Brittle Fracture Resistance of the Reflection Shield of a WWER-1000 Reactorunder Normal Operating and Emergency Conditions

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Strength of Materials Pub Date : 2024-02-28 DOI:10.1007/s11223-024-00602-2
O. V. Makhnenko, S. M. Kandala
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Abstract

To date, most WWER-1000 nuclear power units in Ukraine have reached the end of their design life (30 years). In view of this, work is under way to extend the service life of critical equipment elements beyond the design life (to up to 60 years). In addition to reactor vessels, these critical elements include vessel internals (VI). One of the key approaches in such works is a predictive assessment of the structural integrity of VI structures using mathematical modeling of physical processes typical for power unit operation under intense radiation exposure of structural material. The service life prediction methodology constantly requires refining and taking into account more factors affecting structural integrity. The paper considers the kinetics of changes in the stress intensity factor for postulated cracks in the reflection shield of WWER-1000 VIs during long-term operation and at the time of reactor emergency during the rupture of primary coolant circuit pipelines with a nominal diameter of 100 to 850 mm in the most dangerous areas in terms of brittle fracture resistance. A significant impact of taking into account the residual stresses formed as a result of welding and heat treatment of the reflection shield during manufacturing on the results of calculating the brittle fracture resistance was revealed, which may affect the conservatism of assessment methods when justifying long-term operation.

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WWER-1000 反应堆反射罩在正常运行和紧急状态下的抗脆性断裂性能
迄今为止,乌克兰的大多数 WWER-1000 核电机组都已达到设计寿命(30 年)。有鉴于此,目前正在努力延长关键设备元件的使用寿命,使其超过设计寿命(长达 60 年)。除反应堆容器外,这些关键部件还包括容器内件(VI)。这些工作的主要方法之一是利用数学模型对结构材料在强辐射照射下的典型动力装置运行物理过程进行预测,从而对 VI 结构的结构完整性进行评估。使用寿命预测方法需要不断完善,并考虑更多影响结构完整性的因素。本文研究了 WWER-1000 六代核反应堆在长期运行过程中,以及在反应堆紧急状态下,公称直径为 100 至 850 毫米的一次冷却剂回路管道在脆性断裂抗力最危险的区域破裂时,反射罩上假定裂纹的应力强度因子的变化动力学。考虑到制造过程中反射罩焊接和热处理形成的残余应力对计算抗脆性断裂能力的结果有重大影响,这可能会影响评估方法在证明长期运行合理性时的保守性。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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