Category Archives: Frequency Response Testing. in Nuclear Reactors

Stability Assessment

Special tests will not be required to determine whether a system is stable. Unstable behavior will be unpleasantly apparent without testing, but measurements will be required to assess the stability reserve of stable systems. Furthermore, prudent operators of reactor systems should prize quantitative information on changes in the stability reserve with changing system characteristics. Examples of system characteristics that will […]

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Descriptions of Typical Control-Rod Drive Mechanisms

(a) Magnetic Jack This CRDM is used widely in pressurized-water reactors. The magnetic jack has the advantage that it does not require mechanical or electrical penetrations of the reactor pressure boundary. Electrical coils around the CRDM housing are capable of supplying magnetic forces that can engage appropriate latches and can lift or drop the control rod between stops. The motion […]

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Mathematical Background

Even though this book deals with experimental measurements, it is neces­sary to consider some mathematical questions. First, it is essential to examine briefly the methods used for theoretical analysis of dynamic systems so that the significance of test results will be appreciated. It is also necessary to study Fourier analysis and related topics as a background for later discus­sions on […]

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Heavy-Water Reactors t

The experiences with frequency response testing on heavy-water reactors have been at the NPD and NRU reactors in Canada, the Agesta reactor in Sweden, and the Halden reactor in Norway. Each of these countries has devoted considerable effort to development of practical testing procedures. The experiences with all heavy-water reactors have been combined in this section, but the reactor characteristics […]

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System Identificationf

The term system identification has been used to describe a number of things, including the measurement of the system frequency response. However, we will use it here to describe procedures for extracting useful information on system models or parameters from experimental data. Different levels of system identification may be applied to test data. The different levels vary in complexity and […]

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