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Mitigation of Diesel Generator Vibrations in Nuclear Applications

| 2018:544 | Antti Kangasperko
Diesel generator sets are found in all Nordic nuclear power plants for emergency back-up power production and are an important part of the plant safety system. In order to minimize the risk for vibration problems, it is vital to have an understanding of what type of problems may occur for different parts of the diesel generator and how it may affect the surrounding components.
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Emergency diesel generators are vital safety functions of a nuclear power plant as they provide electricity for critical process functions such as reactor cooling during power cuts. Vibration problems are not uncommon in these complex sets of machinery driven by powerful diesel engines and failure of components and other malfunctions have been relatively frequently reported.

In this thesis report, the vibration characteristics of diesel engines, generators and relevant rotating machine elements are described with a practical approach. Detection, Investigation, Analysis and Mitigation, DIAM matrices have been developed for diesel generators. The developed DIAM-matrices make solving emergency diesel generator vibration problems faster and easier and benefit especially users who are less experienced with these problems.