The existing nuclear piping damping data base is examined to assess the relation between frequency and damping in the seismic range (0 to 33 Hz). A conclusion is reached that the published data supports such a correlation for individual systems, and that this relation offers suitable advantages for use in establishing allowable damping values for seismic analyses. The data base for higher frequency systems subjected to flow-induced loads is presently very meager, and thus a corresponding assessment cannot be made.

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