Abstract
After the Fukushima nuclear accident, the reliability requirements for Nuclear Power Plant (NPP) safety systems have been further improved worldwide. Therefore, it is necessary to provide a safe, reliable and economical scheme of the power supply system to cope with the abnormal conditions. Based on the reliability of the power supply of the 3rd generations of NPPs and combined with the application of the defend in depth concept in the electrical system, this paper provides a brief introduction of the typical 3rd generation NPP electrical system in the following area: the configuration of the electrical power system, defence in depth principle of the power supply, the basic structure of electrical power system. On this basis, an optimal power supply scheme is proposed.
Highlights
Nuclear power plant (NPP) is an important way to achieve low-carbon power generation and it is a green energy source
The 3rd generation NPPs usually rely on switching standby power supply, emergency diesel generators (EDG), SBO diesel generators, short-term battery(such as 2 hours), long-term battery(such as 12, 24 or more hours) and mobile diesel generators to provide power to NPPs in abnormal conditions, thereby improving the safety and reliability of NPPs
Configuration of the electrical power system In 3rd generation NPPs, according to the different technical routes, there are different numbers of the safety trains and different measures to cope with the Design Extension Condition (DEC) condition
Summary
Nuclear power plant (NPP) is an important way to achieve low-carbon power generation and it is a green energy source. The power supply sources are necessary for safety systems and equipment of NPPs and play an important role in performing their safety functions during normal operating conditions, accident conditions and after accident conditions. It is necessary to provide a safe, reliable and economical scheme of the power supply system to cope with the abnormal conditions [3, 4]. The 3rd generation NPPs usually rely on switching standby power supply, emergency diesel generators (EDG), SBO diesel generators, short-term battery(such as 2 hours), long-term battery(such as 12, 24 or more hours) and mobile diesel generators to provide power to NPPs in abnormal conditions, thereby improving the safety and reliability of NPPs. diesel generators and batteries have some shortcomings such as high idleness ratio, high cost of maintenance, high cost of regular test, high cost of qualification and high cost of the manufacture. An optimal power supply scheme is necessary to be proposed
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