Session: 01-05: Nuclear Plant Operation, Modification, Life Extension, Maintenance and Life Cycle - V

Paper Number: 135047

135047 - Research Methods and Protective Measures for Internal Flooding Analysis of Nuclear Islands 

Abstract: 

Internal flooding of nuclear power plant nuclear islands is a common mode failure of systems and equipment, and is one of the common internal disasters in nuclear power plants. The flooding effect of internal flooding can cause the failure of safety related equipment, thereby preventing it from performing its safety functions. To ensure that nuclear power plants can still maintain their safety functions in the event of internal flooding, the design must consider this potential hazard, and the protection design for this hazard should ensure the realization of various safety functions of the power plant system. This article is based on the analysis and research of internal water flooding in the nuclear island of HPR1000 nuclear power plant, following the standards and regulatory requirements of advanced pressurized water reactors, and drawing on the experience of nuclear power plant engineering design, to study the research methods and protective measures of internal water flooding analysis in the nuclear island. Firstly, determine the background and evaluation criteria for the internal flood protection design of nuclear power plants, compare the recommended flood hazard evaluation methods in the standards, and then analyze in detail the steps and processes of internal flood source screening. Analyze the spread path and water level calculation method of the water source, and conduct risk analysis on the protective equipment within the zone. Then, determine the protective measures and provide analysis results for the safety objectives of nuclear power plants. Through extensive research and analysis of internal water flooding research technology in nuclear power plants both domestically and internationally, a deterministic method for analyzing internal water flooding in nuclear islands has been developed. The impact of water flooding on items performing safety functions in various plant buildings within the nuclear island has been analyzed, and corresponding protective measures have been developed. The internal water flooding analysis of the nuclear island building mainly focuses on the water flooding event of a single water source under normal operating conditions of the nuclear power plant. The design of HPR1000 mainly focuses on the water flooding analysis of the nuclear island building under normal operating conditions of the nuclear power plant. Through analysis and research, the internal water flooding protection design of the HPR1000 nuclear island has been verified and improved, further demonstrating the rationality of this analysis method, laying a solid technical foundation for the research of third-generation nuclear power technology in China's HPR1000, and providing reference and guidance for the internal water flooding analysis of subsequent projects.

Presenting Author: Guang Du China Nuclear Power Engineering Co.,Ltd.

Presenting Author Biography: I am a senior engineer, in charge of nuclear reactor process system, equipment and layout design, including engineering safety system, nuclear auxiliary system, severe accident mitigation system and steam generator secondary side system, and its associated equipment and arrangement.

Authors:

Guang Du China Nuclear Power Engineering Co.,Ltd.
Danfeng Zhao China Nuclear Power Engineering Co.,Ltd.
Daping Lin China Nuclear Power Engineering Co.,Ltd.
Xiaoxia Chen China Nuclear Power Engineering Co.,Ltd.