Category Archives: Materials’ ageing and degradation in. light water reactors

Materials management strategies for VVER reactors

T. J. KATONA, MVM Paks Nuclear Power Plant Ltd, Hungary DOI: 10.1533/9780857097453.3.335 Abstract: The strategic goal of the VVER operator is to extend its operational lifetime beyond the design life. Here, technical and regulatory conditions and methods for ensuring long-term operation of the VVER plant are presented plus an overview of the basic technical design features of VVER relevant to […]

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Maintenance programmes

Maintenance is the subject of Maintenance Effectiveness Monitoring (MEM), the purpose of which is to control the effectiveness of maintenance on SSCs ensuring they are capable of performing their intended functions. This means ensuring that safety-related SSCs are capable of performing their intended functions; that failures of certain non-safety-related SSCs that could affect safety-related functions will not occur; and failures […]

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Creep of RPV and internals

For RPV steels which undergo a damage of about 0.1 dpa, deterioration due to irradiation creep is much less in comparison to toughness loss. But creep crack growth studies indicate that the HAZ, with a different micro­structure and coarser grain size than the base metal, can lead to lower life after prolonged neutron exposure in the temperature range 320-420°C.101 Many […]

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Other nuclear reactor systems

The remainder of the nuclear plant is similar to any other power plant whether the steam is generated using coal, oil, natural gas or nuclear fuel. There will be issues with cooling tower decay, turbine corrosion, generator moisture, condenser corrosion, buried piping, etc. There are some issues that will be unique to nuclear power generation, however. For instance, decay of […]

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Corrosion-related problems

Corrosion is a major concern for reactor structures because in their con­struction many different materials are used which corrode at different rates by electrochemical effect and the corrosion (pitting, cracking, etc.) is accel­erated by neutron radiation. More importantly, the corrosion products from steam generators, piping and other components are transported through the core and deposit on the fuel rods leading […]

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