类型：
--
作者：
Kostov, M.;Henkel, F. O.;Andonov, A.
本文介绍了对大型飞机与保加利亚贝莱尼核电站反应堆建筑物相撞所造成的影响进行综合分析的关键要素。反应堆厂房为VVER A92；它属于第三代以上，标准设计包括防止飞机撞击的结构措施。 A92反应堆建筑采用双壳概念，由厚实的钢筋混凝土外墙和围绕内部预应力安全壳的外壳和辅助建筑的内墙组成。大型飞机的恶意撞击被视为超出设计基础的事故（设计扩展条件，DEC）。考虑的主要问题是结构完整性、诱发振动导致的设备安全以及整个装置的消防安全。根据不同的冲击位置和载荷强度对许多冲击场景进行了分析。大量的非线性动力学分析用于评估结构响应和能力，包括不同类型的结构模型、不同的有限元规范和不同的材料定律。相应的冲击载荷由根据三种不同方法计算的载荷时间函数来表示，即通过Riera方法确定的载荷（Riera，1968）、通过有限元分析计算的载荷时间函数（Henkel和Klein，2007）以及目标与弹丸之间动态相互作用的耦合动态分析。根据数值结果和工程评估，评估了 A92 反应堆建筑抵抗大型飞机恶意撞击的能力。通过使用基于损坏指示参数的评估程序，在设备的安全评估上花费了大量的精力。这些分析的结果是对结构元件进行了一些设计修改。大部分外围防护结构改变了配筋布局、特殊布置和空间配筋以增加抗剪力，并增加了抗弯配筋，对设备稳定性提出了重要要求；调整了被动安全系统的部分要求，改进了设备的空间布置。所有调查的情况都表明，有足够的余地来防止严重事故的发生。 (C) 2013 Elsevier B.V. 保留所有权利。
The current paper presents key elements of the comprehensive analyses of the effects due to a large aircraft collision with the reactor building of Belene NPP in Bulgaria. The reactor building is a VVER A92; it belongs to the third+ generation and includes structural measures for protection against an aircraft impact as standard design. The A92 reactor building implements a double shell concept and is composed of thick RC external walls and an external shell which surrounds an internal pre-stressed containment and the internal walls of the auxiliary building. The malevolent large aircraft impact is considered as a beyond design base accident (Design Extended Conditions, DEC). The main issues under consideration are the structural integrity, the equipment safety due to the induced vibrations, and the fire safety of the entire installation.Many impact scenarios are analyzed varying both impact locations and loading intensity. A large number of non-linear dynamic analyses are used for assessment of the structural response and capacity, including different type of structural models, different finite element codes, and different material laws. The corresponding impact loadings are represented by load time functions calculated according to three different approaches, i.e. loading determined by Riera's method (Riera, 1968), load time function calculated by finite element analysis (Henkel and Klein, 2007), and coupled dynamic analysis with dynamic interaction between target and projectile. Based on the numerical results and engineering assessments the capacity of the A92 reactor building to resist a malevolent impact of a large aircraft is evaluated. Significant efforts are spent on safety assessment of equipment by using an evaluation procedure based on damage indicating parameters.As a result of these analyses several design modifications of structure elements are performed. There are changes of the layout of reinforcement, special arrangements and spatial reinforcement to increase shear resistance, as well as increase of the flexure reinforcement in most of the external protective structures.Significant requirements are formulated regarding the equipment stability; some requirements for the passive safety systems are adjusted and spatial arrangement of equipment are improved. All the investigated scenarios show that there are sufficient margins to prevent a severe accident. (C) 2013 Elsevier B.V. All rights reserved.